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  1. #include <stdio.h>
  2. #include <sys/types.h>
  3. #include <unistd.h> // Include this for sleep() and fork()
  4.  
  5. int main(void)
  6. {
  7.     pid_t pid;
  8.     printf("BEFORE FORK\n");
  9.     pid = fork(); // Fork system call
  10.  
  11.     if (pid > 0)
  12.     {
  13.         // Parent process code
  14.         sleep(1); // Allow child to execute first
  15.         printf("PARENT_PID:%d RPID:%d, CHILD PID:%d \n", getpid(), getppid(), pid);
  16.     }
  17.     else if (pid == 0)
  18.     {
  19.         // Child process code
  20.         printf("CHILD_PID:%d RPID:%d\n", getpid(), getppid());
  21.     }
  22.     else
  23.     {
  24.         // Error occurred in fork()
  25.         printf("FORK ERROR\n");
  26.     }
  27.  
  28.     printf("BOTH PROCESS CONTINUE FROM HERE\n");
  29.  
  30.     return 0; // Return statement for main
  31. }
  32.  
Success #stdin #stdout 0s 5292KB
comments (?)
stdin
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Standard input is empty
stdout
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BEFORE FORK
CHILD_PID:2333833 RPID:2333830
BOTH PROCESS CONTINUE FROM HERE
BEFORE FORK
PARENT_PID:2333830 RPID:2333829, CHILD PID:2333833 
BOTH PROCESS CONTINUE FROM HERE
https://ideone.com/9Xaj6E
language:
C++ (gcc 8.3)
created:
11 days ago
visibility:
public

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