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Diffstat (limited to 'doc/TraceVar.3')
| -rw-r--r-- | doc/TraceVar.3 | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/doc/TraceVar.3 b/doc/TraceVar.3 index 2c572d3..3fb3ab6 100644 --- a/doc/TraceVar.3 +++ b/doc/TraceVar.3 @@ -77,22 +77,27 @@ for setting up the trace. It consists of an OR-ed combination of any of the following values: .TP \fBTCL_GLOBAL_ONLY\fR +. Normally, the variable will be looked up at the current level of procedure call; if this bit is set then the variable will be looked up at global level, ignoring any active procedures. .TP \fBTCL_NAMESPACE_ONLY\fR +. Normally, the variable will be looked up at the current level of procedure call; if this bit is set then the variable will be looked up in the current namespace, ignoring any active procedures. .TP \fBTCL_TRACE_READS\fR +. Invoke \fIproc\fR whenever an attempt is made to read the variable. .TP \fBTCL_TRACE_WRITES\fR +. Invoke \fIproc\fR whenever an attempt is made to modify the variable. .TP \fBTCL_TRACE_UNSETS\fR +. Invoke \fIproc\fR whenever the variable is unset. A variable may be unset either explicitly by an \fBunset\fR command, or implicitly when a procedure returns (its local variables are @@ -100,18 +105,21 @@ automatically unset) or when the interpreter or namespace is deleted (all variables are automatically unset). .TP \fBTCL_TRACE_ARRAY\fR +. Invoke \fIproc\fR whenever the array command is invoked. This gives the trace procedure a chance to update the array before array names or array get is called. Note that this is called before an array set, but that will trigger write traces. .TP \fBTCL_TRACE_RESULT_DYNAMIC\fR +. The result of invoking the \fIproc\fR is a dynamically allocated string that will be released by the Tcl library via a call to \fBTcl_Free\fR. Must not be specified at the same time as \fBTCL_TRACE_RESULT_OBJECT\fR. .TP \fBTCL_TRACE_RESULT_OBJECT\fR +. The result of invoking the \fIproc\fR is a Tcl_Obj* (cast to a char*) with a reference count of at least one. The ownership of that reference will be transferred to the Tcl core for release (when the |