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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 = fork(); // First fork
  8.  
  9.     if (pid == 0) { // Child process
  10.         printf("Child 1: PID=%d\n", getpid());
  11.  
  12.         // Forking again
  13.         pid_t pid_child2 = fork();
  14.  
  15.         if (pid_child2 == 0) { // Child of child process
  16.             printf("Child 2: PID=%d, Parent PID=%d\n", getpid(), getppid());
  17.             printf("Child 2: Exiting...\n");
  18.             exit(EXIT_SUCCESS);
  19.         } else if (pid_child2 > 0) { // Parent process (Child 1)
  20.             printf("Child 1: Waiting for Child 2 to finish...\n");
  21.             waitpid(pid_child2, NULL, 0); // Wait for Child 2 to finish
  22.             printf("Child 1: Exiting...\n");
  23.             exit(EXIT_SUCCESS);
  24.         } else { // Error handling for second fork
  25.             perror("fork");
  26.             exit(EXIT_FAILURE);
  27.         }
  28.     } else if (pid > 0) { // Parent process
  29.         printf("Parent: PID=%d\n", getpid());
  30.         printf("Parent: Waiting for Child 1 to finish...\n");
  31.         waitpid(pid, NULL, 0); // Wait for Child 1 to finish
  32.         printf("Parent: Exiting...\n");
  33.     } else { // Error handling for first fork
  34.         perror("fork");
  35.         exit(EXIT_FAILURE);
  36.     }
  37.  
  38.     return 0;
  39. }
  40.  
Success #stdin #stdout 0.01s 5284KB
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stdin
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ls | sort
stdout
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Child 1: PID=1157256
Child 2: PID=1157257, Parent PID=1157256
Child 2: Exiting...
Child 1: PID=1157256
Child 1: Waiting for Child 2 to finish...
Child 1: Exiting...
Parent: PID=1157253
Parent: Waiting for Child 1 to finish...
Parent: Exiting...
https://ideone.com/54uCkI
language:
C (gcc 8.3)
created:
16 days ago
visibility:
public

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