// This program creates a fork and uses execl to run the ls command
// in the child process. The parent process waits for the child to
// finish and then prints a message containing the child's exit status.

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

#define LS "/run/current-system/sw/bin/ls"
#define PATH "/home/dm"

int main() {
    pid_t pid;
    int status;

    pid = fork();
    if (pid < 0) {
        perror("fork");
        exit(1);
    }

    if (pid == 0) {
        // Child process
        execl(LS, "ls", "-lasi", PATH, NULL);
        // this line will only be reached if execl fails, meaning that it 
        // will not influence the status
        perror("execl");
        exit(3);
    }

    // Parent process
    wait(&status);
    printf("exit status: 0x%04x\n", status);
    printf("Child exited with status %d\n", WEXITSTATUS(status));

    return 0;
}