linux c程序內存泄漏檢測工具-mtrace工具介紹
阿新 • • 發佈:2018-07-01
std mac res AR urn %s \n 執行命令 check
筆者也是最近去面試被問到怎麽做內存泄漏檢查,之前都是靠人工屏蔽代碼、或者PC-link/KW一類的檢查工具進行檢查,回來後搜索了下,才知道linux自帶的就有mtrace工具。
具體操作步驟如下:
1.在linux下創建test.c文件,編寫如下代碼:
1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <string.h> 4 5 #include <mcheck.h> 6 7 8 int main() 9 { 10setenv("MALLOC_TRACE","malloc.log",1); 11 mtrace(); 12 13 14 char* text = (char*)malloc(sizeof(char)*100); 15 memset(text,0,100); 16 memcpy(text,"hello,world!",12); 17 printf("%s\n",text); 18 return 0; 19 }
2.保存退出後用,gcc -g text.c -o test.out進行編譯;
3.執行./test.out
4.執行命令mtrace test.out malloc.log,2-4步驟的結果如下
wqb@wqb-virtual-machine:~$ gcc -g test.c -o test.out wqb@wqb-virtual-machine:~$ ./test.out hello,world! wqb@wqb-virtual-machine:~$ mtrace test.out malloc.log - 0x0000000000700010 Free 4 was never alloc‘d 0x7fc09fee4e9d - 0x0000000000700210 Free 5 was never alloc‘d 0x7fc09ffaf91f - 0x0000000000700230 Free 6 was never alloc‘d 0x7fc0a001f23c Memory not freed:----------------- Address Size Caller 0x00000000007006a0 0x64 at /home/wqb/test.c:14 wqb@wqb-virtual-machine:~$
其中0x00000000007006a0 0x64 at /home/wqb/test.c:14 表明test.c的14行有內存泄漏。
linux c程序內存泄漏檢測工具-mtrace工具介紹