Man Sigaddset en anglais
SIGSETOPS(3)               Linux Programmer's Manual              SIGSETOPS(3)



 

NAME


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

 

SYNOPSIS


       #include 

       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);

 

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
       sigdelset()).  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.

 

ERRORS


       EINVAL sig is not a valid signal.

 

CONFORMING TO


       POSIX.1-2001.

 

NOTES


   Glibc Notes
       If the _GNU_SOURCE feature  test  macro  is  defined,  then  
       exposes three other functions for manipulating signal sets.

       int sigisemptyset(sigset_t *set);
              returns 1 if set contains no signals, and 0 otherwise.

       int sigorset(sigset_t *dest, sigset_t *left, sigset_t *right);
              places the union of the sets left and right in dest.

       int sigandset(sigset_t *dest, sigset_t *left, sigset_t *right);
              places the intersection of the sets left and right in dest.

       sigorset() and sigandset() return 0 on success, and -1 on failure.

       These  functions  are non-standard (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 3.05 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/.



Linux                             2007-11-25                      SIGSETOPS(3)