/* serial.c The serial port communication routines for Unix. Copyright (C) 1991, 1992 Ian Lance Taylor This file is part of the Taylor UUCP package. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. The author of the program may be contacted at ian@airs.com or c/o Infinity Development Systems, P.O. Box 520, Waltham, MA 02254. */ #include "uucp.h" #if USE_RCS_ID const char serial_rcsid[] = "$Id: serial.c,v 1.26 1993/01/07 02:31:53 ian Rel $"; #endif #include "uudefs.h" #include "uuconf.h" #include "system.h" #include "conn.h" #include "sysdep.h" #include #include #if HAVE_SYS_PARAM_H #include #endif #if HAVE_LIMITS_H #include #endif #if HAVE_TLI #if HAVE_TIUSER_H #include #else /* ! HAVE_TIUSER_H */ #if HAVE_XTI_H #include #endif /* HAVE_XTI_H */ #endif /* ! HAVE_TIUSER_H */ #endif /* HAVE_TLI */ #if HAVE_FCNTL_H #include #else #if HAVE_SYS_FILE_H #include #endif #endif #ifndef O_RDONLY #define O_RDONLY 0 #define O_WRONLY 1 #define O_RDWR 2 #endif #ifndef O_NOCTTY #define O_NOCTTY 0 #endif #ifndef FD_CLOEXEC #define FD_CLOEXEC 1 #endif #if HAVE_SYS_IOCTL_H #include #endif #if HAVE_BSD_TTY #include #if HAVE_SYS_SELECT_H #include #endif #endif #if HAVE_TIME_H #if HAVE_SYS_TIME_AND_TIME_H || ! HAVE_BSD_TTY #include #endif #endif #if HAVE_STRIP_BUG && HAVE_BSD_TTY #include #endif #if HAVE_SVR4_LOCKFILES /* Get the right definitions for major and minor. */ #if MAJOR_IN_MKDEV #include #endif /* MAJOR_IN_MKDEV */ #if MAJOR_IN_SYSMACROS #include #endif /* MAJOR_IN_SYSMACROS */ #if ! MAJOR_IN_MKDEV && ! MAJOR_IN_SYSMACROS #ifndef major #define major(i) (((i) >> 8) & 0xff) #endif #ifndef minor #define minor(i) ((i) & 0xff) #endif #endif /* ! MAJOR_IN_MKDEV && ! MAJOR_IN_SYSMACROS */ #endif /* HAVE_SVR4_LOCKFILES */ /* Get definitions for both O_NONBLOCK and O_NDELAY. */ #ifndef O_NDELAY #ifdef FNDELAY #define O_NDELAY FNDELAY #else /* ! defined (FNDELAY) */ #define O_NDELAY 0 #endif /* ! defined (FNDELAY) */ #endif /* ! defined (O_NDELAY) */ #ifndef O_NONBLOCK #ifdef FNBLOCK #define O_NONBLOCK FNBLOCK #else /* ! defined (FNBLOCK) */ #define O_NONBLOCK 0 #endif /* ! defined (FNBLOCK) */ #endif /* ! defined (O_NONBLOCK) */ #if O_NDELAY == 0 && O_NONBLOCK == 0 #error No way to do nonblocking I/O #endif /* Get definitions for EAGAIN, EWOULDBLOCK and ENODATA. */ #ifndef EAGAIN #ifndef EWOULDBLOCK #define EAGAIN (-1) #define EWOULDBLOCK (-1) #else /* defined (EWOULDBLOCK) */ #define EAGAIN EWOULDBLOCK #endif /* defined (EWOULDBLOCK) */ #else /* defined (EAGAIN) */ #ifndef EWOULDBLOCK #define EWOULDBLOCK EAGAIN #endif /* ! defined (EWOULDBLOCK) */ #endif /* defined (EAGAIN) */ #ifndef ENODATA #define ENODATA EAGAIN #endif /* Make sure we have a definition for MAX_INPUT. */ #ifndef MAX_INPUT #define MAX_INPUT (256) #endif /* If we have the TIOCSINUSE ioctl call, we use it to lock a terminal. Otherwise, if we have the TIOCEXCL ioctl call, we have to open the terminal before we know that it is unlocked. */ #ifdef TIOCSINUSE #define HAVE_TIOCSINUSE 1 #else #ifdef TIOCEXCL #define HAVE_TIOCEXCL 1 #endif #endif #if HAVE_TLI extern int t_errno; extern char *t_errlist[]; extern int t_nerr; #endif /* Determine bits to clear for the various terminal control fields for HAVE_SYSV_TERMIO and HAVE_POSIX_TERMIOS. */ #if HAVE_SYSV_TERMIO #define ICLEAR_IFLAG (IGNBRK | BRKINT | IGNPAR | PARMRK | INPCK \ | ISTRIP | INLCR | IGNCR | ICRNL | IUCLC \ | IXON | IXANY | IXOFF) #define ICLEAR_OFLAG (OPOST | OLCUC | ONLCR | OCRNL | ONOCR | ONLRET \ | OFILL | OFDEL | NLDLY | CRDLY | TABDLY | BSDLY \ | VTDLY | FFDLY) #define ICLEAR_CFLAG (CBAUD | CLOCAL | CSIZE | PARENB | PARODD) #define ISET_CFLAG (CS8 | CREAD | HUPCL) #define ICLEAR_LFLAG (ISIG | ICANON | XCASE | ECHO | ECHOE | ECHOK \ | ECHONL | NOFLSH) #endif #if HAVE_POSIX_TERMIOS #ifdef IMAXBEL #define CI_ADD1 IMAXBEL #else #define CI_ADD1 0 #endif #define ICLEAR_IFLAG (BRKINT | ICRNL | IGNBRK | IGNCR | IGNPAR \ | INLCR | INPCK | ISTRIP | IXOFF | IXON \ | PARMRK | CI_ADD1) #define ICLEAR_OFLAG (OPOST) #define ICLEAR_CFLAG (CLOCAL | CSIZE | PARENB | PARODD) #define ISET_CFLAG (CS8 | CREAD | HUPCL) #ifdef PENDIN #define CL_ADD1 PENDIN #else #define CL_ADD1 0 #endif #define ICLEAR_LFLAG (ECHO | ECHOE | ECHOK | ECHONL | ICANON | IEXTEN \ | ISIG | NOFLSH | TOSTOP | CL_ADD1) #endif /* Local functions. */ static RETSIGTYPE usalarm P((int isig)); static boolean fsserial_init P((struct sconnection *qconn, const struct sconncmds *qcmds, const char *zdevice)); static void usserial_free P((struct sconnection *qconn)); static boolean fsserial_lockfile P((boolean flok, const struct sconnection *)); static boolean fsserial_lock P((struct sconnection *qconn, boolean fin)); static boolean fsserial_unlock P((struct sconnection *qconn)); static boolean fsserial_open P((struct sconnection *qconn, long ibaud, boolean fwait)); static boolean fsstdin_open P((struct sconnection *qconn, long ibaud, boolean fwait)); static boolean fsmodem_open P((struct sconnection *qconn, long ibaud, boolean fwait)); static boolean fsdirect_open P((struct sconnection *qconn, long ibaud, boolean fwait)); static boolean fsblock P((struct ssysdep_conn *q, boolean fblock)); static boolean fsserial_close P((struct ssysdep_conn *q)); static boolean fsstdin_close P((struct sconnection *qconn, pointer puuconf, struct uuconf_dialer *qdialer, boolean fsuccess)); static boolean fsmodem_close P((struct sconnection *qconn, pointer puuconf, struct uuconf_dialer *qdialer, boolean fsuccess)); static boolean fsdirect_close P((struct sconnection *qconn, pointer puuconf, struct uuconf_dialer *qdialer, boolean fsuccess)); static boolean fsserial_reset P((struct sconnection *qconn)); static boolean fsstdin_reset P((struct sconnection *qconn)); static boolean fsstdin_read P((struct sconnection *qconn, char *zbuf, size_t *pclen, size_t cmin, int ctimeout, boolean freport)); static boolean fsstdin_write P((struct sconnection *qconn, const char *zwrite, size_t cwrite)); static boolean fsserial_break P((struct sconnection *qconn)); static boolean fsstdin_break P((struct sconnection *qconn)); static boolean fsserial_set P((struct sconnection *qconn, enum tparitysetting tparity, enum tstripsetting tstrip, enum txonxoffsetting txonxoff)); static boolean fsstdin_set P((struct sconnection *qconn, enum tparitysetting tparity, enum tstripsetting tstrip, enum txonxoffsetting txonxoff)); static boolean fsmodem_carrier P((struct sconnection *qconn, boolean fcarrier)); static boolean fsrun_chat P((int oread, int owrite, char **pzprog)); static boolean fsstdin_chat P((struct sconnection *qconn, char **pzprog)); static long isserial_baud P((struct sconnection *qconn)); /* The command table for standard input ports. */ static const struct sconncmds sstdincmds = { usserial_free, NULL, /* pflock */ NULL, /* pfunlock */ fsstdin_open, fsstdin_close, fsstdin_reset, NULL, /* pfdial */ fsstdin_read, fsstdin_write, fsysdep_conn_io, fsstdin_break, fsstdin_set, NULL, /* pfcarrier */ fsstdin_chat, isserial_baud }; /* The command table for modem ports. */ static const struct sconncmds smodemcmds = { usserial_free, fsserial_lock, fsserial_unlock, fsmodem_open, fsmodem_close, fsserial_reset, fmodem_dial, fsysdep_conn_read, fsysdep_conn_write, fsysdep_conn_io, fsserial_break, fsserial_set, fsmodem_carrier, fsysdep_conn_chat, isserial_baud }; /* The command table for direct ports. */ static const struct sconncmds sdirectcmds = { usserial_free, fsserial_lock, fsserial_unlock, fsdirect_open, fsdirect_close, fsserial_reset, NULL, /* pfdial */ fsysdep_conn_read, fsysdep_conn_write, fsysdep_conn_io, fsserial_break, fsserial_set, NULL, /* pfcarrier */ fsysdep_conn_chat, isserial_baud }; /* If the system will let us set both O_NDELAY and O_NONBLOCK, we do so. This is because some ancient drivers on some systems appear to