sigprocmask - manipulate the signal mask
int sigprocmask(int how, const sigset_t *set, sigset_t *oset)
Sigprocmask() examines or manipulates the signal mask. This mask is the
set of signals that are currently blocked. The how argument determines
the action that must be performed. In all cases the signal set
referenced by oset, if not NULL, will be used to receive the old signal
mask. The set argument, if not NULL, will be used to set or modify the
current signal mask.
How can be one of:
SIG_BLOCK Add the signals referenced by set to the mask.
SIG_UNBLOCK Remove the signals referenced by set from the mask.
SIG_SETMASK Set the signal mask to the set referenced by set.
The value of how is ignored if set is NULL.
sigaction(2), sigpending(2), sigsuspend(2), sigset(3).
Returns 0 on success and -1 on error. The error code is EFAULT for a bad
set or oset address, or EINVAL for a bad how argument.
Kees J. Bot (email@example.com)