summaryrefslogtreecommitdiffstats
path: root/doc/SetRecLmt.3
blob: 41c2a0a1743599daccd7cc2d77c31107ed6b33f8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
'\"
'\" Copyright (c) 1989-1993 The Regents of the University of California.
'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\"
.TH Tcl_SetRecursionLimit 3 7.0 Tcl "Tcl Library Procedures"
.so man.macros
.BS
.SH NAME
Tcl_SetRecursionLimit \- set maximum allowable nesting depth in interpreter
.SH SYNOPSIS
.nf
\fB#include <tcl.h>\fR
.sp
int
\fBTcl_SetRecursionLimit\fR(\fIinterp, depth\fR)
.SH ARGUMENTS
.AS Tcl_Interp *interp
.AP Tcl_Interp *interp in
Interpreter whose recursion limit is to be set.
Must be greater than zero.
.AP int depth in
New limit for nested calls to \fBTcl_Eval\fR for \fIinterp\fR.
.BE

.SH DESCRIPTION
.PP
At any given time Tcl enforces a limit on the number of recursive
calls that may be active for \fBTcl_Eval\fR and related procedures
such as \fBTcl_EvalEx\fR.
Any call to \fBTcl_Eval\fR that exceeds this depth is aborted with
an error.
By default the recursion limit is 1000.
.PP
\fBTcl_SetRecursionLimit\fR may be used to change the maximum
allowable nesting depth for an interpreter.
The \fIdepth\fR argument specifies a new limit for \fIinterp\fR,
and \fBTcl_SetRecursionLimit\fR returns the old limit.
To read out the old limit without modifying it, invoke
\fBTcl_SetRecursionLimit\fR with \fIdepth\fR equal to 0.
.PP
The \fBTcl_SetRecursionLimit\fR only sets the size of the Tcl
call stack:  it cannot by itself prevent stack overflows on the
C stack being used by the application.  If your machine has a
limit on the size of the C stack, you may get stack overflows
before reaching the limit set by \fBTcl_SetRecursionLimit\fR.
If this happens, see if there is a mechanism in your system for
increasing the maximum size of the C stack.

.SH KEYWORDS
nesting depth, recursion