#include <unistd.h>
#include <sys/wait.h>
#include <stdio.h>

enum { BASEEXITCODE = 128 };

int
mysys(const char *str)
{
    int pid = fork(), status;
    if (pid == -1) {
        return -1;
    } else if (!pid) {
        if (execl("/bin/sh", "sh", "-c", str, (char *) 0) == -1) {
            _exit(BASEEXITCODE - 1);
        }
    }


    waitpid(pid, &status, 0);
    if (WIFEXITED(status)) {
        return WEXITSTATUS(status);
    } else {
        return (BASEEXITCODE + WTERMSIG(status));
    }
}