Memory leak---malloc 泄露檢測工具

一. mtrace

#include <stdlib.h>
#include <mcheck.h>
 
void func(void)
{
    int* ptr = malloc(10 * sizeof(int));
    free(ptr);          
}
 
int main(void)
{
    setenv("MALLOC_TRACE", "output_file_name", 1);
    mtrace();
    func();
    return 0;
}

# more output_file_name <-執行方法
= Start
@ ./test:[0x8048426] + 0x804a470 0x28
@ ./test:[0x8048434] - 0x804a470
@ /lib/tls/i686/cmov/libc.so.6:(clearenv+0x7c)[0xb7e149ac] - 0x804a008
@ /lib/tls/i686/cmov/libc.so.6:(tdestroy+0x47)[0xb7ebc6d7] - 0x804a0c0
@ /lib/tls/i686/cmov/libc.so.6:(tdestroy+0x4f)[0xb7ebc6df] - 0x804a0e8 
0x8048426 分配内存空间的指令地址
0x804a470 malloc分配的内存空间己地址
+         表示分配内存
-         表示释放内存
# mtrace output_file_name
- 0x0804a008 Free 4 was never alloc'd 0xb7e149ac
- 0x0804a0c0 Free 5 was never alloc'd 0xb7ebc6d7
- 0x0804a0e8 Free 6 was never alloc'd 0xb7ebc6df
No memory leaks.

若沒有 free 的話
Memory not freed:
-----------------
Address     Size     Caller
0x0804a470  0x28 at  0x80483e6

ref:
weizhiyuan420的空间

二. valgrind

Install: 
    $ sudo apt-get install valgrind

    or

    $ git clone git://sourceware.org/git/valgrind.git

    $ cd valgrind;   ./autogen.sh amd64-linux (or arm-linux);   ./configure --prefix=/usr/local/valgrind;

    $ make; make install
    如果不make intall的話

    $ export VALGRIND_LIB=/home/ubuntu/valgrind/.in_place

Usage:
    $ valgrind --leak-check=full --show-leak-kinds=all --verbose  ./execute_name
    or
    $ valgrind --leak-check=full  --show-leak-kinds=all  --track-origins=yes  --verbose  --log-file=output.txt  ./executable parameter

ref:
1. valgrind.org
2. yipp.ca
3. valgrind 安装使用 failed to start tool memcheck for platform amd64-linux

4. 抓漏 - 使用valgrind檢查C語言memory Leak
5. 抓漏 - Gdb 和 Valgrind 合體技