/*- * Copyright (c) 1982, 1986, 1990, 1991, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Copyright (c) 2002 Networks Associates Technologies, Inc. * All rights reserved. * * Portions of this software were developed for the FreeBSD Project by * ThinkSec AS and NAI Labs, the Security Research Division of Network * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 * ("CBOSS"), as part of the DARPA CHATS research program. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)tty.c 8.8 (Berkeley) 1/21/94 */ /*- * TODO: * o Fix races for sending the start char in ttyflush(). * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect(). * With luck, there will be MIN chars before select() returns(). * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it. * o Don't allow input in TS_ZOMBIE case. It would be visible through * FIONREAD. * o Do the new sio locking stuff here and use it to avoid special * case for EXTPROC? * o Lock PENDIN too? * o Move EXTPROC and/or PENDIN to t_state? * o Wrap most of ttioctl in spltty/splx. * o Implement TIOCNOTTY or remove it from . * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set. * o Don't allow certain termios flags to affect disciplines other * than TTYDISC. Cancel their effects before switch disciplines * and ignore them if they are set while we are in another * discipline. * o Now that historical speed conversions are handled here, don't * do them in drivers. * o Check for TS_CARR_ON being set while everything is closed and not * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open, * so it would live until the next open even if carrier drops. * o Restore TS_WOPEN since it is useful in pstat. It must be cleared * only when _all_ openers leave open(). */ #include __FBSDID("$FreeBSD$"); #include "opt_compat.h" #include "opt_tty.h" #include #include #include #include #include #include #include #ifndef BURN_BRIDGES #if defined(COMPAT_43) #include #endif #endif #include #define TTYDEFCHARS #include #undef TTYDEFCHARS #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures"); long tk_cancc; long tk_nin; long tk_nout; long tk_rawcc; static d_open_t ttysopen; static d_close_t ttysclose; static d_read_t ttysrdwr; static d_ioctl_t ttysioctl; static d_purge_t ttypurge; /* Default cdevsw for common tty devices */ static struct cdevsw tty_cdevsw = { .d_version = D_VERSION, .d_open = ttyopen, .d_close = ttyclose, .d_ioctl = ttyioctl, .d_purge = ttypurge, .d_name = "ttydrv", .d_flags = D_TTY | D_NEEDGIANT, }; /* Cdevsw for slave tty devices */ static struct cdevsw ttys_cdevsw = { .d_version = D_VERSION, .d_open = ttysopen, .d_close = ttysclose, .d_read = ttysrdwr, .d_write = ttysrdwr, .d_ioctl = ttysioctl, .d_name = "TTYS", .d_flags = D_TTY | D_NEEDGIANT, }; static int proc_compare(struct proc *p1, struct proc *p2); static int ttnread(struct tty *tp); static void ttyecho(int c, struct tty *tp); static int ttyoutput(int c, struct tty *tp); static void ttypend(struct tty *tp); static void ttyretype(struct tty *tp); static void ttyrub(int c, struct tty *tp); static void ttyrubo(struct tty *tp, int cnt); static void ttyunblock(struct tty *tp); static int ttywflush(struct tty *tp); static int filt_ttyread(struct knote *kn, long hint); static void filt_ttyrdetach(struct knote *kn); static int filt_ttywrite(struct knote *kn, long hint); static void filt_ttywdetach(struct knote *kn); /* * Table with character classes and parity. The 8th bit indicates parity, * the 7th bit indicates the character is an alphameric or underscore (for * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits * are 0 then the character needs no special processing on output; classes * other than 0 might be translated or (not currently) require delays. */ #define E 0x00 /* Even parity. */ #define O 0x80 /* Odd parity. */ #define PARITY(c) (char_type[c] & O) #define ALPHA 0x40 /* Alpha or underscore. */ #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) #define CCLASSMASK 0x3f #define CCLASS(c) (char_type[c] & CCLASSMASK) #define BS BACKSPACE #define CC CONTROL #define CR RETURN #define NA ORDINARY | ALPHA #define NL NEWLINE #define NO ORDINARY #define TB TAB #define VT VTAB static u_char const char_type[] = { E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ /* * Meta chars; should be settable per character set; * for now, treat them all as normal characters. */ NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, }; #undef BS #undef CC #undef CR #undef NA #undef NL #undef NO #undef TB #undef VT /* Macros to clear/set/test flags. */ #define SET(t, f) (t) |= (f) #define CLR(t, f) (t) &= ~(f) #define ISSET(t, f) ((t) & (f)) #undef MAX_INPUT /* XXX wrong in */ #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */ /* * list of struct tty where pstat(8) can pick it up with sysctl * * The lock order is to grab the list mutex before the tty mutex. * Together with additions going on the tail of the list, this allows * the sysctl to avoid doing retries. */ static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list); static struct mtx tty_list_mutex; static struct unrhdr *tty_unit; static int drainwait = 5*60; SYSCTL_INT(_kern, OID_AUTO, drainwait, CTLFLAG_RW, &drainwait, 0, "Output drain timeout in seconds"); static struct tty * tty_gettp(struct cdev *dev) { struct tty *tp; struct cdevsw *csw; csw = dev_refthread(dev); KASSERT(csw != NULL, ("No cdevsw in ttycode (%s)", devtoname(dev))); KASSERT(csw->d_flags & D_TTY, ("non D_TTY (%s) in tty code", devtoname(dev))); dev_relthread(dev); tp = dev->si_tty; KASSERT(tp != NULL, ("no tty pointer on (%s) in tty code", devtoname(dev))); return (tp); } /* * Initial open of tty, or (re)entry to standard tty line discipline. */ int tty_open(struct cdev *device, struct tty *tp) { int s; s = spltty(); tp->t_dev = device; tp->t_hotchar = 0; if (!ISSET(tp->t_state, TS_ISOPEN)) { ttyref(tp); SET(tp->t_state, TS_ISOPEN); if (ISSET(tp->t_cflag, CLOCAL)) SET(tp->t_state, TS_CONNECTED); bzero(&tp->t_winsize, sizeof(tp->t_winsize)); } /* XXX don't hang forever on output */ if (tp->t_timeout < 0) tp->t_timeout = drainwait*hz; ttsetwater(tp); splx(s); return (0); } /* * Handle close() on a tty line: flush and set to initial state, * bumping generation number so that pending read/write calls * can detect recycling of the tty. * XXX our caller should have done `spltty(); l_close(); tty_close();' * and l_close() should have flushed, but we repeat the spltty() and * the flush in case there are buggy callers. */ int tty_close(struct tty *tp) { int s; funsetown(&tp->t_sigio); s = spltty(); if (constty == tp) constty_clear(); ttyflush(tp, FREAD | FWRITE); clist_free_cblocks(&tp->t_canq); clist_free_cblocks(&tp->t_outq); clist_free_cblocks(&tp->t_rawq); tp->t_gen++; tp->t_line = TTYDISC; tp->t_hotchar = 0; tp->t_pgrp = NULL; tp->t_session = NULL; tp->t_state = 0; knlist_clear(&tp->t_rsel.si_note, 0); knlist_clear(&tp->t_wsel.si_note, 0); ttyrel(tp); splx(s); return (0); } #define FLUSHQ(q) { \ if ((q)->c_cc) \ ndflush(q, (q)->c_cc); \ } /* Is 'c' a line delimiter ("break" character)? */ #define TTBREAKC(c, lflag) \ ((c) == '\n' || (((c) == cc[VEOF] || \ (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \ (c) != _POSIX_VDISABLE)) /* * Process input of a single character received on a tty. */ int ttyinput(int c, struct tty *tp) { tcflag_t iflag, lflag; cc_t *cc; int i, err; /* * If input is pending take it first. */ lflag = tp->t_lflag; if (ISSET(lflag, PENDIN)) ttypend(tp); /* * Gather stats. */ if (ISSET(lflag, ICANON)) { ++tk_cancc; ++tp->t_cancc; } else { ++tk_rawcc; ++tp->t_rawcc; } ++tk_nin; /* * Block further input iff: * current input > threshold AND input is available to user program * AND input flow control is enabled and not yet invoked. * The 3 is slop for PARMRK. */ iflag = tp->t_iflag; if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 && (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) && (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) && !ISSET(tp->t_state, TS_TBLOCK)) ttyblock(tp); /* Handle exceptional conditions (break, parity, framing). */ cc = tp->t_cc; err = (ISSET(c, TTY_ERRORMASK)); if (err) { CLR(c, TTY_ERRORMASK); if (ISSET(err, TTY_BI)) { if (ISSET(iflag, IGNBRK)) return (0); if (ISSET(iflag, BRKINT)) { ttyflush(tp, FREAD | FWRITE); if (tp->t_pgrp != NULL) { PGRP_LOCK(tp->t_pgrp); pgsignal(tp->t_pgrp, SIGINT, 1); PGRP_UNLOCK(tp->t_pgrp); } goto endcase; } if (ISSET(iflag, PARMRK)) goto parmrk; } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) || ISSET(err, TTY_FE)) { if (ISSET(iflag, IGNPAR)) return (0); else if (ISSET(iflag, PARMRK)) { parmrk: if (tp->t_rawq.c_cc + tp->t_canq.c_cc > MAX_INPUT - 3) goto input_overflow; (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); (void)putc(0 | TTY_QUOTE, &tp->t_rawq); (void)putc(c | TTY_QUOTE, &tp->t_rawq); goto endcase; } else c = 0; } } if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) CLR(c, 0x80); if (!ISSET(lflag, EXTPROC)) { /* * Check for literal nexting very first */ if (ISSET(tp->t_state, TS_LNCH)) { SET(c, TTY_QUOTE); CLR(tp->t_state, TS_LNCH); } /* * Scan for special characters. This code * is really just a big case statement with * non-constant cases. The bottom of the * case statement is labeled ``endcase'', so goto * it after a case match, or similar. */ /* * Control chars which aren't controlled * by ICANON, ISIG, or IXON. */ if (ISSET(lflag, IEXTEN)) { if (CCEQ(cc[VLNEXT], c)) { if (ISSET(lflag, ECHO)) { if (ISSET(lflag, ECHOE)) { (void)ttyoutput('^', tp); (void)ttyoutput('\b', tp); } else ttyecho(c, tp); } SET(tp->t_state, TS_LNCH); goto endcase; } if (CCEQ(cc[VDISCARD], c)) { if (ISSET(lflag, FLUSHO)) CLR(tp->t_lflag, FLUSHO); else { ttyflush(tp, FWRITE); ttyecho(c, tp); if (tp->t_rawq.c_cc + tp->t_canq.c_cc) ttyretype(tp); SET(tp->t_lflag, FLUSHO); } goto startoutput; } } /* * Signals. */ if (ISSET(lflag, ISIG)) { if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { if (!ISSET(lflag, NOFLSH)) ttyflush(tp, FREAD | FWRITE); ttyecho(c, tp); if (tp->t_pgrp != NULL) { PGRP_LOCK(tp->t_pgrp); pgsignal(tp->t_pgrp, CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); PGRP_UNLOCK(tp->t_pgrp); } goto endcase; } if (CCEQ(cc[VSUSP], c)) { if (!ISSET(lflag, NOFLSH)) ttyflush(tp, FREAD); ttyecho(c, tp); if (tp->t_pgrp != NULL) { PGRP_LOCK(tp->t_pgrp); pgsignal(tp->t_pgrp, SIGTSTP, 1); PGRP_UNLOCK(tp->t_pgrp); } goto endcase; } } /* * Handle start/stop characters. */ if (ISSET(iflag, IXON)) { if (CCEQ(cc[VSTOP], c)) { if (!ISSET(tp->t_state, TS_TTSTOP)) { SET(tp->t_state, TS_TTSTOP); (*tp->t_stop)(tp, 0); return (0); } if (!CCEQ(cc[VSTART], c)) return (0); /* * if VSTART == VSTOP then toggle */ goto endcase; } if (CCEQ(cc[VSTART], c)) goto restartoutput; } /* * IGNCR, ICRNL, & INLCR */ if (c == '\r') { if (ISSET(iflag, IGNCR)) return (0); else if (ISSET(iflag, ICRNL)) c = '\n'; } else if (c == '\n' && ISSET(iflag, INLCR)) c = '\r'; } if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { /* * From here on down canonical mode character * processing takes place. */ /* * erase or erase2 (^H / ^?) */ if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) { if (tp->t_rawq.c_cc) ttyrub(unputc(&tp->t_rawq), tp); goto endcase; } /* * kill (^U) */ if (CCEQ(cc[VKILL], c)) { if (ISSET(lflag, ECHOKE) && tp->t_rawq.c_cc == tp->t_rocount && !ISSET(lflag, ECHOPRT)) while (tp->t_rawq.c_cc) ttyrub(unputc(&tp->t_rawq), tp); else { ttyecho(c, tp); if (ISSET(lflag, ECHOK) || ISSET(lflag, ECHOKE)) ttyecho('\n', tp); FLUSHQ(&tp->t_rawq); tp->t_rocount = 0; } CLR(tp->t_state, TS_LOCAL); goto endcase; } /* * word erase (^W) */ if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) { int ctype; /* * erase whitespace */ while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t') ttyrub(c, tp); if (c == -1) goto endcase; /* * erase last char of word and remember the * next chars type (for ALTWERASE) */ ttyrub(c, tp); c = unputc(&tp->t_rawq); if (c == -1) goto endcase; if (c == ' ' || c == '\t') { (void)putc(c, &tp->t_rawq); goto endcase; } ctype = ISALPHA(c); /* * erase rest of word */ do { ttyrub(c, tp); c = unputc(&tp->t_rawq); if (c == -1) goto endcase; } while (c != ' ' && c != '\t' && (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype)); (void)putc(c, &tp->t_rawq); goto endcase; } /* * reprint line (^R) */ if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) { ttyretype(tp); goto endcase; } /* * ^T - kernel info and generate SIGINFO */ if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) { if (ISSET(lflag, ISIG) && tp->t_pgrp != NULL) { PGRP_LOCK(tp->t_pgrp); pgsignal(tp->t_pgrp, SIGINFO, 1); PGRP_UNLOCK(tp->t_pgrp); } if (!ISSET(lflag, NOKERNINFO)) ttyinfo(tp); goto endcase; } } /* * Check for input buffer overflow */ if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) { input_overflow: if (ISSET(iflag, IMAXBEL)) { if (tp->t_outq.c_cc < tp->t_ohiwat) (void)ttyoutput(CTRL('g'), tp); } goto endcase; } if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP) && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR)) (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); /* * Put data char in q for user and * wakeup on seeing a line delimiter. */ if (putc(c, &tp->t_rawq) >= 0) { if (!ISSET(lflag, ICANON)) { ttwakeup(tp); ttyecho(c, tp); goto endcase; } if (TTBREAKC(c, lflag)) { tp->t_rocount = 0; catq(&tp->t_rawq, &tp->t_canq); ttwakeup(tp); } else if (tp->t_rocount++ == 0) tp->t_rocol = tp->t_column; if (ISSET(tp->t_state, TS_ERASE)) { /* * end of prterase \.../ */ CLR(tp->t_state, TS_ERASE); (void)ttyoutput('/', tp); } i = tp->t_column; ttyecho(c, tp); if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { /* * Place the cursor over the '^' of the ^D. */ i = imin(2, tp->t_column - i); while (i > 0) { (void)ttyoutput('\b', tp); i--; } } } endcase: /* * IXANY means allow any character to restart output. */ if (ISSET(tp->t_state, TS_TTSTOP) && !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) return (0); restartoutput: CLR(tp->t_lflag, FLUSHO); CLR(tp->t_state, TS_TTSTOP); startoutput: return (ttstart(tp)); } /* * Output a single character on a tty, doing output processing * as needed (expanding tabs, newline processing, etc.). * Returns < 0 if succeeds, otherwise returns char to resend. * Must be recursive. */ static int ttyoutput(int c, struct tty *tp) { tcflag_t oflag; int col, s; oflag = tp->t_oflag; if (!ISSET(oflag, OPOST)) { if (ISSET(tp->t_lflag, FLUSHO)) return (-1); if (putc(c, &tp->t_outq)) return (c); tk_nout++; tp->t_outcc++; return (-1); } /* * Do tab expansion if OXTABS is set. Special case if we external * processing, we don't do the tab expansion because we'll probably * get it wrong. If tab expansion needs to be done, let it happen * externally. */ CLR(c, ~TTY_CHARMASK); if (c == '\t' && ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { c = 8 - (tp->t_column & 7); if (!ISSET(tp->t_lflag, FLUSHO)) { s = spltty(); /* Don't interrupt tabs. */ c -= b_to_q(" ", c, &tp->t_outq); tk_nout += c; tp->t_outcc += c; splx(s); } tp->t_column += c; return (c ? -1 : '\t'); } if (c == CEOT && ISSET(oflag, ONOEOT)) return (-1); /* * Newline translation: if ONLCR is set, * translate newline into "\r\n". */ if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { tk_nout++; tp->t_outcc++; if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq)) return (c); } /* If OCRNL is set, translate "\r" into "\n". */ else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) c = '\n'; /* If ONOCR is set, don't transmit CRs when on column 0. */ else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) return (-1); tk_nout++; tp->t_outcc++; if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) return (c); col = tp->t_column; switch (CCLASS(c)) { case BACKSPACE: if (col > 0) --col; break; case CONTROL: break; case NEWLINE: if (ISSET(tp->t_oflag, ONLCR | ONLRET)) col = 0; break; case RETURN: col = 0; break; case ORDINARY: ++col; break; case TAB: col = (col + 8) & ~7; break; } tp->t_column = col; return (-1); } /* * Ioctls for all tty devices. Called after line-discipline specific ioctl * has been called to do discipline-specific functions and/or reject any * of these ioctl commands. */ /* ARGSUSED */ int ttioctl(struct tty *tp, u_long cmd, void *data, int flag) { struct proc *p; struct thread *td; struct pgrp *pgrp; int s, error, bits, sig, sig2; td = curthread; /* XXX */ p = td->td_proc; /* If the ioctl involves modification, hang if in the background. */ switch (cmd) { case TIOCCBRK: case TIOCCONS: case TIOCDRAIN: case TIOCEXCL: case TIOCFLUSH: #ifdef TIOCHPCL case TIOCHPCL: #endif case TIOCNXCL: case TIOCSBRK: case TIOCSCTTY: case TIOCSDRAINWAIT: case TIOCSETA: case TIOCSETAF: case TIOCSETAW: case TIOCSETD: case TIOCSPGRP: case TIOCSTART: case TIOCSTAT: case TIOCSTI: case TIOCSTOP: case TIOCSWINSZ: #ifndef BURN_BRIDGES #if defined(COMPAT_43) case TIOCLBIC: case TIOCLBIS: case TIOCLSET: case TIOCSETC: case OTIOCSETD: case TIOCSETN: case TIOCSETP: case TIOCSLTC: #endif #endif sx_slock(&proctree_lock); PROC_LOCK(p); while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) && !SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTOU) && !SIGISMEMBER(td->td_sigmask, SIGTTOU)) { pgrp = p->p_pgrp; PROC_UNLOCK(p); if (pgrp->pg_jobc == 0) { sx_sunlock(&proctree_lock); return (EIO); } PGRP_LOCK(pgrp); sx_sunlock(&proctree_lock); pgsignal(pgrp, SIGTTOU, 1); PGRP_UNLOCK(pgrp); error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1", 0); if (error) return (error); sx_slock(&proctree_lock); PROC_LOCK(p); } PROC_UNLOCK(p); sx_sunlock(&proctree_lock); break; } if (tp->t_break != NULL) { switch (cmd) { case TIOCSBRK: tp->t_break(tp, 1); return (0); case TIOCCBRK: tp->t_break(tp, 0); return (0); default: break; } } if (tp->t_modem != NULL) { switch (cmd) { case TIOCSDTR: tp->t_modem(tp, SER_DTR, 0); return (0); case TIOCCDTR: tp->t_modem(tp, 0, SER_DTR); return (0); case TIOCMSET: bits = *(int *)data; sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; sig2 = ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1; tp->t_modem(tp, sig, sig2); return (0); case TIOCMBIS: bits = *(int *)data; sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; tp->t_modem(tp, sig, 0); return (0); case TIOCMBIC: bits = *(int *)data; sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; tp->t_modem(tp, 0, sig); return (0); case TIOCMGET: sig = tp->t_modem(tp, 0, 0); /* See t_state, TS_ASYNC); else CLR(tp->t_state, TS_ASYNC); splx(s); break; case FIONBIO: /* set/clear non-blocking i/o */ break; /* XXX: delete. */ case FIONREAD: /* get # bytes to read */ s = spltty(); *(int *)data = ttnread(tp); splx(s); break; case FIOSETOWN: /* * Policy -- Don't allow FIOSETOWN on someone else's * controlling tty */ if (tp->t_session != NULL && !isctty(p, tp)) return (ENOTTY); error = fsetown(*(int *)data, &tp->t_sigio); if (error) return (error); break; case FIOGETOWN: if (tp->t_session != NULL && !isctty(p, tp)) return (ENOTTY); *(int *)data = fgetown(&tp->t_sigio); break; case TIOCEXCL: /* set exclusive use of tty */ s = spltty(); SET(tp->t_state, TS_XCLUDE); splx(s); break; case TIOCFLUSH: { /* flush buffers */ int flags = *(int *)data; if (flags == 0) flags = FREAD | FWRITE; else flags &= FREAD | FWRITE; ttyflush(tp, flags); break; } case TIOCCONS: /* become virtual console */ if (*(int *)data) { struct nameidata nid; if (constty && constty != tp && ISSET(constty->t_state, TS_CONNECTED)) return (EBUSY); /* Ensure user can open the real console. */ NDINIT(&nid, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, "/dev/console", td); if ((error = namei(&nid)) != 0) return (error); NDFREE(&nid, NDF_ONLY_PNBUF); error = VOP_ACCESS(nid.ni_vp, VREAD, td->td_ucred, td); vput(nid.ni_vp); if (error) return (error); constty_set(tp); } else if (tp == constty) constty_clear(); break; case TIOCDRAIN: /* wait till output drained */ error = ttywait(tp); if (error) return (error); break; case TIOCGETA: { /* get termios struct */ struct termios *t = (struct termios *)data; bcopy(&tp->t_termios, t, sizeof(struct termios)); break; } case TIOCGETD: /* get line discipline */ *(int *)data = tp->t_line; break; case TIOCGWINSZ: /* get window size */ *(struct winsize *)data = tp->t_winsize; break; case TIOCGPGRP: /* get pgrp of tty */ if (!isctty(p, tp)) return (ENOTTY); *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; break; #ifdef TIOCHPCL case TIOCHPCL: /* hang up on last close */ s = spltty(); SET(tp->t_cflag, HUPCL); splx(s); break; #endif case TIOCMGDTRWAIT: *(int *)data = tp->t_dtr_wait * 100 / hz; break; case TIOCMSDTRWAIT: /* must be root since the wait applies to following logins */ error = suser(td); if (error) return (error); tp->t_dtr_wait = *(int *)data * hz / 100; break; case TIOCNXCL: /* reset exclusive use of tty */ s = spltty(); CLR(tp->t_state, TS_XCLUDE); splx(s); break; case TIOCOUTQ: /* output queue size */ *(int *)data = tp->t_outq.c_cc; break; case TIOCSETA: /* set termios struct */ case TIOCSETAW: /* drain output, set */ case TIOCSETAF: { /* drn out, fls in, set */ struct termios *t = (struct termios *)data; if (t->c_ispeed == 0) t->c_ispeed = t->c_ospeed; if (t->c_ispeed == 0) t->c_ispeed = tp->t_ospeed; if (t->c_ispeed == 0) return (EINVAL); s = spltty(); if (cmd == TIOCSETAW || cmd == TIOCSETAF) { error = ttywait(tp); if (error) { splx(s); return (error); } if (cmd == TIOCSETAF) ttyflush(tp, FREAD); } if (!ISSET(t->c_cflag, CIGNORE)) { /* * Set device hardware. */ if (tp->t_param && (error = (*tp->t_param)(tp, t))) { splx(s); return (error); } if (ISSET(t->c_cflag, CLOCAL) && !ISSET(tp->t_cflag, CLOCAL)) { /* * XXX disconnections would be too hard to * get rid of without this kludge. The only * way to get rid of controlling terminals * is to exit from the session leader. */ CLR(tp->t_state, TS_ZOMBIE); wakeup(TSA_CARR_ON(tp)); ttwakeup(tp); ttwwakeup(tp); } if ((ISSET(tp->t_state, TS_CARR_ON) || ISSET(t->c_cflag, CLOCAL)) && !ISSET(tp->t_state, TS_ZOMBIE)) SET(tp->t_state, TS_CONNECTED); else CLR(tp->t_state, TS_CONNECTED); tp->t_cflag = t->c_cflag; tp->t_ispeed = t->c_ispeed; if (t->c_ospeed != 0) tp->t_ospeed = t->c_ospeed; ttsetwater(tp); } if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) && cmd != TIOCSETAF) { if (ISSET(t->c_lflag, ICANON)) SET(tp->t_lflag, PENDIN); else { /* * XXX we really shouldn't allow toggling * ICANON while we're in a non-termios line * discipline. Now we have to worry about * panicing for a null queue. */ if (tp->t_canq.c_cbreserved > 0 && tp->t_rawq.c_cbreserved > 0) { catq(&tp->t_rawq, &tp->t_canq); /* * XXX the queue limits may be * different, so the old queue * swapping method no longer works. */ catq(&tp->t_canq, &tp->t_rawq); } CLR(tp->t_lflag, PENDIN); } ttwakeup(tp); } tp->t_iflag = t->c_iflag; tp->t_oflag = t->c_oflag; /* * Make the EXTPROC bit read only. */ if (ISSET(tp->t_lflag, EXTPROC)) SET(t->c_lflag, EXTPROC); else CLR(t->c_lflag, EXTPROC); tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); if (t->c_cc[VMIN] != tp->t_cc[VMIN] || t->c_cc[VTIME] != tp->t_cc[VTIME]) ttwakeup(tp); bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); splx(s); break; } case TIOCSETD: { /* set line discipline */ int t = *(int *)data; if ((u_int)t >= nlinesw) return (ENXIO); if (t == tp->t_line) return (0); s = spltty(); ttyld_close(tp, flag); tp->t_line = t; /* XXX: we should use the correct cdev here */ error = ttyld_open(tp, tp->t_dev); if (error) { /* * If we fail to switch line discipline we cannot * fall back to the previous, because we can not * trust that ldisc to open successfully either. * Fall back to the default ldisc which we know * will allways succeed. */ tp->t_line = TTYDISC; (void)ttyld_open(tp, tp->t_dev); } splx(s); return (error); break; } case TIOCSTART: /* start output, like ^Q */ s = spltty(); if (ISSET(tp->t_state, TS_TTSTOP) || ISSET(tp->t_lflag, FLUSHO)) { CLR(tp->t_lflag, FLUSHO); CLR(tp->t_state, TS_TTSTOP); ttstart(tp); } splx(s); break; case TIOCSTI: /* simulate terminal input */ if ((flag & FREAD) == 0 && suser(td)) return (EPERM); if (!isctty(p, tp) && suser(td)) return (EACCES); s = spltty(); ttyld_rint(tp, *(u_char *)data); splx(s); break; case TIOCSTOP: /* stop output, like ^S */ s = spltty(); if (!ISSET(tp->t_state, TS_TTSTOP)) { SET(tp->t_state, TS_TTSTOP); (*tp->t_stop)(tp, 0); } splx(s); break; case TIOCSCTTY: /* become controlling tty */ /* Session ctty vnode pointer set in vnode layer. */ sx_slock(&proctree_lock); if (!SESS_LEADER(p) || ((p->p_session->s_ttyvp || tp->t_session) && (tp->t_session != p->p_session))) { sx_sunlock(&proctree_lock); return (EPERM); } tp->t_session = p->p_session; tp->t_pgrp = p->p_pgrp; SESS_LOCK(p->p_session); ttyref(tp); /* ttyrel(): kern_proc.c:pgdelete() */ p->p_session->s_ttyp = tp; SESS_UNLOCK(p->p_session); PROC_LOCK(p); p->p_flag |= P_CONTROLT; PROC_UNLOCK(p); sx_sunlock(&proctree_lock); break; case TIOCSPGRP: { /* set pgrp of tty */ sx_slock(&proctree_lock); pgrp = pgfind(*(int *)data); if (!isctty(p, tp)) { if (pgrp != NULL) PGRP_UNLOCK(pgrp); sx_sunlock(&proctree_lock); return (ENOTTY); } if (pgrp == NULL) { sx_sunlock(&proctree_lock); return (EPERM); } PGRP_UNLOCK(pgrp); if (pgrp->pg_session != p->p_session) { sx_sunlock(&proctree_lock); return (EPERM); } sx_sunlock(&proctree_lock); tp->t_pgrp = pgrp; break; } case TIOCSTAT: /* simulate control-T */ s = spltty(); ttyinfo(tp); splx(s); break; case TIOCSWINSZ: /* set window size */ if (bcmp((caddr_t)&tp->t_winsize, data, sizeof (struct winsize))) { tp->t_winsize = *(struct winsize *)data; if (tp->t_pgrp != NULL) { PGRP_LOCK(tp->t_pgrp); pgsignal(tp->t_pgrp, SIGWINCH, 1); PGRP_UNLOCK(tp->t_pgrp); } } break; case TIOCSDRAINWAIT: error = suser(td); if (error) return (error); tp->t_timeout = *(int *)data * hz; wakeup(TSA_OCOMPLETE(tp)); wakeup(TSA_OLOWAT(tp)); break; case TIOCGDRAINWAIT: *(int *)data = tp->t_timeout / hz; break; default: #if defined(COMPAT_43) #ifndef BURN_BRIDGES return (ttcompat(tp, cmd, data, flag)); #else return (ENOIOCTL); #endif #else return (ENOIOCTL); #endif } return (0); } int ttypoll(struct cdev *dev, int events, struct thread *td) { int s; int revents = 0; struct tty *tp; tp = tty_gettp(dev); if (tp == NULL) /* XXX used to return ENXIO, but that means true! */ return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)) | POLLHUP); s = spltty(); if (events & (POLLIN | POLLRDNORM)) { if (ttnread(tp) > 0) revents |= events & (POLLIN | POLLRDNORM); else selrecord(td, &tp->t_rsel); } if (events & (POLLOUT | POLLWRNORM)) { if (tp->t_outq.c_cc <= tp->t_olowat && ISSET(tp->t_state, TS_CONNECTED)) revents |= events & (POLLOUT | POLLWRNORM); else selrecord(td, &tp->t_wsel); } if (ISSET(tp->t_state, TS_ZOMBIE)) revents |= POLLERR; splx(s); return (revents); } static struct filterops ttyread_filtops = { 1, NULL, filt_ttyrdetach, filt_ttyread }; static struct filterops ttywrite_filtops = { 1, NULL, filt_ttywdetach, filt_ttywrite }; int ttykqfilter(struct cdev *dev, struct knote *kn) { struct tty *tp; struct knlist *klist; int s; tp = tty_gettp(dev); switch (kn->kn_filter) { case EVFILT_READ: klist = &tp->t_rsel.si_note; kn->kn_fop = &ttyread_filtops; break; case EVFILT_WRITE: klist = &tp->t_wsel.si_note; kn->kn_fop = &ttywrite_filtops; break; default: return (EINVAL); } kn->kn_hook = (caddr_t)dev; s = spltty(); knlist_add(klist, kn, 0); splx(s); return (0); } static void filt_ttyrdetach(struct knote *kn) { struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; int s = spltty(); knlist_remove(&tp->t_rsel.si_note, kn, 0); splx(s); } static int filt_ttyread(struct knote *kn, long hint) { struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; kn->kn_data = ttnread(tp); if (ISSET(tp->t_state, TS_ZOMBIE)) { kn->kn_flags |= EV_EOF; return (1); } return (kn->kn_data > 0); } static void filt_ttywdetach(struct knote *kn) { struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; int s = spltty(); knlist_remove(&tp->t_wsel.si_note, kn, 0); splx(s); } static int filt_ttywrite(struct knote *kn, long hint) { struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; kn->kn_data = tp->t_outq.c_cc; if (ISSET(tp->t_state, TS_ZOMBIE)) return (1); return (kn->kn_data <= tp->t_olowat && ISSET(tp->t_state, TS_CONNECTED)); } /* * Must be called at spltty(). */ static int ttnread(struct tty *tp) { int nread; if (ISSET(tp->t_lflag, PENDIN)) ttypend(tp); nread = tp->t_canq.c_cc; if (!ISSET(tp->t_lflag, ICANON)) { nread += tp->t_rawq.c_cc; if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) nread = 0; } return (nread); } /* * Wait for output to drain. */ int ttywait(struct tty *tp) { int error, s; error = 0; s = spltty(); while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { (*tp->t_oproc)(tp); if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && ISSET(tp->t_state, TS_CONNECTED)) { SET(tp->t_state, TS_SO_OCOMPLETE); error = ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI | PCATCH, "ttywai", tp->t_timeout); if (error) { if (error == EWOULDBLOCK) error = EIO; break; } } else break; } if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) error = EIO; splx(s); return (error); } /* * Flush if successfully wait. */ static int ttywflush(struct tty *tp) { int error; if ((error = ttywait(tp)) == 0) ttyflush(tp, FREAD); return (error); } /* * Flush tty read and/or write queues, notifying anyone waiting. */ void ttyflush(struct tty *tp, int rw) { int s; s = spltty(); #if 0 again: #endif if (rw & FWRITE) { FLUSHQ(&tp->t_outq); CLR(tp->t_state, TS_TTSTOP); } (*tp->t_stop)(tp, rw); if (rw & FREAD) { FLUSHQ(&tp->t_canq); FLUSHQ(&tp->t_rawq); CLR(tp->t_lflag, PENDIN); tp->t_rocount = 0; tp->t_rocol = 0; CLR(tp->t_state, TS_LOCAL); ttwakeup(tp); if (ISSET(tp->t_state, TS_TBLOCK)) { if (rw & FWRITE) FLUSHQ(&tp->t_outq); ttyunblock(tp); /* * Don't let leave any state that might clobber the * next line discipline (although we should do more * to send the START char). Not clearing the state * may have caused the "putc to a clist with no * reserved cblocks" panic/printf. */ CLR(tp->t_state, TS_TBLOCK); #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ if (ISSET(tp->t_iflag, IXOFF)) { /* * XXX wait a bit in the hope that the stop * character (if any) will go out. Waiting * isn't good since it allows races. This * will be fixed when the stop character is * put in a special queue. Don't bother with * the checks in ttywait() since the timeout * will save us. */ SET(tp->t_state, TS_SO_OCOMPLETE); ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI, "ttyfls", hz / 10); /* * Don't try sending the stop character again. */ CLR(tp->t_state, TS_TBLOCK); goto again; } #endif } } if (rw & FWRITE) { FLUSHQ(&tp->t_outq); ttwwakeup(tp); } splx(s); } /* * Copy in the default termios characters. */ void termioschars(struct termios *t) { bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); } /* * Old interface. */ void ttychars(struct tty *tp) { termioschars(&tp->t_termios); } /* * Handle input high water. Send stop character for the IXOFF case. Turn * on our input flow control bit and propagate the changes to the driver. * XXX the stop character should be put in a special high priority queue. */ void ttyblock(struct tty *tp) { SET(tp->t_state, TS_TBLOCK); if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) CLR(tp->t_state, TS_TBLOCK); /* try again later */ ttstart(tp); } /* * Handle input low water. Send start character for the IXOFF case. Turn * off our input flow control bit and propagate the changes to the driver. * XXX the start character should be put in a special high priority queue. */ static void ttyunblock(struct tty *tp) { CLR(tp->t_state, TS_TBLOCK); if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && putc(tp->t_cc[VSTART], &tp->t_outq) != 0) SET(tp->t_state, TS_TBLOCK); /* try again later */ ttstart(tp); } #ifdef notyet /* Not used by any current (i386) drivers. */ /* * Restart after an inter-char delay. */ void ttrstrt(void *tp_arg) { struct tty *tp; int s; KASSERT(tp_arg != NULL, ("ttrstrt")); tp = tp_arg; s = spltty(); CLR(tp->t_state, TS_TIMEOUT); ttstart(tp); splx(s); } #endif int ttstart(struct tty *tp) { if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ (*tp->t_oproc)(tp); return (0); } /* * "close" a line discipline */ int ttylclose(struct tty *tp, int flag) { if (flag & FNONBLOCK || ttywflush(tp)) ttyflush(tp, FREAD | FWRITE); return (0); } /* * Handle modem control transition on a tty. * Flag indicates new state of carrier. * Returns 0 if the line should be turned off, otherwise 1. */ int ttymodem(struct tty *tp, int flag) { if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { /* * MDMBUF: do flow control according to carrier flag * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP * works if IXON and IXANY are clear. */ if (flag) { CLR(tp->t_state, TS_CAR_OFLOW); CLR(tp->t_state, TS_TTSTOP); ttstart(tp); } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) { SET(tp->t_state, TS_CAR_OFLOW); SET(tp->t_state, TS_TTSTOP); (*tp->t_stop)(tp, 0); } } else if (flag == 0) { /* * Lost carrier. */ CLR(tp->t_state, TS_CARR_ON); if (ISSET(tp->t_state, TS_ISOPEN) && !ISSET(tp->t_cflag, CLOCAL)) { SET(tp->t_state, TS_ZOMBIE); CLR(tp->t_state, TS_CONNECTED); if (tp->t_session) { sx_slock(&proctree_lock); if (tp->t_session->s_leader) { struct proc *p; p = tp->t_session->s_leader; PROC_LOCK(p); psignal(p, SIGHUP); PROC_UNLOCK(p); } sx_sunlock(&proctree_lock); } ttyflush(tp, FREAD | FWRITE); return (0); } } else { /* * Carrier now on. */ SET(tp->t_state, TS_CARR_ON); if (!ISSET(tp->t_state, TS_ZOMBIE)) SET(tp->t_state, TS_CONNECTED); wakeup(TSA_CARR_ON(tp)); ttwakeup(tp); ttwwakeup(tp); } return (1); } /* * Reinput pending characters after state switch * call at spltty(). */ static void ttypend(struct tty *tp) { struct clist tq; int c; CLR(tp->t_lflag, PENDIN); SET(tp->t_state, TS_TYPEN); /* * XXX this assumes too much about clist internals. It may even * fail if the cblock slush pool is empty. We can't allocate more * cblocks here because we are called from an interrupt handler * and clist_alloc_cblocks() can wait. */ tq = tp->t_rawq; bzero(&tp->t_rawq, sizeof tp->t_rawq); tp->t_rawq.c_cbmax = tq.c_cbmax; tp->t_rawq.c_cbreserved = tq.c_cbreserved; while ((c = getc(&tq)) >= 0) ttyinput(c, tp); CLR(tp->t_state, TS_TYPEN); } /* * Process a read call on a tty device. */ int ttread(struct tty *tp, struct uio *uio, int flag) { struct clist *qp; int c; tcflag_t lflag; cc_t *cc = tp->t_cc; struct thread *td; struct proc *p; int s, first, error = 0; int has_stime = 0, last_cc = 0; long slp = 0; /* XXX this should be renamed `timo'. */ struct timeval stime; struct pgrp *pg; td = curthread; p = td->td_proc; loop: s = spltty(); lflag = tp->t_lflag; /* * take pending input first */ if (ISSET(lflag, PENDIN)) { ttypend(tp); splx(s); /* reduce latency */ s = spltty(); lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ } /* * Hang process if it's in the background. */ if (isbackground(p, tp)) { splx(s); sx_slock(&proctree_lock); PROC_LOCK(p); if (SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTIN) || SIGISMEMBER(td->td_sigmask, SIGTTIN) || (p->p_flag & P_PPWAIT) || p->p_pgrp->pg_jobc == 0) { PROC_UNLOCK(p); sx_sunlock(&proctree_lock); return (EIO); } pg = p->p_pgrp; PROC_UNLOCK(p); PGRP_LOCK(pg); sx_sunlock(&proctree_lock); pgsignal(pg, SIGTTIN, 1); PGRP_UNLOCK(pg); error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0); if (error) return (error); goto loop; } if (ISSET(tp->t_state, TS_ZOMBIE)) { splx(s); return (0); /* EOF */ } /* * If canonical, use the canonical queue, * else use the raw queue. * * (should get rid of clists...) */ qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; if (flag & IO_NDELAY) { if (qp->c_cc > 0) goto read; if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { splx(s); return (0); } splx(s); return (EWOULDBLOCK); } if (!ISSET(lflag, ICANON)) { int m = cc[VMIN]; long t = cc[VTIME]; struct timeval timecopy; /* * Check each of the four combinations. * (m > 0 && t == 0) is the normal read case. * It should be fairly efficient, so we check that and its * companion case (m == 0 && t == 0) first. * For the other two cases, we compute the target sleep time * into slp. */ if (t == 0) { if (qp->c_cc < m) goto sleep; if (qp->c_cc > 0) goto read; /* m, t and qp->c_cc are all 0. 