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   pthread_sigmask    ( 3 )

проверить и изменить маску заблокированных сигналов (examine and change mask of blocked signals)

Имя (Name)

pthread_sigmask - examine and change mask of blocked signals

Синопсис (Synopsis)

#include <signal.h>

int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset);

Compile and link with -pthread.

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

pthread_sigmask(): _POSIX_C_SOURCE >= 199506L || _XOPEN_SOURCE >= 500


Описание (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.  Other differences are noted in
       this page.

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


Возвращаемое значение (Return value)

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

Ошибки (Error)

See sigprocmask(2).

Атрибуты (Attributes)

For an explanation of the terms used in this section, see
       attributes(7).

┌──────────────────────────────────────┬───────────────┬─────────┐ │Interface Attribute Value │ ├──────────────────────────────────────┼───────────────┼─────────┤ │pthread_sigmask() │ Thread safety │ MT-Safe │ └──────────────────────────────────────┴───────────────┴─────────┘


Стандарты (Conforming to)

POSIX.1-2001, POSIX.1-2008.

Примечание (Note)

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

The glibc pthread_sigmask() function silently ignores attempts to block the two real-time signals that are used internally by the NPTL threading implementation. See nptl(7) for details.


Примеры (Examples)

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 = 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 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 */ }


Смотри также (See also)

sigaction(2), sigpending(2), sigprocmask(2),
       pthread_attr_setsigmask_np(3), pthread_create(3),
       pthread_kill(3), sigsetops(3), pthreads(7), signal(7)