According to the coreutils regression testsuite for timeout(1) It is expect to exit with a status being: 125 in case an invalid duration or signal is passed in arguments 126 in case an invalid command is passed in arguments 127 in case the command passed in arguments does not exists. While here document this behaviour in the man page
338 lines
7.0 KiB
C
338 lines
7.0 KiB
C
/*-
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* Copyright (c) 2014 Baptiste Daroussin <bapt@FreeBSD.org>
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* Copyright (c) 2014 Vsevolod Stakhov <vsevolod@FreeBSD.org>
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* 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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* in this position and unchanged.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <errno.h>
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#include <getopt.h>
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#include <signal.h>
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#include <stdbool.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 <sysexits.h>
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#include <unistd.h>
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#define EXIT_TIMEOUT 124
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static sig_atomic_t sig_chld = 0;
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static sig_atomic_t sig_term = 0;
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static sig_atomic_t sig_alrm = 0;
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static sig_atomic_t sig_ign = 0;
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static void
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usage(void)
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{
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fprintf(stderr, "Usage: %s [--signal sig | -s sig] [--preserve-status]"
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" [--kill-after time | -k time] [--foreground] <duration> <command>"
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" <arg ...>\n", getprogname());
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exit(EX_USAGE);
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}
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static double
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parse_duration(const char *duration)
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{
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double ret;
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char *end;
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ret = strtod(duration, &end);
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if (ret == 0 && end == duration)
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errx(125, "invalid duration");
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if (end == NULL || *end == '\0')
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return (ret);
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if (end != NULL && *(end + 1) != '\0')
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errx(EX_USAGE, "invalid duration");
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switch (*end) {
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case 's':
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break;
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case 'm':
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ret *= 60;
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break;
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case 'h':
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ret *= 60 * 60;
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break;
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case 'd':
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ret *= 60 * 60 * 24;
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break;
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default:
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errx(125, "invalid duration");
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}
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if (ret < 0 || ret >= 100000000UL)
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errx(125, "invalid duration");
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return (ret);
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}
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static int
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parse_signal(const char *str)
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{
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int sig, i;
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const char *errstr;
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sig = strtonum(str, 0, sys_nsig, &errstr);
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if (errstr == NULL)
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return (sig);
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if (strncasecmp(str, "SIG", 3) == 0)
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str += 3;
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for (i = 1; i < sys_nsig; i++) {
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if (strcasecmp(str, sys_signame[i]) == 0)
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return (i);
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}
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errx(125, "invalid signal");
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}
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static void
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sig_handler(int signo)
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{
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if (sig_ign != 0 && signo == sig_ign) {
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sig_ign = 0;
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return;
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}
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switch(signo) {
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case 0:
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case SIGINT:
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case SIGHUP:
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case SIGQUIT:
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case SIGTERM:
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sig_term = signo;
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break;
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case SIGCHLD:
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sig_chld = 1;
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break;
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case SIGALRM:
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sig_alrm = 1;
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break;
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}
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}
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static void
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set_interval(double iv)
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{
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struct itimerval tim;
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memset(&tim, 0, sizeof(tim));
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tim.it_value.tv_sec = (time_t)iv;
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iv -= (time_t)iv;
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tim.it_value.tv_usec = (suseconds_t)(iv * 1000000UL);
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if (setitimer(ITIMER_REAL, &tim, NULL) == -1)
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err(EX_OSERR, "setitimer()");
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}
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int
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main(int argc, char **argv)
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{
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int ch;
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unsigned long i;
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int foreground, preserve;
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int error, pstat, status;
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int killsig = SIGTERM;
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pid_t pgid, pid, cpid;
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double first_kill;
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double second_kill;
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bool timedout = false;
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bool do_second_kill = false;
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struct sigaction signals;
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int signums[] = {
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-1,
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SIGTERM,
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SIGINT,
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SIGHUP,
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SIGCHLD,
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SIGALRM,
