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NetBSD 6.1.5 - man page for sigaddset (netbsd section 3)

SIGSETOPS(3)			   BSD Library Functions Manual 		     SIGSETOPS(3)

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

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #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
     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.

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

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

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

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

     The sigismember() function returns whether a specified signal signo is contained in the sig-
     nal set.

     sigemptyset() and sigfillset() are provided as macros, but actual functions are available if
     their names are undefined (with #undef name).

RETURN VALUES
     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
     These functions could fail if one of the following occurs:

     [EINVAL]		signo has an invalid value.

SEE ALSO
     kill(2), sigaction(2), sigsuspend(2), signal(7)

STANDARDS
     These functions conform to ISO/IEC 9945-1:1990 (``POSIX.1'').

BSD					   June 4, 1993 				      BSD


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