SIGSETOPS(3C) Standard C Library Functions SIGSETOPS(3C)
NAME
sigsetops, sigemptyset, sigfillset, sigaddset, sigdelset, sigismember -
manipulate sets of signals
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
sigset_t data types, representing the set of
signals supported by the implementation.
The
sigemptyset() function initializes the set pointed to by
set to
exclude all signals defined by the system.
The
sigfillset() function initializes the set pointed to by
set to
include all signals defined by the system.
The
sigaddset() function adds the individual signal specified by the
value of
signo to the set pointed to by
set.
The
sigdelset() function deletes the individual signal specified by the
value of
signo from the set pointed to by
set.
The
sigismember() function checks whether the signal specified by the
value of
signo is a member of the set pointed to by
set.
Any object of type
sigset_t must be initialized by applying either
sigemptyset() or
sigfillset() before applying any other operation.
RETURN VALUES
Upon successful completion, the
sigismember() function returns
1 if the
specified signal is a member of the specified set, or
0 if it is not.
Upon successful completion, the other functions return
0. Otherwise
-1 is
returned and
errno is set to indicate the error.
ERRORS
The
sigaddset(),
sigdelset(), and
sigismember() functions will fail if:
EINVAL The value of the
signo argument is not a valid signal number.
The
sigfillset() function will fail if:
EFAULT The
set argument specifies an invalid address.
ATTRIBUTES
See
attributes(7) for descriptions of the following attributes:
+--------------------+-------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-------------------+
|Interface Stability | Standard |
+--------------------+-------------------+
|MT-Level | Async-Signal-Safe |
+--------------------+-------------------+
SEE ALSO
sigaction(2),
sigpending(2),
sigprocmask(2),
sigsuspend(2),
signal.h(3HEAD),
attributes(7),
standards(7) December 19, 2003
SIGSETOPS(3C)