SIGADDSET(3) | Library Functions Manual | SIGADDSET(3) |
sigemptyset
,
sigfillset
, sigaddset
,
sigdelset
, sigismember
— manipulate signal sets
#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
(const
sigset_t *set, int
signo);
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.
sigemptyset
() and
sigfillset
() 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.
sigfillset
()
initializes a signal set to contain all signals.
sigaddset
()
adds the specified signal signo to the signal set.
sigdelset
()
deletes the specified signal signo from the signal
set.
sigismember
()
returns whether a specified signal signo is contained
in the signal set.
The sigismember
() function returns 1 if
the signal is a member of the set and 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.
These functions may fail if one of the following occurs:
EINVAL
]kill(2), sigaction(2), sigpending(2), sigprocmask(2), sigsuspend(2)
These functions are defined by IEEE Std 1003.1-1990 (“POSIX.1”).
May 29, 2017 | OpenBSD-6.8 |