Question

How to get process current and parent ID in C

Answer 1

#include <stdio.h>
#include <sys/wait.h>
#include <unistd.h>

int main() {
    int id = fork();
    
    if (id == 0) {
        sleep(1);
    }
    printf("Current ID: %d, parent ID: %d\n", getpid(), getppid());
    
    int result = wait(NULL);
    
    if (result == -1) {
        printf("No children\n");
    } else {
        printf("finished execution\n");
    }
    
    return 0;
}



/*
run:

Current ID: 20, parent ID: 19
No children
Current ID: 19, parent ID: 8
finished execution

*/

 

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