SIGBLOCK(3) BSD Programmer's Manual SIGBLOCK(3)
sigblock - block signals
#include <signal.h> int sigblock(int mask); int sigmask(int signum);
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 con- struct the mask for a given signum. It is not possible to block SIGKILL or SIGSTOP; this restriction is silently imposed by the system.
The previous set of masked signals is returned.
The following example utilizing 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);
kill(2), sigaction(2), sigprocmask(2), sigsetmask(3), sigsetops(3)
The sigblock() function call appeared in 4.2BSD and has been deprecated. MirOS BSD #10-current March 10, 1991 1
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