valgrind检测内存泄露

简介:
      valgrind检测内存泄露工具。功能非常强大，具体详见http://www.valgrind.org/。
      这里只介绍内存检测部分。

     参考实例：

      http://www.ibm.com/developerworks/cn/linux/l-cn-valgrind/

安装：
     ① 下载
          http://www.valgrind.org/
     ② 安装
         tar jxvf valgrind-3.8.1.tar.bz2
         cd valgrind-3.8.1
         ./configure --prefix=/usr
         make
         make install
 
使用:
      valgrind --tool=memcheck --leak-check=full ./test
      参照:
      http://www.valgrind.org/docs/manual/quick-start.html

实例：
     ① 手顺
         gcc test.c -o test
         valgrind --tool=memcheck --leak-check=full ./test
 
 ② 代码

 //gcc test.c -o test
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 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

 ==13226== Memcheck, a memory error detector
==13226== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==13226== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info
==13226== Command: ./test
==13226==
==13226==
==13226== HEAP SUMMARY:
==13226==     in use at exit: 5 bytes in 2 blocks
==13226==   total heap usage: 2 allocs, 0 frees, 5 bytes allocated
==13226==
==13226== 1 bytes in 1 blocks are definitely lost in loss record 1 of 2
==13226==    at 0x4029D56: malloc (vg_replace_malloc.c:270)
==13226==    by 0x80483D8: main (test.c:8)
==13226==
==13226== 4 bytes in 1 blocks are definitely lost in loss record 2 of 2
==13226==    at 0x4029D56: malloc (vg_replace_malloc.c:270)
==13226==    by 0x80483E8: main (test.c:9)
==13226==
==13226== LEAK SUMMARY:
==13226==    definitely lost: 5 bytes in 2 blocks
==13226==    indirectly lost: 0 bytes in 0 blocks
==13226==      possibly lost: 0 bytes in 0 blocks
==13226==    still reachable: 0 bytes in 0 blocks
==13226==         suppressed: 0 bytes in 0 blocks
==13226==
==13226== For counts of detected and suppressed errors, rerun with: -v
==13226== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 11 from 6)