Copyright (c) 1983 The Regents of the University of California.
All rights reserved.

%sccs.include.redist.man%

@(#)sigsetops.3 6.1 (Berkeley) 07/01/90

C 7 sigsetops, sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - manipulate signal masks

 #include <signal.h> 
 sigemptyset(set);  sigset_t *set; 
 sigfillset(set);  sigset_t *set; 
 sigaddset(set, signo);  sigset_t *set;  int signo; 
 sigdelset(set, signo);  sigset_t *set;  int signo; 
 sigismember(set, signo);  sigset_t *set;  int signo; 
 DESCRIPTION
These functions manipulate signal mask stored in a
 sigset_t . They 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.
The
 sigfillset function initializes a signal set to contain all of the known signals.
One of these routines must be used to initialize a signal set
before its use by the other functions.

The
 sigaddset function adds a specified signal
 signo to a signal set.
The
 sigdelset function deletes a specified signal
 signo from a signal set.

The
 sigismember function tests whether a specified signal
 signo is contained in a signal set.
 "RETURN VALUE
The
 sigismember function returnes 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
 errno is set to indicated the reason.
The current implementation does not detect any errors.
 ERRORS
These functions could fail if one of the following occurs:
 15
[EINVAL]
 signo has an invalid value.
 STANDARDS
These functions are defined by POSIX.1.
 "SEE ALSO"
kill(2), sigaction(2), sigsetops(2), sigsuspend(2)