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  1. #include <stdio.h>
  2. #include <unistd.h>   // for fork(), getpid(), getppid()
  3. #include <sys/wait.h> // for wait()
  4. #include <stdlib.h>   // for exit()
  5.  
  6. int main() {
  7.     pid_t pid;
  8.  
  9.     // Create a child process
  10.     pid = fork();
  11.  
  12.     if (pid < 0) {
  13.         // fork() failed
  14.         perror("fork failed");
  15.         exit(1);
  16.     } 
  17.     else if (pid == 0) {
  18.         // Child process
  19.         printf("Child Process:\n");
  20.         printf("  PID: %d\n", getpid());
  21.         printf("  Parent PID: %d\n", getppid());
  22.     } 
  23.     else {
  24.         // Parent process
  25.         printf("Parent Process:\n");
  26.         printf("  PID: %d\n", getpid());
  27.         printf("  Parent PID: %d\n", getppid());
  28.  
  29.         // Parent waits for child to finish
  30.         wait(NULL);
  31.         printf("Child process (PID: %d) finished. Parent terminating.\n", pid);
  32.     }
  33.  
  34.     return 0;
  35. }
  36.  
Success #stdin #stdout 0.01s 5320KB
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stdin
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Standard input is empty
stdout
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Child Process:
  PID: 1655578
  Parent PID: 1655535
Parent Process:
  PID: 1655535
  Parent PID: 1655534
Child process (PID: 1655578) finished. Parent terminating.
https://ideone.com/DI3txw
language:
C (gcc 8.3)
created:
2 hours ago
visibility:
public

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