Description:
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This bug is very specific to Windows.  When executing a generic file upload using PHP, if at anytime while the file is being uploaded Apache then runs a CGI script like PERL or a C program, and the upload ends while the CGI script is still running, the uploaded file(s) in the temp directory will remain behind forever.

In order to avoid this the “php_do_open_temporary_file” routine will have to not use the “VCWD_OPEN_MODE” routine to open the temp file.  A generic Windows “open” call allows child processes to inherit their handles.  The temp file would need to be opened with a “CreateFile” call to open the file and specify the pSecurityAttributes option with bInheritHandle set to FALSE so that a child process will not inherit the open file handle.  The rub is this call uses a non-compatible handle so everyone who uses this handle has to be modified as well.



Test script:
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Write or use any simple PHP upload program.  Next use CGI program below -- it doesn't need to do anything except take time.  So start the PHP upload, then start the CGI program below from a webpage.  Make sure the PHP upload completes before the script ends.


#include <windows.h>

void main(){
  Sleep(2*60*1000);	// sleep 2 minutes
}

Expected result:
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The file should be uploaded and the temp file in the temp directory should not be present when done.  It should be moved to the destination directory.

Actual result:
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The temp file remains forever in the temp directory, though the file is copied correctly to the destination directory.