sigblock

Adds the signals in mask to the current set of signals being blocked from delivery.

Format 

#include  <signal.h>

int sigblock  (int mask);

Argument

mask
The signals to be blocked.

Description

Signal i is blocked if the i - 1 bit in mask is a 1. For example, to add the protection-violation signal to the set of blocked signals, use the following line: 
sigblock(1 << (SIGBUS - 1));

You can express signals in mnemonics (such as SIGBUS for a protection violation) or numbers as defined in the <signal.h> header file, and you can express combinations of signals by using the bitwise OR operator (|).

Return Value
x  Indicates the previous set of masked signals. 

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