0 is enough input. */ splx(s); return (0); } t *= 100000; /* time in us */ #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ ((t1).tv_usec - (t2).tv_usec)) if (m > 0) { if (qp->c_cc <= 0) goto sleep; if (qp->c_cc >= m) goto read; getmicrotime(&timecopy); if (!has_stime) { /* first character, start timer */ has_stime = 1; stime = timecopy; slp = t; } else if (qp->c_cc > last_cc) { /* got a character, restart timer */ stime = timecopy; slp = t; } else { /* nothing, check expiration */ slp = t - diff(timecopy, stime); if (slp <= 0) goto read; } last_cc = qp->c_cc; } else { /* m == 0 */ if (qp->c_cc > 0) goto read; getmicrotime(&timecopy); if (!has_stime) { has_stime = 1; stime = timecopy; slp = t; } else { slp = t - diff(timecopy, stime); if (slp <= 0) { /* Timed out, but 0 is enough input. */ splx(s); return (0); } } } #undef diff /* * Rounding down may make us wake up just short * of the target, so we round up. * The formula is ceiling(slp * hz/1000000). * 32-bit arithmetic is enough for hz < 169. * XXX see tvtohz() for how to avoid overflow if hz * is large (divide by `tick' and/or arrange to * use tvtohz() if hz is large). */ slp = (long) (((u_long)slp * hz) + 999999) / 1000000; goto sleep; } if (qp->c_cc <= 0) { sleep: /* * There is no input, or not enough input and we can block. */ error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH, ISSET(tp->t_state, TS_CONNECTED) ? "ttyin" : "ttyhup", (int)slp); splx(s); if (error == EWOULDBLOCK) error = 0; else if (error) return (error); /* * XXX what happens if another process eats some input * while we are asleep (not just here)? It would be * safest to detect changes and reset our state variables * (has_stime and last_cc). */ slp = 0; goto loop; } read: splx(s); /* * Input present, check for input mapping and processing. */ first = 1; if (ISSET(lflag, ICANON | ISIG)) goto slowcase; for (;;) { char ibuf[IBUFSIZ]; int icc; icc = imin(uio->uio_resid, IBUFSIZ); icc = q_to_b(qp, ibuf, icc); if (icc <= 0) { if (first) goto loop; break; } error = uiomove(ibuf, icc, uio); /* * XXX if there was an error then we should ungetc() the * unmoved chars and reduce icc here. */ if (error) break; if (uio->uio_resid == 0) break; first = 0; } goto out; slowcase: for (;;) { c = getc(qp); if (c < 0) { if (first) goto loop; break; } /* * delayed suspend (^Y) */ if (CCEQ(cc[VDSUSP], c) && ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) { if (tp->t_pgrp != NULL) { PGRP_LOCK(tp->t_pgrp); pgsignal(tp->t_pgrp, SIGTSTP, 1); PGRP_UNLOCK(tp->t_pgrp); } if (first) { error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg3", 0); if (error) break; goto loop; } break; } /* * Interpret EOF only in canonical mode. */ if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) break; /* * Give user character. */ error = ureadc(c, uio); if (error) /* XXX should ungetc(c, qp). */ break; if (uio->uio_resid == 0) break; /* * In canonical mode check for a "break character" * marking the end of a "line of input". */ if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) break; first = 0; } out: /* * Look to unblock input now that (presumably) * the input queue has gone down. */ s = spltty(); if (ISSET(tp->t_state, TS_TBLOCK) && tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat) ttyunblock(tp); splx(s); return (error); } /* * Check the output queue on tp for space for a kernel message (from uprintf * or tprintf). Allow some space over the normal hiwater mark so we don't * lose messages due to normal flow control, but don't let the tty run amok. * Sleeps here are not interruptible, but we return prematurely if new signals * arrive. */ int ttycheckoutq(struct tty *tp, int wait) { int hiwat, s; sigset_t oldmask; struct thread *td; struct proc *p; td = curthread; p = td->td_proc; hiwat = tp->t_ohiwat; SIGEMPTYSET(oldmask); s = spltty(); if (wait) { PROC_LOCK(p); oldmask = td->td_siglist; PROC_UNLOCK(p); } if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) while (tp->t_outq.c_cc > hiwat) { ttstart(tp); if (tp->t_outq.c_cc <= hiwat) break; if (!wait) { splx(s); return (0); } PROC_LOCK(p); if (!SIGSETEQ(td->td_siglist, oldmask)) { PROC_UNLOCK(p); splx(s); return (0); } PROC_UNLOCK(p); SET(tp->t_state, TS_SO_OLOWAT); tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz); } splx(s); return (1); } /* * Process a write call on a tty device. */ int ttwrite(struct tty *tp, struct uio *uio, int flag) { char *cp = NULL; int cc, ce; struct thread *td; struct proc *p; int i, hiwat, cnt, error, s; char obuf[OBUFSIZ]; hiwat = tp->t_ohiwat; cnt = uio->uio_resid; error = 0; cc = 0; td = curthread; p = td->td_proc; loop: s = spltty(); if (ISSET(tp->t_state, TS_ZOMBIE)) { splx(s); if (uio->uio_resid == cnt) error = EIO; goto out; } if (!ISSET(tp->t_state, TS_CONNECTED)) { if (flag & IO_NDELAY) { splx(s); error = EWOULDBLOCK; goto out; } error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, "ttywdcd", 0); splx(s); if (error) goto out; goto loop; } splx(s); /* * Hang the process if it's in the background. */ sx_slock(&proctree_lock); PROC_LOCK(p); if (isbackground(p, tp) && ISSET(tp->t_lflag, TOSTOP) && !(p->p_flag & P_PPWAIT) && !SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTOU) && !SIGISMEMBER(td->td_sigmask, SIGTTOU)) { if (p->p_pgrp->pg_jobc == 0) { PROC_UNLOCK(p); sx_sunlock(&proctree_lock); error = EIO; goto out; } PROC_UNLOCK(p); PGRP_LOCK(p->p_pgrp); sx_sunlock(&proctree_lock); pgsignal(p->p_pgrp, SIGTTOU, 1); PGRP_UNLOCK(p->p_pgrp); error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0); if (error) goto out; goto loop; } else { PROC_UNLOCK(p); sx_sunlock(&proctree_lock); } /* * Process the user's data in at most OBUFSIZ chunks. Perform any * output translation. Keep track of high water mark, sleep on * overflow awaiting device aid in acquiring new space. */ while (uio->uio_resid > 0 || cc > 0) { if (ISSET(tp->t_lflag, FLUSHO)) { uio->uio_resid = 0; return (0); } if (tp->t_outq.c_cc > hiwat) goto ovhiwat; /* * Grab a hunk of data from the user, unless we have some * leftover from last time. */ if (cc == 0) { cc = imin(uio->uio_resid, OBUFSIZ); cp = obuf; error = uiomove(cp, cc, uio); if (error) { cc = 0; break; } } /* * If nothing fancy need be done, grab those characters we * can handle without any of ttyoutput's processing and * just transfer them to the output q. For those chars * which require special processing (as indicated by the * bits in char_type), call ttyoutput. After processing * a hunk of data, look for FLUSHO so ^O's will take effect * immediately. */ while (cc > 0) { if (!ISSET(tp->t_oflag, OPOST)) ce = cc; else { ce = cc - scanc((u_int)cc, (u_char *)cp, char_type, CCLASSMASK); /* * If ce is zero, then we're processing * a special character through ttyoutput. */ if (ce == 0) { tp->t_rocount = 0; if (ttyoutput(*cp, tp) >= 0) { /* No Clists, wait a bit. */ ttstart(tp); if (flag & IO_NDELAY) { error = EWOULDBLOCK; goto out; } error = ttysleep(tp, &lbolt, TTOPRI|PCATCH, "ttybf1", 0); if (error) goto out; goto loop; } cp++; cc--; if (ISSET(tp->t_lflag, FLUSHO) || tp->t_outq.c_cc > hiwat) goto ovhiwat; continue; } } /* * A bunch of normal characters have been found. * Transfer them en masse to the output queue and * continue processing at the top of the loop. * If there are any further characters in this * <= OBUFSIZ chunk, the first should be a character * requiring special handling by ttyoutput. */ tp->t_rocount = 0; i = b_to_q(cp, ce, &tp->t_outq); ce -= i; tp->t_column += ce; cp += ce, cc -= ce, tk_nout += ce; tp->t_outcc += ce; if (i > 0) { /* No Clists, wait a bit. */ ttstart(tp); if (flag & IO_NDELAY) { error = EWOULDBLOCK; goto out; } error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybf2", 0); if (error) goto out; goto loop; } if (ISSET(tp->t_lflag, FLUSHO) || tp->t_outq.c_cc > hiwat) break; } ttstart(tp); } out: /* * If cc is nonzero, we leave the uio structure inconsistent, as the * offset and iov pointers have moved forward, but it doesn't matter * (the call will either return short or restart with a new uio). */ uio->uio_resid += cc; return (error); ovhiwat: ttstart(tp); s = spltty(); /* * This can only occur if FLUSHO is set in t_lflag, * or if ttstart/oproc is synchronous (or very fast). */ if (tp->t_outq.c_cc <= hiwat) { splx(s); goto loop; } if (flag & IO_NDELAY) { splx(s); uio->uio_resid += cc; return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); } SET(tp->t_state, TS_SO_OLOWAT); error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri", tp->t_timeout); splx(s); if (error == EWOULDBLOCK) error = EIO; if (error) goto out; goto loop; } /* * Rubout one character from the rawq of tp * as cleanly as possible. */ static void ttyrub(int c, struct tty *tp) { char *cp; int savecol; int tabc, s; if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) return; CLR(tp->t_lflag, FLUSHO); if (ISSET(tp->t_lflag, ECHOE)) { if (tp->t_rocount == 0) { /* * Screwed by ttwrite; retype */ ttyretype(tp); return; } if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) ttyrubo(tp, 2); else { CLR(c, ~TTY_CHARMASK); switch (CCLASS(c)) { case ORDINARY: ttyrubo(tp, 1); break; case BACKSPACE: case CONTROL: case NEWLINE: case RETURN: case VTAB: if (ISSET(tp->t_lflag, ECHOCTL)) ttyrubo(tp, 2); break; case TAB: if (tp->t_rocount < tp->t_rawq.c_cc) { ttyretype(tp); return; } s = spltty(); savecol = tp->t_column; SET(tp->t_state, TS_CNTTB); SET(tp->t_lflag, FLUSHO); tp->t_column = tp->t_rocol; cp = tp->t_rawq.c_cf; if (cp) tabc = *cp; /* XXX FIX NEXTC */ for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) ttyecho(tabc, tp); CLR(tp->t_lflag, FLUSHO); CLR(tp->t_state, TS_CNTTB); splx(s); /* savecol will now be length of the tab. */ savecol -= tp->t_column; tp->t_column += savecol; if (savecol > 8) savecol = 8; /* overflow screw */ while (--savecol >= 0) (void)ttyoutput('\b', tp); break; default: /* XXX */ #define PANICSTR "ttyrub: would panic c = %d, val = %d\n" (void)printf(PANICSTR, c, CCLASS(c)); #ifdef notdef panic(PANICSTR, c, CCLASS(c)); #endif } } } else if (ISSET(tp->t_lflag, ECHOPRT)) { if (!ISSET(tp->t_state, TS_ERASE)) { SET(tp->t_state, TS_ERASE); (void)ttyoutput('\\', tp); } ttyecho(c, tp); } else { ttyecho(tp->t_cc[VERASE], tp); /* * This code may be executed not only when an ERASE key * is pressed, but also when ^U (KILL) or ^W (WERASE) are. * So, I didn't think it was worthwhile to pass the extra * information (which would need an extra parameter, * changing every call) needed to distinguish the ERASE2 * case from the ERASE. */ } --tp->t_rocount; } /* * Back over cnt characters, erasing them. */ static void ttyrubo(struct tty *tp, int cnt) { while (cnt-- > 0) { (void)ttyoutput('\b', tp); (void)ttyoutput(' ', tp); (void)ttyoutput('\b', tp); } } /* * ttyretype -- * Reprint the rawq line. Note, it is assumed that c_cc has already * been checked. */ static void ttyretype(struct tty *tp) { char *cp; int s, c; /* Echo the reprint character. */ if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) ttyecho(tp->t_cc[VREPRINT], tp); (void)ttyoutput('\n', tp); /* * XXX * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE * BIT OF FIRST CHAR. */ s = spltty(); for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) ttyecho(c, tp); for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) ttyecho(c, tp); CLR(tp->t_state, TS_ERASE); splx(s); tp->t_rocount = tp->t_rawq.c_cc; tp->t_rocol = 0; } /* * Echo a typed character to the terminal. */ static void ttyecho(int c, struct tty *tp) { if (!ISSET(tp->t_state, TS_CNTTB)) CLR(tp->t_lflag, FLUSHO); if ((!ISSET(tp->t_lflag, ECHO) && (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) || ISSET(tp->t_lflag, EXTPROC)) return; if (ISSET(tp->t_lflag, ECHOCTL) && ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || ISSET(c, TTY_CHARMASK) == 0177)) { (void)ttyoutput('^', tp); CLR(c, ~TTY_CHARMASK); if (c == 0177) c = '?'; else c += 'A' - 1; } (void)ttyoutput(c, tp); } /* * Wake up any readers on a tty. */ void ttwakeup(struct tty *tp) { if (SEL_WAITING(&tp->t_rsel)) selwakeuppri(&tp->t_rsel, TTIPRI); if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); wakeup(TSA_HUP_OR_INPUT(tp)); KNOTE_UNLOCKED(&tp->t_rsel.si_note, 0); } /* * Wake up any writers on a tty. */ void ttwwakeup(struct tty *tp) { if (SEL_WAITING(&tp->t_wsel) && tp->t_outq.c_cc <= tp->t_olowat) selwakeuppri(&tp->t_wsel, TTOPRI); if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { CLR(tp->t_state, TS_SO_OCOMPLETE); wakeup(TSA_OCOMPLETE(tp)); } if (ISSET(tp->t_state, TS_SO_OLOWAT) && tp->t_outq.c_cc <= tp->t_olowat) { CLR(tp->t_state, TS_SO_OLOWAT); wakeup(TSA_OLOWAT(tp)); } KNOTE_UNLOCKED(&tp->t_wsel.si_note, 0); } /* * Look up a code for a specified speed in a conversion table; * used by drivers to map software speed values to hardware parameters. */ int ttspeedtab(int speed, struct speedtab *table) { for ( ; table->sp_speed != -1; table++) if (table->sp_speed == speed) return (table->sp_code); return (-1); } /* * Set input and output watermarks and buffer sizes. For input, the * high watermark is about one second's worth of input above empty, the * low watermark is slightly below high water, and the buffer size is a * driver-dependent amount above high water. For output, the watermarks * are near the ends of the buffer, with about 1 second's worth of input * between them. All this only applies to the standard line discipline. */ void ttsetwater(struct tty *tp) { int cps, ttmaxhiwat, x; /* Input. */ clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); switch (tp->t_ispeedwat) { case (speed_t)-1: cps = tp->t_ispeed / 10; break; case 0: /* * This case is for old drivers that don't know about * t_ispeedwat. Arrange for them to get the old buffer * sizes and watermarks. */ cps = TTYHOG - 2 * 256; tp->t_ififosize = 2 * 256; break; default: cps = tp->t_ispeedwat / 10; break; } tp->t_ihiwat = cps; tp->t_ilowat = 7 * cps / 8; x = cps + tp->t_ififosize; clist_alloc_cblocks(&tp->t_rawq, x, x); /* Output. */ switch (tp->t_ospeedwat) { case (speed_t)-1: cps = tp->t_ospeed / 10; ttmaxhiwat = 2 * TTMAXHIWAT; break; case 0: cps = tp->t_ospeed / 10; ttmaxhiwat = TTMAXHIWAT; break; default: cps = tp->t_ospeedwat / 10; ttmaxhiwat = 8 * TTMAXHIWAT; break; } #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); x += cps; x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */ tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */ x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */ x += OBUFSIZ + 100; clist_alloc_cblocks(&tp->t_outq, x, x); #undef CLAMP } /* * Report on state of foreground process group. */ void ttyinfo(struct tty *tp) { struct timeval utime, stime; struct proc *p, *pick; struct thread *td; const char *stateprefix, *state; long rss; int load, pctcpu; if (ttycheckoutq(tp,0) == 0) return; /* Print load average. */ load = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; ttyprintf(tp, "load: %d.%02d ", load / 100, load % 100); /* * On return following a ttyprintf(), we set tp->t_rocount to 0 so * that pending input will be retyped on BS. */ if (tp->t_session == NULL) { ttyprintf(tp, "not a controlling terminal\n"); tp->t_rocount = 0; return; } if (tp->t_pgrp == NULL) { ttyprintf(tp, "no foreground process group\n"); tp->t_rocount = 0; return; } sx_slock(&proctree_lock); if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == NULL) { sx_sunlock(&proctree_lock); ttyprintf(tp, "empty foreground process group\n"); tp->t_rocount = 0; return; } /* * Pick the most interesting process and copy some of its * state for printing later. sched_lock must be held for * most parts of this. Holding it throughout is simplest * and prevents even unimportant inconsistencies in the * copy of the state, but may increase interrupt latency * too much. */ mtx_lock_spin(&sched_lock); for (pick = NULL; p != NULL; p = LIST_NEXT(p, p_pglist)) if (proc_compare(pick, p)) pick = p; td = FIRST_THREAD_IN_PROC(pick); /* XXXKSE */ #if 0 KASSERT(td != NULL, ("ttyinfo: no thread")); #else if (td == NULL) { mtx_unlock_spin(&sched_lock); sx_sunlock(&proctree_lock); ttyprintf(tp, "foreground process without thread\n"); tp->t_rocount = 0; return; } #endif stateprefix = ""; if (TD_IS_RUNNING(td)) state = "running"; else if (TD_ON_RUNQ(td) || TD_CAN_RUN(td)) state = "runnable"; else if (TD_IS_SLEEPING(td)) { /* XXX: If we're sleeping, are we ever not in a queue? */ if (TD_ON_SLEEPQ(td)) state = td->td_wmesg; else state = "sleeping without queue"; } else if (TD_ON_LOCK(td)) { state = td->td_lockname; stateprefix = "*"; } else if (TD_IS_SUSPENDED(td)) state = "suspended"; else if (TD_AWAITING_INTR(td)) state = "intrwait"; else state = "unknown"; pctcpu = (sched_pctcpu(td) * 10000 + FSCALE / 2) >> FSHIFT; if (pick->p_state == PRS_NEW || pick->p_state == PRS_ZOMBIE) rss = 0; else rss = pgtok(vmspace_resident_count(pick->p_vmspace)); mtx_unlock_spin(&sched_lock); PROC_LOCK(pick); calcru(pick, &utime, &stime); PROC_UNLOCK(pick); /* Print command, pid, state, utime, stime, %cpu, and rss. */ ttyprintf(tp, " cmd: %s %d [%s%s] %ld.