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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 2024-05-02 "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)