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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <unistd.h>
  4. #include <sys/types.h>
  5. #include <sys/wait.h>
  6.  
  7. int main() {
  8.     pid_t pid;
  9.  
  10.     printf("Starting program (PID: %d)\n", getpid());
  11.  
  12.     // fork() system call to create a new process
  13.     pid = fork();
  14.  
  15.     if (pid < 0) {
  16.         // Error occurred
  17.         fprintf(stderr, "Fork Failed\n");
  18.         return 1;
  19.     }
  20.     else if (pid == 0) {
  21.         // Child Process
  22.         printf("\n[Child] Created (PID: %d)\n", getpid());
  23.         printf("[Child] Parent PID: %d\n", getppid());
  24.         printf("[Child] Performing task and exiting...\n");
  25.         sleep(2); // Simulate work
  26.         exit(0); // Exit system call
  27.     }
  28.     else {
  29.         // Parent Process
  30.         printf("\n[Parent] Created child with PID: %d\n", pid);
  31.         printf("[Parent] Waiting for child to finish...\n");
  32.  
  33.         // wait() system call to wait for child completion
  34.         wait(NULL); 
  35.  
  36.         printf("\n[Parent] Child finished.\n");
  37.         printf("[Parent] Exiting.\n");
  38.     }
  39.  
  40.     return 0;
  41. }
  42.  
Success #stdin #stdout 0s 5308KB
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stdin
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Standard input is empty
stdout
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Starting program (PID: 3372126)

[Child] Created (PID: 3372129)
[Child] Parent PID: 3372126
[Child] Performing task and exiting...
Starting program (PID: 3372126)

[Parent] Created child with PID: 3372129
[Parent] Waiting for child to finish...

[Parent] Child finished.
[Parent] Exiting.
https://ideone.com/gZ6j7I
language:
C (gcc 8.3)
created:
7 hours ago
visibility:
public

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