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#include <errno.h>
#include <limits.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <unistd.h>
int
main (int argc, char *argv[])
{
const char *program_name = argv[0];
double timeout;
if (argc < 3)
{
fprintf (stderr,
"setitimer-helper: runs a program with a virtual CPU limit\n"
"usage: %s TIMEOUT PROGRAM [ARG...]\n"
" where TIMEOUT is the virtual CPU limit, in seconds,\n"
" and remaining arguments specify the program to run\n"
" and its argument.\n",
program_name);
return EXIT_FAILURE;
}
timeout = strtod (argv[1], NULL);
if (timeout >= 0.0 && timeout < LONG_MAX)
{
struct itimerval it;
it.it_interval.tv_sec = 0;
it.it_interval.tv_usec = 0;
it.it_value.tv_sec = timeout;
it.it_value.tv_usec = (timeout - floor (timeout)) * 1000000;
if (setitimer (ITIMER_VIRTUAL, &it, NULL) < 0)
fprintf (stderr, "%s: setitimer: %s\n",
program_name, strerror (errno));
}
else
fprintf (stderr, "%s: invalid timeout value \"%s\"\n",
program_name, argv[1]);
execvp (argv[2], &argv[2]);
fprintf (stderr, "%s: couldn't exec \"%s\": %s\n",
program_name, argv[2], strerror (errno));
return EXIT_FAILURE;
}
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