linux man page for sigwait

SIGWAIT(3)						     Linux Programmer's Manual							SIGWAIT(3)

NAME
       sigwait - wait for a signal

SYNOPSIS
       #include <signal.h>

	int sigwait(const sigset_t *set, int *sig);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       sigwait(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE

DESCRIPTION
       The  sigwait()  function suspends execution of the calling thread until one of the signals specified in the signal set set becomes pending.
       The function accepts the signal (removes it from the pending list of signals), and returns the signal number in sig.

       The operation of sigwait() is the same as sigwaitinfo(2), except that:

       * sigwait() returns only the signal number, rather than a siginfo_t structure describing the signal.

       * The return values of the two functions are different.

RETURN VALUE
       On success, sigwait() returns 0.  On error, it returns a positive error number (listed in ERRORS).

ERRORS
       EINVAL set contains an invalid signal number.

ATTRIBUTES
       For an explanation of the terms used in this section, see attributes(7).

       +----------+---------------+---------+
       |Interface | Attribute	  | Value   |
       +----------+---------------+---------+
       |sigwait() | Thread safety | MT-Safe |
       +----------+---------------+---------+
CONFORMING TO
       POSIX.1-2001.

NOTES
       sigwait() is implemented using sigtimedwait(2).

EXAMPLE
       See pthread_sigmask(3).

SEE ALSO
       sigaction(2), signalfd(2), sigpending(2), sigsuspend(2), sigwaitinfo(2), sigsetops(3), signal(7)

Linux								    2015-03-02								SIGWAIT(3)