29da75477b
reads eating 100% CPU. Fix this by skipping select on STDIN after reading EOF -- permanently if STDIN is not terminal and for one second if it is. Also after reading EOF from STDIN we have to pass it to the program being scripted. The previous approach was to write zero bytes into the pseudo-terminal. This does not work because zero-byte write does not have any effect on read. Fix this by sending VEOF instead. Submitted by: Ronald Klop <ronald-freebsd8@klop.yi.org> Discussed with: kib, Chris Torek <chris.torek@gmail.com> Approved by: kib MFC after: 1 week
290 lines
6.4 KiB
C
290 lines
6.4 KiB
C
/*
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* Copyright (c) 1980, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1980, 1992, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif
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#ifndef lint
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static const char sccsid[] = "@(#)script.c 8.1 (Berkeley) 6/6/93";
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#endif
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <libutil.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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static FILE *fscript;
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static int master, slave;
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static int child;
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static const char *fname;
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static int qflg, ttyflg;
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static struct termios tt;
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static void done(int) __dead2;
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static void doshell(char **);
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static void fail(void);
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static void finish(void);
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static void usage(void);
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int
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main(int argc, char *argv[])
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{
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int cc;
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struct termios rtt, stt;
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struct winsize win;
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int aflg, kflg, ch, n;
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struct timeval tv, *tvp;
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time_t tvec, start;
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char obuf[BUFSIZ];
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char ibuf[BUFSIZ];
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fd_set rfd;
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int flushtime = 30;
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int readstdin;
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aflg = kflg = 0;
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while ((ch = getopt(argc, argv, "aqkt:")) != -1)
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switch(ch) {
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case 'a':
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aflg = 1;
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break;
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case 'q':
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qflg = 1;
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break;
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case 'k':
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kflg = 1;
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break;
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case 't':
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flushtime = atoi(optarg);
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if (flushtime < 0)
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err(1, "invalid flush time %d", flushtime);
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc > 0) {
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fname = argv[0];
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argv++;
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argc--;
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} else
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fname = "typescript";
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if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL)
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err(1, "%s", fname);
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if ((ttyflg = isatty(STDIN_FILENO)) != 0) {
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if (tcgetattr(STDIN_FILENO, &tt) == -1)
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err(1, "tcgetattr");
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if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) == -1)
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err(1, "ioctl");
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if (openpty(&master, &slave, NULL, &tt, &win) == -1)
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err(1, "openpty");
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} else {
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if (openpty(&master, &slave, NULL, NULL, NULL) == -1)
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err(1, "openpty");
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}
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if (!qflg) {
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tvec = time(NULL);
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(void)printf("Script started, output file is %s\n", fname);
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(void)fprintf(fscript, "Script started on %s", ctime(&tvec));
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fflush(fscript);
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}
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if (ttyflg) {
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rtt = tt;
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cfmakeraw(&rtt);
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rtt.c_lflag &= ~ECHO;
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(void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt);
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}
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child = fork();
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if (child < 0) {
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warn("fork");
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done(1);
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}
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if (child == 0)
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doshell(argv);
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close(slave);
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start = tvec = time(0);
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readstdin = 1;
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for (;;) {
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FD_ZERO(&rfd);
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FD_SET(master, &rfd);
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if (readstdin)
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FD_SET(STDIN_FILENO, &rfd);
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if ((!readstdin && ttyflg) || flushtime > 0) {
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tv.tv_sec = !readstdin && ttyflg ? 1 :
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flushtime - (tvec - start);
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tv.tv_usec = 0;
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tvp = &tv;
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readstdin = 1;
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} else {
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tvp = NULL;
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}
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n = select(master + 1, &rfd, 0, 0, tvp);
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if (n < 0 && errno != EINTR)
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break;
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if (n > 0 && FD_ISSET(STDIN_FILENO, &rfd)) {
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cc = read(STDIN_FILENO, ibuf, BUFSIZ);
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if (cc < 0)
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break;
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if (cc == 0) {
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if (tcgetattr(master, &stt) == 0 &&
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(stt.c_lflag & ICANON) != 0) {
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(void)write(master, &stt.c_cc[VEOF], 1);
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}
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readstdin = 0;
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}
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if (cc > 0) {
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(void)write(master, ibuf, cc);
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if (kflg && tcgetattr(master, &stt) >= 0 &&
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((stt.c_lflag & ECHO) == 0)) {
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(void)fwrite(ibuf, 1, cc, fscript);
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}
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}
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}
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if (n > 0 && FD_ISSET(master, &rfd)) {
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cc = read(master, obuf, sizeof (obuf));
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if (cc <= 0)
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break;
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(void)write(STDOUT_FILENO, obuf, cc);
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(void)fwrite(obuf, 1, cc, fscript);
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}
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tvec = time(0);
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if (tvec - start >= flushtime) {
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fflush(fscript);
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start = tvec;
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}
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}
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finish();
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done(0);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: script [-akq] [-t time] [file [command ...]]\n");
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exit(1);
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}
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static void
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finish(void)
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{
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int e, status;
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if (waitpid(child, &status, 0) == child) {
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if (WIFEXITED(status))
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e = WEXITSTATUS(status);
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else if (WIFSIGNALED(status))
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e = WTERMSIG(status);
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else /* can't happen */
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e = 1;
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done(e);
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}
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}
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static void
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doshell(char **av)
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{
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const char *shell;
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int k;
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shell = getenv("SHELL");
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if (shell == NULL)
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shell = _PATH_BSHELL;
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if (av[0])
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for (k = 0 ; av[k] ; ++k)
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fprintf(fscript, "%s%s", k ? " " : "", av[k]);
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fprintf(fscript, "\r\n");
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(void)close(master);
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(void)fclose(fscript);
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login_tty(slave);
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setenv("SCRIPT", fname, 1);
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if (av[0]) {
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execvp(av[0], av);
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warn("%s", av[0]);
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} else {
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execl(shell, shell, "-i", (char *)NULL);
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warn("%s", shell);
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}
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fail();
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}
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static void
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fail(void)
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{
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(void)kill(0, SIGTERM);
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done(1);
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}
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static void
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done(int eno)
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{
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time_t tvec;
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if (ttyflg)
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(void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
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tvec = time(NULL);
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if (!qflg) {
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(void)fprintf(fscript,"\nScript done on %s", ctime(&tvec));
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(void)printf("\nScript done, output file is %s\n", fname);
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}
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(void)fclose(fscript);
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(void)close(master);
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exit(eno);
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}
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