Linux内存泄漏检查工具： valgrind

valgrind工具功能很多，可以动态检测程序运行时的问题，其中一项就是检测内存泄漏。

使用方法： valgrind [options] prog-and-args

用例：

问题程序代码: memleak.c

#include <stdio.h>
#include <stdlib.h>

main(int argc, char **argv)
{

  char *p = malloc(5);
  char *q = malloc(10);

  free(p);
  //free(q);

  return;
}

运行程序: valgrind ./memleak

输出结果:

==17823== Memcheck, a memory error detector
==17823== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al.
==17823== Using Valgrind-3.6.0.SVN-Debian and LibVEX; rerun with -h for copyright info
==17823== Command: ./memleak
==17823== 
==17823== 
==17823== HEAP SUMMARY:
==17823==     in use at exit: 10 bytes in 1 blocks
==17823==   total heap usage: 2 allocs, 1 frees, 15 bytes allocated
==17823== 
==17823== LEAK SUMMARY:
==17823==    definitely lost: 10 bytes in 1 blocks
==17823==    indirectly lost: 0 bytes in 0 blocks
==17823==      possibly lost: 0 bytes in 0 blocks
==17823==    still reachable: 0 bytes in 0 blocks
==17823==         suppressed: 0 bytes in 0 blocks
==17823== Rerun with --leak-check=full to see details of leaked memory
==17823== 
==17823== For counts of detected and suppressed errors, rerun with: -v
==17823== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 12 from 7)

红色字体部分显示程序有两次动态内存分配，共15个字节，只free了一次，内存泄漏10个字节

valgrind缺点：

目前好像只适用于GNU/LINUX x86平台