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sigsetops(3) [ultrix man page]

sigsetops(3)						     Library Functions Manual						      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 number

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

																      sigsetops(3)

Check Out this Related Man Page

SIGSET(3)						     Library Functions Manual							 SIGSET(3)

NAME

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

SYNOPSIS

       #include <signal.h>

       int sigaddset(sigset_t *set, int sig)
       int sigdelset(sigset_t *set, int sig)
       int sigemptyset(sigset_t *set)
       int sigfillset(sigset_t *set)
       int sigismember(const sigset_t *set, int sig)

DESCRIPTION

       The  system calls that handle signals, such as sigaction(2) and sigprocmask(2) use sets of signals to keep a process from being interrupted
       by those signals while executing a signal handler or a critical code segment.  These signal sets are manipulated  by  the  following  func-
       tions:

       int sigaddset(sigset_t *set, int sig)
	    Add signal sig to the signal set referenced by set.

       int sigdelset(sigset_t *set, int sig)
	    Remove signal sig from the signal set referenced by set.

       int sigemptyset(sigset_t *set)
	    Initialize the signal set referenced by set to an empty set.

       int sigfillset(sigset_t *set)
	    Initialize the signal set referenced by set to an full set, i.e. all signals are in the set.

       int sigismember(const sigset_t *set, int sig)
	    Return 1 if the signal sig is present in the set referenced by set, 0 otherwise.

SEE ALSO

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

DIAGNOSTICS

       All functions except sigismember return 0 on success.  Sigismember returns 0 or 1 on success.  They return -1 with error code EINVAL for an
       invalid signal number.  (They do not use EFAULT for a bad set address, but will simply cause a segmentation violation.)

AUTHOR

       Kees J. Bot (kjb@cs.vu.nl)

																	 SIGSET(3)
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