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PTHREAD_SIGMASK
Section: Linux Programmer's Manual (3)
Updated: 2009-01-25
Index
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NAME
pthread_sigmask - examine and change mask of blocked signals
SYNOPSIS
#include <signal.h>
int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset);
Compile and link with -pthread.
DESCRIPTION
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 */
}
SEE ALSO
sigaction(2),
sigpending(2),
sigprocmask(2)
pthread_create(3),
pthread_kill(3),
sigsetops(3),
pthreads(7),
signal(7)
COLOPHON
This page is part of release 3.27 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- CONFORMING TO
-
- NOTES
-
- EXAMPLE
-
- Program source
-
- SEE ALSO
-
- COLOPHON
-
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