I am using valgrind for the first time in linux
运行可执行文件时收到以下消息。
==31440==
==31440== FILE DESCRIPTORS: 3 open at exit.
==31440== Open file descriptor 2: /dev/pts/9
==31440== <inherited from parent>
==31440==
==31440== Open file descriptor 1: /dev/pts/9
==31440== <inherited from parent>
==31440==
==31440== Open file descriptor 0: /dev/pts/9
==31440== <inherited from parent>
==31440==
==31440==
==31440== HEAP SUMMARY:
==31440== in use at exit: 72,704 bytes in 1 blocks
==31440== total heap usage: 40 allocs, 39 frees, 91,192 bytes allocated
==31440==
==31440== 72,704 bytes in 1 blocks are still reachable in loss record 1 of 1
==31440== at 0x4C277AB: malloc (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==31440== by 0x4EC3AAF: _GLOBAL__sub_I_eh_alloc.cc (eh_alloc.cc:117)
==31440== by 0x400E859: call_init.part.0 (in /lib64/ld-2.18.so)
==31440== by 0x400E942: _dl_init (in /lib64/ld-2.18.so)
==31440== by 0x40011C9: ??? (in /lib64/ld-2.18.so)
==31440==
==31440== LEAK SUMMARY:
==31440== definitely lost: 0 bytes in 0 blocks
==31440== indirectly lost: 0 bytes in 0 blocks
==31440== possibly lost: 0 bytes in 0 blocks
==31440== still reachable: 72,704 bytes in 1 blocks
==31440== suppressed: 0 bytes in 0 blocks
==31440==
==31440== For counts of detected and suppressed errors, rerun with: -v
==31440== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 2 from 2)
这是否意味着我有内存泄漏?我怎么知道是否有内存泄漏。 你们中的任何人都可以建议我如何使用valgrind并解释错误。提前谢谢。
答案 0 :(得分:1)
首先,如果您在C中有泄漏,则意味着您执行了malloc,但是您没有释放它。使用man malloc
和man free
获取更多信息。
我可以在您启动Valgrind
时给您一个提示,您可以使用参数--leak-check=full
,它会告诉您哪些malloc没有免费。
例如:
$>valgrind --leak-check=full ./foo.
答案 1 :(得分:0)
如果您的程序有内存泄漏,它将在LEAK SUMMARY中指定有多少行存在内存泄漏。
definitely lost: x bytes in 0 blocks
indirectly lost: y bytes in 0 blocks
您可以通过创建&#34;类obj = new class()&#34;来运行快速测试。在不删除obj的情况下,您肯定会在项目中创建内存泄漏。