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- '\" $Header: /user6/ouster/tcl/man/RCS/CrtTrace.3,v 1.8 93/04/01 09:25:26 ouster Exp $ SPRITE (Berkeley)
- '\"
- .\" The definitions below are for supplemental macros used in Tcl/Tk
- .\" manual entries.
- .\"
- .\" .HS name section [date [version]]
- .\" Replacement for .TH in other man pages. See below for valid
- .\" section names.
- .\"
- .\" .AP type name in/out [indent]
- .\" Start paragraph describing an argument to a library procedure.
- .\" type is type of argument (int, etc.), in/out is either "in", "out",
- .\" or "in/out" to describe whether procedure reads or modifies arg,
- .\" and indent is equivalent to second arg of .IP (shouldn't ever be
- .\" needed; use .AS below instead)
- .\"
- .\" .AS [type [name]]
- .\" Give maximum sizes of arguments for setting tab stops. Type and
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- .\"
- .\" .BS
- .\" Start box enclosure. From here until next .BE, everything will be
- .\" enclosed in one large box.
- .\"
- .\" .BE
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- .\"
- .\" .VS
- .\" Begin vertical sidebar, for use in marking newly-changed parts
- .\" of man pages.
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- .\" .DS
- .\" Begin an indented unfilled display.
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- .\"
- '\" # Heading for Tcl/Tk man pages
- .de HS
- .ds ^3 \\0
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- .if t .wh -1.3i ^B
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- .\"
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- .el .nr ^v 1u
- ..
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- '\" # page bottom macro.
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- .\}
- .if \\n(^v \{\
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- ..
- .HS Tcl_CreateTrace tclc
- .BS
- .SH NAME
- Tcl_CreateTrace, Tcl_DeleteTrace \- arrange for command execution to be traced
- .SH SYNOPSIS
- .nf
- \fB#include <tcl.h>\fR
- .sp
- Tcl_Trace
- \fBTcl_CreateTrace\fR(\fIinterp, level, proc, clientData\fR)
- .sp
- \fBTcl_DeleteTrace\fR(\fIinterp, trace\fR)
- .SH ARGUMENTS
- .AS Tcl_CmdTraceProc (clientData)()
- .AP Tcl_Interp *interp in
- Interpreter containing command to be traced or untraced.
- .AP int level in
- Only commands at or below this nesting level will be traced. 1 means
- top-level commands only, 2 means top-level commands or those that are
- invoked as immediate consequences of executing top-level commands
- (procedure bodies, bracketed commands, etc.) and so on.
- .AP Tcl_CmdTraceProc *proc in
- Procedure to call for each command that's executed. See below for
- details on the calling sequence.
- .AP ClientData clientData in
- Arbitrary one-word value to pass to \fIproc\fR.
- .AP Tcl_Trace trace in
- Token for trace to be removed (return value from previous call
- to \fBTcl_CreateTrace\fR).
- .BE
-
- .SH DESCRIPTION
- .PP
- \fBTcl_CreateTrace\fR arranges for command tracing. From now on, \fIproc\fR
- will be invoked before Tcl calls command procedures to process
- commands in \fIinterp\fR. The return value from
- \fBTcl_CreateTrace\fR is a token for the trace,
- which may be passed to \fBTcl_DeleteTrace\fR to remove the trace. There may
- be many traces in effect simultaneously for the same command interpreter.
- .PP
- \fIProc\fR should have arguments and result that match the
- type \fBTcl_CmdTraceProc\fR:
- .nf
- .sp
- .RS
- typedef void Tcl_CmdTraceProc(
- .RS
- ClientData \fIclientData\fR,
- Tcl_Interp *\fIinterp\fR,
- int \fIlevel\fR,
- char *\fIcommand\fR,
- Tcl_CmdProc *\fIcmdProc\fR,
- ClientData \fIcmdClientData\fR,
- int \fIargc\fR,
- char *\fIargv\fR[]));
- .sp
- .RE
- .RE
- .fi
- The \fIclientData\fP and \fIinterp\fP parameters are
- copies of the corresponding arguments given to \fBTcl_CreateTrace\fR.
- \fIClientData\fR typically points to an application-specific
- data structure that describes what to do when \fIproc\fR
- is invoked. \fILevel\fR gives the nesting level of the command
- (1 for top-level commands passed to \fBTcl_Eval\fR by the application,
- 2 for the next-level commands passed to \fBTcl_Eval\fR as part of parsing
- or interpreting level-1 commands, and so on). \fICommand\fR
- points to a string containing the text of the
- command, before any argument substitution.
- \fICmdProc\fR contains the address of the command procedure that
- will be called to process the command (i.e. the \fIproc\fR argument
- of some previous call to \fBTcl_CreateCommand\fR) and \fIcmdClientData\fR
- contains the associated client data for \fIcmdProc\fR (the \fIclientData\fR
- value passed to \fBTcl_CreateCommand\fR). \fIArgc\fR and \fIargv\fR give
- the final argument information that will be passed to \fIcmdProc\fR, after
- command, variable, and backslash substitution.
- \fIProc\fR must not modify the \fIcommand\fR or \fIargv\fR strings.
- .PP
- Tracing will only occur for commands at nesting level less than
- or equal to the \fIlevel\fR parameter (i.e. the \fIlevel\fR
- parameter to \fIproc\fR will always be less than or equal to the
- \fIlevel\fR parameter to \fBTcl_CreateTrace\fR).
- .PP
- Calls to \fIproc\fR will be made by the Tcl parser immediately before
- it calls the command procedure for the command (\fIcmdProc\fR). This
- occurs after argument parsing and substitution, so tracing for
- substituted commands occurs before tracing of the commands
- containing the substitutions. If there is a syntax error in a
- command, or if there is no command procedure associated with a
- command name, then no tracing will occur for that command. If a
- string passed to Tcl_Eval contains multiple commands (bracketed, or
- on different lines) then multiple calls to \fIproc\fR will occur,
- one for each command. The \fIcommand\fR string for each of these
- trace calls will reflect only a single command, not the entire string
- passed to Tcl_Eval.
- .PP
- \fBTcl_DeleteTrace\fR removes a trace, so that no future calls will be
- made to the procedure associated with the trace. After \fBTcl_DeleteTrace\fR
- returns, the caller should never again use the \fItrace\fR token.
-
- .SH KEYWORDS
- command, create, delete, interpreter, trace
-