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SIGBLOCK(3) Library Functions Manual SIGBLOCK(3) NAME sigblock - block signals LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <signal.h> int sigblock(int mask); int sigmask(signum); DESCRIPTION This interface is made obsolete by: sigprocmask(2). sigblock() adds the signals specified in mask to the set of signals currently being blocked from delivery. Signals are blocked if the corresponding bit in mask is a 1; the macro sigmask() is provided to construct the mask for a given signum. It is not possible to block SIGKILL or SIGSTOP; this restriction is silently imposed by the system. RETURN VALUES The previous set of masked signals is returned. EXAMPLES The following example using sigblock(): int omask; omask = sigblock(sigmask(SIGINT) | sigmask(SIGHUP)); Becomes: sigset_t set, oset; sigemptyset(&set); sigaddset(&set, SIGINT); sigaddset(&set, SIGHUP); sigprocmask(SIG_BLOCK, &set, &oset); Another use of sigblock() is to get the current set of masked signals without changing what is actually blocked. Instead of: int set; set = sigblock(0); Use the following: sigset_t set; sigprocmask(SIG_BLOCK, NULL, &set); SEE ALSO kill(2), sigaction(2), sigprocmask(2), sigsetmask(3), sigsetops(3) HISTORY The sigblock() function call appeared in 4.2BSD and has been deprecated. NetBSD 8.0 August 10, 2002 NetBSD 8.0