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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

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, POSIX.1-2008.

NOTES

   sigwait() is implemented using sigtimedwait(2).

   The glibc implementation of sigwait() silently ignores attempts to wait
   for the two real-time signals that are  used  internally  by  the  NPTL
   threading implementation.  See nptl(7) for details.

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 4.09 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
   https://www.kernel.org/doc/man-pages/.



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