error - Generate an error
error message ?info? ?code?
Returns a TCL_ERROR code, which causes command interpretation to be
unwound. Message is a string that is returned to the application
to indicate what went wrong.
If the info argument is provided and is non-empty,
it is used to initialize the global variable errorInfo.
errorInfo is used to accumulate a stack trace of what
was in progress when an error occurred; as nested commands unwind,
the Tcl interpreter adds information to errorInfo. If the
info argument is present, it is used to initialize
errorInfo and the first increment of unwind information
will not be added by the Tcl interpreter. In other
words, the command containing the error command will not appear
in errorInfo; in its place will be info.
This feature is most useful in conjunction with the catch command:
if a caught error cannot be handled successfully, info can be used
to return a stack trace reflecting the original point of occurrence
of the error:
catch {...} errMsg
set savedInfo $errorInfo
...
error $errMsg $savedInfo
If the code argument is present, then its value is stored
in the errorCode global variable. This variable is intended
to hold a machine-readable description of the error in cases where
such information is available; see the tclvars manual
page for information on the proper format for the variable.
If the code argument is not
present, then errorCode is automatically reset to
``NONE'' by the Tcl interpreter as part of processing the
error generated by the command.
error, errorCode, errorInfo
Copyright © 1993 The Regents of the University of California.
Copyright © 1994-1996 Sun Microsystems, Inc.
Copyright © 1995-1997 Roger E. Critchlow Jr.
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