#include <sys/types.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <getopt.h>
#include <limits.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define EXIT_TIMEOUT 124
static volatile sig_atomic_t sig_chld = 0;
static volatile sig_atomic_t sig_term = 0;
static volatile sig_atomic_t sig_alrm = 0;
static volatile sig_atomic_t sig_ign = 0;
static void __dead
usage(void)
{
fprintf(stderr,
"usage: timeout [-fp] [-k time] [-s signal] duration command"
" [arg ...]\n");
exit(1);
}
static double
parse_duration(const char *duration)
{
double ret;
char *suffix;
ret = strtod(duration, &suffix);
if (ret == 0 && suffix == duration)
errx(1, "duration is not a number");
if (ret < 0 || ret >= 100000000UL)
errx(1, "duration out of range");
if (suffix == NULL || *suffix == '\0')
return (ret);
if (suffix[1] != '\0')
errx(1, "duration unit suffix too long");
switch (*suffix) {
case 's':
break;
case 'm':
ret *= 60;
break;
case 'h':
ret *= 60 * 60;
break;
case 'd':
ret *= 60 * 60 * 24;
break;
default:
errx(1, "duration unit suffix is invalid");
}
return (ret);
}
static int
parse_signal(const char *str)
{
long long sig;
const char *errstr;
if (isalpha((unsigned char)*str)) {
int i;
if (strncasecmp(str, "SIG", 3) == 0)
str += 3;
for (i = 1; i < NSIG; i++) {
if (strcasecmp(str, sys_signame[i]) == 0)
return (i);
}
errx(1, "invalid signal name");
}
sig = strtonum(str, 1, NSIG, &errstr);
if (errstr != NULL)
errx(1, "signal %s %s", str, errstr);
return (int)sig;
}
static void
sig_handler(int signo)
{
if (sig_ign != 0 && signo == sig_ign) {
sig_ign = 0;
return;
}
switch (signo) {
case SIGINT:
case SIGHUP:
case SIGQUIT:
case SIGTERM:
sig_term = signo;
break;
case SIGCHLD:
sig_chld = 1;
break;
case SIGALRM:
sig_alrm = 1;
break;
}
}
static void
set_interval(double iv)
{
struct itimerval tim;
memset(&tim, 0, sizeof(tim));
tim.it_value.tv_sec = (time_t)iv;
iv -= (double)tim.it_value.tv_sec;
tim.it_value.tv_usec = (suseconds_t)(iv * 1000000UL);
if (setitimer(ITIMER_REAL, &tim, NULL) == -1)
err(1, "setitimer");
}
int
main(int argc, char **argv)
{
int ch;
unsigned long i;
int foreground = 0, preserve = 0;
int pstat, status;
int killsig = SIGTERM;
pid_t pgid = 0, pid, cpid = 0;
double first_kill;
double second_kill = 0;
bool timedout = false;
bool do_second_kill = false;
struct sigaction signals;
int signums[] = {-1, SIGTERM, SIGINT, SIGHUP, SIGCHLD,
SIGALRM, SIGQUIT};
const struct option longopts[] = {
{ "preserve-status", no_argument, NULL, 'p'},
{ "foreground", no_argument, NULL, 'f'},
{ "kill-after", required_argument, NULL, 'k'},
{ "signal", required_argument, NULL, 's'},
{ "help", no_argument, NULL, 'h'},
{ NULL, 0, NULL, 0 }
};
if (pledge("stdio proc exec", NULL) == -1)
err(1, "pledge");
while ((ch = getopt_long(argc, argv, "+fk:ps:h", longopts, NULL))
!= -1) {
switch (ch) {
case 'f':
foreground = 1;
break;
case 'k':
do_second_kill = true;
second_kill = parse_duration(optarg);
break;
case 'p':
preserve = 1;
break;
case 's':
killsig = parse_signal(optarg);
break;
case 0:
break;
default:
usage();
break;
}
}
argc -= optind;
argv += optind;
if (argc < 2)
usage();
first_kill = parse_duration(argv[0]);
argc--;
argv++;
if (!foreground) {
pgid = setpgid(0, 0);
if (pgid == -1)
err(1, "setpgid");
}
memset(&signals, 0, sizeof(signals));
sigemptyset(&signals.sa_mask);
if (killsig != SIGKILL && killsig != SIGSTOP)
signums[0] = killsig;
for (i = 0; i < sizeof(signums) / sizeof(signums[0]); i++)
sigaddset(&signals.sa_mask, signums[i]);
signals.sa_handler = sig_handler;
signals.sa_flags = SA_RESTART;
for (i = 0; i < sizeof(signums) / sizeof(signums[0]); i++) {
if (signums[i] != -1 && signums[i] != 0 &&
sigaction(signums[i], &signals, NULL) == -1)
err(1, "sigaction");
}
signal(SIGTTIN, SIG_IGN);
signal(SIGTTOU, SIG_IGN);
pid = fork();
if (pid == -1)
err(1, "fork");
else if (pid == 0) {
signal(SIGTTIN, SIG_DFL);
signal(SIGTTOU, SIG_DFL);
execvp(argv[0], argv);
warn("%s", argv[0]);
_exit(errno == ENOENT ? 127 : 126);
}
if (pledge("stdio proc", NULL) == -1)
err(1, "pledge");
if (sigprocmask(SIG_BLOCK, &signals.sa_mask, NULL) == -1)
err(1, "sigprocmask");
set_interval(first_kill);
for (;;) {
sigemptyset(&signals.sa_mask);
sigsuspend(&signals.sa_mask);
if (sig_chld) {
sig_chld = 0;
while (((cpid = wait(&status)) < 0) && errno == EINTR)
continue;
if (cpid == pid) {
pstat = status;
break;
}
} else if (sig_alrm) {
sig_alrm = 0;
timedout = true;
if (!foreground)
killpg(pgid, killsig);
else
kill(pid, killsig);
if (do_second_kill) {
set_interval(second_kill);
second_kill = 0;
sig_ign = killsig;
killsig = SIGKILL;
} else
break;
} else if (sig_term) {
if (!foreground)
killpg(pgid, killsig);
else
kill(pid, (int)sig_term);
if (do_second_kill) {
set_interval(second_kill);
second_kill = 0;
sig_ign = killsig;
killsig = SIGKILL;
} else
break;
}
}
while (cpid != pid && wait(&pstat) == -1) {
if (errno != EINTR)
err(1, "wait");
}
if (WEXITSTATUS(pstat))
pstat = WEXITSTATUS(pstat);
else if (WIFSIGNALED(pstat))
pstat = 128 + WTERMSIG(pstat);
if (timedout && !preserve)
pstat = EXIT_TIMEOUT;
return (pstat);
}
