osx man page for pthread_atfork

PTHREAD_ATFORK(3)					   BSD Library Functions Manual 					 PTHREAD_ATFORK(3)

NAME
     pthread_atfork -- register handlers to be called before and after fork()

SYNOPSIS
     #include <pthread.h>

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

DESCRIPTION
     The pthread_atfork() function is used to register functions to be called before and after fork().	The prepare handler is called before
     fork(), while the parent and child handlers are called after fork() in the parent and child process respectively.	The prepare handlers are
     called in reverse order of their registration, while parent and child handlers are called in the order in which they were registered.  Any of
     the handlers may be NULL.

     Important: only async-signal-safe functions are allowed on the child side of fork().  See sigaction(2) for details.

RETURN VALUES
     If successful, the pthread_atfork() function will return zero; otherwise an error number will be returned to indicate the error.

ERRORS
     pthread_atfork() will fail if:

     [ENOMEM]		The system lacked the necessary resources to add another handler to the list.

SEE ALSO
     fork(2)

STANDARDS
     pthread_atfork() conforms to ISO/IEC 9945-1:1996 (``POSIX.1'').

BSD
								  August 12, 2004							       BSD