zmalloc.c

   1 /* zmalloc - total amount of allocated memory aware version of malloc()
   2  *
   3  * Copyright (c) 2006-2009, Salvatore Sanfilippo <antirez at gmail dot com>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  *   * Redistributions of source code must retain the above copyright notice,
  10  *     this list of conditions and the following disclaimer.
  11  *   * Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  *   * Neither the name of Redis nor the names of its contributors may be used
  15  *     to endorse or promote products derived from this software without
  16  *     specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28  * POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include "config.h"
  35
  36 #if defined(__sun)
  37 #define PREFIX_SIZE sizeof(long long)
  38 #else
  39 #define PREFIX_SIZE sizeof(size_t)
  40 #endif
  41
  42 static size_t used_memory = 0;
  43
  44 static void zmalloc_oom(size_t size) {
  45     fprintf(stderr, "zmalloc: Out of memory trying to allocate %zu bytes\n",
  46         size);
  47     fflush(stderr);
  48     abort();
  49 }
  50
  51 void *zmalloc(size_t size) {
  52     void *ptr = malloc(size+PREFIX_SIZE);
  53
  54     if (!ptr) zmalloc_oom(size);
  55 #ifdef HAVE_MALLOC_SIZE
  56     used_memory += redis_malloc_size(ptr);
  57     return ptr;
  58 #else
  59     *((size_t*)ptr) = size;
  60     used_memory += size+PREFIX_SIZE;
  61     return (char*)ptr+PREFIX_SIZE;
  62 #endif
  63 }
  64
  65 void *zrealloc(void *ptr, size_t size) {
  66 #ifndef HAVE_MALLOC_SIZE
  67     void *realptr;
  68 #endif
  69     size_t oldsize;
  70     void *newptr;
  71
  72     if (ptr == NULL) return zmalloc(size);
  73 #ifdef HAVE_MALLOC_SIZE
  74     oldsize = redis_malloc_size(ptr);
  75     newptr = realloc(ptr,size);
  76     if (!newptr) zmalloc_oom(size);
  77
  78     used_memory -= oldsize;
  79     used_memory += redis_malloc_size(newptr);
  80     return newptr;
  81 #else
  82     realptr = (char*)ptr-PREFIX_SIZE;
  83     oldsize = *((size_t*)realptr);
  84     newptr = realloc(realptr,size+PREFIX_SIZE);
  85     if (!newptr) zmalloc_oom(size);
  86
  87     *((size_t*)newptr) = size;
  88     used_memory -= oldsize;
  89     used_memory += size;
  90     return (char*)newptr+PREFIX_SIZE;
  91 #endif
  92 }
  93
  94 void zfree(void *ptr) {
  95 #ifndef HAVE_MALLOC_SIZE
  96     void *realptr;
  97     size_t oldsize;
  98 #endif
  99
 100     if (ptr == NULL) return;
 101 #ifdef HAVE_MALLOC_SIZE
 102     used_memory -= redis_malloc_size(ptr);
 103     free(ptr);
 104 #else
 105     realptr = (char*)ptr-PREFIX_SIZE;
 106     oldsize = *((size_t*)realptr);
 107     used_memory -= oldsize+PREFIX_SIZE;
 108     free(realptr);
 109 #endif
 110 }
 111
 112 char *zstrdup(const char *s) {
 113     size_t l = strlen(s)+1;
 114     char *p = zmalloc(l);
 115
 116     memcpy(p,s,l);
 117     return p;
 118 }
 119
 120 size_t zmalloc_used_memory(void) {
 121     return used_memory;
 122 }