pthread_atfork - register fork handlers
#include <sys/types.h> #include <unistd.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(), in the context of the thread that called fork(). The prepare fork handler is called before fork() processing commences. The parent fork handle is called after fork() processing completes in the parent process. The child fork handler is called after fork() processing completes in the child process. If no handling is desired at one or more of these three points, the corresponding fork handler address(es) may be set to NULL.
The order of calls to pthread_atfork() is significant. The parent and child fork handlers are called in the order in which they were established by calls to pthread_atfork(). The prepare fork handlers are called in the opposite order.
Upon successful completion, pthread_atfork() returns a value of zero. Otherwise, an error number is returned to indicate the error.
The pthread_atfork() function will fail if:
- Insufficient table space exists to record the fork handler addresses.
The pthread_atfork() function will not return an error code of [EINTR].
atexit(), fork(), <sys/types.h>
Derived from the POSIX Threads Extension (1003.1c-1995) including PASC 1003.1c-95.