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  1. #include <stdio.h>
  2. #include <sys/types.h>
  3. #include <unistd.h>  // Include this for fork(), getpid(), getppid(), and sleep()
  4.  
  5. int main(void)
  6. {
  7.     pid_t pid;
  8.     printf("BEFORE FORK\n");
  9.     pid = fork();
  10.  
  11.     if (pid > 0) {
  12.         // Parent process
  13.         sleep(0);  // This is unnecessary, but you can remove it or leave it as is
  14.         printf("PARENT_PID: %d, RPID: %d, CHILD PID: %d\n", getpid(), getppid(), pid);
  15.     }
  16.     else if (pid == 0) {
  17.         // Child process
  18.         printf("CHILD_PID: %d, RPID: %d\n", getpid(), getppid());
  19.     }
  20.     else {
  21.         // Error in fork()
  22.         printf("FORK ERROR\n");
  23.     }
  24.  
  25.     printf("BOTH PROCESSES CONTINUE FROM HERE\n");
  26.  
  27.     return 0;
  28. }
  29.  
Success #stdin #stdout 0.01s 5276KB
comments (?)
stdin
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Standard input is empty
stdout
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BEFORE FORK
CHILD_PID: 2326428, RPID: 2326425
BOTH PROCESSES CONTINUE FROM HERE
BEFORE FORK
PARENT_PID: 2326425, RPID: 2326424, CHILD PID: 2326428
BOTH PROCESSES CONTINUE FROM HERE
https://ideone.com/8GfziA
language:
C++ (gcc 8.3)
created:
11 days ago
visibility:
public

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