SIGSETMASK(3) BSD Programmer's Manual SIGSETMASK(3)
sigsetmask - set current signal mask
#include <signal.h> int sigsetmask(int mask); sigmask(int signum);
This interface is made obsoleted by: sigprocmask(2). sigsetmask() sets the current signal mask. Signals are blocked from delivery if the corresponding bit in mask is a 1; the macro sigmask() is provided to construct the mask for a given signum. The system quietly disallows SIGKILL or SIGSTOP to be blocked.
The previous set of masked signals is returned.
The following example utilizing 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: (void) sigsetmask(0); Which can be expressed via sigprocmask(2) as: sigset_t eset; sigemptyset(&eset); (void) sigprocmask(SIG_SETMASK, &eset, NULL);
kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigblock(3), sigsetops(3), sigvec(3)
The sigsetmask() function call appeared in 4.2BSD and has been deprecat- ed. MirBSD #10-current March 10, 1991 1