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#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
int volatile got_sigchld, got_sigalrm;
void
sighan (int sig)
{
switch (sig)
{
case SIGCHLD:
got_sigchld = 1;
break;
case SIGALRM:
got_sigalrm = 1;
break;
}
}
int
main (int argc, char **argv)
{
char *progname = argv[0];
unsigned long n;
char *p;
pid_t pid, ret;
int status;
if (argc < 3)
{
fprintf (stderr, "usage: %s TIMEOUT COMMAND ...\n", progname);
exit (1);
}
errno = 0;
n = strtoul (argv[1], &p, 10);
if (errno || *p || n == 0)
{
fprintf (stderr, "%s: %s is not a valid timeout\n", progname, argv[1]);
exit (1);
}
argc -= 2;
argv += 2;
signal (SIGALRM, sighan);
signal (SIGCHLD, sighan);
pid = fork ();
if (pid == -1)
{
perror ("fork");
exit (127);
}
if (pid == 0)
{
execvp (argv[0], argv);
perror (argv[0]);
exit (127);
}
alarm (n);
while (1)
{
pause ();
if (got_sigchld)
{
alarm (0);
break;
}
if (got_sigalrm)
{
fprintf (stderr, "%s: timed out\n", progname);
kill (pid, SIGKILL);
exit (127);
}
}
ret = wait (&status);
if (ret != pid)
{
perror ("wait");
exit (127);
}
if (WIFEXITED (status))
return WEXITSTATUS (status);
if (WIFSIGNALED (status))
fprintf (stderr, "%s: %s terminated on signal %d\n", progname, argv[0],
WTERMSIG (status));
else if (WIFSTOPPED (status))
fprintf (stderr, "%s: %s stopped\n", progname, argv[0]);
else
fprintf (stderr, "%s: %s exited with unrecognized status %d\n",
progname, argv[0], status);
return 127;
}
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