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int sigprocmask(int how, const sigset_t *set, sigset_t
*oset);
how: [in] what to do whit the signal set.
set: [in] the signal set.
oset: [out] the previous signal mask.
Modifies the signal mask. The parameter how can take one of the following values:
SIG_BLOCK
mask |= set. Adds new signals to the set of blocked
signals.
SIG_UNBLOCK
mask &= ~set. Removes the signals from he set of blocked
signals.
SIG_SETMASK
mask = set. set becomes the new signal mask.
On success, returns zero. On error, returns -1 and sets errno to
one of the following values:
EINVAL: how has an invalid value.
EFAULT.
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