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SIGBLOCK(2) BSD System Calls Manual SIGBLOCK(2) 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 deliv-ery. delivery. ery. 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. SEE ALSO kill(2), sigaction(2), sigprocmask(2), sigsetmask(2), sigsetops(3) HISTORY The sigblock() function call appeared in 4.2BSD and has been deprecated. BSD June 2, 1993 BSD |
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