|PTHREAD_ATFORK(3)||Library Functions Manual||PTHREAD_ATFORK(3)|
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 prepare fork handler will be called before fork(2) processing commences. The parent fork handler will be called after fork(2) processing completes in the parent process. The child fork handler will be called after fork(2) 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
The order of calls to
significant. The parent and
child fork handlers will be called in the order in
which they were established by calls to
pthread_atfork(). The prepare
fork handlers will be called in the opposite order.
If a shared object is unloaded from process memory using
dlclose(3), then any functions
registered by calling
pthread_atfork() from that
shared object will be unregistered without being invoked. Note that it is
the source of the call to
matters, not the source of the functions that were registered.
pthread_atfork() will return a value of zero. Otherwise, an error number will be returned to indicate the error.
pthread_atfork() will fail if:
pthread_atfork() conforms to IEEE Std 1003.1-2004 (“POSIX.1”).
The behavior when a shared object is unloaded is an extension to that standard.
|May 15, 2015||OpenBSD-current|