When not using the --foreground option timeout(1) is supported to signal all command children hierarchy, timeout(1) now acquire the reaper to ensure this really happens and no children process can escaper from timeout(1) control
357 lines
7.6 KiB
C
357 lines
7.6 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/procctl.h>
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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 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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struct procctl_reaper_status info;
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struct procctl_reaper_kill killemall;
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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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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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/* Aquire a reaper */
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if (procctl(P_PID, getpid(), PROC_REAP_ACQUIRE, NULL) == -1)
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err(EX_OSERR, "Fail to acquire the reaper");
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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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if (!foreground)
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break;
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}
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if (!foreground) {
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procctl(P_PID, getpid(), PROC_REAP_STATUS,
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&info);
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if (info.rs_children == 0) {
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cpid = pid;
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break;
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}
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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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killemall.rk_sig = killsig;
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killemall.rk_flags = 0;
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procctl(P_PID, getpid(), PROC_REAP_KILL,
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&killemall);
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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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killemall.rk_sig = sig_term;
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killemall.rk_flags = 0;
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procctl(P_PID, getpid(), PROC_REAP_KILL,
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&killemall);
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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 (!foreground)
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procctl(P_PID, getpid(), PROC_REAP_RELEASE, NULL);
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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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