Constructs the mask for a given signal number.

    Format

      #include  <signal.h>

      int sigmask  (signum);

1  –  Argument

 signum

    The signal number for which the mask is to be constructed.

2  –  Description

    The sigmask function is used to construct the mask for a given
    signum. This mask can be used with the sigblock function.

3  –  Return Value

    x                  The mask constructed for signum