sigdelset man page on Ultrix

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sigsetops(3)							  sigsetops(3)

Name
       sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - manipulate
       signal sets (POSIX)

Syntax
       #include <signal.h>

       int sigemptyset(set)
       sigset_t *set;

       int sigfillset (set)
       sigset_t *set;

       int sigaddset(set,sig)
       sigset_t *set;
       int sig;

       int sigdelset(set,sig)
       sigset_t *set;
       int sig;

       int sigismember(set,sig)
       sigset_t *set;
       int sig;

Description
       The functions manipulate signal sets used by  the  other	 POSIX	signal
       functions

       The  function initializes the signal set pointed to by the argument set
       so that all signals are excluded.

       The function initializes the signal set pointed to by the argument  set
       so that all signals are included.

       The  and	 functions  respectively  add and delete the individual signal
       specified by the value of the argument sig from the signal set  pointed
       to by the argument set.

       The  function  tests  whether  the signal specified by the value of the
       argument sig is a member of the set pointed to by the argument set.

Return Values
       Upon successful completion, the function returns a value of  1  if  the
       specified  signal is a member of the set.  If it is not a member of the
       set, a value of 0 is returned.

       If the or functions fail a -1 value is returned and  errno  is  set  to
       indicate the reason.

Diagnostics
       The function will fail and the signal mask will remain unchanged if one
       of the following occur:

       [EINVAL]	      The value of the sig argument is not a valid signal num‐
		      ber

See Also
       sigprocmask(3), sigaction(3), sigsuspend(3), sigpending(2)

								  sigsetops(3)
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