look for one but not the other. Some other systems will give an EINVAL error if we attempt to set both, so we use a static global to hold the value we want to set. If we get EINVAL, we change the global and try again (if some system gives an error other than EINVAL, the code will have to be modified). */ static int iSunblock = O_NDELAY | O_NONBLOCK; /* This code handles SIGALRM. See the discussion above fsysdep_conn_read. Normally we ignore SIGALRM, but the handler will temporarily be set to this function, which should set fSalarm and then either longjmp or schedule another SIGALRM. fSalarm is never referred to outside of this file, but we don't make it static to try to fool compilers which don't understand volatile. */ volatile sig_atomic_t fSalarm; static RETSIGTYPE usalarm (isig) int isig; { #if ! HAVE_SIGACTION && ! HAVE_SIGVEC && ! HAVE_SIGSET (void) signal (isig, usalarm); #endif fSalarm = TRUE; #if HAVE_RESTARTABLE_SYSCALLS longjmp (sSjmp_buf, 1); #else alarm (1); #endif } /* We need a simple routine to block SIGINT, SIGQUIT, SIGTERM and SIGPIPE and another to restore the original state. When these functions are called (in fsysdep_modem_close) SIGHUP is being ignored. The routines are isblocksigs, which returns a value of type HELD_SIG_MASK and usunblocksigs which takes a single argument of type HELD_SIG_MASK. */ #if HAVE_SIGPROCMASK /* Use the POSIX sigprocmask call. */ #define HELD_SIG_MASK sigset_t static sigset_t isblocksigs P((void)); static sigset_t isblocksigs () { sigset_t sblock, sold; /* These expressions need an extra set of parentheses to avoid a bug in SCO 3.2.2. */ (void) (sigemptyset (&sblock)); (void) (sigaddset (&sblock, SIGINT)); (void) (sigaddset (&sblock, SIGQUIT)); (void) (sigaddset (&sblock, SIGTERM)); (void) (sigaddset (&sblock, SIGPIPE)); (void) sigprocmask (SIG_BLOCK, &sblock, &sold); return sold; } #define usunblocksigs(s) \ ((void) sigprocmask (SIG_SETMASK, &(s), (sigset_t *) NULL)) #else /* ! HAVE_SIGPROCMASK */ #if HAVE_SIGBLOCK /* Use the BSD sigblock and sigsetmask calls. */ #define HELD_SIG_MASK int #ifndef sigmask #define sigmask(i) (1 << ((i) - 1)) #endif #define isblocksigs() \ sigblock (sigmask (SIGINT) | sigmask (SIGQUIT) \ | sigmask (SIGTERM) | sigmask (SIGPIPE)) #define usunblocksigs(i) ((void) sigsetmask (i)) #else /* ! HAVE_SIGBLOCK */ #if HAVE_SIGHOLD /* Use the SVR3 sighold and sigrelse calls. */ #define HELD_SIG_MASK int static int isblocksigs P((void)); static int isblocksigs () { sighold (SIGINT); sighold (SIGQUIT); sighold (SIGTERM); sighold (SIGPIPE); return 0; } static void usunblocksigs P((int)); /*ARGSUSED*/ static void usunblocksigs (i) int i; { sigrelse (SIGINT); sigrelse (SIGQUIT); sigrelse (SIGTERM); sigrelse (SIGPIPE); } #else /* ! HAVE_SIGHOLD */ /* We have no way to block signals. This system will suffer from a race condition in fsysdep_modem_close. */ #define HELD_SIG_MASK int #define isblocksigs() 0 #define usunblocksigs(i) #endif /* ! HAVE_SIGHOLD */ #endif /* ! HAVE_SIGBLOCK */ #endif /* ! HAVE_SIGPROCMASK */ /* Initialize a connection for use on a serial port. */ static boolean fsserial_init (qconn, qcmds, zdevice) struct sconnection *qconn; const struct sconncmds *qcmds; const char *zdevice; { struct ssysdep_conn *q; q = (struct ssysdep_conn *) xmalloc (sizeof (struct ssysdep_conn)); if (zdevice == NULL && qconn->qport != NULL && qconn->qport->uuconf_ttype != UUCONF_PORTTYPE_STDIN) zdevice = qconn->qport->uuconf_zname; if (zdevice == NULL) q->zdevice = NULL; else if (*zdevice == '/') q->zdevice = zbufcpy (zdevice); else { size_t clen; clen = strlen (zdevice); q->zdevice = zbufalc (sizeof "/dev/" + clen); memcpy (q->zdevice, "/dev/", sizeof "/dev/" - 1); memcpy (q->zdevice + sizeof "/dev/" - 1, zdevice, clen); q->zdevice[sizeof "/dev/" + clen - 1] = '\0'; } q->o = -1; q->ftli = FALSE; qconn->psysdep = (pointer) q; qconn->qcmds = qcmds; return TRUE; } /* Initialize a connection for use on standard input. */ boolean fsysdep_stdin_init (qconn) struct sconnection *qconn; { return fsserial_init (qconn, &sstdincmds, (const char *) NULL); } /* Initialize a connection for use on a modem port. */ boolean fsysdep_modem_init (qconn) struct sconnection *qconn; { return fsserial_init (qconn, &smodemcmds, qconn->qport->uuconf_u.uuconf_smodem.uuconf_zdevice); } /* Initialize a connection for use on a direct port. */ boolean fsysdep_direct_init (qconn) struct sconnection *qconn; { return fsserial_init (qconn, &sdirectcmds, qconn->qport->uuconf_u.uuconf_sdirect.uuconf_zdevice); } /* Free up a serial port. */ static void usserial_free (qconn) struct sconnection *qconn; { struct ssysdep_conn *qsysdep; qsysdep = (struct ssysdep_conn *) qconn->psysdep; ubuffree (qsysdep->zdevice); xfree ((pointer) qsysdep); qconn->psysdep = NULL; } /* This routine is used for both locking and unlocking. It is the only routine which knows how to translate a device name into the name of a lock file. If it can't figure out a name, it does nothing and returns TRUE. */ static boolean fsserial_lockfile (flok, qconn) boolean flok; const struct sconnection *qconn; { struct ssysdep_conn *qsysdep; const char *z; char *zalc; boolean fret; qsysdep = (struct ssysdep_conn *) qconn->psysdep; if (qconn->qport == NULL) z = NULL; else z = qconn->qport->uuconf_zlockname; zalc = NULL; if (z == NULL) { #if ! HAVE_SVR4_LOCKFILES { const char *zbase; size_t clen; zbase = strrchr (qsysdep->zdevice, '/') + 1; clen = strlen (zbase); zalc = zbufalc (sizeof "LCK.." + clen); memcpy (zalc, "LCK..", sizeof "LCK.." - 1); memcpy (zalc + sizeof "LCK.." - 1, zbase, clen + 1); #if HAVE_SCO_LOCKFILES { char *zl; for (zl = zalc + sizeof "LCK.." - 1; *zl != '\0'; zl++) if (isupper (*zl)) *zl = tolower (*zl); } #endif z = zalc; } #else /* ! HAVE_SVR4_LOCKFILES */ #if HAVE_SVR4_LOCKFILES { struct stat s; if (stat (qsysdep->zdevice, &s) != 0) { ulog (LOG_ERROR, "stat (%s): %s", qsysdep->zdevice, strerror (errno)); return FALSE; } zalc = zbufalc (sizeof "LK.123.123.123"); sprintf (zalc, "LK.%03d.%03d.%03d", major (s.st_dev), major (s.st_rdev), minor (s.st_rdev)); z = zalc; } #else /* ! HAVE_SVR4_LOCKFILES */ z = strrchr (qsysdep->zdevice, '/') + 1; #endif /* ! HAVE_SVR4_LOCKFILES */ #endif /* ! HAVE_SVR4_LOCKFILES */ } if (flok) fret = fsdo_lock (z, FALSE, (boolean *) NULL); else fret = fsdo_unlock (z, FALSE); #if HAVE_COHERENT_LOCKFILES if (fret) { if (flok) { if (lockttyexist (z)) { ulog (LOG_NORMAL, "%s: port already locked", z+5); fret = FALSE; } else fret = !(fscoherent_disable_tty (z, &qsysdep->zenable)); } else { fret = TRUE; if (qsysdep->zenable != NULL) { const char *azargs[3]; int aidescs[3]; pid_t ipid; azargs[0] = "/etc/enable"; azargs[1] = qsysdep->zenable; azargs[2] = NULL; aidescs[0] = SPAWN_NULL; aidescs[1] = SPAWN_NULL; aidescs[2] = SPAWN_NULL; ipid = ixsspawn (azargs, aidescs, TRUE, FALSE, (const char *) NULL, TRUE, TRUE, (const char *) NULL, (const char *) NULL, (const char *) NULL); if (ipid < 0) { ulog (LOG_ERROR, "ixsspawn (/etc/enable %s): %s", qsysdep->zenable, strerror (errno)); fret = FALSE; } else { if (ixswait ((unsigned long) ipid, (const char *) NULL) == 0) fret = TRUE; else fret = FALSE; } ubuffree (qsysdep->zenable); qsysdep->zenable = NULL; } } } #endif /* HAVE_COHERENT_LOCKFILES */ ubuffree (zalc); return fret; } /* If we can mark a modem line in use, then when we lock a port we must open it and mark it in use. We can't wait until the actual open because we can't fail out if it is locked then. */ static boolean fsserial_lock (qconn, fin) struct sconnection *qconn; boolean fin; { if (! fsserial_lockfile (TRUE, qconn)) return FALSE; #if HAVE_TIOCSINUSE || HAVE_TIOCEXCL /* Open the line and try to mark it in use. */ { struct ssysdep_conn *qsysdep; int iflag; qsysdep = (struct ssysdep_conn *) qconn->psysdep; if (fin) iflag = 0; else iflag = iSunblock; qsysdep->o = open (qsysdep->zdevice, O_RDWR | iflag); if (qsysdep->o < 0) { #if O_NONBLOCK != 0 if (! fin && iSunblock != O_NONBLOCK && errno == EINVAL) { iSunblock = O_NONBLOCK; qsysdep->o = open (qsysdep->zdevice, O_RDWR | O_NONBLOCK); } #endif if (qsysdep->o < 0) { if (errno != EBUSY) ulog (LOG_ERROR, "open (%s): %s", qsysdep->zdevice, strerror (errno)); (void) fsserial_lockfile (FALSE, qconn); return FALSE; } } #if HAVE_TIOCSINUSE /* If we can't mark it in use, return FALSE to indicate that the lock failed. */ if (ioctl (qsysdep->o, TIOCSINUSE, 0) < 0) { if (errno != EALREADY) ulog (LOG_ERROR, "ioctl (TIOCSINUSE): %s", strerror (errno)); #ifdef TIOCNOTTY (void) ioctl (qsysdep->o, TIOCNOTTY, (char *) NULL); #endif (void) close (qsysdep->o); qsysdep->o = -1; (void) fsserial_lockfile (FALSE, qconn); return FALSE; } #endif if (fcntl (qsysdep->o, F_SETFD, fcntl (qsysdep->o, F_GETFD, 0) | FD_CLOEXEC) < 0) { ulog (LOG_ERROR, "fcntl (FD_CLOEXEC): %s", strerror (errno)); #ifdef TIOCNOTTY (void) ioctl (qsysdep->o, TIOCNOTTY, (char *) NULL); #endif (void) close (qsysdep->o); qsysdep->o = -1; (void) fsserial_lockfile (FALSE, qconn); return FALSE; } #ifdef TIOCSCTTY /* On BSD 4.4, make it our controlling terminal. */ (void) ioctl (qsysdep->o, TIOCSCTTY, 0); #endif } #endif /* HAVE_TIOCSINUSE || HAVE_TIOCEXCL */ return TRUE; } /* Unlock a modem or direct port. */ static boolean fsserial_unlock (qconn) struct sconnection *qconn; { boolean fret; struct ssysdep_conn *qsysdep; fret = TRUE; /* The file may have been opened by fsserial_lock, so close it here if necessary. */ qsysdep = (struct ssysdep_conn *) qconn->psysdep; if (qsysdep->o >= 0) { #ifdef TIOCNOTTY (void) ioctl (qsysdep->o, TIOCNOTTY, (char *) NULL); #endif if (close (qsysdep->o) < 0) { ulog (LOG_ERROR, "close: %s", strerror (errno)); fret = FALSE; } qsysdep->o = -1; } if (! fsserial_lockfile (FALSE, qconn)) fret = FALSE; return fret; } /* Open a serial line. This sets the terminal settings. We begin in seven bit mode and let the protocol change if necessary. */ #if HAVE_POSIX_TERMIOS typedef speed_t baud_code; #else typedef int baud_code; #endif static struct sbaud_table { baud_code icode; long ibaud; } asSbaud_table[] = { { B50, 50 }, { B75, 75 }, { B110, 110 }, { B134, 134 }, { B150, 150 }, { B200, 200 }, { B300, 300 }, { B600, 600 }, { B1200, 1200 }, { B1800, 1800 }, { B2400, 2400 }, { B4800, 4800 }, { B9600, 9600 }, #ifdef B19200 { B19200, 19200 }, #else /* ! defined (B19200) */ #ifdef EXTA { EXTA, 19200 }, #endif /* EXTA */ #endif /* ! defined (B19200) */ #ifdef B38400 { B38400, 38400 }, #else /* ! defined (B38400) */ #ifdef EXTB { EXTB, 38400 }, #endif /* EXTB */ #endif /* ! defined (B38400) */ #ifdef B57600 { B57600, 57600 }, #endif #ifdef B76800 { B76800, 76800 }, #endif #ifdef B115200 { B115200, 115200 }, #endif { B0, 0 } }; #define CBAUD_TABLE (sizeof asSbaud_table / sizeof asSbaud_table[0]) #if HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS /* Hold the MIN value for the terminal to avoid setting it unnecessarily. */ static int cSmin; #endif /* HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS */ static boolean fsserial_open (qconn, ibaud, fwait) struct sconnection *qconn; long ibaud; boolean fwait; { struct ssysdep_conn *q; baud_code ib; q = (struct ssysdep_conn *) qconn->psysdep; if (q->zdevice != NULL) ulog_device (strrchr (q->zdevice, '/') + 1); else { const char *zport; boolean fdummy; #if DEBUG > 0 if (qconn->qport != NULL && qconn->qport->uuconf_ttype != UUCONF_PORTTYPE_STDIN) ulog (LOG_FATAL, "fsserial_open: Can't happen"); #endif zport = zsysdep_port_name (&fdummy); if (zport != NULL) ulog_device (zport); } ib = B0; if (ibaud != 0) { int i; for (i = 0; i < CBAUD_TABLE; i++) if (asSbaud_table[i].ibaud == ibaud) break; if (i >= CBAUD_TABLE) { ulog (LOG_ERROR, "Unsupported baud rate %ld", ibaud); return FALSE; } ib = asSbaud_table[i].icode; } /* The port may have already been opened by the locking routine. */ if (q->o < 0) { int iflag; if (fwait) iflag = 0; else iflag = iSunblock; q->o = open (q->zdevice, O_RDWR | iflag); if (q->o < 0) { #if O_NONBLOCK != 0 if (! fwait && iSunblock != O_NONBLOCK && errno == EINVAL) { iSunblock = O_NONBLOCK; q->o = open (q->zdevice, O_RDWR | O_NONBLOCK); } #endif if (q->o < 0) { ulog (LOG_ERROR, "open (%s): %s", q->zdevice, strerror (errno)); return FALSE; } } if (fcntl (q->o, F_SETFD, fcntl (q->o, F_GETFD, 0) | FD_CLOEXEC) < 0) { ulog (LOG_ERROR, "fcntl (FD_CLOEXEC): %s", strerror (errno)); return FALSE; } } /* Get the port flags, and make sure the ports are blocking. */ q->iflags = fcntl (q->o, F_GETFL, 0); if (q->iflags < 0) { ulog (LOG_ERROR, "fcntl: %s", strerror (errno)); return FALSE; } q->istdout_flags = -1; if (! fgetterminfo (q->o, &q->sorig)) { q->fterminal = FALSE; return TRUE; } q->fterminal = TRUE; q->snew = q->sorig; #if HAVE_BSD_TTY q->snew.stty.sg_flags = RAW | ANYP; if (ibaud == 0) ib = q->snew.stty.sg_ospeed; else { q->snew.stty.sg_ispeed = ib; q->snew.stty.sg_ospeed = ib; } /* We don't want to receive any interrupt characters. */ q->snew.stchars.t_intrc = -1; q->snew.stchars.t_quitc = -1; q->snew.stchars.t_eofc = -1; q->snew.stchars.t_brkc = -1; q->snew.sltchars.t_suspc = -1; q->snew.sltchars.t_rprntc = -1; q->snew.sltchars.t_dsuspc = -1; q->snew.sltchars.t_flushc = -1; q->snew.sltchars.t_werasc = -1; q->snew.sltchars.t_lnextc = -1; #ifdef NTTYDISC /* We want to use the ``new'' terminal driver so that we can use the local mode bits to control XON/XOFF. */ { int iparam; if (ioctl (q->o, TIOCGETD, &iparam) >= 0 && iparam != NTTYDISC) { iparam = NTTYDISC; (void) ioctl (q->o, TIOCSETD, &iparam); } } #endif #ifdef TIOCHPCL /* When the file is closed, hang up the line. This is a safety measure in case the program crashes. */ (void) ioctl (q->o, TIOCHPCL, 0); #endif #ifdef TIOCFLUSH { int iparam; /* Flush pending input. */ #ifdef FREAD iparam = FREAD; #else iparam = 0; #endif (void) ioctl (q->o, TIOCFLUSH, &iparam); } #endif /* TIOCFLUSH */ #endif /* HAVE_BSD_TTY */ #if HAVE_SYSV_TERMIO if (ibaud == 0) ib = q->snew.c_cflag & CBAUD; q->snew.c_iflag &=~ ICLEAR_IFLAG; q->snew.c_oflag &=~ ICLEAR_OFLAG; q->snew.c_cflag &=~ ICLEAR_CFLAG; if (!fwait) q->snew.c_cflag |= CLOCAL; q->snew.c_cflag |= (ib | ISET_CFLAG); q->snew.c_lflag &=~ ICLEAR_LFLAG; cSmin = 1; q->snew.c_cc[VMIN] = cSmin; q->snew.c_cc[VTIME] = 1; #ifdef TCFLSH /* Flush pending input. */ (void) ioctl (q->o, TCFLSH, 0); #endif #endif /* HAVE_SYSV_TERMIO */ #if HAVE_POSIX_TERMIOS if (ibaud == 0) ib = cfgetospeed (&q->snew); q->snew.c_iflag &=~ ICLEAR_IFLAG; q->snew.c_oflag &=~ ICLEAR_OFLAG; q->snew.c_cflag &=~ ICLEAR_CFLAG; if (!fwait) q->snew.c_cflag |= CLOCAL; q->snew.c_cflag |= ISET_CFLAG; q->snew.c_lflag &=~ ICLEAR_LFLAG; cSmin = 1; q->snew.c_cc[VMIN] = cSmin; q->snew.c_cc[VTIME] = 1; (void) cfsetospeed (&q->snew, ib); (void) cfsetispeed (&q->snew, ib); /* Flush pending input. */ (void) tcflush (q->o, TCIFLUSH); #endif /* HAVE_POSIX_TERMIOS */ if (! fsetterminfo (q->o, &q->snew)) { ulog (LOG_ERROR, "Can't set terminal settings: %s", strerror (errno)); return FALSE; } #ifdef TIOCSCTTY /* On BSD 4.4, make it our controlling terminal. */ (void) ioctl (q->o, TIOCSCTTY, 0); #endif if (ibaud != 0) q->ibaud = ibaud; else { int i; q->ibaud = (long) 1200; for (i = 0; i < CBAUD_TABLE; i++) { if (asSbaud_table[i].icode == ib) { q->ibaud = asSbaud_table[i].ibaud; break; } } DEBUG_MESSAGE1 (DEBUG_PORT, "fsserial_open: Baud rate is %ld", q->ibaud); } return TRUE; } /* Open a standard input port. The code alternates q->o between 0 and 1 as appropriate. It is always 0 before any call to fsblock. */ static boolean fsstdin_open (qconn, ibaud, fwait) struct sconnection *qconn; long ibaud; boolean fwait; { struct ssysdep_conn *q; q = (struct ssysdep_conn *) qconn->psysdep; q->o = 0; if (! fsserial_open (qconn, ibaud, fwait)) return FALSE; q->istdout_flags = fcntl (1, F_GETFL, 0); if (q->istdout_flags < 0) { ulog (LOG_ERROR, "fcntl: %s", strerror (errno)); return FALSE; } return TRUE; } /* Open a modem port. */ static boolean fsmodem_open (qconn, ibaud, fwait) struct sconnection *qconn; long ibaud; boolean fwait; { if (ibaud == (long) 0) ibaud = qconn->qport->uuconf_u.uuconf_smodem.uuconf_ibaud; return fsserial_open (qconn, ibaud, fwait); } /* Open a direct port. */ static boolean fsdirect_open (qconn, ibaud, fwait) struct sconnection *qconn; long ibaud; boolean fwait; { if (ibaud == (long) 0) ibaud = qconn->qport->uuconf_u.uuconf_sdirect.uuconf_ibaud; return fsserial_open (qconn, ibaud, fwait); } /* Change the blocking status of the port. We keep track of the current blocking status to avoid calling fcntl unnecessarily; fcntl turns out to be surprisingly expensive, at least on Ultrix. */ static boolean fsblock (qs, fblock) struct ssysdep_conn *qs; boolean fblock; { int iwant; int isys; if (fblock) iwant = qs->iflags &~ (O_NDELAY | O_NONBLOCK); else iwant = qs->iflags | iSunblock; if (iwant == qs->iflags) return TRUE; isys = fcntl (qs->o, F_SETFL, iwant); if (isys < 0) { #if O_NONBLOCK != 0 if (! fblock && iSunblock != O_NONBLOCK && errno == EINVAL) { iSunblock = O_NONBLOCK; iwant = qs->iflags | O_NONBLOCK; isys = fcntl (qs->o, F_SETFL, iwant); } #endif if (isys < 0) { ulog (LOG_ERROR, "fcntl: %s", strerror (errno)); return FALSE; } } qs->iflags = iwant; if (qs->istdout_flags >= 0) { if (fblock) iwant = qs->istdout_flags &~ (O_NDELAY | O_NONBLOCK); else iwant = qs->istdout_flags | iSunblock; if (fcntl (1, F_SETFL, iwant) < 0) { /* We don't bother to fix up iSunblock here, since we succeeded above. */ ulog (LOG_ERROR, "fcntl: %s", strerror (errno)); return FALSE; } qs->istdout_flags = iwant; } return TRUE; } /* Close a serial port. */ static boolean fsserial_close (q) struct ssysdep_conn *q; { if (q->o >= 0) { /* Use a 30 second timeout to avoid hanging while draining output. */ if (q->fterminal) { fSalarm = FALSE; if (fsysdep_catch ()) { usysdep_start_catch (); usset_signal (SIGALRM, usalarm, TRUE, (boolean *) NULL); (void) alarm (30); (void) fsetterminfodrain (q->o, &q->sorig); } usset_signal (SIGALRM, SIG_IGN, TRUE, (boolean *) NULL); (void) alarm (0); usysdep_end_catch (); /* If we timed out, use the non draining call. Hopefully this can't hang. */ if (fSalarm) (void) fsetterminfo (q->o, &q->sorig); } #ifdef TIOCNOTTY /* We don't want this as our controlling terminal any more, so get rid of it. This is necessary because we don't want to open /dev/tty, since that can confuse the serial port locking on some computers. */ (void) ioctl (q->o, TIOCNOTTY, (char *) NULL); #endif (void) close (q->o); q->o = -1; /* Sleep to give the terminal a chance to settle, in case we are about to call out again. */ sleep (2); } return TRUE; } /* Close a stdin port. */ /*ARGSUSED*/ static boolean fsstdin_close (qconn, puuconf, qdialer, fsuccess) struct sconnection *qconn; pointer puuconf; struct uuconf_dialer *qdialer; boolean fsuccess; { struct ssysdep_conn *qsysdep; qsysdep = (struct ssysdep_conn *) qconn->psysdep; (void) close (1); (void) close (2); qsysdep->o = 0; return fsserial_close (qsysdep); } /* Close a modem port. */ static boolean fsmodem_close (qconn, puuconf, qdialer, fsuccess) struct sconnection *qconn; pointer puuconf; struct uuconf_dialer *qdialer; boolean fsuccess; { struct ssysdep_conn *qsysdep; boolean fret; struct uuconf_dialer sdialer; const struct uuconf_chat *qchat; qsysdep = (struct ssysdep_conn *) qconn->psysdep; fret = TRUE; /* Figure out the dialer so that we can run the complete or abort chat scripts. */ if (qdialer == NULL) { if (qconn->qport->uuconf_u.uuconf_smodem.uuconf_pzdialer != NULL) { const char *zdialer; int iuuconf; zdialer = qconn->qport->uuconf_u.uuconf_smodem.uuconf_pzdialer[0]; iuuconf = uuconf_dialer_info (puuconf, zdialer, &sdialer); if (iuuconf == UUCONF_SUCCESS) qdialer = &sdialer; else { ulog_uuconf (LOG_ERROR, puuconf, iuuconf); fret = FALSE; } } else qdialer = qconn->qport->uuconf_u.uuconf_smodem.uuconf_qdialer; } /* Get the complete or abort chat script to use. */ qchat = NULL; if (qdialer != NULL) { if (fsuccess) qchat = &qdialer->uuconf_scomplete; else qchat = &qdialer->uuconf_sabort; } if (qchat != NULL && (qchat->uuconf_pzprogram != NULL || qchat->uuconf_pzchat != NULL)) { boolean fsighup_ignored; HELD_SIG_MASK smask; int i; sig_atomic_t afhold[INDEXSIG_COUNT]; /* We're no longer interested in carrier. */ (void) fsmodem_carrier (qconn, FALSE); /* The port I/O routines check whether any signal has been received, and abort if one has. While we are closing down the modem, we don't care if we received a signal in the past, but we do care if we receive a new signal (otherwise it would be difficult to kill a uucico which was closing down a modem). We never care if we get SIGHUP at this point. So we turn off SIGHUP, remember what signals we've already seen, and clear our notion of what signals we've seen. We have to block the signals while we remember and clear the array, since we might otherwise miss a signal which occurred between the copy and the clear (old systems can't block signals; they will just have to suffer the race). */ usset_signal (SIGHUP, SIG_IGN, FALSE, &fsighup_ignored); smask = isblocksigs (); for (i = 0; i < INDEXSIG_COUNT; i++) { afhold[i] = afSignal[i]; afSignal[i] = FALSE; } usunblocksigs (smask); if (! fchat (qconn, puuconf, qchat, (const struct uuconf_system *) NULL, (const struct uuconf_dialer *) NULL, (const char *) NULL, FALSE, qconn->qport->uuconf_zname, qsysdep->ibaud)) fret = FALSE; /* Restore the old signal array and the SIGHUP handler. It is not necessary to block signals here, since all we are doing is exactly what the signal handler itself would do if the signal occurred. */ for (i = 0; i < INDEXSIG_COUNT; i++) if (afhold[i]) afSignal[i] = TRUE; if (! fsighup_ignored) usset_signal (SIGHUP, ussignal, TRUE, (boolean *) NULL); } if (qdialer != NULL && qdialer == &sdialer) (void) uuconf_dialer_free (puuconf, &sdialer); #if ! HAVE_RESET_BUG /* Reset the terminal to make sure we drop DTR. It should be dropped when we close the descriptor, but that doesn't seem to happen on some systems. Use a 30 second timeout to avoid hanging while draining output. */ if (qsysdep->fterminal) { #if HAVE_BSD_TTY qsysdep->snew.stty.sg_ispeed = B0; qsysdep->snew.stty.sg_ospeed = B0; #endif #if HAVE_SYSV_TERMIO qsysdep->snew.c_cflag = (qsysdep->snew.c_cflag &~ CBAUD) | B0; #endif #if HAVE_POSIX_TERMIOS (void) cfsetospeed (&qsysdep->snew, B0); #endif fSalarm = FALSE; if (fsysdep_catch ()) { usysdep_start_catch (); usset_signal (SIGALRM, usalarm, TRUE, (boolean *) NULL); (void) alarm (30); (void) fsetterminfodrain (qsysdep->o, &qsysdep->snew); } usset_signal (SIGALRM, SIG_IGN, TRUE, (boolean *) NULL); (void) alarm (0); usysdep_end_catch (); /* Let the port settle. */ sleep (2); } #endif /* ! HAVE_RESET_BUG */ if (! fsserial_close (qsysdep)) fret = FALSE; return fret; } /* Close a direct port. */ /*ARGSUSED*/ static boolean fsdirect_close (qconn, puuconf, qdialer, fsuccess) struct sconnection *qconn; pointer puuconf; struct uuconf_dialer *qdialer; boolean fsuccess; { return fsserial_close ((struct ssysdep_conn *) qconn->psysdep); } /* Reset a serial port by hanging up. */ static boolean fsserial_reset (qconn) struct sconnection *qconn; { struct ssysdep_conn *q; sterminal sbaud; q = (struct ssysdep_conn *) qconn->psysdep; if (! q->fterminal) return TRUE; sbaud = q->snew; #if HAVE_BSD_TTY sbaud.stty.sg_ispeed = B0; sbaud.stty.sg_ospeed = B0; #endif #if HAVE_SYSV_TERMIO sbaud.c_cflag = (sbaud.c_cflag &~ CBAUD) | B0; #endif #if HAVE_POSIX_TERMIOS