m_init.c

对内存的分配、释放和使用进行检查

/*
 * (c) Copyright 1990 Conor P. Cahill (uunet!virtech!cpcahil).  
 * You may copy, distribute, and use this software as long as this
 * copyright statement is not removed.
 */
#include <stdio.h>
#include "malloc.h"

/*
 * Function:	malloc_init()
 *
 * Purpose:	to initialize the pointers and variables use by the
 *		malloc() debugging library
 *
 * Arguments:	none
 *
 * Returns:	nothing of any value
 *
 * Narrative:	Just initialize all the needed variables.  Use mallopt
 *		to set options taken from the environment.
 *
 */
#ifndef lint
static
char rcs_hdr[] = "$Id: m_init.c,v 1.4 90/05/11 15:53:35 cpcahil Exp $";
#endif

void
malloc_init()
{
	char			* cptr;
	char			* getenv();
	extern char		* malloc_data_end;
	extern char		* malloc_data_start;
	extern struct mlist	* malloc_end;
	extern struct mlist	  malloc_start;
	char			* sbrk();

	/*
 	 * If already initialized...
	 */
	if( malloc_data_start != (char *) 0)
	{
		return;
	}


	malloc_data_start = sbrk(0);
	malloc_data_end = malloc_data_start;
	malloc_start.s.size = 0;
	malloc_end = &malloc_start;
	
	if( (cptr=getenv("MALLOC_WARN")) != NULL )
	{
		mallopt(MALLOC_WARN,atoi(cptr));
	}

	if( (cptr=getenv("MALLOC_FATAL")) != NULL)
	{
		mallopt(MALLOC_FATAL,atoi(cptr));
	}

	if( (cptr=getenv("MALLOC_CKCHAIN")) != NULL)
	{
		mallopt(MALLOC_CKCHAIN,atoi(cptr));
	}

	if( (cptr=getenv("MALLOC_ERRFILE")) != NULL)
	{
		mallopt(MALLOC_ERRFILE,cptr);
	}

}

/*
 * $Log:	m_init.c,v $
 * Revision 1.4  90/05/11  15:53:35  cpcahil
 * fixed bug in initialization code.
 * 
 * Revision 1.3  90/05/11  00:13:08  cpcahil
 * added copyright statment
 * 
 * Revision 1.2  90/02/24  21:50:20  cpcahil
 * lots of lint fixes
 * 
 * Revision 1.1  90/02/24  17:10:53  cpcahil
 * Initial revision
 * 
 */