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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 pthread_attr_setsigmask_np 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-pthread_attr_setsigmask_np, pthread_attr_getsigmask_np \- set/get
-signal mask attribute in thread attributes object
-.SH LIBRARY
-POSIX threads library
-.RI ( libpthread ", " \-lpthread )
-.SH SYNOPSIS
-.nf
-.BR "#define _GNU_SOURCE" "             /* See feature_test_macros(7) */"
-.B #include <pthread.h>
-.P
-.BI "int pthread_attr_setsigmask_np(pthread_attr_t *" attr ,
-.BI "                               const sigset_t *" sigmask );
-.BI "int pthread_attr_getsigmask_np(const pthread_attr_t *" attr ,
-.BI "                               sigset_t *" sigmask );
-.fi
-.SH DESCRIPTION
-The
-.BR pthread_attr_setsigmask_np ()
-function sets the signal mask attribute of the
-thread attributes object referred to by
-.I attr
-to the value specified in
-.IR *sigmask .
-If
-.I sigmask
-is specified as NULL, then any existing signal mask attribute in
-.I attr
-is unset.
-.P
-The
-.BR pthread_attr_getsigmask_np ()
-function returns the signal mask attribute of the thread attributes object
-referred to by
-.I attr
-in the buffer pointed to by
-.IR sigmask .
-If the signal mask attribute is currently unset,
-then this function returns the special value
-.B PTHREAD_ATTR_NO_SIGMASK_NP
-as its result.
-.SH RETURN VALUE
-The
-.BR pthread_attr_setsigmask_np ()
-function returns 0 on success, or a nonzero error number on failure.
-.P
-the
-.BR pthread_attr_getsigmask_np ()
-function returns either 0 or
-.BR PTHREAD_ATTR_NO_SIGMASK_NP .
-When 0 is returned, the signal mask attribute is returned via
-.IR sigmask .
-A return value of
-.B PTHREAD_ATTR_NO_SIGMASK_NP
-indicates that the signal mask attribute is not set in
-.IR attr .
-.P
-On error, these functions return a positive error number.
-.SH ERRORS
-.TP
-.B ENOMEM
-.RB ( pthread_attr_setsigmask_np ())
-Could not allocate memory.
-.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 pthread_attr_setsigmask_np (),
-.BR pthread_attr_getsigmask_np ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-GNU;
-hence the suffix "_np" (nonportable) in the names.
-.SH HISTORY
-glibc 2.32.
-.SH NOTES
-The signal mask attribute determines the signal mask that will be assigned to
-a thread created using the thread attributes object
-.IR attr .
-If this attribute is not set, then a thread created using
-.I attr
-will inherit a copy of the creating thread's signal mask.
-.P
-For more details on signal masks, see
-.BR sigprocmask (2).
-For a description of a set of macros
-that can be used to manipulate and inspect signal sets, see
-.BR sigsetops (3).
-.P
-In the absence of
-.BR pthread_attr_setsigmask_np ()
-it is possible to create a thread with a desired signal mask as follows:
-.IP \[bu] 3
-The creating thread uses
-.BR pthread_sigmask (3)
-to save its current signal mask and set its mask to block all signals.
-.IP \[bu]
-The new thread is then created using
-.BR pthread_create ();
-the new thread will inherit the creating thread's signal mask.
-.IP \[bu]
-The new thread sets its signal mask to the desired value using
-.BR pthread_sigmask (3).
-.IP \[bu]
-The creating thread restores its signal mask to the original value.
-.P
-Following the above steps,
-there is no possibility for the new thread to receive a signal
-before it has adjusted its signal mask to the desired value.
-.SH SEE ALSO
-.BR sigprocmask (2),
-.BR pthread_attr_init (3),
-.BR pthread_sigmask (3),
-.BR pthreads (7),
-.BR signal (7)