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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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pthread_a...igmask_np(3) Library Functions Manualpthread_a...igmask_np(3)
pthread_attr_setsigmask_np, pthread_attr_getsigmask_np - set/get
signal mask attribute in thread attributes object
POSIX threads library (libpthread, -lpthread)
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <pthread.h>
int pthread_attr_setsigmask_np(pthread_attr_t *attr,
const sigset_t *sigmask);
int pthread_attr_getsigmask_np(const pthread_attr_t *attr,
sigset_t *sigmask);
The pthread_attr_setsigmask_np() function sets the signal mask
attribute of the thread attributes object referred to by attr to
the value specified in *sigmask. If sigmask is specified as NULL,
then any existing signal mask attribute in attr is unset.
The pthread_attr_getsigmask_np() function returns the signal mask
attribute of the thread attributes object referred to by attr in
the buffer pointed to by sigmask. If the signal mask attribute is
currently unset, then this function returns the special value
PTHREAD_ATTR_NO_SIGMASK_NP as its result.
The pthread_attr_setsigmask_np() function returns 0 on success, or
a nonzero error number on failure.
the pthread_attr_getsigmask_np() function returns either 0 or
PTHREAD_ATTR_NO_SIGMASK_NP. When 0 is returned, the signal mask
attribute is returned via sigmask. A return value of
PTHREAD_ATTR_NO_SIGMASK_NP indicates that the signal mask
attribute is not set in attr.
On error, these functions return a positive error number.
ENOMEM (pthread_attr_setsigmask_np()) Could not allocate memory.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ pthread_attr_setsigmask_np(), │ Thread safety │ MT-Safe │
│ pthread_attr_getsigmask_np() │ │ │
└──────────────────────────────────────┴───────────────┴─────────┘
GNU; hence the suffix "_np" (nonportable) in the names.
glibc 2.32.
The signal mask attribute determines the signal mask that will be
assigned to a thread created using the thread attributes object
attr. If this attribute is not set, then a thread created using
attr will inherit a copy of the creating thread's signal mask.
For more details on signal masks, see sigprocmask(2). For a
description of a set of macros that can be used to manipulate and
inspect signal sets, see sigsetops(3).
In the absence of pthread_attr_setsigmask_np() it is possible to
create a thread with a desired signal mask as follows:
• The creating thread uses pthread_sigmask(3) to save its current
signal mask and set its mask to block all signals.
• The new thread is then created using pthread_create(); the new
thread will inherit the creating thread's signal mask.
• The new thread sets its signal mask to the desired value using
pthread_sigmask(3).
• The creating thread restores its signal mask to the original
value.
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.
sigprocmask(2), pthread_attr_init(3), pthread_sigmask(3),
pthreads(7), signal(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 pthread_a...igmask_np(3)
Pages that refer to this page: pthread_attr_init(3), pthread_sigmask(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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