memwatch检测内存泄露

简介:
memwatch简单易用，能检测未被释放的内存，释放多次的内存。

安装：
① 下载
http://www.linkdata.se/sourcecode/memwatch/
② 解压
找出 memwatch.c、memwatch.h即可。

使用:
① 编译时，需追加MEMWATCH(使用memwacth，详见memwatch.h)、MW_STDIO(在控制台输出提示)宏值

实例：
① 手顺
gcc -DMEMWATCH -DMW_STDIO test.c memwatch.c -o test
./test

② 代码

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <errno.h>
 4 #ifdef MEMWATCH
 5 #include "memwatch.h"
 6 #endif 
 7 
 8 void hello()
 9 {
10  char *hello;
11  if ((hello = (char *) malloc(sizeof(char))) == NULL) {
12      perror("Cannot allocate memory.");
13      return;
14  }
15 }
16 
17 int main()
18 {
19  hello();
20  return 0;
21 }

③ 解析结果
============= MEMWATCH 2.71 Copyright (C) 1992-1999 Johan Lindh =============

Started at Wed Sep 4 16:21:26 2013

Modes: __STDC__ 64-bit mwDWORD==(unsigned long)
mwROUNDALLOC==8 sizeof(mwData)==32 mwDataSize==32

Stopped at Wed Sep 4 16:21:26 2013

unfreed: <1> test.c(12), 1 bytes at 0x9dcb1f0 {FE .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .}

Memory usage statistics (global):
N)umber of allocations made: 1
L)argest memory usage : 1
T)otal of all alloc() calls: 1
U)nfreed bytes totals : 1