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
)
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 signal set.
sigemptyset()
and
sigfillset(
)
are provided as macros, but actual functions are available
if their names are undefined (with #undef
name).
)
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.
EINVAL
]
signo
has an invalid value.