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/* run a command with a limited timeout
tridge@samba.org, June 2005
attempt to be as portable as possible (fighting posix all the way)
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
static void usage(void)
{
printf("usage: timelimit <time> <command>\n");
}
static void sig_alrm(int sig)
{
kill(0, SIGKILL);
exit(1);
}
static void sig_term_kill(int sig)
{
static int c = 0;
if (c > 2) {
kill(0, SIGKILL);
exit(0);
}
c++;
}
static void sig_term(int sig)
{
kill(0, SIGTERM);
signal(SIGTERM, sig_term_kill);
}
int main(int argc, char *argv[])
{
int maxtime, ret=1;
if (argc < 3) {
usage();
exit(1);
}
if (setpgrp() == -1) {
perror("setpgrp");
exit(1);
}
maxtime = atoi(argv[1]);
signal(SIGALRM, sig_alrm);
alarm(maxtime);
signal(SIGTERM, sig_term);
if (fork() == 0) {
execvp(argv[2], argv+2);
}
do {
int status;
pid_t pid = wait(&status);
if (pid != -1) {
ret = WEXITSTATUS(status);
} else if (errno == ECHILD) {
break;
}
} while (1);
exit(ret);
}
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