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#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
int
main(int argc, char **argv)
{
pid_t pid;
int rstatus;
char *new_argv[] = { NULL, "3", NULL };
if (argc != 2) {
fprintf(stderr, "Usage: %s exepath\n", argv[0]);
return -1;
}
new_argv[0] = argv[1];
pid = fork();
if (pid < 0)
{
perror("fork");
return -1;
}
if (pid == 0) /* child process */
{
/* Actually run the command. */
if (execv(new_argv[0], new_argv) < 0)
perror("execv");
_exit(1);
}
if (waitpid(pid, &rstatus, 0) < 0) {
perror("waitpid");
return -1;
}
if (WIFEXITED(rstatus))
return WEXITSTATUS(rstatus);
return -1;
}
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