if (cfsetospeed (&sbaud, B0) < 0) { ulog (LOG_ERROR, "Can't set baud rate: %s", strerror (errno)); return FALSE; } #endif if (! fsetterminfodrain (q->o, &sbaud)) { ulog (LOG_ERROR, "Can't hangup terminal: %s", strerror (errno)); return FALSE; } /* Give the terminal a chance to settle. */ sleep (2); if (! fsetterminfo (q->o, &q->snew)) { ulog (LOG_ERROR, "Can't reopen terminal: %s", strerror (errno)); return FALSE; } return TRUE; } /* Reset a standard input port. */ static boolean fsstdin_reset (qconn) struct sconnection *qconn; { struct ssysdep_conn *qsysdep; qsysdep = (struct ssysdep_conn *) qconn->psysdep; qsysdep->o = 0; return fsserial_reset (qconn); } /* Begin dialing out on a modem port. This opens the dialer device if there is one. */ boolean fsysdep_modem_begin_dial (qconn, qdial) struct sconnection *qconn; struct uuconf_dialer *qdial; { struct ssysdep_conn *qsysdep; const char *z; qsysdep = (struct ssysdep_conn *) qconn->psysdep; #ifdef TIOCMODEM /* If we can tell the modem to obey modem control, do so. */ { int iperm; iperm = 0; (void) ioctl (qsysdep->o, TIOCMODEM, &iperm); } #endif /* TIOCMODEM */ /* If we supposed to toggle DTR, do so. */ if (qdial->uuconf_fdtr_toggle) { #ifdef TIOCCDTR (void) ioctl (qsysdep->o, TIOCCDTR, 0); sleep (2); (void) ioctl (qsysdep->o, TIOCSDTR, 0); #else /* ! defined (TIOCCDTR) */ (void) fconn_reset (qconn); #endif /* ! defined (TIOCCDTR) */ if (qdial->uuconf_fdtr_toggle_wait) sleep (2); } if (! fsmodem_carrier (qconn, FALSE)) return FALSE; /* Open the dial device if there is one. */ z = qconn->qport->uuconf_u.uuconf_smodem.uuconf_zdial_device; if (z != NULL) { char *zfree; int o; qsysdep->ohold = qsysdep->o; zfree = NULL; if (*z != '/') { zfree = zbufalc (sizeof "/dev/" + strlen (z)); sprintf (zfree, "/dev/%s", z); z = zfree; } o = open ((char *) z, O_RDWR | O_NOCTTY); if (o < 0) { ulog (LOG_ERROR, "open (%s): %s", z, strerror (errno)); ubuffree (zfree); return FALSE; } ubuffree (zfree); if (fcntl (o, F_SETFD, fcntl (o, F_GETFD, 0) | FD_CLOEXEC) < 0) { ulog (LOG_ERROR, "fcntl (FD_CLOEXEC): %s", strerror (errno)); (void) close (o); return FALSE; } qsysdep->o = o; } return TRUE; } /* Tell the port to require or not require carrier. On BSD this uses TIOCCAR and TIOCNCAR, which I assume are generally supported (it can also use the LNOMDM bit supported by IS68K Unix). On System V it resets or sets CLOCAL. We only require carrier if the port supports it. This will only be called with fcarrier TRUE if the dialer supports carrier. */ static boolean fsmodem_carrier (qconn, fcarrier) struct sconnection *qconn; boolean fcarrier; { register struct ssysdep_conn *q; q = (struct ssysdep_conn *) qconn->psysdep; if (! q->fterminal) return TRUE; if (fcarrier) { if (qconn->qport->uuconf_u.uuconf_smodem.uuconf_fcarrier) { #ifdef TIOCCAR /* Tell the modem to pay attention to carrier. */ if (ioctl (q->o, TIOCCAR, 0) < 0) { ulog (LOG_ERROR, "ioctl (TIOCCAR): %s", strerror (errno)); return FALSE; } #endif /* TIOCCAR */ #if HAVE_BSD_TTY #ifdef LNOMDM /* IS68K Unix uses a local LNOMDM bit. */ { int iparam; iparam = LNOMDM; if (ioctl (q->o, TIOCLBIC, &iparam) < 0) { ulog (LOG_ERROR, "ioctl (TIOCLBIC, LNOMDM): %s", strerror (errno)); return FALSE; } } #endif /* LNOMDM */ #endif /* HAVE_BSD_TTY */ #if HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS /* Put the modem into nonlocal mode. */ q->snew.c_cflag &=~ CLOCAL; if (! fsetterminfo (q->o, &q->snew)) { ulog (LOG_ERROR, "Can't clear CLOCAL: %s", strerror (errno)); return FALSE; } #endif /* HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS */ } } else { #ifdef TIOCNCAR /* Tell the modem to ignore carrier. */ if (ioctl (q->o, TIOCNCAR, 0) < 0) { ulog (LOG_ERROR, "ioctl (TIOCNCAR): %s", strerror (errno)); return FALSE; } #endif /* TIOCNCAR */ #if HAVE_BSD_TTY #ifdef LNOMDM /* IS68K Unix uses a local LNOMDM bit. */ { int iparam; iparam = LNOMDM; if (ioctl (q->o, TIOCLBIS, &iparam) < 0) { ulog (LOG_ERROR, "ioctl (TIOCLBIS, LNOMDM): %s", strerror (errno)); return FALSE; } } #endif /* LNOMDM */ #endif /* HAVE_BSD_TTY */ #if HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS /* Put the modem into local mode (ignore carrier) to start the chat script. */ q->snew.c_cflag |= CLOCAL; if (! fsetterminfo (q->o, &q->snew)) { ulog (LOG_ERROR, "Can't set CLOCAL: %s", strerror (errno)); return FALSE; } #if HAVE_CLOCAL_BUG /* On SCO and AT&T UNIX PC you have to reopen the port. */ { int onew; onew = open (q->zdevice, O_RDWR); if (onew < 0) { ulog (LOG_ERROR, "open (%s): %s", q->zdevice, strerror (errno)); return FALSE; } if (fcntl (onew, F_SETFD, fcntl (onew, F_GETFD, 0) | FD_CLOEXEC) < 0) { ulog (LOG_ERROR, "fcntl (FD_CLOEXEC): %s", strerror (errno)); (void) close (onew); return FALSE; } (void) close (q->o); q->o = onew; } #endif /* HAVE_CLOCAL_BUG */ #endif /* HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS */ } return TRUE; } /* Finish dialing out on a modem by closing any dialer device and waiting for carrier. */ boolean fsysdep_modem_end_dial (qconn, qdial) struct sconnection *qconn; struct uuconf_dialer *qdial; { struct ssysdep_conn *q; q = (struct ssysdep_conn *) qconn->psysdep; if (qconn->qport->uuconf_u.uuconf_smodem.uuconf_zdial_device != NULL) { (void) close (q->o); q->o = q->ohold; } if (qconn->qport->uuconf_u.uuconf_smodem.uuconf_fcarrier && qdial->uuconf_fcarrier) { /* Tell the port that we need carrier. */ if (! fsmodem_carrier (qconn, TRUE)) return FALSE; #ifdef TIOCWONLINE /* We know how to wait for carrier, so do so. */ /* If we already got a signal, just quit now. */ if (FGOT_QUIT_SIGNAL ()) return FALSE; /* This bit of code handles signals just like fsysdep_conn_read does. See that function for a longer explanation. */ /* Use fsysdep_catch to handle a longjmp from the signal handler. */ fSalarm = FALSE; if (fsysdep_catch ()) { /* Start catching SIGALRM; normally we ignore it. */ usysdep_start_catch (); usset_signal (SIGALRM, usalarm, TRUE, (boolean *) NULL); (void) alarm (qdial->uuconf_ccarrier_wait); /* We really don't care if we get an error, since that will probably just mean that TIOCWONLINE isn't supported in which case there's nothing we can do anyhow. If we get SIGINT we want to keep waiting for carrier, because SIGINT just means don't start any new sessions. We don't handle SIGINT correctly if we do a longjmp in the signal handler; too bad. */ while (ioctl (q->o, TIOCWONLINE, 0) < 0 && errno == EINTR) { /* Log the signal. */ ulog (LOG_ERROR, (const char *) NULL); if (FGOT_QUIT_SIGNAL () || fSalarm) break; } } /* Turn off the pending SIGALRM and ignore SIGALARM again. */ usset_signal (SIGALRM, SIG_IGN, TRUE, (boolean *) NULL); (void) alarm (0); usysdep_end_catch (); /* If we got a random signal, just return FALSE. */ if (FGOT_QUIT_SIGNAL ()) return FALSE; /* If we timed out, give an error. */ if (fSalarm) { ulog (LOG_ERROR, "Timed out waiting for carrier"); return FALSE; } #endif /* TIOCWONLINE */ } return TRUE; } /* Read data from a connection, with a timeout. This routine handles all types of connections, including TLI. This function should return when we have read cmin characters or the timeout has occurred. We have to work a bit to get Unix to do this efficiently on a terminal. The simple implementation schedules a SIGALRM signal and then calls read; if there is a single character available, the call to read will return immediately, so there must be a loop which terminates when the SIGALRM is delivered or the correct number of characters has been read. This can be very inefficient with a fast CPU or a low baud rate (or both!), since each call to read may return only one or two characters. Under POSIX or System V, we can specify a minimum number of characters to read, so there is no serious trouble. Under BSD, we figure out how