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-.\" Copyright (c) 2005 Michael Kerrisk
-.\" based on earlier work by faith@cs.unc.edu and
-.\" Mike Battersby <mib@deakin.edu.au>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" 2005-09-15, mtk, Created new page by splitting off from sigaction.2
-.\"
-.TH sigsuspend 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-sigsuspend, rt_sigsuspend \- wait for a signal
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <signal.h>
-.P
-.BI "int sigsuspend(const sigset_t *" mask );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR sigsuspend ():
-.nf
-    _POSIX_C_SOURCE
-.fi
-.SH DESCRIPTION
-.BR sigsuspend ()
-temporarily replaces the signal mask of the calling thread with the
-mask given by
-.I mask
-and then suspends the thread until delivery of a signal whose
-action is to invoke a signal handler or to terminate a process.
-.P
-If the signal terminates the process, then
-.BR sigsuspend ()
-does not return.
-If the signal is caught, then
-.BR sigsuspend ()
-returns after the signal handler returns,
-and the signal mask is restored to the state before the call to
-.BR sigsuspend ().
-.P
-It is not possible to block
-.B SIGKILL
-or
-.BR SIGSTOP ;
-specifying these signals in
-.IR mask ,
-has no effect on the thread's signal mask.
-.SH RETURN VALUE
-.BR sigsuspend ()
-always returns \-1, with
-.I errno
-set to indicate the error (normally,
-.BR EINTR ).
-.SH ERRORS
-.TP
-.B EFAULT
-.I mask
-points to memory which is not a valid part of the process address space.
-.TP
-.B EINTR
-The call was interrupted by a signal;
-.BR signal (7).
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.SS C library/kernel differences
-The original Linux system call was named
-.BR sigsuspend ().
-However, with the addition of real-time signals in Linux 2.2,
-the fixed-size, 32-bit
-.I sigset_t
-type supported by that system call was no longer fit for purpose.
-Consequently, a new system call,
-.BR rt_sigsuspend (),
-was added to support an enlarged
-.I sigset_t
-type.
-The new system call takes a second argument,
-.IR "size_t sigsetsize" ,
-which specifies the size in bytes of the signal set in
-.IR mask .
-This argument is currently required to have the value
-.I sizeof(sigset_t)
-(or the error
-.B EINVAL
-results).
-The glibc
-.BR sigsuspend ()
-wrapper function hides these details from us, transparently calling
-.BR rt_sigsuspend ()
-when the kernel provides it.
-.\"
-.SH NOTES
-Normally,
-.BR sigsuspend ()
-is used in conjunction with
-.BR sigprocmask (2)
-in order to prevent delivery of a signal during the execution of a
-critical code section.
-The caller first blocks the signals with
-.BR sigprocmask (2).
-When the critical code has completed, the caller then waits for the
-signals by calling
-.BR sigsuspend ()
-with the signal mask that was returned by
-.BR sigprocmask (2)
-(in the
-.I oldset
-argument).
-.P
-See
-.BR sigsetops (3)
-for details on manipulating signal sets.
-.SH SEE ALSO
-.BR kill (2),
-.BR pause (2),
-.BR sigaction (2),
-.BR signal (2),
-.BR sigprocmask (2),
-.BR sigwaitinfo (2),
-.BR sigsetops (3),
-.BR sigwait (3),
-.BR signal (7)