int
sigblock(
int mask
)
int
sigmask(
signum
)
sigblock()
adds the signals specified in
mask
to the set of signals currently
being blocked from delivery.
Signals are blocked if the
corresponding bit in
mask
is a 1; the macro
sigmask()
is provided to construct the mask for a given
signum
.
It is not possible to block
SIGKILL
or
SIGSTOP
;
this restriction is silently
imposed by the system.
):
int omask;
omask = sigblock(sigmask(SIGINT) | sigmask(SIGHUP));
Becomes:
sigset_t set, oset;
sigemptyset(&set);
sigaddset(&set, SIGINT);
sigaddset(&set, SIGHUP);
sigprocmask(SIG_BLOCK, &set, &oset);
Another use of
sigblock()
is to get the current set of masked signals without changing what
is actually blocked.
Instead of:
int set;
set = sigblock(0);
Use the following:
sigset_t set;
sigprocmask(SIG_BLOCK, NULL, &set);
)
function call appeared in
4.2BSD
and has been deprecated.