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SIGQUIT,
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};
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foreground = preserve = 0;
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second_kill = 0;
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cpid = -1;
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pgid = -1;
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const struct option longopts[] = {
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{ "preserve-status", no_argument, &preserve, 1 },
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{ "foreground", no_argument, &foreground, 1 },
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{ "kill-after", required_argument, NULL, 'k'},
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{ "signal", required_argument, NULL, 's'},
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{ "help", no_argument, NULL, 'h'},
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{ NULL, 0, NULL, 0 }
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};
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while ((ch = getopt_long(argc, argv, "+k:s:h", longopts, NULL)) != -1) {
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switch (ch) {
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case 'k':
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do_second_kill = true;
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second_kill = parse_duration(optarg);
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break;
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case 's':
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killsig = parse_signal(optarg);
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break;
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case 0:
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break;
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case 'h':
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default:
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usage();
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break;
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}
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}
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argc -= optind;
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argv += optind;
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if (argc < 2)
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usage();
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first_kill = parse_duration(argv[0]);
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argc--;
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argv++;
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if (!foreground) {
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pgid = setpgid(0,0);
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if (pgid == -1)
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err(EX_OSERR, "setpgid()");
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}
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memset(&signals, 0, sizeof(signals));
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sigemptyset(&signals.sa_mask);
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if (killsig != SIGKILL && killsig != SIGSTOP)
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signums[0] = killsig;
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for (i = 0; i < sizeof(signums) / sizeof(signums[0]); i ++)
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sigaddset(&signals.sa_mask, signums[i]);
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signals.sa_handler = sig_handler;
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signals.sa_flags = SA_RESTART;
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for (i = 0; i < sizeof(signums) / sizeof(signums[0]); i ++)
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if (signums[i] != -1 && signums[i] != 0 &&
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sigaction(signums[i], &signals, NULL) == -1)
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err(EX_OSERR, "sigaction()");
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signal(SIGTTIN, SIG_IGN);
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signal(SIGTTOU, SIG_IGN);
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pid = fork();
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if (pid == -1)
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err(EX_OSERR, "fork()");
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else if (pid == 0) {
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/* child process */
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signal(SIGTTIN, SIG_DFL);
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signal(SIGTTOU, SIG_DFL);
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error = execvp(argv[0], argv);
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if (error == -1) {
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if (errno == ENOENT)
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err(127, "exec(%s)", argv[0]);
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else
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err(126, "exec(%s)", argv[0]);
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}
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}
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if (sigprocmask(SIG_BLOCK, &signals.sa_mask, NULL) == -1)
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err(EX_OSERR, "sigprocmask()");
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/* parent continues here */
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set_interval(first_kill);
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for (;;) {
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sigemptyset(&signals.sa_mask);
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sigsuspend(&signals.sa_mask);
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if (sig_chld) {
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sig_chld = 0;
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while (((cpid = wait(&status)) < 0) && errno == EINTR)
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continue;
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if (cpid == pid) {
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pstat = status;
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break;
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}
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} else if (sig_alrm) {
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sig_alrm = 0;
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timedout = true;
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if (!foreground)
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killpg(pgid, killsig);
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else
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kill(pid, killsig);
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if (do_second_kill) {
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set_interval(second_kill);
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second_kill = 0;
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sig_ign = killsig;
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killsig = SIGKILL;
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} else
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break;
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} else if (sig_term) {
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if (!foreground)
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killpg(pgid, killsig);
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else
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kill(pid, sig_term);
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if (do_second_kill) {
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set_interval(second_kill);
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second_kill = 0;
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sig_ign = killsig;
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killsig = SIGKILL;
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} else
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break;
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}
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}
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while (cpid != pid && wait(&pstat) == -1) {
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if (errno != EINTR)
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err(EX_OSERR, "waitpid()");
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}
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if (WEXITSTATUS(pstat))
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pstat = WEXITSTATUS(pstat);
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else if(WIFSIGNALED(pstat))
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pstat = 128 + WTERMSIG(pstat);
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if (timedout && !preserve)
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pstat = EXIT_TIMEOUT;
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return (pstat);
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}
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