man/man3/Tcl_AttemptRealloc.3 - toolchains/skids - Git at Google

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 .TH Tcl_Alloc 3 7.5 Tcl "Tcl Library Procedures"
 .BS
 .SH NAME
 Tcl_Alloc, Tcl_Free, Tcl_Realloc, Tcl_AttemptAlloc, Tcl_AttemptRealloc, ckalloc, ckfree, ckrealloc, attemptckalloc, attemptckrealloc \- allocate or free heap memory
 .SH SYNOPSIS
 .nf
 \fB#include <tcl.h>\fR
 .sp
 char *
 \fBTcl_Alloc\fR(\fIsize\fR)
 .sp
 void
 \fBTcl_Free\fR(\fIptr\fR)
 .sp
 char *
 \fBTcl_Realloc\fR(\fIptr, size\fR)
 .sp
 char *
 \fBTcl_AttemptAlloc\fR(\fIsize\fR)
 .sp
 char *
 \fBTcl_AttemptRealloc\fR(\fIptr, size\fR)
 .sp
 char *
 \fBckalloc\fR(\fIsize\fR)
 .sp
 void
 \fBckfree\fR(\fIptr\fR)
 .sp
 char *
 \fBckrealloc\fR(\fIptr, size\fR)
 .sp
 char *
 \fBattemptckalloc\fR(\fIsize\fR)
 .sp
 char *
 \fBattemptckrealloc\fR(\fIptr, size\fR)
 .SH ARGUMENTS
 .AS char *size
 .AP int size in
 Size in bytes of the memory block to allocate.
 .AP char *ptr in
 Pointer to memory block to free or realloc.
 .BE

 .SH DESCRIPTION
 .PP
 These procedures provide a platform and compiler independent interface
 for memory allocation.  Programs that need to transfer ownership of
 memory blocks between Tcl and other modules should use these routines
 rather than the native \fBmalloc()\fR and \fBfree()\fR routines
 provided by the C run-time library.
 .PP
 \fBTcl_Alloc\fR returns a pointer to a block of at least \fIsize\fR
 bytes suitably aligned for any use.
 .PP
 \fBTcl_Free\fR makes the space referred to by \fIptr\fR available for
 further allocation.
 .PP
 \fBTcl_Realloc\fR changes the size of the block pointed to by
 \fIptr\fR to \fIsize\fR bytes and returns a pointer to the new block.
 The contents will be unchanged up to the lesser of the new and old
 sizes.  The returned location may be different from \fIptr\fR.
 .PP
 \fBTcl_AttemptAlloc\fR and \fBTcl_AttemptRealloc\fR are identical in
 function to \fBTcl_Alloc\fR and \fBTcl_Realloc\fR, except that
 \fBTcl_AttemptAlloc\fR and \fBTcl_AttemptRealloc\fR will not cause the Tcl
 interpreter to \fBpanic\fR if the memory allocation fails.  If the
 allocation fails, these functions will return NULL.  Note that on some
 platforms, attempting to allocate a block of memory will also cause
 these functions to return NULL.
 .PP
 The procedures \fBckalloc\fR, \fBckfree\fR, \fBckrealloc\fR,
 \fBattemptckalloc\fR, and \fBattemptckrealloc\fR are implemented
 as macros.  Normally, they are synonyms for the corresponding
 procedures documented on this page.  When Tcl and all modules
 calling Tcl are compiled with \fBTCL_MEM_DEBUG\fR defined, however,
 these macros are redefined to be special debugging versions of
 of these procedures.  To support Tcl's memory debugging within a
 module, use the macros rather than direct calls to \fBTcl_Alloc\fR, etc.