many characters we have left to read, how long it will take for them to arrive at the current baud rate, and sleep that long. Doing this with a timeout and avoiding all possible race conditions get very hairy, though. Basically, we're going to schedule a SIGALRM for when the timeout expires. I don't really want to do a longjmp in the SIGALRM handler, though, because that may lose data. Therefore, I have the signal handler set a variable. However, this means that there will be a span of time between the time the code checks the variable and the time it calls the read system call; if the SIGALRM occurs during that time, the read might hang forever. To avoid this, the SIGALRM handler not only sets a global variable, it also schedules another SIGALRM for one second in the future (POSIX specifies that a signal handler is permitted to safely call alarm). To avoid getting a continual sequence of SIGALRM interrupts, we change the signal handler to ignore SIGALRM when we're about to exit the function. This means that every time we execute fsysdep_conn_read we make at least five system calls. It's the best I've been able to come up with, though. When fsysdep_conn_read finishes, there will be no SIGALRM scheduled and SIGALRM will be ignored. */ boolean fsysdep_conn_read (qconn, zbuf, pclen, cmin, ctimeout, freport) struct sconnection *qconn; char *zbuf; size_t *pclen; size_t cmin; int ctimeout; boolean freport; { CATCH_PROTECT size_t cwant; boolean fret; register struct ssysdep_conn * const q = (struct ssysdep_conn *) qconn->psysdep; cwant = *pclen; *pclen = 0; /* Guard against a bad timeout. We return TRUE when a timeout expires. It is possible to get a negative timeout here because the calling code does not check user supplied timeouts for plausibility. */ if (ctimeout <= 0) return TRUE; /* We want to do a blocking read. */ if (! fsblock (q, TRUE)) return FALSE; fSalarm = FALSE; /* We're going to set up an alarm signal to last for the entire read. If the read system call cannot be interrupted, the signal handler will do a longjmp causing fsysdep_catch (a macro) to return FALSE. We handle that here. If read can be interrupted, fsysdep_catch will be defined to TRUE. */ if (fsysdep_catch ()) { /* Prepare to catch SIGALRM and schedule the signal. */ usysdep_start_catch (); usset_signal (SIGALRM, usalarm, TRUE, (boolean *) NULL); alarm (ctimeout); } else { /* We caught a signal. We don't actually have to do anything, as all the appropriate checks are made at the start of the following loop. */ } fret = FALSE; while (TRUE) { int cgot; #if HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS /* If we can tell the terminal not to return until we have a certain number of characters, do so. */ if (q->fterminal) { int csetmin; /* I'm not that confident about setting MIN to values larger than 127, although up to 255 would probably work. */ if (cmin < 127) csetmin = cmin; else csetmin = 127; if (csetmin != cSmin) { q->snew.c_cc[VMIN] = csetmin; while (! fsetterminfo (q->o, &q->snew)) { if (errno != EINTR || FGOT_QUIT_SIGNAL ()) { int ierr; /* We turn off the signal before reporting the error to minimize any problems with interrupted system calls. */ ierr = errno; usset_signal (SIGALRM, SIG_IGN, TRUE, (boolean *) NULL); alarm (0); usysdep_end_catch (); ulog (LOG_ERROR, "Can't set MIN for terminal: %s", strerror (ierr)); return FALSE; } if (fSalarm) { ulog (LOG_ERROR, "Timed out when setting MIN to %d; retrying", csetmin); fSalarm = FALSE; alarm (ctimeout); } } cSmin = csetmin; } } #endif /* HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS */ /* If we've received a signal, get out now. */ if (FGOT_QUIT_SIGNAL ()) break; /* If we've already gotten a SIGALRM, get out with whatever we've accumulated. */ if (fSalarm) { fret = TRUE; break; } /* Right here is the race condition which we avoid by having the SIGALRM handler schedule another SIGALRM. */ #if HAVE_TLI if (q->ftli) { int iflags; cgot = t_rcv (q->o, zbuf, cwant, &iflags); if (cgot < 0 && t_errno != TSYSERR) { usset_signal (SIGALRM, SIG_IGN, TRUE, (boolean *) NULL); alarm (0); usysdep_end_catch (); if (freport) ulog (LOG_ERROR, "t_rcv: %s", (t_errno >= 0 && t_errno < t_nerr ? t_errlist[t_errno] : "unknown TLI error")); return FALSE; } } else #endif cgot = read (q->o, zbuf, cwant); /* If the read returned an error, check for signals. */ if (cgot < 0) { if (errno == EINTR) { /* Log the signal. */ ulog (LOG_ERROR, (const char *) NULL); } if (fSalarm) { fret = TRUE; break; } if (FGOT_QUIT_SIGNAL ()) break; } /* If read returned an error, get out. We just ignore EINTR here, since it must be from some signal we don't care about. If the read returned 0 then the line must have been hung up (normally we would have received SIGHUP, but we can't count on that). We turn off the signals before calling ulog to reduce problems with interrupted system calls. */ if (cgot <= 0) { if (cgot < 0 && errno == EINTR) cgot = 0; else { int ierr; ierr = errno; usset_signal (SIGALRM, SIG_IGN, TRUE, (boolean *) NULL); alarm (0); usysdep_end_catch (); if (freport) { if (cgot == 0) ulog (LOG_ERROR, "Line disconnected"); else ulog (LOG_ERROR, "read: %s", strerror (ierr)); } return FALSE; } } cwant -= cgot; if (cgot >= cmin) cmin = 0; else cmin -= cgot; zbuf += cgot; *pclen += cgot; /* If we have enough data, get out now. */ if (cmin == 0) { fret = TRUE; break; } #if HAVE_BSD_TTY /* We still want more data, so sleep long enough for the rest of it to arrive. We don't this for System V or POSIX because setting MIN is good enough (we can't sleep longer than it takes to get MAX_INPUT characters anyhow). The baud rate is approximately 10 times the number of characters which will arrive in one second, so the number of milliseconds to sleep == characters * (milliseconds / character) == characters * (1000 * (seconds / character)) == characters * (1000 * (1 / (baud / 10))) == characters * (10000 / baud) We arbitrarily reduce the sleep amount by 10 milliseconds to attempt to account for the amount of time it takes to set up the sleep. This is how long it takes to get half a character at 19200 baud. We then don't bother to sleep for less than 10 milliseconds. We don't sleep if the read was interrupted. We use select to sleep. It would be easy to use poll as well, but it's unlikely that any system with BSD ttys would have poll but not select. Using select avoids hassles with the pending SIGALRM; if it hits the select will be interrupted, and otherwise the select will not affect it. */ #if ! HAVE_SELECT #error This code requires select; feel free to extend it #endif if (q->fterminal && cmin > 1 && cgot > 0) { int csleepchars; int isleep; /* We don't try to read all the way up to MAX_INPUT, since that might drop a character. */ if (cmin <= MAX_INPUT - 10) csleepchars = cmin; else csleepchars = MAX_INPUT - 10; isleep = (int) (((long) csleepchars * 10000L) / q->ibaud); isleep -= 10; if (isleep > 10) { struct timeval s; s.tv_sec = isleep / 1000; s.tv_usec = (isleep % 1000) * 1000; /* Some versions of select take a pointer to an int, while some take a pointer to an fd_set. I just cast the arguments to a generic pointer, and assume that any machine which distinguishes int * from fd_set * (I would be amazed if there are any such machines) have an appropriate prototype somewhere or other. */ (void) select (0, (pointer) NULL, (pointer) NULL, (pointer) NULL, &s); /* Here either the select finished sleeping or we got a SIGALRM. If the latter occurred, fSalarm was set to TRUE; it will be checked at the top of the loop. */ } } #endif /* HAVE_BSD_TTY */ } /* Turn off the pending SIGALRM and return. */ usset_signal (SIGALRM, SIG_IGN, TRUE, (boolean *) NULL); alarm (0); usysdep_end_catch (); return fret; } /* Read from a stdin port. */ static boolean