mtrace检查内存泄露

mtrace内存泄漏检测：

1. 安装mtrace命令：

yum install glibc-utils

2. 示例代码：

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
/* mtrace 头文件 */
#include <mcheck.h>

int main(int argc, char *argv[])
{
　　　　 /* 设置环境变量, mtrace保存位置 */
        setenv("MALLOC_TRACE", "mtrace_output.txt", 1);
        mtrace();   /* 打开 */

        char *buff = NULL;
        int size = 128;

        buff = malloc(size);

        if (NULL == buff)
                return -1;

        memset(buff, 0, size);
        sprintf(buff, "hello, world.");

        printf("malloc buff:%s\n", buff);

        if (argc > 1)
        {
                printf("free buff.\n");
                free(buff);
        }

        muntrace();  /* 关闭 */
        return 0;
}

3. 编译运行和检查结果

[root@localhost test]# gcc -g mtrace.c -o mtrace_test
[root@localhost test]# ./mtrace_test
malloc buff:hello, world.
[root@localhost test]# mtrace mtrace_test mtrace_output.txt

Memory not freed:
-----------------
          Address    Size    Caller
0x0000000001e435c0    0x80  at /root/test/mtrace.c:15
[root@localhost test]# 
[root@localhost test]# ./mtrace_test 123
malloc buff:hello, world.
free buff.
[root@localhost test]# mtrace mtrace_test mtrace_output.txt
No memory leaks.
[root@localhost test]#