NAME    [Toc]    [Back]

     sigemptyset, sigfillset, sigaddset, sigdelset, sigismember -
manipulate
     signal sets

SYNOPSIS    [Toc]    [Back]

     #include <signal.h>

     int
     sigemptyset(sigset_t *set);

     int
     sigfillset(sigset_t *set);

     int
     sigaddset(sigset_t *set, int signo);

     int
     sigdelset(sigset_t *set, int signo);

     int
     sigismember(sigset_t *set, int signo);

DESCRIPTION    [Toc]    [Back]

     These functions manipulate signal sets stored in a sigset_t.
Either
     sigemptyset() or sigfillset() must be called for  every  object of type
     sigset_t  before any other use of the object.  sigemptyset()
and
     sigfillset() are provided as macros,  but  actual  functions
are available
     if their names are undefined (with #undef name).

     The  sigemptyset()  function  initializes a signal set to be
empty.

     sigfillset() initializes a signal set to  contain  all  signals.

     sigaddset()  adds  the  specified signal signo to the signal
set.

     sigdelset() deletes the specified signal signo from the signal set.

     sigismember()  returns  whether  a specified signal signo is
contained in
     the signal set.

RETURN VALUES    [Toc]    [Back]

     The sigismember() function returns 1 if the signal is a member of the
     set,  a 0 otherwise.  The other functions return 0 upon success.  A -1 return
 value indicates an error occurred and the global  variable errno is
     set to indicate the reason.

ERRORS    [Toc]    [Back]

     These functions may fail if one of the following occurs:

     [EINVAL]      The specified signal signo is not a valid signal number.

SEE ALSO    [Toc]    [Back]

     kill(2), sigaction(2), sigsuspend(2)

STANDARDS    [Toc]    [Back]

     These  functions  are  defined  by  IEEE   Std   1003.1-1990
(``POSIX'').

OpenBSD      3.6                           June      4,      1993