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/*****************************************************************************\
*
* $Id: xmalloc.c,v 1.13 2002/08/11 02:47:42 garlick Exp $
* $Source: /chaos/cvs/pdsh/xmalloc.c,v $
*
* Copyright (C) 1998-2002 The Regents of the University of California.
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
* Written by Jim Garlick (garlick@llnl.gov>
* UCRL-CODE-980038
*
* This file is part of PDSH, a parallel remote shell program.
* For details, see <http://www.llnl.gov/linux/pdsh/>.
*
* PDSH is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* PDSH is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with PDSH; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
\*****************************************************************************/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <limits.h> /* for INT_MAX */
#include <assert.h>
#include "xmalloc.h"
#if HAVE_UNSAFE_MALLOC
#include <pthread.h>
static pthread_mutex_t malloc_lock = PTHREAD_MUTEX_INITIALIZER;
#define MALLOC_LOCK() pthread_mutex_lock(&malloc_lock)
#define MALLOC_UNLOCK() pthread_mutex_unlock(&malloc_lock)
#else
#define MALLOC_LOCK()
#define MALLOC_UNLOCK()
#endif
/*
* "Safe" version of malloc().
* size (IN) number of bytes to malloc
* RETURN pointer to allocate heap space
*/
void *
Malloc(size_t size)
{
void *new;
int *p;
assert(size > 0 && size <= INT_MAX);
MALLOC_LOCK();
p = (int *)malloc(size + 2*sizeof(int));
MALLOC_UNLOCK();
if (!p) {
fprintf(stderr, "Malloc(%d) failed\n", size);
exit(1);
}
p[0] = XMALLOC_MAGIC; /* add "secret" magic cookie */
p[1] = size; /* store size in buffer */
new = &p[2];
memset(new, 0, size);
return new;
}
/*
* "Safe" version of realloc(). Args are different: pass in a pointer to
* the object to be realloced instead of the object itself.
* item (IN/OUT) double-pointer to allocated space
* newsize (IN) requested size
*/
void
Realloc(void **item, size_t newsize)
{
int *p = (int *)*item - 2;
assert(*item != NULL);
assert(newsize > 0 && newsize <= INT_MAX);
assert(p[0] == XMALLOC_MAGIC); /* magic cookie still there? */
MALLOC_LOCK();
p = (int *)realloc(p, newsize + 2*sizeof(int));
MALLOC_UNLOCK();
if (!p) {
fprintf(stderr, "Realloc(%d) failed\n", newsize);
exit(1);
}
assert(p[0] == XMALLOC_MAGIC);
p[1] = newsize;
*item = &p[2];
}
/*
* Duplicate a string.
* str (IN) string to duplicate
* RETURN copy of string
*/
char *
Strdup(char *str)
{
char *result = Malloc(strlen(str) + 1);
return strcpy(result, str);
}
/*
* Return the size of a buffer.
* item (IN) pointer to allocated space
*/
int
Size(void *item)
{
int *p = (int *)item - 2;
assert(item != NULL);
assert(p[0] == XMALLOC_MAGIC);
return p[1];
}
/*
* Free which takes a pointer to object to free, which it turns into a null
* object.
* item (IN/OUT) double-pointer to allocated space
*/
void
Free(void **item)
{
int *p = (int *)*item - 2;
if (*item != NULL) {
assert(p[0] == XMALLOC_MAGIC); /* magic cookie still there? */
p[0] = 0;
MALLOC_LOCK();
free(p);
MALLOC_UNLOCK();
*item = NULL;
}
}
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