valgrind - a suite of tools for debugging and profiling programs_valgrind3.3 advanced debugging and-优快云博客

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本文介绍使用Valgrind工具进行内存泄漏检测的方法。Valgrind是一款强大的调试和剖析工具，能够帮助开发者发现程序中的内存泄漏问题。文章通过一个简单的C语言示例，展示了如何利用Valgrind定位和修复内存泄漏。

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VALGRIND(1)                                                                   Release 3.7.0                                                                   VALGRIND(1)

NAME
       valgrind - a suite of tools for debugging and profiling programs

SYNOPSIS
       valgrind [valgrind-options] [your-program] [your-program-options]

DESCRIPTION
       Valgrind is a flexible program for debugging and profiling Linux executables. It consists of a core, which provides a synthetic CPU in software, and a series of
       debugging and profiling tools. The architecture is modular, so that new tools can be created easily and without disturbing the existing structure.

       Some of the options described below work with all Valgrind tools, and some only work with a few or one. The section MEMCHECK OPTIONS and those below it describe
       tool-specific options.

       This manual page covers only basic usage and options. For more comprehensive information, please see the HTML documentation on your system:
       $INSTALL/share/doc/valgrind/html/index.html, or online: http://www.valgrind.org/docs/manual/index.html.

Example:

wgao@pek-wgao-d1:~$ cat leak.c
#include<stdio.h>
#include<stdlib.h>
#include <string.h>

int main()
{
    int * x = NULL;
    /*int a[10] = {0};
    x = a;
    *x = 1;
    printf ("%d\n",*x);
    x[9] = 0;
    printf ("%d\n",*x);
    */
    x = malloc (10 * sizeof(int));
    memset(x,0,10);
    *x = 1;
    printf ("%d\n",*x);
    x[9] = 0;
    #free(x);
}

wgao@pek-wgao-d1:~$
wgao@pek-wgao-d1:~$ gcc -o leak -O0 -g leak.c

wgao@pek-wgao-d1:~$ sudo valgrind --leak-check=full -v ./leak
==14363== HEAP SUMMARY:
==14363==     in use at exit: 40 bytes in 1 blocks
==14363==   total heap usage: 1 allocs, 0 frees, 40 bytes allocated
==14363==
==14363== Searching for pointers to 1 not-freed blocks
==14363== Checked 72,456 bytes
==14363==
==14363== 40 bytes in 1 blocks are definitely lost in loss record 1 of 1
==14363==    at 0x4C2B6CD: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==14363==    by 0x40055D: main (leak.c:15)
==14363==
==14363== LEAK SUMMARY:
==14363==    definitely lost: 40 bytes in 1 blocks
==14363==    indirectly lost: 0 bytes in 0 blocks
==14363==      possibly lost: 0 bytes in 0 blocks
==14363==    still reachable: 0 bytes in 0 blocks
==14363==         suppressed: 0 bytes in 0 blocks
==14363==
==14363== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 2 from 2)
--14363--
--14363-- used_suppression:      2 dl-hack3-cond-1
==14363==
==14363== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 2 from 2)
wgao@pek-wgao-d1:~$