在Linux平台中调试C/C++内存泄漏方法 (腾讯和MTK面试的时候问到的)

 

#include <string.h>
#include <stdlib.h>
int LeakTest(char * Para)
{
if(NULL==Para){
//local_log(“LeakTest Func: empty parameter/n”);
return -1;
}
char * Logmsg = new char[128];
if(NULL == Logmsg){
//local_log(“memeory allocation failed/n”);
return -2;
}
sprintf(Logmsg,”LeakTest routine exit: ‘%s’./n”, Para);
//local_log(Logmsg);
return 0;
}
int main(int argc,char **argv )
{
char szInit [] = “testcase1”;
LeakTest(szInit);
return 0;
}

Linux x86 (glibc 2.2.4)

Linux s390/s390x (glibc 2.3.3 or higher)

Linux (PowerPC, USS) (glibc 2.3.2 or higher)

AIX (4.3.2+)

Window2000 以上

^
BEAM_VERSION=3.4.2
BEAM_ROOT=/home/hanzb/memdetect
BEAM_DIRECTORY_WRITE_INNOCENTS=
BEAM_DIRECTORY_WRITE_ERRORS=
— ERROR23(heap_memory) /*memory leak*/ >>>ERROR23_LeakTest_7b00071dc5cbb458
“code2.cpp”, line 24: memory leak
ONE POSSIBLE PATH LEADING TO THE ERROR:
“code2.cpp”, line 22: allocating using `operator new[]’ (this memory will not be freed)
“code2.cpp”, line 22: assigning into `Logmsg’
“code2.cpp”, line 24: deallocating `Logmsg’ because exiting its scope (losing last pointer to the memory)
— ERROR1 /*uninitialized*/ >>>ERROR1_foo_60c7889b2b608
“code2.cpp”, line 16: uninitialized `c’
ONE POSSIBLE PATH LEADING TO THE ERROR:
“code2.cpp”, line 10: allocating `c’
“code2.cpp”, line 13: the if-condition is false
“code2.cpp”, line 16: getting the value of `c’
VALUES AT THE END OF THE PATH:
p != 0 — ERROR2 /*operating on NULL*/ >>>ERROR2_foo_af57809a2b615
“code2.cpp”, line 17: invalid operation involving NULL pointer
ONE POSSIBLE PATH LEADING TO THE ERROR:
“code2.cpp”, line 13: the if-condition is true (used as evidence that error is possible)
“code2.cpp”, line 16: the if-condition is true
“code2.cpp”, line 17: invalid operation `[]’ involving NULL pointer `p’
VALUES AT THE END OF THE PATH:
c = 1 p = 0 a <= 0

 

 

读写已经释放的内存

读写内存块越界（从前或者从后）

使用还未初始化的变量

将无意义的参数传递给系统调用

内存泄漏

 

如果我在此介绍的三款工具你都不喜欢，那也没有关系，可在下面站点中找到很多检测内存错误的工具：http://www.sslug.dk /emailarkiv/bog/2001_08/msg00030.html。此外，还有一些商业工具，比如Purify、Geodesic等。在此就 不详细介绍。

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