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
   Multithreading (see pthreads(7))
       The sigwait() function is thread-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)

COLOPHON
       This page is part of release 3.74 of the Linux man-pages project.  A  description  of  the
       project,  information  about  reporting  bugs, and the latest version of this page, can be
       found at http://www.kernel.org/doc/man-pages/.



Linux                                       2013-12-16                                 SIGWAIT(3)