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/* Runs specified command, and detach it from terminal, if it is still
* running after DURATION.
*
* This utility is written specially for needs of integration `runit'
* init system into Debian, so DURATION is hardcoded
*/
#define DURATION 90 /* seconds */
#include <assert.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#define write2(x) write(2, x "", sizeof(x) - 1)
static sig_atomic_t child_finished = 0;
static void signal_handler(int num) {
if (num == SIGCHLD)
child_finished = 1;
}
int main(int argc, char **argv) {
pid_t pid;
signal(SIGCHLD, &signal_handler);
signal(SIGALRM, &signal_handler);
pid = fork();
if (pid == -1) {
write2("async-timeout: fork() failed\n");
return 1;
}
if (argc < 2) {
write2("usage: async-timeout prog [args ...]\n");
return 1;
}
if (pid == 0) { /* child */
execvp(argv[1], argv + 1);
write2("async-timeout: exec() failed\n");
return 1;
} else { /* parent */
alarm(DURATION);
pause(); /* wait for signal, either SIGCHLD or SIGALRM */
if (child_finished) {
int status;
wait(&status);
if (WIFEXITED(status)) {
return WEXITSTATUS(status);
} else if (WIFSIGNALED(status)) {
return 128 + WTERMSIG(status);
} else { /* should not happen */
assert("panic: unaccessible code" && 0);
return 128;
}
} else {
/* Child is reparented by pid1 */
return 0;
}
};
assert("panic: unaccessible code" && 0);
return 0;
}
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