# PXFSIGADDSET (L*X, M*X)

POSIX Subroutine: Adds a signal to the signal set.

## Module

USE IFPOSIX

CALL PXFSIGADDSET (jsigset,isigno,ierror)

jsigset | (Input) INTEGER(4). A handle of structure `sigset`. This is the set to add the signal to.
isigno | (Input) INTEGER(4). The signal number to add to the set.
ierror | (Output) INTEGER(4). The error status.

If successful, ierror is set to zero; otherwise, an error code.

The PXFSIGADDSET subroutine adds signal number isigno to the set of signals associated with handle jsigset. This set of signals is used by PXFSIGACTION as field sa_mask in structure `sigaction`. It defines the set of signals that will be blocked during execution of the signal handler function (the field sa_handler in structure `sigaction`).

On Windows* systems, PXFSIGACTION ignores the field sa_mask in structure `sigaction`.

### Note

To get a handle for an instance of the `sigset` structure, use PXFSTRUCTCREATE with the string 'sigset' for the structure name.

Parent topic: POSIX* Library Routines

## See Also

PXFSTRUCTCREATE
PXFSIGDELSET
PXFSIGACTION