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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>
+.P
+.BI "int sigwait(const sigset_t *restrict " set ", int *restrict " sig );
+.fi
+.P
+.RS -4
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.RE
+.P
+.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.
+For a signal to become pending,
+it must first be blocked with
+.BR sigprocmask (2).
+The function accepts the signal
+(removes it from the pending list of signals),
+and returns the signal number in
+.IR sig .
+.P
+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).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR sigwait ()
+T}	Thread safety	MT-Safe
+.TE
+.SH VERSIONS
+.BR sigwait ()
+is implemented using
+.BR sigtimedwait (2);
+consult its
+.BR NOTES .
+.P
+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)