Movatterモバイル変換

sigsetops(3) — Linux manual page

NAME \|LIBRARY \|SYNOPSIS \|DESCRIPTION \|RETURN VALUE \|ERRORS \|ATTRIBUTES \|VERSIONS \|STANDARDS \|HISTORY \|NOTES \|SEE ALSO \|COLOPHON

SIGSETOPS(3)             Library Functions ManualSIGSETOPS(3)

NAME top

       sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - POSIX       signal set operations

LIBRARY top

       Standard C library (libc,-lc)

SYNOPSIS top

#include <signal.h>int sigemptyset(sigset_t *set);int sigfillset(sigset_t *set);int sigaddset(sigset_t *set, intsignum);int sigdelset(sigset_t *set, intsignum);int sigismember(const sigset_t *set, intsignum);   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):sigemptyset(),sigfillset(),sigaddset(),sigdelset(),sigismember():           _POSIX_C_SOURCE

DESCRIPTION top

       These functions allow the manipulation of POSIX signal sets.sigemptyset() initializes the signal set given byset to empty,       with all signals excluded from the set.sigfillset() initializesset to full, including all signals.sigaddset() andsigdelset() add and delete respectively signalsignum fromset.sigismember() tests whethersignum is a member ofset.       Objects of typesigset_t must be initialized by a call to eithersigemptyset() orsigfillset() before being passed to the functionssigaddset(),sigdelset(), andsigismember() or the additional       glibc functions described below (sigisemptyset(),sigandset(), andsigorset()).  The results are undefined if this is not done.

RETURN VALUE top

sigemptyset(),sigfillset(),sigaddset(), andsigdelset() return 0       on success and -1 on error.sigismember() returns 1 ifsignum is a member ofset, 0 ifsignum       is not a member, and -1 on error.       On error, these functions seterrno to indicate the error.

ERRORS top

EINVALsignum is not a valid signal.

ATTRIBUTES top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │sigemptyset(),sigfillset(),         │ Thread safety │ MT-Safe │       │sigaddset(),sigdelset(),            │               │         │       │sigismember(),sigisemptyset(),      │               │         │       │sigorset(),sigandset()              │               │         │       └──────────────────────────────────────┴───────────────┴─────────┘

VERSIONS top

GNU       If the_GNU_SOURCEfeature test macro is defined, then<signal.h>       exposes three other functions for manipulating signal sets:int sigisemptyset(const sigset_t *set);int sigorset(sigset_t *dest, const sigset_t *left,const sigset_t *right);int sigandset(sigset_t *dest, const sigset_t *left,const sigset_t *right);sigisemptyset() returns 1 ifset contains no signals, and 0       otherwise.sigorset() places the union of the setsleft andright indest.sigandset() places the intersection of the setsleft andright indest.  Both functions return 0 on success, and -1 on failure.       These functions are nonstandard (a few other systems provide       similar functions) and their use should be avoided in portable       applications.

STANDARDS top

       POSIX.1-2008.

HISTORY top

       POSIX.1-2001.

NOTES top

       When creating a filled signal set, the glibcsigfillset() function       does not include the two real-time signals used internally by the       NPTL threading implementation.  Seenptl(7) for details.

COLOPHON top

       This page is part of theman-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 isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17SIGSETOPS(3)

Pages that refer to this page:sigaction(2), signal(2), signalfd(2), sigpending(2), sigprocmask(2), sigsuspend(2), sigwaitinfo(2), pthread_attr_setsigmask_np(3), pthread_sigmask(3), sigwait(3), nptl(7), signal(7), signal-safety(7)