内存检测工具valgrind的安装和简单使用

程序员瑞雪技术 2022年11月18日

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1. 安装

tar -jxvf valgrind-3.13..tar.bz2cd valgrind-3.13.sudo ./configuresudo makesudo make install

2. 简单使用

#include <stdio.h>
#include <stdlib.h>void f()
{
    int *x = malloc( * sizeof(int));
    x[] = ;
}int main()
{
    f();    return ;
}

gcc -g val.c -o main.out

valgrind --tool=memcheck --leak-check=yes --show-reachable=yes ./main.out

--leak-check=yes --show-reachable=yes ./main.out
==== Memcheck, a memory error detector
==== Copyright (C) -, and GNU GPL'd, by Julian Seward et al.
==== Using Valgrind-3.13. and LibVEX; rerun with -h for copyright info
==== Command: ./main.out
====
==== Invalid write of size
====    at 0x108668: f (val.c:)
====    by 0x10867E: main (val.c:)
====  Address 0x5857068 is  bytes after a block of size  alloc'd
====    at 0x4C2FB6B: malloc (vg_replace_malloc.c:)
====    by 0x10865B: f (val.c:)
====    by 0x10867E: main (val.c:)
====
====
==== HEAP SUMMARY:
====     in use at exit:  bytes in  blocks
====   total heap usage:  allocs,  frees,  bytes allocated
====
====  bytes in  blocks are definitely lost in loss record  of
====    at 0x4C2FB6B: malloc (vg_replace_malloc.c:)
====    by 0x10865B: f (val.c:)
====    by 0x10867E: main (val.c:)
====
==== LEAK SUMMARY:
====    definitely lost:  bytes in  blocks
====    indirectly lost:  bytes in  blocks
====      possibly lost:  bytes in  blocks
====    still reachable:  bytes in  blocks
====         suppressed:  bytes in  blocks
====
==== For counts of detected and suppressed errors, rerun with: -v
==== ERROR SUMMARY:  errors from  contexts (suppressed:  from )