// simple example of posix_spawn
// ./spawn_cat f.txt
// The child will run /usr/bin/cat

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <spawn.h>
#include <sys/wait.h>
#include <errno.h>
#include <string.h>

int main(int argc, char *argv[]) {
        pid_t pid;
        extern char **environ;
        
        if (argc < 2) {
                fprintf(stderr, "Usage: %s <filename>\n", argv[0]);
                return 1;
        }
        
        //TODO
        char *cat_argv[] = {"/usr/bin/cat",argv[1], NULL};
        
        //TODO
        int ret = posix_spawn(&pid, "/usr/bin/cat", NULL, NULL, cat_argv, environ);  
    
        if (ret != 0) {
                errno = ret;
                perror("spawn");
                return 1;
        }

        int exit_status;
        if (waitpid(pid, &exit_status, 0) == -1) {
                perror("waitpid");
                return 1;
        }

        printf("/bin/cat exit status was %d\n", exit_status);
        return 0;
}