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-'\" t
-.\" Copyright (c) 2008, Linux Foundation, written by Michael Kerrisk
-.\" <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH sigwait 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-sigwait \- wait for a signal
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <signal.h>
-.PP
-.BI "int sigwait(const sigset_t *restrict " set ", int *restrict " sig );
-.fi
-.PP
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.PP
-.BR sigwait ():
-.nf
- Since glibc 2.26:
- _POSIX_C_SOURCE >= 199506L
- glibc 2.25 and earlier:
- _POSIX_C_SOURCE
-.fi
-.SH DESCRIPTION
-The
-.BR sigwait ()
-function suspends execution of the calling thread until
-one of the signals specified in the signal set
-.I set
-becomes pending.
-The function accepts the signal
-(removes it from the pending list of signals),
-and returns the signal number in
-.IR sig .
-.PP
-The operation of
-.BR sigwait ()
-is the same as
-.BR sigwaitinfo (2),
-except that:
-.IP \[bu] 3
-.BR sigwait ()
-returns only the signal number, rather than a
-.I siginfo_t
-structure describing the signal.
-.IP \[bu]
-The return values of the two functions are different.
-.SH RETURN VALUE
-On success,
-.BR sigwait ()
-returns 0.
-On error, it returns a positive error number (listed in ERRORS).
-.SH ERRORS
-.TP
-.B EINVAL
-.\" Does not occur for glibc.
-.I set
-contains an invalid signal number.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.BR sigwait ()
-T} Thread safety MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH VERSIONS
-.BR sigwait ()
-is implemented using
-.BR sigtimedwait (2).
-.PP
-The glibc implementation of
-.BR sigwait ()
-silently ignores attempts to wait for the two real-time signals that
-are used internally by the NPTL threading implementation.
-See
-.BR nptl (7)
-for details.
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.SH EXAMPLES
-See
-.BR pthread_sigmask (3).
-.SH SEE ALSO
-.BR sigaction (2),
-.BR signalfd (2),
-.BR sigpending (2),
-.BR sigsuspend (2),
-.BR sigwaitinfo (2),
-.BR sigsetops (3),
-.BR signal (7)