CODEWITHSUNDEEP
coperating-systemforkpid
Rocket
Rocket

Reputation: 123

How to obtain the child process PID in C

In order to get the PID of the child process I am doing this.

pid_t pid;
pid=fork();
if(pid==0){
  //child's work
}else{
  printf("The child's PID is %d",pid);
}

I want to print the child's pid from parent! So is it ok if I printf pid or do I need to use getpid()?

Upvotes: 0

Views: 1839

Answers (2)

Atharva
Atharva

Reputation: 53

I think this sums up the question :

#include <stdio.h>
#include <unistd.h>

int main(){
    pid_t pid;
    pid = fork();
    if(pid == 0){
        printf("In child => Own pid : %d\n", getpid());
        printf("In child => Parent's pid : %d\n", getppid());
    }
    else{
      printf("In Parent => Child's pid is %d\n", pid);
      printf("In Parent => Own pid : %d\n", getpid());
    }
    return 0;   
}

Upvotes: 1

anastaciu
anastaciu

Reputation: 23832

On success fork returns the pid of the child process, so pid will be the pid of the child process, So I'd say it's correct.

getpid is to get the pid of the current process, so it's not suited to get the child's pid.

Upvotes: 1

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