%02ldu %ld.%02lds %d%% %ldk\n", pick->p_comm, pick->p_pid, stateprefix, state, (long)utime.tv_sec, utime.tv_usec / 10000, (long)stime.tv_sec, stime.tv_usec / 10000, pctcpu / 100, rss); tp->t_rocount = 0; sx_sunlock(&proctree_lock); } /* * Returns 1 if p2 is "better" than p1 * * The algorithm for picking the "interesting" process is thus: * * 1) Only foreground processes are eligible - implied. * 2) Runnable processes are favored over anything else. The runner * with the highest cpu utilization is picked (p_estcpu). Ties are * broken by picking the highest pid. * 3) The sleeper with the shortest sleep time is next. With ties, * we pick out just "short-term" sleepers (P_SINTR == 0). * 4) Further ties are broken by picking the highest pid. */ #define ISRUN(p, val) \ do { \ struct thread *td; \ val = 0; \ FOREACH_THREAD_IN_PROC(p, td) { \ if (TD_ON_RUNQ(td) || \ TD_IS_RUNNING(td)) { \ val = 1; \ break; \ } \ } \ } while (0) #define TESTAB(a, b) ((a)<<1 | (b)) #define ONLYA 2 #define ONLYB 1 #define BOTH 3 static int proc_compare(struct proc *p1, struct proc *p2) { int esta, estb; struct ksegrp *kg; mtx_assert(&sched_lock, MA_OWNED); if (p1 == NULL) return (1); ISRUN(p1, esta); ISRUN(p2, estb); /* * see if at least one of them is runnable */ switch (TESTAB(esta, estb)) { case ONLYA: return (0); case ONLYB: return (1); case BOTH: /* * tie - favor one with highest recent cpu utilization */ esta = estb = 0; FOREACH_KSEGRP_IN_PROC(p1,kg) { esta += kg->kg_estcpu; } FOREACH_KSEGRP_IN_PROC(p2,kg) { estb += kg->kg_estcpu; } if (estb > esta) return (1); if (esta > estb) return (0); return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ } /* * weed out zombies */ switch (TESTAB(p1->p_state == PRS_ZOMBIE, p2->p_state == PRS_ZOMBIE)) { case ONLYA: return (1); case ONLYB: return (0); case BOTH: return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ } #if 0 /* XXXKSE */ /* * pick the one with the smallest sleep time */ if (p2->p_slptime > p1->p_slptime) return (0); if (p1->p_slptime > p2->p_slptime) return (1); /* * favor one sleeping in a non-interruptible sleep */ if (p1->p_sflag & PS_SINTR && (p2->p_sflag & PS_SINTR) == 0) return (1); if (p2->p_sflag & PS_SINTR && (p1->p_sflag & PS_SINTR) == 0) return (0); #endif return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ } /* * Output char to tty; console putchar style. */ int tputchar(int c, struct tty *tp) { int s; s = spltty(); if (!ISSET(tp->t_state, TS_CONNECTED)) { splx(s); return (-1); } if (c == '\n') (void)ttyoutput('\r', tp); (void)ttyoutput(c, tp); ttstart(tp); splx(s); return (0); } /* * Sleep on chan, returning ERESTART if tty changed while we napped and * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If * the tty is revoked, restarting a pending call will redo validation done * at the start of the call. */ int ttysleep(struct tty *tp, void *chan, int pri, char *wmesg, int timo) { int error; int gen; gen = tp->t_gen; error = tsleep(chan, pri, wmesg, timo); if (tp->t_state & TS_GONE) return (ENXIO); if (error) return (error); return (tp->t_gen == gen ? 0 : ERESTART); } /* * Gain a reference to a TTY */ int ttyref(struct tty *tp) { int i; mtx_lock(&tp->t_mtx); KASSERT(tp->t_refcnt > 0, ("ttyref(): tty refcnt is %d (%s)", tp->t_refcnt, tp->t_dev != NULL ? devtoname(tp->t_dev) : "??")); i = ++tp->t_refcnt; mtx_unlock(&tp->t_mtx); return (i); } /* * Drop a reference to a TTY. * When reference count drops to zero, we free it. */ int ttyrel(struct tty *tp) { int i; mtx_lock(&tty_list_mutex); mtx_lock(&tp->t_mtx); KASSERT(tp->t_refcnt > 0, ("ttyrel(): tty refcnt is %d (%s)", tp->t_refcnt, tp->t_dev != NULL ? devtoname(tp->t_dev) : "??")); i = --tp->t_refcnt; if (i != 0) { mtx_unlock(&tp->t_mtx); mtx_unlock(&tty_list_mutex); return (i); } TAILQ_REMOVE(&tty_list, tp, t_list); mtx_unlock(&tp->t_mtx); mtx_unlock(&tty_list_mutex); knlist_destroy(&tp->t_rsel.si_note); knlist_destroy(&tp->t_wsel.si_note); mtx_destroy(&tp->t_mtx); free(tp, M_TTYS); return (i); } /* * Allocate a tty struct. Clists in the struct will be allocated by * tty_open(). */ struct tty * ttymalloc(struct tty *tp) { static int once; if (!once) { mtx_init(&tty_list_mutex, "ttylist", NULL, MTX_DEF); once++; } if (tp) { /* * XXX: Either this argument should go away, or we should * XXX: require it and do a ttyrel(tp) here and allocate * XXX: a new tty. For now do nothing. */ return(tp); } tp = malloc(sizeof *tp, M_TTYS, M_WAITOK | M_ZERO); mtx_init(&tp->t_mtx, "tty", NULL, MTX_DEF); /* * Set up the initial state */ tp->t_refcnt = 1; tp->t_timeout = -1; tp->t_dtr_wait = 3 * hz; ttyinitmode(tp, 0, 0); bcopy(ttydefchars, tp->t_init_in.c_cc, sizeof tp->t_init_in.c_cc); /* Make callout the same as callin */ tp->t_init_out = tp->t_init_in; mtx_lock(&tty_list_mutex); TAILQ_INSERT_TAIL(&tty_list, tp, t_list); mtx_unlock(&tty_list_mutex); knlist_init(&tp->t_rsel.si_note, &tp->t_mtx); knlist_init(&tp->t_wsel.si_note, &tp->t_mtx); return (tp); } struct tty * ttyalloc() { return (ttymalloc(NULL)); } static void ttypurge(struct cdev *dev) { if (dev->si_tty == NULL) return; ttygone(dev->si_tty); } /* * ttycreate() * * Create the device entries for this tty thereby opening it for business. * * The flags argument controls if "cua" units are created. * * The t_sc filed is copied to si_drv1 in the created cdevs. This * is particularly important for ->t_cioctl() users. * * XXX: implement the init and lock devices by cloning. */ int ttycreate(struct tty *tp, struct cdevsw *csw, int unit, int flags, const char *fmt, ...) { char namebuf[SPECNAMELEN - 3]; /* XXX space for "tty" */ va_list ap; struct cdev *cp; int i, minor, sminor, sunit; mtx_assert(&Giant, MA_OWNED); if (tty_unit == NULL) tty_unit = new_unrhdr(0, 0xffff); sunit = alloc_unr(tty_unit); tp->t_devunit = sunit; if (csw == NULL) { csw = &tty_cdevsw; unit = sunit; } KASSERT(csw->d_purge == NULL || csw->d_purge == ttypurge, ("tty should not have d_purge")); csw->d_purge = ttypurge; minor = unit2minor(unit); sminor = unit2minor(sunit); va_start(ap, fmt); i = vsnrprintf(namebuf, sizeof namebuf, 32, fmt, ap); va_end(ap); KASSERT(i < sizeof namebuf, ("Too long tty name (%s)", namebuf)); cp = make_dev(csw, minor, UID_ROOT, GID_WHEEL, 0600, "tty%s", namebuf); tp->t_dev = cp; tp->t_mdev = cp; cp->si_tty = tp; cp->si_drv1 = tp->t_sc; cp = make_dev(&ttys_cdevsw, sminor | MINOR_INIT, UID_ROOT, GID_WHEEL, 0600, "tty%s.init", namebuf); dev_depends(tp->t_dev, cp); cp->si_drv1 = tp->t_sc; cp->si_drv2 = &tp->t_init_in; cp->si_tty = tp; cp = make_dev(&ttys_cdevsw, sminor | MINOR_LOCK, UID_ROOT, GID_WHEEL, 0600, "tty%s.lock", namebuf); dev_depends(tp->t_dev, cp); cp->si_drv1 = tp->t_sc; cp->si_drv2 = &tp->t_lock_in; cp->si_tty = tp; if (flags & MINOR_CALLOUT) { cp = make_dev(csw, minor | MINOR_CALLOUT, UID_UUCP, GID_DIALER, 0660, "cua%s", namebuf); dev_depends(tp->t_dev, cp); cp->si_drv1 = tp->t_sc; cp->si_tty = tp; cp = make_dev(&ttys_cdevsw, sminor | MINOR_CALLOUT | MINOR_INIT, UID_UUCP, GID_DIALER, 0660, "cua%s.init", namebuf); dev_depends(tp->t_dev, cp); cp->si_drv1 = tp->t_sc; cp->si_drv2 = &tp->t_init_out; cp->si_tty = tp; cp = make_dev(&ttys_cdevsw, sminor | MINOR_CALLOUT | MINOR_LOCK, UID_UUCP, GID_DIALER, 0660, "cua%s.lock", namebuf); dev_depends(tp->t_dev, cp); cp->si_drv1 = tp->t_sc; cp->si_drv2 = &tp->t_lock_out; cp->si_tty = tp; } return (0); } /* * This function is called when the hardware disappears. We set a flag * and wake up stuff so all sleeping threads will notice. */ void ttygone(struct tty *tp) { tp->t_state |= TS_GONE; wakeup(&tp->t_dtr_wait); wakeup(TSA_CARR_ON(tp)); wakeup(TSA_HUP_OR_INPUT(tp)); wakeup(TSA_OCOMPLETE(tp)); wakeup(TSA_OLOWAT(tp)); if (tp->t_purge != NULL) tp->t_purge(tp); } /* * ttyfree() * * Called when the driver is ready to free the tty structure. * * XXX: This shall sleep until all threads have left the driver. */ void ttyfree(struct tty *tp) { u_int unit; mtx_assert(&Giant, MA_OWNED); ttygone(tp); unit = tp->t_devunit; destroy_dev(tp->t_mdev); free_unr(tty_unit, unit); } static int sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) { struct tty *tp, *tp2; struct xtty xt; int error; error = 0; mtx_lock(&tty_list_mutex); tp = TAILQ_FIRST(&tty_list); if (tp != NULL) ttyref(tp); mtx_unlock(&tty_list_mutex); while (tp != NULL) { bzero(&xt, sizeof xt); xt.xt_size = sizeof xt; #define XT_COPY(field) xt.xt_##field = tp->t_##field xt.xt_rawcc = tp->t_rawq.c_cc; xt.xt_cancc = tp->t_canq.c_cc; xt.xt_outcc = tp->t_outq.c_cc; XT_COPY(line); if (tp->t_dev != NULL) xt.xt_dev = dev2udev(tp->t_dev); XT_COPY(state); XT_COPY(flags); XT_COPY(timeout); if (tp->t_pgrp != NULL) xt.xt_pgid = tp->t_pgrp->pg_id; if (tp->t_session != NULL) xt.xt_sid = tp->t_session->s_sid; XT_COPY(termios); XT_COPY(winsize); XT_COPY(column); XT_COPY(rocount); XT_COPY(rocol); XT_COPY(ififosize); XT_COPY(ihiwat); XT_COPY(ilowat); XT_COPY(ispeedwat); XT_COPY(ohiwat); XT_COPY(olowat); XT_COPY(ospeedwat); #undef XT_COPY error = SYSCTL_OUT(req, &xt, sizeof xt); if (error != 0) { ttyrel(tp); return (error); } mtx_lock(&tty_list_mutex); tp2 = TAILQ_NEXT(tp, t_list); if (tp2 != NULL) ttyref(tp2); mtx_unlock(&tty_list_mutex); ttyrel(tp); tp = tp2; } return (0); } SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD, 0, 0, sysctl_kern_ttys, "S,xtty", "All ttys"); SYSCTL_LONG(_kern, OID_AUTO, tty_nin, CTLFLAG_RD, &tk_nin, 0, "Total TTY in characters"); SYSCTL_LONG(_kern, OID_AUTO, tty_nout, CTLFLAG_RD, &tk_nout, 0, "Total TTY out characters"); void nottystop(struct tty *tp, int rw) { return; } int ttyopen(struct cdev *dev, int flag, int mode, struct thread *td) { int error; int s; struct tty *tp; tp = dev->si_tty; s = spltty(); /* * We jump to this label after all non-interrupted sleeps to pick * up any changes of the device state. */ open_top: if (tp->t_state & TS_GONE) return (ENXIO); error = ttydtrwaitsleep(tp); if (error) goto out; if (tp->t_state & TS_ISOPEN) { /* * The device is open, so everything has been initialized. * Handle conflicts. */ if (ISCALLOUT(dev) && !tp->t_actout) return (EBUSY); if (tp->t_actout && !ISCALLOUT(dev)) { if (flag & O_NONBLOCK) return (EBUSY); error = tsleep(&tp->t_actout, TTIPRI | PCATCH, "siobi", 0); if (error != 0 || (tp->t_flags & TS_GONE)) goto out; goto open_top; } if (tp->t_state & TS_XCLUDE && suser(td)) return (EBUSY); } else { /* * The device isn't open, so there are no conflicts. * Initialize it. Initialization is done twice in many * cases: to preempt sleeping callin opens if we are * callout, and to complete a callin open after DCD rises. */ tp->t_termios = ISCALLOUT(dev) ? tp->t_init_out : tp->t_init_in; tp->t_cflag = tp->t_termios.c_cflag; tp->t_modem(tp, SER_DTR | SER_RTS, 0); ++tp->t_wopeners; error = tp->t_param(tp, &tp->t_termios); --tp->t_wopeners; if (error == 0 && tp->t_open != NULL) error = tp->t_open(tp, dev); if (error != 0) goto out; if (ISCALLOUT(dev) || (tp->t_modem(tp, 0, 0) & SER_DCD)) ttyld_modem(tp, 1); } /* * Wait for DCD if necessary. */ if (!(tp->t_state & TS_CARR_ON) && !ISCALLOUT(dev) && !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) { ++tp->t_wopeners; error = tsleep(TSA_CARR_ON(tp), TTIPRI | PCATCH, "ttydcd", 0); --tp->t_wopeners; if (error != 0 || (tp->t_state & TS_GONE)) goto out; goto open_top; } error = ttyld_open(tp, dev); ttyldoptim(tp); if (tp->t_state & TS_ISOPEN && ISCALLOUT(dev)) tp->t_actout = TRUE; out: splx(s); if (!(tp->t_state & TS_ISOPEN) && tp->t_wopeners == 0 && tp->t_close != NULL) tp->t_close(tp); return (error); } int ttyclose(struct cdev *dev, int flag, int mode, struct thread *td) { struct tty *tp; tp = dev->si_tty; ttyld_close(tp, flag); ttyldoptim(tp); if (tp->t_close != NULL) tp->t_close(tp); tty_close(tp); tp->t_do_timestamp = 0; if (tp->t_pps != NULL) tp->t_pps->ppsparam.mode = 0; return (0); } int ttyread(struct cdev *dev, struct uio *uio, int flag) { struct tty *tp; tp = tty_gettp(dev); if (tp->t_state & TS_GONE) return (ENODEV); return (ttyld_read(tp, uio, flag)); } int ttywrite(struct cdev *dev, struct uio *uio, int flag) { struct tty *tp; tp = tty_gettp(dev); if (tp->t_state & TS_GONE) return (ENODEV); return (ttyld_write(tp, uio, flag)); } int ttyioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) { struct tty *tp; int error; tp = dev->si_tty; if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { int cc; struct termios *dt = (struct termios *)data; struct termios *lt = ISCALLOUT(dev) ? &tp->t_lock_out : &tp->t_lock_in; dt->c_iflag = (tp->t_iflag & lt->c_iflag) | (dt->c_iflag & ~lt->c_iflag); dt->c_oflag = (tp->t_oflag & lt->c_oflag) | (dt->c_oflag & ~lt->c_oflag); dt->c_cflag = (tp->t_cflag & lt->c_cflag) | (dt->c_cflag & ~lt->c_cflag); dt->c_lflag = (tp->t_lflag & lt->c_lflag) | (dt->c_lflag & ~lt->c_lflag); for (cc = 0; cc < NCCS; ++cc) if (lt->c_cc[cc] != 0) dt->c_cc[cc] = tp->t_cc[cc]; if (lt->c_ispeed != 0) dt->c_ispeed = tp->t_ispeed; if (lt->c_ospeed != 0) dt->c_ospeed = tp->t_ospeed; } error = ttyld_ioctl(tp, cmd, data, flag, td); if (error == ENOIOCTL) error = ttioctl(tp, cmd, data, flag); ttyldoptim(tp); if (error != ENOIOCTL) return (error); return (ENOTTY); } void ttyldoptim(struct tty *tp) { struct termios *t; t = &tp->t_termios; if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON)) && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK)) && (!(t->c_iflag & PARMRK) || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK)) && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN)) && linesw[tp->t_line]->l_rint == ttyinput) tp->t_state |= TS_CAN_BYPASS_L_RINT; else tp->t_state &= ~TS_CAN_BYPASS_L_RINT; } static void ttydtrwaitwakeup(void *arg) { struct tty *tp; tp = arg; tp->t_state &= ~TS_DTR_WAIT; wakeup(&tp->t_dtr_wait); } void ttydtrwaitstart(struct tty *tp) { if (tp->t_dtr_wait == 0) return; if (tp->t_state & TS_DTR_WAIT) return; timeout(ttydtrwaitwakeup, tp, tp->t_dtr_wait); tp->t_state |= TS_DTR_WAIT; } int ttydtrwaitsleep(struct tty *tp) { int error; error = 0; while (error == 0) { if (tp->t_state & TS_GONE) error = ENXIO; else if (!(tp->t_state & TS_DTR_WAIT)) break; else error = tsleep(&tp->t_dtr_wait, TTIPRI | PCATCH, "dtrwait", 0); } return (error); } static int ttysopen(struct cdev *dev, int flag, int mode, struct thread *td) { struct tty *tp; tp = dev->si_tty; KASSERT(tp != NULL, ("ttysopen(): no tty pointer on device (%s)", devtoname(dev))); if (tp->t_state & TS_GONE) return (ENODEV); return (0); } static int ttysclose(struct cdev *dev, int flag, int mode, struct thread *td) { return (0); } static int ttysrdwr(struct cdev *dev, struct uio *uio, int flag) { return (ENODEV); } static int ttysioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) { struct tty *tp; int error; struct termios *ct; tp = dev->si_tty; KASSERT(tp != NULL, ("ttysopen(): no tty pointer on device (%s)", devtoname(dev))); if (tp->t_state & TS_GONE) return (ENODEV); ct = dev->si_drv2; switch (cmd) { case TIOCSETA: error = suser(td); if (error != 0) return (error); *ct = *(struct termios *)data; return (0); case TIOCGETA: *(struct termios *)data = *ct; return (0); case TIOCGETD: *(int *)data = TTYDISC; return (0); case TIOCGWINSZ: bzero(data, sizeof(struct winsize)); return (0); default: if (tp->t_cioctl != NULL) return(tp->t_cioctl(dev, cmd, data, flag, td)); return (ENOTTY); } } /* * Initialize a tty to sane modes. */ void ttyinitmode(struct tty *tp, int echo, int speed) { if (speed == 0) speed = TTYDEF_SPEED; tp->t_init_in.c_iflag = TTYDEF_IFLAG; tp->t_init_in.c_oflag = TTYDEF_OFLAG; tp->t_init_in.c_cflag = TTYDEF_CFLAG; if (echo) tp->t_init_in.c_lflag = TTYDEF_LFLAG_ECHO; else tp->t_init_in.c_lflag = TTYDEF_LFLAG_NOECHO; tp->t_init_in.c_ispeed = tp->t_init_in.c_ospeed = speed; termioschars(&tp->t_init_in); tp->t_init_out = tp->t_init_in; tp->t_termios = tp->t_init_in; } /* * Use more "normal" termios paramters for consoles. */ void ttyconsolemode(struct tty *tp, int speed) { if (speed == 0) speed = TTYDEF_SPEED; ttyinitmode(tp, 1, speed); tp->t_init_in.c_cflag |= CLOCAL; tp->t_lock_out.c_cflag = tp->t_lock_in.c_cflag = CLOCAL; tp->t_lock_out.c_ispeed = tp->t_lock_out.c_ospeed = tp->t_lock_in.c_ispeed = tp->t_lock_in.c_ospeed = speed; tp->t_init_out = tp->t_init_in; tp->t_termios = tp->t_init_in; } /* * Record the relationship between the serial ports notion of modem control * signals and the one used in certain ioctls in a way the compiler can enforce * XXX: We should define TIOCM_* in terms of SER_ if we can limit the * XXX: consequences of the #include work that would take. */ CTASSERT(SER_DTR == TIOCM_DTR / 2); CTASSERT(SER_RTS == TIOCM_RTS / 2); CTASSERT(SER_STX == TIOCM_ST / 2); CTASSERT(SER_SRX == TIOCM_SR / 2); CTASSERT(SER_CTS == TIOCM_CTS / 2); CTASSERT(SER_DCD == TIOCM_DCD / 2); CTASSERT(SER_RI == TIOCM_RI / 2); CTASSERT(SER_DSR == TIOCM_DSR / 2);