PTHREAD_SIGMASK(3)

Linux Programmer's Manual

NAME

pthread_sigmask - examine and change mask of blocked signals

The pthread_sigmask() function is just like sigprocmask(2), with the difference that its use in multithreaded programs is explicitly specified by POSIX.1-2001. Other differences are noted in this page.

For a description of the arguments and operation of this function, see sigprocmask(2).

RETURN VALUE

On success, pthread_sigmask() returns 0; on error, it returns an error number.

ERRORS

See sigprocmask(2).

CONFORMING TO

POSIX.1-2001.

NOTES

A new thread inherits a copy of its creator's signal mask.

EXAMPLE

The program below blocks some signals in the main thread, and then creates a dedicated thread to fetch those signals via sigwait(3). The following shell session demonstrates its use:

$ ./a.out &
[1] 5423
$ kill -QUIT %1
Signal handling thread got signal 3
$ kill -USR1 %1
Signal handling thread got signal 10
$ kill -TERM %1
[1]+  Terminated              ./a.out

Program source

#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) \

        do { errno = en; perror(msg); exit(EXIT_FAILURE); } while (0)
static void *
sig_thread(void *arg)
{

    sigset_t *set = (sigset_t *) arg;

    int s, sig;

    for (;;) {

        s = sigwait(set, &sig);

        if (s != 0)

            handle_error_en(s, "sigwait");

        printf("Signal handling thread got signal %d\n", sig);

    }
}
int
main(int argc, char *argv[])
{

    pthread_t thread;

    sigset_t set;

    int s;

    /* Block SIGINT; 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, (void *) &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 */
}

COLOPHON

This page is part of release 3.32 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.

2009-01-25

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