string_copying.7: Document strndup(3)

[thirdparty/man-pages.git] / man3 / pthread_sigmask.3

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-.\" Copyright (c) 2009 Linux Foundation, written by Michael Kerrisk
-.\"     <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH PTHREAD_SIGMASK 3 2021-03-22 "Linux man-pages (unreleased)"
-.SH NAME
-pthread_sigmask \- examine and change mask of blocked signals
-.SH LIBRARY
-POSIX threads library
-.RI ( libpthread ", " \-lpthread )
-.SH SYNOPSIS
-.nf
-.B #include <signal.h>
-.PP
-.BI "int pthread_sigmask(int " how ", const sigset_t *" set \
-", sigset_t *" oldset );
-.fi
-.PP
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.PP
-.BR pthread_sigmask ():
-.nf
-    _POSIX_C_SOURCE >= 199506L || _XOPEN_SOURCE >= 500
-.fi
-.SH DESCRIPTION
-The
-.BR pthread_sigmask ()
-function is just like
-.BR sigprocmask (2),
-with the difference that its use in multithreaded programs
-is explicitly specified by POSIX.1.
-Other differences are noted in this page.
-.PP
-For a description of the arguments and operation of this function, see
-.BR sigprocmask (2).
-.SH RETURN VALUE
-On success,
-.BR pthread_sigmask ()
-returns 0;
-on error, it returns an error number.
-.SH ERRORS
-See
-.BR sigprocmask (2).
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface      Attribute       Value
-T{
-.BR pthread_sigmask ()
-T}     Thread safety   MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH STANDARDS
-POSIX.1-2001, POSIX.1-2008.
-.SH NOTES
-A new thread inherits a copy of its creator's signal mask.
-.PP
-The glibc
-.BR pthread_sigmask ()
-function silently ignores attempts to block the two real-time signals that
-are used internally by the NPTL threading implementation.
-See
-.BR nptl (7)
-for details.
-.SH EXAMPLES
-The program below blocks some signals in the main thread,
-and then creates a dedicated thread to fetch those signals via
-.BR sigwait (3).
-The following shell session demonstrates its use:
-.PP
-.in +4n
-.EX
-.RB "$" " ./a.out &"
-[1] 5423
-.RB "$" " kill \-QUIT %1"
-Signal handling thread got signal 3
-.RB "$" " kill \-USR1 %1"
-Signal handling thread got signal 10
-.RB "$" " kill \-TERM %1"
-[1]+  Terminated              ./a.out
-.EE
-.in
-.SS Program source
-\&
-.\" SRC BEGIN (pthread_sigmask.c)
-.EX
-#include <pthread.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <signal.h>
-#include <errno.h>
-
-/* Simple error handling functions */
-
-#define handle_error_en(en, msg) \e
-        do { errno = en; perror(msg); exit(EXIT_FAILURE); } while (0)
-
-static void *
-sig_thread(void *arg)
-{
-    sigset_t *set = arg;
-    int s, sig;
-
-    for (;;) {
-        s = sigwait(set, &sig);
-        if (s != 0)
-            handle_error_en(s, "sigwait");
-        printf("Signal handling thread got signal %d\en", sig);
-    }
-}
-
-int
-main(int argc, char *argv[])
-{
-    pthread_t thread;
-    sigset_t set;
-    int s;
-
-    /* Block SIGQUIT and SIGUSR1; other threads created by main()
-       will inherit a copy of the signal mask. */
-
-    sigemptyset(&set);
-    sigaddset(&set, SIGQUIT);
-    sigaddset(&set, SIGUSR1);
-    s = pthread_sigmask(SIG_BLOCK, &set, NULL);
-    if (s != 0)
-        handle_error_en(s, "pthread_sigmask");
-
-    s = pthread_create(&thread, NULL, &sig_thread, &set);
-    if (s != 0)
-        handle_error_en(s, "pthread_create");
-
-    /* Main thread carries on to create other threads and/or do
-       other work. */
-
-    pause();            /* Dummy pause so we can test program */
-}
-.EE
-.\" SRC END
-.SH SEE ALSO
-.BR sigaction (2),
-.BR sigpending (2),
-.BR sigprocmask (2),
-.BR pthread_attr_setsigmask_np (3),
-.BR pthread_create (3),
-.BR pthread_kill (3),
-.BR sigsetops (3),
-.BR pthreads (7),
-.BR signal (7)