NetBSD/usr.bin/script/script.c

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/* $NetBSD: script.c,v 1.7 1998/12/19 21:53:56 christos Exp $ */
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/*
* Copyright (c) 1980, 1992, 1993
* The Regents of the University of California. All rights reserved.
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*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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.
*/
#include <sys/cdefs.h>
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#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1980, 1992, 1993\n\
The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)script.c 8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: script.c,v 1.7 1998/12/19 21:53:56 christos Exp $");
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#endif /* not lint */
#include <sys/types.h>
#include <sys/wait.h>
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#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
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#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <time.h>
#include <tzfile.h>
#include <unistd.h>
#include <util.h>
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FILE *fscript;
int master, slave;
int child, subchild;
int outcc;
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char *fname;
struct termios tt;
void done __P((void));
void dooutput __P((void));
void doshell __P((void));
void fail __P((void));
void finish __P((int));
int main __P((int, char **));
void scriptflush __P((int));
int
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main(argc, argv)
int argc;
char *argv[];
{
int cc;
struct termios rtt;
struct winsize win;
int aflg, ch;
char ibuf[BUFSIZ];
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aflg = 0;
while ((ch = getopt(argc, argv, "a")) != -1)
switch(ch) {
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case 'a':
aflg = 1;
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break;
case '?':
default:
(void)fprintf(stderr, "usage: script [-a] [file]\n");
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exit(1);
}
argc -= optind;
argv += optind;
if (argc > 0)
fname = argv[0];
else
fname = "typescript";
if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL)
err(1, "fopen %s", fname);
(void)tcgetattr(STDIN_FILENO, &tt);
(void)ioctl(STDIN_FILENO, TIOCGWINSZ, &win);
if (openpty(&master, &slave, NULL, &tt, &win) == -1)
err(1, "openpty");
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(void)printf("Script started, output file is %s\n", fname);
rtt = tt;
cfmakeraw(&rtt);
rtt.c_lflag &= ~ECHO;
(void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt);
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(void)signal(SIGCHLD, finish);
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child = fork();
if (child < 0) {
warn("fork");
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fail();
}
if (child == 0) {
subchild = child = fork();
if (child < 0) {
warn("fork");
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fail();
}
if (child)
dooutput();
else
doshell();
}
(void)fclose(fscript);
while ((cc = read(STDIN_FILENO, ibuf, BUFSIZ)) > 0)
(void)write(master, ibuf, cc);
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done();
/* NOTREACHED */
return (0);
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}
void
finish(signo)
int signo;
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{
int die, pid, status;
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die = 0;
while ((pid = wait3(&status, WNOHANG, 0)) > 0)
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if (pid == child)
die = 1;
if (die)
done();
}
void
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dooutput()
{
struct itimerval value;
int cc;
time_t tvec;
char obuf[BUFSIZ];
(void)close(STDIN_FILENO);
tvec = time(NULL);
(void)fprintf(fscript, "Script started on %s", ctime(&tvec));
(void)signal(SIGALRM, scriptflush);
value.it_interval.tv_sec = SECSPERMIN / 2;
value.it_interval.tv_usec = 0;
value.it_value = value.it_interval;
(void)setitimer(ITIMER_REAL, &value, NULL);
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for (;;) {
cc = read(master, obuf, sizeof (obuf));
if (cc <= 0)
break;
(void)write(1, obuf, cc);
(void)fwrite(obuf, 1, cc, fscript);
outcc += cc;
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}
done();
}
void
scriptflush(signo)
int signo;
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{
if (outcc) {
(void)fflush(fscript);
outcc = 0;
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}
}
void
doshell()
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{
char *shell;
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shell = getenv("SHELL");
if (shell == NULL)
shell = _PATH_BSHELL;
(void)close(master);
(void)fclose(fscript);
login_tty(slave);
execl(shell, shell, "-i", NULL);
warn("execl %s", shell);
fail();
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}
void
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fail()
{
(void)kill(0, SIGTERM);
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done();
}
void
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done()
{
time_t tvec;
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if (subchild) {
tvec = time(NULL);
(void)fprintf(fscript,"\nScript done on %s", ctime(&tvec));
(void)fclose(fscript);
(void)close(master);
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} else {
(void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
(void)printf("Script done, output file is %s\n", fname);
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}
exit(0);
}