Lab 1 Process System Calls in C

Objective:

• To understand and implement Process system calls in C, including fork(), exec(), wait(), creating and terminating processes.

Code Overview:

The provided C program demonstrates the creation of a child process using fork(), executing a command in the child process using execl(), and waiting for the child process to complete using wait(). It also showcases the handling of the child process termination status.

P1.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
 
int main() {
    pid_t pid;
    int status;
    printf("Starting main program...\n");
       // Fork a child process
    pid = fork();
       if (pid < 0) {
        fprintf(stderr, "Fork failed\n");
        return 1;
    } else if (pid == 0) {
        // Child process
        printf("Child process executing...\n");
           // Executing a command using execl
        execl("/bin/ls", "ls", "-l", NULL);
        // This line will only be reached if execl fails
        perror("execl");
        exit(EXIT_FAILURE);
    } else {
        // Parent process
        printf("Parent process waiting for child...\n");
               // Wait for the child process to finish
        wait(&status);
               if (WIFEXITED(status)) {
            printf("Child process terminated with status: %d\n", WEXITSTATUS(status));
        } else {
            printf("Child process terminated abnormally\n");
        }
                printf("Parent process exiting...\n");
    }
    return 0;
}

1. OUTPUT