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.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
.\" Distributed under GPL
.\" Heavily based on glibc documentation
.\" Polished, added docs, removed glibc doc bug, 2002-07-20, aeb
.\"
.\" Japanese Version Copyright (c) 2002 Akihiro MOTOKI all rights reserved.
.\" Translated Thu 05 Dec 2002 by Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
.TH MALLOC_HOOK 3 2002-07-20 "GNU" "Linux Programmer's Manual"
.SH ̾
__malloc_hook, __malloc_initialize_hook,
__memalign_hook, __free_hook, __realloc_hook,
__after_morecore_hook \- malloc ǥХåѤѿ
.SH
.nf
.B "#include <malloc.h>"
.sp
.BI "void *(*__malloc_hook)(size_t " size ", const void *" caller );
.sp
.BI "void *(*__realloc_hook)(void *" ptr ", size_t " size \
", const void *" caller );
.sp
.BI "void *(*__memalign_hook)(size_t " alignment ", size_t " size ,
.BI " const void *" caller );
.sp
.BI "void (*__free_hook)(void *" ptr ", const void *" caller );
.sp
.B "void (*__malloc_initialize_hook)(void);"
.sp
.B "void (*__after_morecore_hook)(void);"
.fi
.SH
GNU C 饤֥ǤϡŬڤʥեåؿ (hook function) ꤹ뤳Ȥ
.BR malloc (3),
.BR realloc (3),
.BR free (3)
ưѹ뤳ȤǤ롣㤨СưŪ˥ƤԤ
ץΥǥХåˤΥեåȤȤǤ롣
.LP
ѿ
.B __malloc_initialize_hook
malloc μݤ˰٤ƤФؿؤΥݥǤ롣
ѿϽǽ (weak) Ǥꡢץꥱ
ʲΤ褦ǾǤ:
.nf
void (*__malloc_initialize_hook)(void) = my_init_hook;
.fi
ʤؿ
.IR my_init_hook ()
ƤΥեåν뤳ȤǤ롣
.LP
.BR __malloc_hook ,
.BR __realloc_hook ,
.BR __memalign_hook ,
.B __free_hook
ǻؤ 4 Ĥδؿϡơ
.BR malloc (3),
.BR realloc (3),
.BR memalign (3),
.BR free (3)
Ȥ褯ץȥפäƤ뤬
ֺǸΰ
.I caller
Ȥۤʤ롣
.I caller
ˤϡ
.BR malloc (3)
ʤɤθƤӽФ (caller) Υɥ쥹Ǽ롣
.LP
ѿ
.B __after_morecore_hook
ϡΰɲ
.BR sbrk (2)
ƤФ줿ƤӽФؿؤΥݥǤ롣
.SH
δؿ GNU ˤĥǤ롣
.SH
ѿλȤδñʲ˼
.sp
.nf
#include <stdio.h>
#include <malloc.h>
/* ȤȤեåΥץȥ */
static void my_init_hook(void);
static void *my_malloc_hook(size_t, const void *);
/* Υեå¸뤿ѿ */
static void *(*old_malloc_hook)(size_t, const void *);
/* C 饤֥꤫ƤФեå */
void (*__malloc_initialize_hook) (void) = my_init_hook;
static void
my_init_hook(void)
{
old_malloc_hook = __malloc_hook;
__malloc_hook = my_malloc_hook;
}
static void *
my_malloc_hook(size_t size, const void *caller)
{
void *result;
/* Υեå᤹ */
__malloc_hook = old_malloc_hook;
/* malloc κƵŪƤӽФ */
result = malloc(size);
/* ꤵƤեå (underlying hook) ¸ */
old_malloc_hook = __malloc_hook;
/* printf() malloc() ƤӽФǽΤ
Ǥ⥬ɤԤ (ΥեåΤޤޤˤƤ) */
printf("malloc(%u) called from %p returns %p\\n",
(unsigned int) size, caller, result);
/* 桼ȤȤեåꤹ */
__malloc_hook = my_malloc_hook;
return result;
}
.fi
.SH Ϣ
.BR mallinfo (3),
.BR malloc (3),
.BR mcheck (3),
.BR mtrace (3)
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