sigblock - Provides a compatibility interface to the sigprocmask function
Standard C Library (libc.a)
int mask );
mask Specifies the signals to be added to the set of signals currently
being blocked from delivery.
The sigblock() function causes the signals specified by the mask parameter
to be added to the set of signals currently being blocked from delivery.
The signals are blocked from delivery by logically ORing the mask parameter
into the signal mask of the process. Signal i is blocked if the i-th bit
in the mask parameter is a value of 1. Only signals with values 1-31 can be
masked with the sigblock() function.
It is not possible to block SIGKILL. The system provides no indication of
The sigblock() function is provided for compatibility to other UNIX sys-
tems. Its function is a subset of the sigprocmask() function.
On completion, the previous set of masked signals is returned.
Functions: kill(2), sigaction(2), sigpause(3), sigprocmask(2), sig-