sigblock, sigmask - block signals #include <signal.h>

DESCRIPTION
This interface is made obsolete by: adds the signals specified in to the set of signals currently being blocked from delivery. Signals are blocked if the corresponding bit in is a 1; the macro is provided to construct the mask for a given It is not possible to block or this restriction is silently imposed by the system. The previous set of masked signals is returned.

HISTORY
These function calls appeared in BSD 4.3 and have been deprecated.