Tcl/Tk in a Nutshell

Name

trap

trap [options] [[command] signal-list]

Set exception handling behavior. The command command will be executed when any of the signals in the list signal-list occurs.

The command can be a Tcl command or the special values SIG_IGN (ignore) or SIG_DFL (use default action). The signals can be specified by number or name.

Options

-code

Use return code of the handler command.

-interp

Evaluate command using the context active at the time of exception.

-name

Return signal name of the trap command currently being executed.

-max

Return highest available signal number.

Example

trap {send_user "Control-C pressed"} SIGINT