Solved

VC++ 6.0 : system() library call is leaking

Posted on 2006-06-15
4
859 Views
Last Modified: 2012-05-05
Hi,

sytem() library call caused 776 bytes memory leak.

Could u pls explain to delete this memory.

System is spawning a process to execute the given command .
The   CreateProcessW function from  kernel32.dll has allocated some memory from the heap which it has not deallocated. This seems to be causing the memory leak.
How do we get around this problem?
The following is the snapshot of Purify showing the leak.

-------------------------------------------------------------------------------
[W] MLK: Memory leak of 776 bytes from 2 blocks allocated in CreateProcessW [kernel32.dll]

    Allocation location
        RtlAllocateHeap [NTDLL.dll]
        CreateProcessW [kernel32.dll]
        dospawn        [dospawn.c:188]
                                                         NULL,
                                                         &StartupInfo,
                                                         &ProcessInformation
         =>                                            );
           
                    dosretval = GetLastError();
                    _free_crt( StartupInfo.lpReserved2 );
        comexecmd      [spawnve.c:122]
            #ifdef WPRFLAG
                    rc = _wdospawn(mode, name, argblk, envblk);
            #else  /* WPRFLAG */
         =>         rc = _dospawn(mode, name, argblk, envblk);
            #endif  /* WPRFLAG */
            #else  /* EXECVE */
            #ifdef WPRFLAG
        spawnve        [spawnve.c:260]
            #ifdef WPRFLAG
                                    rc = wcomexecmd(mode, pathname, argv, envp);
            #else  /* WPRFLAG */
         =>                         rc = comexecmd(mode, pathname, argv, envp);
            #endif  /* WPRFLAG */
           
            #else  /* EXECVE */
        system         [system.c:69]
           
                    if (argv[0])    /* Do not try to spawn the null string */
                            if ((catch = _tspawnve(_P_WAIT,argv[0],argv,NULL)) != -1
         =>                 || (errno != ENOENT && errno != EACCES))
                                    return(catch);
           
                    /* No COMSPEC so set argv[0] to what COMSPEC should be. */
       
         =>         i=system(pCopyFile);
                    if(0!=i)
-------------------------------------------------------------------------------
0
Comment
Question by:k_kalyan
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
4 Comments
 
LVL 86

Accepted Solution

by:
jkr earned 63 total points
ID: 16913517
>>       =>         i=system(pCopyFile);

If you want to copy a file, use 'CopyFile()', e.g.

CopyFile("c:\\tmp\\file1.txt","c:\\tmp\\file2.txt", FALSE);

BTW, Purify seems to be wrong about the error. Just examine 'dospawn.c'.
0
 
LVL 11

Assisted Solution

by:cup
cup earned 62 total points
ID: 17027241
Is it a one off leak or does it leak every time you call the routine?  Most systems have a one off leak that isn't worth bothering about because when the process is killed, the OS will get rid of it for you.
0

Featured Post

Secure Your Active Directory - April 20, 2017

Active Directory plays a critical role in your company’s IT infrastructure and keeping it secure in today’s hacker-infested world is a must.
Microsoft published 300+ pages of guidance, but who has the time, money, and resources to implement? Register now to find an easier way.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

What is C++ STL?: STL stands for Standard Template Library and is a part of standard C++ libraries. It contains many useful data structures (containers) and algorithms, which can spare you a lot of the time. Today we will look at the STL Vector. …
  Included as part of the C++ Standard Template Library (STL) is a collection of generic containers. Each of these containers serves a different purpose and has different pros and cons. It is often difficult to decide which container to use and …
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question