A/UX® Programmer's Reference Sections

sigsetops(3P) sigsetops(3P)
sigfillset initializes the signal set pointed to by set so that all
POSIX-defined signals are included.
sigemptyset initializes the signal set pointed to by set so that
all the POSIX-defined signals are excluded. Applications must
call sigemptyset for each object of type sigset_t before
any other use of the object
sigismember tests whether the signal specified by signo is a
member of the set pointed to by set.
RETURN VALUE
On successful completion, sigismember returns 1 if the
specified signal is a member of the specified set and returns 0 if it
is not On successful completion, each of the other functions returns
O. For all the functions listed, if an error is detected.
sigaddset, sigdelset, and sigismember returns -1 and
set errno to indicate the error.
ERRORS
If any of the following conditions occur, the function returns -1
and sets errno to the corresponding value:
[EINVAL] The value of signo is not a valid signal
number.
[EFAULT] set is an invalid address.
SEE ALSO
sigaction(3P), sigpending(3P). sigprocmask(2P).
sigsuspend(3P).
2
February, 1990
RevisionC