diff options
Diffstat (limited to 'doc/bgerror.n')
| -rw-r--r-- | doc/bgerror.n | 24 |
1 files changed, 5 insertions, 19 deletions
diff --git a/doc/bgerror.n b/doc/bgerror.n index c20e8a0..88922c0 100644 --- a/doc/bgerror.n +++ b/doc/bgerror.n @@ -5,7 +5,7 @@ '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" -'\" RCS: @(#) $Id: bgerror.n,v 1.8 2004/11/13 00:19:05 dgp Exp $ +'\" RCS: @(#) $Id: bgerror.n,v 1.9 2004/11/20 00:17:31 dgp Exp $ '\" .so man.macros .TH bgerror n 7.5 Tcl "Tcl Built-In Commands" @@ -49,8 +49,10 @@ unwinding ends in the Tcl library and there is no obvious way for Tcl to report the error. .PP When Tcl detects a background error, it saves information about the -error and invokes the \fBbgerror\fR command later as an idle event -handler. Before invoking \fBbgerror\fR, Tcl restores the +error and invokes a handler command registered by \fBinterp bgerror\fR +later as an idle event handler. The default handler command in turn +calls the \fBbgerror\fR command . +Before invoking \fBbgerror\fR, Tcl restores the \fBerrorInfo\fR and \fBerrorCode\fR variables to their values at the time the error occurred, then it invokes \fBbgerror\fR with the error message as its only argument. Tcl assumes that the application has @@ -69,22 +71,6 @@ error, in the order they occurred. However, if \fBbgerror\fR returns with a break exception, then any remaining errors are skipped without calling \fBbgerror\fR. .PP -Tcl has no default implementation for \fBbgerror\fR. However, in -applications using Tk there is a default \fBbgerror\fR procedure which -posts a dialog box containing the error message and offers the user a -chance to see a stack trace showing where the error occurred. In -addition to allowing the user to view the stack trace, the dialog -provides an additional application configurable button which may be -used, for example, to save the stack trace to a file. By default, -this is the behavior associated with that button. This behavior can -be redefined by setting the option database values -\fB*ErrorDialog.function.text\fR, to specify the caption for the -function button, and \fB*ErrorDialog.function.command\fR, to specify -the command to be run. The text of the stack trace is appended to the -command when it is evaluated. If either of these options is set to -the empty string, then the additional button will not be displayed in -the dialog. -.PP If you are writing code that will be used by others as part of a package or other kind of library, consider avoiding \fBbgerror\fR. The reason for this is that the application programmer may also want |