getpid()

Updated: May 06, 2022

Get the process ID

Synopsis:

#include <unistd.h>

pid_t getpid( void );

This function is declared in <process.h>, which <unistd.h> includes.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The getpid() function gets the process ID for the calling process.

Returns:

The process ID of the calling process.

Examples:

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

int main ( void )
{
    printf( "I'm process %d\n", getpid() );
    return EXIT_SUCCESS;
}

Classification:

POSIX 1003.1

Safety:  
Cancellation point No
Interrupt handler No
Signal handler Yes
Thread Yes