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  1. /*    main program illustrating the UNIX fork() system call. 
  2. Compile using cc -o main main.c
  3. */
  4. #include <stdio.h>
  5. main() {
  6. int fork(), value;
  7. int childpid[4];
  8.  
  9. for(int i=0;i<4;i++){
  10. childpid[i] = fork();
  11.  
  12. if(childpid == -1) {
  13. 	perror("can’t fork. Help!!");
  14. 	exit(-1);
  15. 	} 
  16.  
  17.  else if(childpid[i] == 0) {
  18. 	printf("child: my_process_id= %d,parent_process_id=%d\n", getpid(), getppid());
  19. } 
  20.  
  21. 	else {
  22. 		printf("i = %d \nParent: my_process_id=%d,my_child’s_process_id=%d\n",i, getpid(), childpid);
  23. 		continue;
  24. 		}
  25. 	}
  26. } 
  27.  
Success #stdin #stdout 0s 5464KB
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stdin
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Standard input is empty
stdout
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i = 0 
Parent: my_process_id=30397,my_child’s_process_id=122122528
i = 1 
Parent: my_process_id=30397,my_child’s_process_id=122122528
i = 2 
Parent: my_process_id=30397,my_child’s_process_id=122122528
i = 3 
Parent: my_process_id=30397,my_child’s_process_id=122122528
i = 0 
Parent: my_process_id=30397,my_child’s_process_id=122122528
i = 1 
Parent: my_process_id=30397,my_child’s_process_id=122122528
i = 2 
Parent: my_process_id=30397,my_child’s_process_id=122122528
child: my_process_id= 30403,parent_process_id=1
i = 0 
Parent: my_process_id=30397,my_child’s_process_id=122122528
i = 1 
Parent: my_process_id=30397,my_child’s_process_id=122122528
child: my_process_id= 30402,parent_process_id=1
i = 3 
Parent: my_process_id=30402,my_child’s_process_id=122122528
https://ideone.com/iknPtH
language:
C (gcc 8.3)
created:
1 year ago
visibility:
public

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