 .SH KEYWORDS
 alloc, allocation, free, malloc, memory, realloc, TCL_MEM_DEBUG
	'\"
	'\" Copyright (c) 1995-1996 Sun Microsystems, Inc.
	'\"
	'\" See the file "license.terms" for information on usage and redistribution
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	'\"
	'\" RCS: @(#) $Id: Alloc.3,v 1.8 2002/10/09 09:38:38 dkf Exp $
	'\"
	'\" The definitions below are for supplemental macros used in Tcl/Tk
	'\" manual entries.
	'\"
	'\" .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
	'\" name are examples of largest possible arguments that will be passed
	'\" to .AP later. If args are omitted, default tab stops are used.
	'\"
	'\" .BS
	'\" Start box enclosure. From here until next .BE, everything will be
	'\" enclosed in one large box.
	'\"
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	'\" End of box enclosure.
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	'\" Start of list of standard options for a Tk widget. The
	'\" options follow on successive lines, in four columns separated
	'\" by tabs.
	'\"
	'\" .SE
	'\" End of list of standard options for a Tk widget.
	'\"
	'\" .OP cmdName dbName dbClass
	'\" Start of description of a specific option. cmdName gives the
	'\" option's name as specified in the class command, dbName gives
	'\" the option's name in the option database, and dbClass gives
	'\" the option's class in the option database.
	'\"
	'\" .UL arg1 arg2
	'\" Print arg1 underlined, then print arg2 normally.
	'\"
	'\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
	'\"
	'\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
	.if t .wh -1.3i ^B
	.nr ^l \n(.l
	.ad b
	'\" # Start an argument description
	.de AP
	.ie !"\\$4"" .TP \\$4
	.el \{\
	. ie !"\\$2"" .TP \\n()Cu
	. el .TP 15
	.\}
	.ta \\n()Au \\n()Bu
	.ie !"\\$3"" \{\
	\&\\$1 \\fI\\$2\\fP (\\$3)
	.\".b
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	..
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	.if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
	.nr )C \\n()Bu+\\w'(in/out)'u+2n
	..
	.AS Tcl_Interp Tcl_CreateInterp in/out
	'\" # BS - start boxed text
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	.\}
	.el \}\
	\h'-1.5n'\L'\|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'\|0u-1.5n\(ul'
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	.\" draw two sides but no top otherwise.
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	.\}
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	.nr ^x \\n(^tu+1v-\\n(^Yu
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	.mk ^y
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	.de SO
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	.LP
	.nf
	.ta 5.5c 11c
	.ft B
	..
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	.de SE
	.fi
	.ft R
	.LP
	See the \\fBoptions\\fR manual entry for details on the standard options.
	..
	'\" # OP - start of full description for a single option
	.de OP
	.LP
	.nf
	.ta 4c
	Command-Line Name: \\fB\\$1\\fR
	Database Name: \\fB\\$2\\fR
	Database Class: \\fB\\$3\\fR
	.fi
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	..
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	\\$1\l'\|0\(ul'\\$2
	..
	.TH Tcl_Alloc 3 7.5 Tcl "Tcl Library Procedures"
	.BS
	.SH NAME
	Tcl_Alloc, Tcl_Free, Tcl_Realloc, Tcl_AttemptAlloc, Tcl_AttemptRealloc, ckalloc, ckfree, ckrealloc, attemptckalloc, attemptckrealloc \- allocate or free heap memory
	.SH SYNOPSIS
	.nf
	\fB#include <tcl.h>\fR
	.sp
	char *
	\fBTcl_Alloc\fR(\fIsize\fR)
	.sp
	void
	\fBTcl_Free\fR(\fIptr\fR)
	.sp
	char *
	\fBTcl_Realloc\fR(\fIptr, size\fR)
	.sp
	char *
	\fBTcl_AttemptAlloc\fR(\fIsize\fR)
	.sp
	char *
	\fBTcl_AttemptRealloc\fR(\fIptr, size\fR)
	.sp
	char *
	\fBckalloc\fR(\fIsize\fR)
	.sp
	void
	\fBckfree\fR(\fIptr\fR)
	.sp
	char *
	\fBckrealloc\fR(\fIptr, size\fR)
	.sp
	char *
	\fBattemptckalloc\fR(\fIsize\fR)
	.sp
	char *
	\fBattemptckrealloc\fR(\fIptr, size\fR)
	.SH ARGUMENTS
	.AS char *size
	.AP int size in
	Size in bytes of the memory block to allocate.
	.AP char *ptr in
	Pointer to memory block to free or realloc.
	.BE

	.SH DESCRIPTION
	.PP
	These procedures provide a platform and compiler independent interface
	for memory allocation. Programs that need to transfer ownership of
	memory blocks between Tcl and other modules should use these routines
	rather than the native \fBmalloc()\fR and \fBfree()\fR routines
	provided by the C run-time library.
	.PP
	\fBTcl_Alloc\fR returns a pointer to a block of at least \fIsize\fR
	bytes suitably aligned for any use.
	.PP
	\fBTcl_Free\fR makes the space referred to by \fIptr\fR available for
	further allocation.
	.PP
	\fBTcl_Realloc\fR changes the size of the block pointed to by
	\fIptr\fR to \fIsize\fR bytes and returns a pointer to the new block.
	The contents will be unchanged up to the lesser of the new and old
	sizes. The returned location may be different from \fIptr\fR.
	.PP
	\fBTcl_AttemptAlloc\fR and \fBTcl_AttemptRealloc\fR are identical in
	function to \fBTcl_Alloc\fR and \fBTcl_Realloc\fR, except that
	\fBTcl_AttemptAlloc\fR and \fBTcl_AttemptRealloc\fR will not cause the Tcl
	interpreter to \fBpanic\fR if the memory allocation fails. If the
	allocation fails, these functions will return NULL. Note that on some
	platforms, attempting to allocate a block of memory will also cause
	these functions to return NULL.
	.PP
	The procedures \fBckalloc\fR, \fBckfree\fR, \fBckrealloc\fR,
	\fBattemptckalloc\fR, and \fBattemptckrealloc\fR are implemented
	as macros. Normally, they are synonyms for the corresponding
	procedures documented on this page. When Tcl and all modules
	calling Tcl are compiled with \fBTCL_MEM_DEBUG\fR defined, however,
	these macros are redefined to be special debugging versions of
	of these procedures. To support Tcl's memory debugging within a
	module, use the macros rather than direct calls to \fBTcl_Alloc\fR, etc.

	.SH KEYWORDS
	alloc, allocation, free, malloc, memory, realloc, TCL_MEM_DEBUG