COHERENT manpages
This page displays the COHERENT manpage for sigprocmask() [Examine or change the signal mask].
List of available manpages
Index
sigprocmask() -- System Call (libc) Examine or change the signal mask #include <signal.h> int sigprocmask(how, set, old_set) int how; const sigset_t *set; sigset_t *old_set; sigprocmask() examines or changes the calling process's signal mask. how defines how to modify the mask, as follows: SIG_BLOCK Add to the signal mask the set of signals to which set points. SIG_UNBLOCK Remove from the signal mask the set of signals to which set points. SIG_SETMASK Replace the current signal mask with the set of signals to which set points. If old_set is not NULL, sigprocmask() stores the old mask in the space to which it points. If set is NULL, sigprocmask() ignores the value of how; thus, you can use the call to find which signals are in the signal mask. If any unblocked unblocked signals are pending after you call sigprocmask(), at least one of those signals will be delivered before sigprocmask() returns. If all goes well, sigprocmask() returns zero. sigprocmask() returns -1 if either of the following conditions is true: -> how is not set to a recognized value. sigprocmask() sets errno to EINVAL. -> set or old_set points outside the process's allocated address space. sigprocmask() sets errno to EFAULT. In either error condition, sigprocmask() does not change the signal mask. See Also libc, signal(), siglongjmp(), sigsetjmp() POSIX Standard, §3.3.5