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  1. #include<stdio.h>   
  2. #include<sys/wait.h>
  3. #include<stdlib.h>
  4. #include <unistd.h>
  5.  
  6. int main()
  7. {
  8. 	pid_t pid;
  9. 	if(pid = fork() < 0){
  10. 		printf("Fork Error.!!!\n");
  11. 	}else {
  12. 		if(pid == 0){
  13. 			if((pid = fork()) < 0){
  14. 				printf("Fork2 Error.!!!\n");
  15. 			}else if(pid > 0){
  16. 				return 0;
  17. 			}
  18. 			printf("Second Child, parent id: %d\n", getppid());
  19. 			return 0;
  20. 		}
  21. 	}
  22. 	if(waitpid(pid, NULL, 0) != pid){
  23. 		printf("Waitpid Error.!!!\n");
  24. 	}
  25. 	sleep(2);
  26. 	return 0;
  27. }
Success #stdin #stdout 0.01s 2680KB
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Standard input is empty
stdout
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Second Child, parent id: 1
Second Child, parent id: 1
https://ideone.com/Z2N0e
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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