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Rewrite script as a select loop rather than as a twin reader/write process.
This allows simple logging of keys sent to a session (turned on with -k). Also allow specifying the script file flush interval.
This commit is contained in:
Peter Wemm
parent
a2034fc036
commit
e8eb82a81c
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=34295
@ -30,7 +30,7 @@
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)script.1 8.1 (Berkeley) 6/6/93
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.\" $Id$
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.\" $Id: script.1,v 1.3 1997/12/29 13:31:46 peter Exp $
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.\"
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.Dd June 6, 1993
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.Dt SCRIPT 1
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@ -41,7 +41,9 @@
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.Sh SYNOPSIS
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.Nm
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.Op Fl a
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.Op Fl k
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.Op Fl q
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.Op Fl t Ar time
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.Op Ar file
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.Op Ar command ...
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.Sh DESCRIPTION
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@ -68,16 +70,23 @@ is given,
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will run the specified command with an optional argument vector
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instead of an interactive shell.
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.Pp
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Option:
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.Bl -tag -width Ds
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Options:
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.Bl -tag -width xxxxxxx
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.It Fl a
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Append the output to
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.Ar file
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or
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.Pa typescript ,
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retaining the prior contents.
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.It Fl k
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Log keys sent to program as well as output.
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.It Fl q
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Run in quiet mode, omit the start and stop status messages.
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.It Fl t Ar time
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Specify time interval between flushing script output file. A value of 0
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causes
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.Nm
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to flush for every character I/O event.
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.El
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.Pp
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The script ends when the forked shell (or command) exits (a
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@ -136,3 +145,9 @@ This is not what the naive user expects.
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.Pp
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It is not possible to specify a command without also naming the script file
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because of argument parsing compatability issues.
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.Pp
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When running in
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.Fl k
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mode, echo cancelling far from ideal. The slave terminal mode is checked
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for ECHO mode to check when to avoid manual echo logging. This does not
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work when in a raw mode where the program being run is doing manual echo.
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@ -42,7 +42,7 @@ static const char copyright[] =
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static char sccsid[] = "@(#)script.c 8.1 (Berkeley) 6/6/93";
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#endif
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static const char rcsid[] =
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"$Id: script.c,v 1.6 1997/12/29 13:31:46 peter Exp $";
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"$Id: script.c,v 1.7 1997/12/30 01:20:08 peter Exp $";
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#endif /* not lint */
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#include <sys/types.h>
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@ -52,6 +52,7 @@ static const char rcsid[] =
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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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@ -64,8 +65,7 @@ static const char rcsid[] =
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FILE *fscript;
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int master, slave;
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int child, subchild;
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int outcc;
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int child;
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char *fname;
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int qflg;
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@ -76,7 +76,6 @@ void dooutput __P((void));
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void doshell __P((char **));
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void fail __P((void));
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void finish __P((int));
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void scriptflush __P((int));
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static void usage __P((void));
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int
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@ -85,13 +84,19 @@ main(argc, argv)
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char *argv[];
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{
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register int cc;
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struct termios rtt;
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struct termios rtt, stt;
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struct winsize win;
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int aflg, ch;
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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 lastc = 1000;
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aflg = 0;
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while ((ch = getopt(argc, argv, "aq")) != -1)
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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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@ -99,6 +104,14 @@ main(argc, argv)
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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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@ -121,8 +134,12 @@ main(argc, argv)
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if (openpty(&master, &slave, NULL, &tt, &win) == -1)
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err(1, "openpty");
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if (!qflg)
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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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rtt = tt;
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cfmakeraw(&rtt);
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rtt.c_lflag &= ~ECHO;
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@ -134,28 +151,59 @@ main(argc, argv)
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warn("fork");
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fail();
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}
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if (child == 0) {
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subchild = child = fork();
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if (child < 0) {
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warn("fork");
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fail();
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}
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if (child)
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dooutput();
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else
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doshell(argv);
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}
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if (child == 0)
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doshell(argv);
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(void)fclose(fscript);
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while ((cc = read(STDIN_FILENO, ibuf, BUFSIZ)) > 0)
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(void)write(master, ibuf, cc);
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if (flushtime > 0)
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tvp = &tv;
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else
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tvp = NULL;
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start = time(0);
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FD_ZERO(&rfd);
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for (;;) {
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FD_SET(master, &rfd);
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FD_SET(STDIN_FILENO, &rfd);
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if (flushtime > 0) {
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tv.tv_sec = flushtime;
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tv.tv_usec = 0;
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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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(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(1, 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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done();
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}
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static void
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usage()
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{
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(void)fprintf(stderr, "usage: script [-a] [-q] [file] [command]\n");
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(void)fprintf(stderr,
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"usage: script [-a] [-q] [-k] [-t time] [file] [command]\n");
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exit(1);
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}
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@ -175,45 +223,6 @@ finish(signo)
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done();
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}
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void
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dooutput()
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{
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struct itimerval value;
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register int cc;
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time_t tvec;
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char obuf[BUFSIZ];
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(void)close(STDIN_FILENO);
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tvec = time(NULL);
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if (!qflg)
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(void)fprintf(fscript, "Script started on %s", ctime(&tvec));
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(void)signal(SIGALRM, scriptflush);
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value.it_interval.tv_sec = 60 / 2;
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value.it_interval.tv_usec = 0;
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value.it_value = value.it_interval;
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(void)setitimer(ITIMER_REAL, &value, NULL);
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for (;;) {
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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(1, obuf, cc);
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(void)fwrite(obuf, 1, cc, fscript);
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outcc += cc;
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}
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done();
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}
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void
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scriptflush(signo)
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int signo;
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{
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if (outcc) {
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(void)fflush(fscript);
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outcc = 0;
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}
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}
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void
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doshell(av)
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char **av;
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@ -248,16 +257,13 @@ done()
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{
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time_t tvec;
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if (subchild) {
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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)fclose(fscript);
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(void)close(master);
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} else {
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(void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
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if (!qflg)
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(void)printf("Script done, output file is %s\n", fname);
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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(0);
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}
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