Dmalloc检测内存泄露

简介:
　　Dmalloc检测内存泄露工具。

安装：
　　① 下载
 　　　　http://dmalloc.com/releases/
　　② 安装
 　　　　tar zxvf dmalloc-5.5.2.tgz
 　　　　cd dmalloc-5.5.2
 　　　　./configure --prefix=/usr
 　　　　make
 　　　　make install

使用:
　　① 环境变量设置
 　　　　/root/.bashrc文件最后一行追加function dmalloc { eval `command dmalloc -b $*`; }
　　② 退出root,重新登陆root
　　③ 编译时，需追加DMALLOC和DMALLOC_FUNC_CHECK
　　④ 链接 libdmalloc.a库
　　⑤ 运行前，需运行命令dmalloc -l logfile -i 100 low

实例：
　　① 手顺
　　　　gcc -DDMALLOC -DDMALLOC_FUNC_CHECK -ldmalloc test.c
　　　　dmalloc -l logfile -i 100 low
　　　　./test

　　② 代码

//gcc -DDMALLOC -DDMALLOC_FUNC_CHECK -ldmalloc test.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef DMALLOC
#include <dmalloc.h>
#endif
int main(int argc, char **argv)
{
  char *string;
  string = (char*)malloc(sizeof(char));
  string = (char*)malloc(sizeof(int*));
  
  return 0;
}

　　③ 解析结果

1378340744: 2: Dmalloc version '5.5.1' from 'http://dmalloc.com/'
1378340744: 2: flags = 0x4e48503, logfile 'logfile'
1378340744: 2: interval = 100, addr = 0, seen # = 0, limit = 0
1378340744: 2: threads enabled, lock-on = 0, lock-init = 2
1378340744: 2: starting time = 1378340744
1378340744: 2: process pid = 27089
1378340744: 2: Dumping Chunk Statistics:
1378340744: 2: basic-block 4096 bytes, alignment 8 bytes
1378340744: 2: heap address range: 0x110000 to 0xd74000, 12992512 bytes
1378340744: 2:     user blocks: 1 blocks, 4069 bytes (9%)
1378340744: 2:    admin blocks: 9 blocks, 36864 bytes (90%)
1378340744: 2:    total blocks: 10 blocks, 40960 bytes
1378340744: 2: heap checked 1
1378340744: 2: alloc calls: malloc 2, calloc 0, realloc 0, free 0
1378340744: 2: alloc calls: recalloc 0, memalign 0, valloc 0
1378340744: 2: alloc calls: new 0, delete 0
1378340744: 2:   current memory in use: 5 bytes (2 pnts)
1378340744: 2:  total memory allocated: 5 bytes (2 pnts)
1378340744: 2:  max in use at one time: 5 bytes (2 pnts)
1378340744: 2: max alloced with 1 call: 4 bytes
1378340744: 2: max unused memory space: 27 bytes (84%)
1378340744: 2: top 10 allocations:
1378340744: 2:  total-size  count in-use-size  count  source
1378340745: 2:           4      1           4      1  test.c:12
1378340745: 2:           1      1           1      1  test.c:11
1378340745: 2:           5      2           5      2  Total of 2
1378340745: 2: Dumping Not-Freed Pointers Changed Since Start:
1378340745: 2:  not freed: '0x797fe8|s1' (4 bytes) from 'test.c:12'
1378340745: 2:  not freed: '0x797ff8|s1' (1 bytes) from 'test.c:11'
1378340745: 2:  total-size  count  source
1378340745: 2:           4      1  test.c:12
1378340745: 2:           1      1  test.c:11
1378340745: 2:           5      2  Total of 2
1378340745: 2: ending time = 1378340745, elapsed since start = 0:00:01