Copyright © tutorialspoint.com
int sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
Tag | Description |
---|---|
SIG_BLOCK | |
The set of blocked signals is the union of the current set and the set argument. | |
SIG_UNBLOCK | |
The signals in set are removed from the current set of blocked signals. It is legal to attempt to unblock a signal which is not blocked. | |
SIG_SETMASK | |
The set of blocked signals is set to the argument set. |
If oldset is non-null, the previous value of the signal mask is stored in oldset.
If set is NULL, then the signal mask is unchanged (i.e., how is ignored), but the current value of the signal mask is nevertheless returned in oldset (it is not NULL).
The use of sigprocmask() is unspecified in a multithreaded process; see pthread_sigmask(3).
If SIGBUS, SIGFPE, SIGILL, or SIGSEGV are generated while they are blocked, the result is undefined, unless the signal was generated by the kill(2), sigqueue(2), or raise(3).
See sigsetops(3) for details on manipulating signal sets.
Copyright © tutorialspoint.com