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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():
         Since glibc 2.26:
             _POSIX_C_SOURCE >= 199506L
         Glibc 2.25 and earlier:
             _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),  sigwait-
     info(2), sigsetops(3), signal(7)

COLOPHON

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     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/.

Linux 2017-07-13 SIGWAIT(3)