signal

Type

message

Summary

Sent to the current card when another process sends a kill signal to the application.

Syntax

signal <pSigNumber>

Description

Handle the signal message to perform cleanup before an external process causes the application to exit.

The user can execute the Unix "kill" command to send a kill signal to the application. Other processes can use a Unix system call to send a kill signal.

Only signal 1 (SIGUSR1) and signal 2 (SIGUSR2) are supported. Other signals sent to the application do not cause the signal message to be sent.

Parameters

Name	Type	Description
pSigNumber		The number of the Unix kill signal (1 for SIGUSR1, 2 for SIGUSR2) that was sent to the application.

Examples

on signal -- let the user know:
  answer warning "Ack! I've been killed by another application!"
end signal

Related

control structure: exit

glossary: application, current card, message, process

command: kill

Compatibility and Support

Introduced

LiveCode 1.0

OS

mac

linux

Platforms

desktop

server