fsstdin_read (qconn, zbuf, pclen, cmin, ctimeout, freport) struct sconnection *qconn; char *zbuf; size_t *pclen; size_t cmin; int ctimeout; boolean freport; { struct ssysdep_conn *qsysdep; qsysdep = (struct ssysdep_conn *) qconn->psysdep; qsysdep->o = 0; return fsysdep_conn_read (qconn, zbuf, pclen, cmin, ctimeout, freport); } /* Write data to a connection. This routine handles all types of connections, including TLI. */ boolean fsysdep_conn_write (qconn, zwrite, cwrite) struct sconnection *qconn; const char *zwrite; size_t cwrite; { struct ssysdep_conn *q; int czero; q = (struct ssysdep_conn *) qconn->psysdep; /* We want blocking writes here. */ if (! fsblock (q, TRUE)) return FALSE; czero = 0; while (cwrite > 0) { int cdid; /* Loop until we don't get an interrupt. */ while (TRUE) { /* If we've received a signal, don't continue. */ if (FGOT_QUIT_SIGNAL ()) return FALSE; #if HAVE_TLI if (q->ftli) { cdid = t_snd (q->o, zwrite, cwrite, 0); if (cdid < 0 && t_errno != TSYSERR) { ulog (LOG_ERROR, "t_snd: %s", (t_errno >= 0 && t_errno < t_nerr ? t_errlist[t_errno] : "unknown TLI error")); return FALSE; } } else #endif cdid = write (q->o, zwrite, cwrite); if (cdid >= 0) break; if (errno != EINTR) break; /* We were interrupted by a signal. Log it. */ ulog (LOG_ERROR, (const char *) NULL); } if (cdid < 0) { if (errno != EAGAIN && errno != EWOULDBLOCK && errno != ENODATA) { ulog (LOG_ERROR, "write: %s", strerror (errno)); return FALSE; } cdid = 0; } if (cdid == 0) { /* On some systems write will return 0 if carrier is lost. If we fail to write anything ten times in a row, we assume that this has happened. This is hacked in like this because there seems to be no reliable way to tell exactly why the write returned 0. */ ++czero; if (czero >= 10) { ulog (LOG_ERROR, "Line disconnected"); return FALSE; } } else { czero = 0; cwrite -= cdid; zwrite += cdid; } } return TRUE; } /* Write to a stdin port. */ static boolean fsstdin_write (qconn, zwrite, cwrite) struct sconnection *qconn; const char *zwrite; size_t cwrite; { struct ssysdep_conn *qsysdep; qsysdep = (struct ssysdep_conn *) qconn->psysdep; qsysdep->o = 0; if (! fsblock (qsysdep, TRUE)) return FALSE; qsysdep->o = 1; return fsysdep_conn_write (qconn, zwrite, cwrite); } /* The fsysdep_conn_io routine is supposed to both read and write data until it has either filled its read buffer or written out all the data it was given. This lets us write out large packets without losing incoming data. It handles all types of connections, including TLI. */ boolean fsysdep_conn_io (qconn, zwrite, pcwrite, zread, pcread) struct sconnection *qconn; const char *zwrite; size_t *pcwrite; char *zread; size_t *pcread; { struct ssysdep_conn *q; size_t cwrite, cread; int czero; q = (struct ssysdep_conn *) qconn->psysdep; cwrite = *pcwrite; *pcwrite = 0; cread = *pcread; *pcread = 0; czero = 0; while (TRUE) { int cgot, cdid; size_t cdo; /* This used to always use nonblocking writes, but it turns out that some systems don't support them on terminals. The current algorithm is: loop: unblocked read if read buffer full, return if nothing to write, return if HAVE_UNBLOCKED_WRITES write all data else write up to SINGLE_WRITE bytes if all data written, return if no data written blocked write of up to SINGLE_WRITE bytes This algorithm should work whether the system supports unblocked writes on terminals or not. If the system supports unblocked writes but HAVE_UNBLOCKED_WRITES is 0, then it will call write more often than it needs to. If the system does not support unblocked writes but HAVE_UNBLOCKED_WRITES is 1, then the write may hang so long that incoming data is lost. This is actually possible at high baud rates on any system when a blocking write is done; there is no solution, except hardware handshaking. */ /* If we are running on standard input, we switch the file descriptors by hand. */ if (q->istdout_flags >= 0) q->o = 0; /* Do an unblocked read. */ if (! fsblock (q, FALSE)) return FALSE; /* Loop until we get something (error or data) other than an acceptable EINTR. */ while (TRUE) { /* If we've received a signal, don't continue. */ if (FGOT_QUIT_SIGNAL ()) return FALSE; #if HAVE_TLI if (q->ftli) { int iflags; cgot = t_rcv (q->o, zread, cread, &iflags); if (cgot < 0) { if (t_errno == TNODATA) errno = EAGAIN; else if (t_errno != TSYSERR) { ulog (LOG_ERROR, "t_rcv: %s", (t_errno >= 0 && t_errno < t_nerr ? t_errlist[t_errno] : "unknown TLI error")); return FALSE; } } } else #endif cgot = read (q->o, zread, cread); if (cgot >= 0) break; if (errno != EINTR) break; /* We got interrupted by a signal. Log it. */ ulog (LOG_ERROR, (const char *) NULL); } if (cgot < 0) { if (errno != EAGAIN && errno != EWOULDBLOCK && errno != ENODATA) { ulog (LOG_ERROR, "read: %s", strerror (errno)); return FALSE; } cgot = 0; } cread -= cgot; zread += cgot; *pcread += cgot; /* If we've filled the read buffer, or we have nothing left to write, return out. */ if (cread == 0 || cwrite == 0) return TRUE; /* The port is currently unblocked. Do a write. */ cdo = cwrite; #if ! HAVE_UNBLOCKED_WRITES if (q->fterminal && cdo > SINGLE_WRITE) cdo = SINGLE_WRITE; #endif if (q->istdout_flags >= 0) q->o = 1; /* Loop until we get something besides EINTR. */ while (TRUE) { /* If we've received a signal, don't continue. */ if (FGOT_QUIT_SIGNAL ()) return FALSE; #if HAVE_TLI if (q->ftli) { cdid = t_snd (q->o, zwrite, cdo, 0); if (cdid < 0) { if (t_errno == TFLOW) errno = EAGAIN; else if (t_errno != TSYSERR) { ulog (LOG_ERROR, "t_snd: %s", (t_errno >= 0 && t_errno < t_nerr ? t_errlist[t_errno] : "unknown TLI error")); return FALSE; } } } else #endif cdid = write (q->o, zwrite, cdo); if (cdid >= 0) break; if (errno != EINTR) break; /* We got interrupted by a signal. Log it. */ ulog (LOG_ERROR, (const char *) NULL); } if (cdid < 0) { if (errno != EAGAIN && errno != EWOULDBLOCK && errno != ENODATA) { ulog (LOG_ERROR, "write: %s", strerror (errno)); return FALSE; } cdid = 0; } if (cdid > 0) { /* We wrote some data. If we wrote everything, return out. Otherwise loop around and do another read. */ cwrite -= cdid; zwrite += cdid; *pcwrite += cdid; if (cwrite == 0) return TRUE; czero = 0; } else { /* We didn't write any data. Do a blocking write. */ if (q->istdout_flags >= 0) q->o = 0; if (! fsblock (q, TRUE)) return FALSE; cdo = cwrite; if (cdo > SINGLE_WRITE) cdo = SINGLE_WRITE; DEBUG_MESSAGE1 (DEBUG_PORT, "fsysdep_conn_io: Blocking write of %lud", (unsigned long) cdo); if (q->istdout_flags >= 0) q->o = 1; /* Loop until we get something besides EINTR. */ while (TRUE) { /* If we've received a signal, don't continue. */ if (FGOT_QUIT_SIGNAL ()) return FALSE; #if HAVE_TLI if (q->ftli) { cdid = t_snd (q->o, zwrite, cdo, 0); if (cdid < 0 && t_errno != TSYSERR) { ulog (LOG_ERROR, "t_snd: %s", (t_errno >= 0 && t_errno < t_nerr ? t_errlist[t_errno] : "unknown TLI error")); return FALSE; } } else #endif cdid = write (q->o, zwrite, cdo); if (cdid >= 0) break; if (errno != EINTR) break; /* We got interrupted by a signal. Log it. */ ulog (LOG_ERROR, (const char *) NULL); } if (cdid < 0) { ulog (LOG_ERROR, "write: %s", strerror (errno)); return FALSE; } if (cdid == 0) { /* On some systems write will return 0 if carrier is lost. If we fail to write anything ten times in a row, we assume that this has happened. This is hacked in like this because there seems to be no reliable way to tell exactly why the write returned 0. */ ++czero; if (czero >= 10) { ulog (LOG_ERROR, "Line disconnected"); return FALSE; } } else { cwrite -= cdid; zwrite += cdid; *pcwrite += cdid; czero = 0; } } } } /* Send a break character to a serial port. */ static boolean fsserial_break (qconn) struct sconnection *qconn; { struct ssysdep_conn *q; q = (struct ssysdep_conn *) qconn->psysdep; #if HAVE_BSD_TTY (void) ioctl (q->o, TIOCSBRK, 0); sleep (2); (void) ioctl (q->o, TIOCCBRK, 0); return TRUE; #endif /* HAVE_BSD_TTY */ #if HAVE_SYSV_TERMIO (void) ioctl (q->o, TCSBRK, 0); return TRUE; #endif /* HAVE_SYSV_TERMIO */ #if HAVE_POSIX_TERMIOS return tcsendbreak (q->o, 0) == 0; #endif /* HAVE_POSIX_TERMIOS */ } /* Send a break character to a stdin port. */ static boolean fsstdin_break (qconn) struct sconnection *qconn; { struct ssysdep_conn *qsysdep; qsysdep = (struct ssysdep_conn *) qconn->psysdep; qsysdep->o = 1; return fsserial_break (qconn); } /* Change the setting of a serial port. */ /*ARGSUSED*/ static boolean fsserial_set (qconn, tparity, tstrip, txonxoff) struct sconnection *qconn; enum tparitysetting tparity; enum tstripsetting tstrip; enum txonxoffsetting txonxoff; { register struct ssysdep_conn *q; boolean fchanged, fdo; int iset = 0; int iclear = 0; q = (struct ssysdep_conn *) qconn->psysdep; if (! q->fterminal) return TRUE; fchanged = FALSE; /* Set the parity for output characters. */ #if HAVE_BSD_TTY /* This will also cause parity detection on input characters. */ fdo = FALSE; switch (tparity) { case PARITYSETTING_DEFAULT: break; case PARITYSETTING_NONE: #if HAVE_PARITY_BUG /* The Sony NEWS mishandles this for some reason. */ iset = 0; iclear = ANYP; #else iset = ANYP; iclear = 0; #endif fdo = TRUE; break; case PARITYSETTING_EVEN: iset = EVENP; iclear = ODDP; fdo = TRUE; break; case PARITYSETTING_ODD: iset = ODDP; iclear = EVENP; fdo = TRUE; break; case PARITYSETTING_MARK: case PARITYSETTING_SPACE: /* Not supported. */ break; } if (fdo) { if ((q->snew.stty.sg_flags & iset) != iset || (q->snew.stty.sg_flags & iclear) != 0) { q->snew.stty.sg_flags |= iset; q->snew.stty.sg_flags &=~ iclear; fchanged = TRUE; } } #else /* ! HAVE_BSD_TTY */ fdo = FALSE; switch (tparity) { case PARITYSETTING_DEFAULT: break; case PARITYSETTING_NONE: iset = CS8; iclear = PARENB | PARODD | (CSIZE &~ CS8); fdo = TRUE; break; case PARITYSETTING_EVEN: iset = PARENB | CS7; iclear = PARODD | (CSIZE &~ CS7); fdo = TRUE; break; case PARITYSETTING_ODD: iset = PARENB | PARODD | CS7; iclear = CSIZE &~ CS7; fdo = TRUE; break; case PARITYSETTING_MARK: case PARITYSETTING_SPACE: /* Not supported. */ break; } if (fdo) { if ((q->snew.c_cflag & iset) != iset || (q->snew.c_cflag & iclear) != 0) { q->snew.c_cflag |= iset; q->snew.c_cflag &=~ iclear; fchanged = TRUE; } } #endif /* ! HAVE_BSD_TTY */ /* Set whether input characters are stripped to seven bits. */ #if HAVE_BSD_TTY #ifdef LPASS8 { int i; i = LPASS8; if (tstrip == STRIPSETTING_EIGHTBITS) { i = LPASS8; (void) ioctl (q->o, TIOCLBIS, &i); } else if (tstrip == STRIPSETTING_SEVENBITS) { i = LPASS8; (void) ioctl (q->o, TIOCLBIC, &i); } } #endif #else /* ! HAVE_BSD_TTY */ fdo = FALSE; switch (tstrip) { case STRIPSETTING_DEFAULT: break; case STRIPSETTING_EIGHTBITS: iset = 0; iclear = ISTRIP; fdo = TRUE; break; case STRIPSETTING_SEVENBITS: iset = ISTRIP; iclear = 0; fdo = TRUE; break; } if (fdo) { if ((q->snew.c_iflag & iset) != iset || (q->snew.c_iflag & iclear) != 0) { q->snew.c_iflag |= iset; q->snew.c_iflag &=~ iclear; fchanged = TRUE; } } #endif /* ! HAVE_BSD_TTY */ /* Set XON/XOFF handshaking. */ #if HAVE_BSD_TTY fdo = FALSE; switch (txonxoff) { case XONXOFF_DEFAULT: break; case XONXOFF_OFF: iset = RAW; iclear = TANDEM | CBREAK; fdo = TRUE; break; case XONXOFF_ON: iset = CBREAK | TANDEM; iclear = RAW; fdo = TRUE; break; } if (fdo) { if ((q->snew.stty.sg_flags & iset) != iset || (q->snew.stty.sg_flags & iclear) != 0) { q->snew.stty.sg_flags |= iset; q->snew.stty.sg_flags &=~ iclear; fchanged = TRUE; } } #else /* ! HAVE_BSD_TTY */ fdo = FALSE; switch (txonxoff) { case XONXOFF_DEFAULT: break; case XONXOFF_OFF: iset = 0; iclear = IXON | IXOFF; fdo = TRUE; break; case XONXOFF_ON: #ifdef CRTSCTS #if HAVE_POSIX_TERMIOS /* This is system dependent, but I haven't figured out a good way around it yet. If we are doing hardware flow control, we don't send XON/XOFF characters but we do recognize them. */ if ((q->snew.c_cflag & CRTSCTS) != 0) { iset = IXON; iclear = IXOFF; fdo = TRUE; break; } #endif /* HAVE_POSIX_TERMIOS */ #endif /* defined (CRTSCTS) */ iset = IXON | IXOFF; iclear = 0; fdo = TRUE; break; } if (fdo) { if ((q->snew.c_iflag & iset) != iset || (q->snew.c_iflag & iclear) != 0) { q->snew.c_iflag |= iset; q->snew.c_iflag &=~ iclear; fchanged = TRUE; } } #endif /* ! HAVE_BSD_TTY */ if (fchanged) { if (! fsetterminfodrain (q->o, &q->snew)) { ulog (LOG_ERROR, "Can't change terminal settings: %s", strerror (errno)); return FALSE; } } #if HAVE_BSD_TTY if (txonxoff == XONXOFF_ON && (q->snew.stty.sg_flags & ANYP) == ANYP) { int i; /* At least on Ultrix, we seem to have to set LLITOUT and LPASS8. This shouldn't foul things up anywhere else. As far as I can tell, this has to be done after setting the terminal into cbreak mode, not before. */ #ifndef LLITOUT #define LLITOUT 0 #endif #ifndef LPASS8 #define LPASS8 0 #endif #ifndef LAUTOFLOW #define LAUTOFLOW 0 #endif i = LLITOUT | LPASS8 | LAUTOFLOW; (void) ioctl (q->o, TIOCLBIS, &i); #if HAVE_STRIP_BUG /* Ultrix 4.0 has a peculiar problem: setting CBREAK always causes input characters to be stripped. I hope this does not apply to other BSD systems. It is possible to work around this by using the termio call. I wish this sort of stuff was not necessary!!! */ { struct termio s; if (ioctl (q->o, TCGETA, &s) >= 0) { s.c_iflag &=~ ISTRIP; (void) ioctl (q->o, TCSETA, &s); } } #endif /* HAVE_STRIP_BUG */ } #endif /* HAVE_BSD_TTY */ return TRUE; } /* Change settings of a stdin port. */ static boolean fsstdin_set (qconn, tparity, tstrip, txonxoff) struct sconnection *qconn; enum tparitysetting tparity; enum tstripsetting tstrip; enum txonxoffsetting txonxoff; { struct ssysdep_conn *qsysdep; qsysdep = (struct ssysdep_conn *) qconn->psysdep; qsysdep->o = 0; return fsserial_set (qconn, tparity, tstrip, txonxoff); } /* Run a chat program. */ static boolean fsrun_chat (oread, owrite, pzprog) int oread; int owrite; char **pzprog; { int aidescs[3]; FILE *e; pid_t ipid; char *z; size_t c; aidescs[0] = oread; aidescs[1] = owrite; aidescs[2] = SPAWN_READ_PIPE; /* Pass fkeepuid, fkeepenv and fshell as TRUE. This puts the responsibility of maintaing security on the chat program. */ ipid = ixsspawn ((const char **) pzprog, aidescs, TRUE, TRUE, (const char *) NULL, FALSE, TRUE, (const char *) NULL, (const char *) NULL, (const char *) NULL); if (ipid < 0) { ulog (LOG_ERROR, "ixsspawn (%s): %s", pzprog[0], strerror (errno)); return FALSE; } e = fdopen (aidescs[2], (char *) "r"); if (e == NULL) { ulog (LOG_ERROR, "fdopen: %s", strerror (errno)); (void) close (aidescs[2]); (void) kill (ipid, SIGKILL); (void) ixswait ((unsigned long) ipid, (const char *) NULL); return FALSE; } /* The FILE e now is attached to stderr of the program. Forward every line the program outputs to the log file. */ z = NULL; c = 0; while (getline (&z, &c, e) > 0) { size_t clen; clen = strlen (z); if (z[clen - 1] == '\n') z[clen - 1] = '\0'; if (*z != '\0') ulog (LOG_NORMAL, "chat: %s", z); } xfree ((pointer) z); (void) fclose (e); return ixswait ((unsigned long) ipid, "Chat program") == 0; } /* Run a chat program on a stdin port. */ /*ARGSUSED*/ static boolean fsstdin_chat (qconn, pzprog) struct sconnection *qconn; char **pzprog; { return fsrun_chat (0, 1, pzprog); } /* Run a chat program on any general type of connection. */ boolean fsysdep_conn_chat (qconn, pzprog) struct sconnection *qconn; char **pzprog; { struct ssysdep_conn *qsysdep; qsysdep = (struct ssysdep_conn *) qconn->psysdep; return fsrun_chat (qsysdep->o, qsysdep->o, pzprog); } /* Return baud rate of a serial port. */ static long isserial_baud (qconn) struct sconnection *qconn; { struct ssysdep_conn *qsysdep; qsysdep = (struct ssysdep_conn *) qconn->psysdep; return qsysdep->ibaud; }