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man:sigsetops

SIGSETOPS(3) Linux Programmer's Manual SIGSETOPS(3)

NAME

     sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - POSIX sig-
     nal set operations

SYNOPSIS

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

DESCRIPTION

     These functions allow the manipulation of POSIX signal sets.
     sigemptyset() initializes the signal set given by set  to  empty,  with
     all signals excluded from the set.
     sigfillset() initializes set to full, including all signals.
     sigaddset()  and  sigdelset() add and delete respectively signal signum
     from set.
     sigismember() tests whether signum is a member of set.
     Objects of type sigset_t must  be  initialized  by  a  call  to  either
     sigemptyset()  or  sigfillset()  before  being  passed to the functions
     sigaddset(), sigdelset() and  sigismember()  or  the  additional  glibc
     functions  described  below  (sigisemptyset(),  sigandset(),  and  sig-
     orset()).  The results are undefined if this is not done.

RETURN VALUE

     sigemptyset(), sigfillset(), sigaddset(), and sigdelset() return  0  on
     success and -1 on error.
     sigismember()  returns  1  if signum is a member of set, 0 if signum is
     not a member, and -1 on error.
     On error, these functions set errno to indicate the cause of the error.

ERRORS

     EINVAL signum is not a valid signal.

ATTRIBUTES

     For   an   explanation   of   the  terms  used  in  this  section,  see
     attributes(7).
     +--------------------------------+---------------+---------+
     |Interface                       | Attribute     | Value   |
     +--------------------------------+---------------+---------+
     |sigemptyset(), sigfillset(),    | Thread safety | MT-Safe |
     |sigaddset(), sigdelset(),       |               |         |
     |sigismember(), sigisemptyset(), |               |         |
     |sigorset(), sigandset()         |               |         |
     +--------------------------------+---------------+---------+

CONFORMING TO

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

NOTES

     When creating a filled signal set, the glibc sigfillset() function does
     not include the two real-time  signals  used  internally  by  the  NPTL
     threading implementation.  See nptl(7) for details.
 Glibc extensions
     If  the  _GNU_SOURCE  feature  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 if set contains no signals, and 0  otherwise.
     sigorset()  places  the  union  of  the  sets  left  and right in dest.
     sigandset() places the intersection of the sets left and right in dest.
     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.

SEE ALSO

     sigaction(2), sigpending(2), sigprocmask(2), sigsuspend(2)

COLOPHON

     This page is part of release 4.16 of the Linux  man-pages  project.   A
     description  of  the project, information about reporting bugs, and the
     latest    version    of    this    page,    can     be     found     at
     https://www.kernel.org/doc/man-pages/.

Linux 2016-03-15 SIGSETOPS(3)

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