The following example using
sigsetmask():
int omask;
omask = sigblock(sigmask(SIGINT) | sigmask(SIGHUP));
...
sigsetmask(omask & ~(sigmask(SIGINT) | sigmask(SIGHUP)));
Could be converted literally to:
sigset_t set, oset;
sigemptyset(&set);
sigaddset(&set, SIGINT);
sigaddset(&set, SIGHUP);
sigprocmask(SIG_BLOCK, &set, &oset);
...
sigdelset(&oset, SIGINT);
sigdelset(&oset, SIGHUP);
sigprocmask(SIG_SETMASK, &oset, NULL);
Another, clearer, alternative is:
sigset_t set;
sigemptyset(&set);
sigaddset(&set, SIGINT);
sigaddset(&set, SIGHUP);
sigprocmask(SIG_BLOCK, &set, NULL);
...
sigprocmask(SIG_UNBLOCK, &set, NULL);
To completely clear the signal mask using
sigsetmask() one can do:
Which can be expressed via
sigprocmask(2) as:
sigset_t eset;
sigemptyset(&eset);
(void) sigprocmask(SIG_SETMASK, &eset, NULL);