SIGPROCMASK(2) | NetBSD System Calls Manual | SIGPROCMASK(2) |
int
sigprocmask(int how, const sigset_t * restrict set, sigset_t * restrict oset);
If set is not null, the action of sigprocmask() depends on the value of the parameter how. The signal mask is changed as a function of the specified set and the current mask. The function is specified by how using one of the following values:
If oset is not null, it is set to the previous value of the signal mask.
When set is null, the value of how is insignificant and the mask remains unset providing a way to examine the signal mask without modification.
The system quietly disallows SIGKILL or SIGSTOP to be blocked.
June 4, 1993 | NetBSD 5.99 |