How to get the running process’ parent process’ ID in C / C++?
How to get the running process’ parent process’ ID in C / C++?
In C and C++, you can call the getppid() library function which is a function from the POSIX library.
#include <sys/types.h>
#include <unistd.h>
pid_t getppid(void);
getppid() returns the process ID of the parent of the calling process.
Example usage:
getppid.c
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
int main()
{
pid_t ppid = getppid();
printf("ppid: %lun", ppid);
}
Build and run it:
$ gcc getppid.c -o s && ./s
ppid: 22312
Verify the pid of the parent process (the Bash shell):
$ echo $$
22312