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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <unistd.h>
  4. #include <sys/wait.h>
  5.  
  6. int main() {
  7.     pid_t pid, wpid;
  8.     int status;
  9.  
  10.     printf("Parent process started (PID: %d)\n", getpid());
  11.  
  12.     // Create a child process using fork()
  13.     pid = fork();
  14.  
  15.     if (pid < 0) {
  16.         // fork failed
  17.         perror("fork failed");
  18.         exit(EXIT_FAILURE);
  19.     } else if (pid == 0) {
  20.         // Child process
  21.         printf("Child process (PID: %d), parent PID: %d\n", getpid(), getppid());
  22.  
  23.         // Replace the child process with a new program using execl
  24.         printf("Child process will now execute 'ls -l' command\n");
  25.         execl("/bin/ls", "ls", "-l", NULL);
  26.  
  27.         // If execl returns, it means it failed
  28.         perror("execl failed");
  29.         exit(EXIT_FAILURE);
  30.     } else {
  31.         // Parent process
  32.         printf("Parent process waiting for child (PID: %d) to complete\n", pid);
  33.  
  34.         // Wait for the child process to complete
  35.         wpid = wait(&status);
  36.  
  37.         if (wpid == -1) {
  38.             perror("wait error");
  39.             exit(EXIT_FAILURE);
  40.         }
  41.  
  42.         if (WIFEXITED(status)) {
  43.             printf("Child process %d exited with status %d\n", wpid, WEXITSTATUS(status));
  44.         } else if (WIFSIGNALED(status)) {
  45.             printf("Child process %d killed by signal %d\n", wpid, WTERMSIG(status));
  46.         }
  47.  
  48.         printf("Parent process (PID: %d) exiting\n", getpid());
  49.         exit(EXIT_SUCCESS);
  50.     }
  51. }
Success #stdin #stdout 0.01s 5312KB
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stdin
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Standard input is empty
stdout
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total 16
-rwxr-xr-x 1 root root 14312 May 21 10:16 prog
Parent process started (PID: 3589790)
Parent process waiting for child (PID: 3589793) to complete
Child process 3589793 exited with status 0
Parent process (PID: 3589790) exiting
https://ideone.com/4D2JPN
language:
C (gcc 8.3)
created:
8 hours ago
visibility:
public

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