NAME

pthread_atfork — register fork handlers

LIBRARY

POSIX Threads Library (libpthread, -lpthread)

#include <pthread.h>

int
pthread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void));

The pthread_atfork() function declares fork handlers to be called before and after fork(2), in the context of the thread that called fork(2).

The handlers registered with pthread_atfork() are called at the moments in time described below:

prepare: Before fork(2) processing commences in the parent process. If more than one prepare handler is registered they will be called in the opposite order they were registered.
parent: After fork(2) completes in the parent process. If more than one parent handler is registered they will be called in the same order they were registered.
child: After fork(2) processing completes in the child process. If more than one child handler is registered they will be called in the same order they were registered.

If no handling is desired at one or more of these three points, a null pointer may be passed as the corresponding fork handler.

If successful, the pthread_atfork() function will return zero. Otherwise an error number will be returned to indicate the error.

The pthread_atfork() function will fail if:

[ENOMEM]: Insufficient table space exists to record the fork handler addresses.

The pthread_atfork() function is expected to conform to IEEE Std 1003.1 (“POSIX.1”).

This manpage was written by Alex Vasylenko <lxv@omut.org>.