Mail Archives: cygwin/2001/07/20/12:17:39
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On Fri, Jul 20, 2001 at 09:20:08AM -0400, Ed Bradford wrote:
>The following program (stdio.c):
>
>#include <windows.h>
>#include <stdio.h>
>main()
>{
> char buf[128];
>
> while(gets(buf)) {
> printf("%s\n",buf);
> if(buf[0] == 'q')
> break;
> }
> return 0;
>}
>
>just echos what is typed in and loops. If you enter a 'q' it exits.
>
>It behaves strangely when executed from bash. Here is my experiment:
>
>F:\egb\src\cyg>cl stdio.c
>Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8168 for 80x86
>Copyright (C) Microsoft Corp 1984-1998. All rights reserved.
>
>stdio.c
>Microsoft (R) Incremental Linker Version 6.00.8168
>Copyright (C) Microsoft Corp 1992-1998. All rights reserved.
>
>/out:stdio.exe
>stdio.obj
>
>F:\egb\src\cyg>
>
>The "stdio.c" program is compiled using Microsoft cl.exe -- not gcc.
>
>Running it from cmd.exe produces the expected results. Each line is printed after the return is typed.
>Running it from bash produces a buffered output. Entering two lines produces no output. A third line of 'q' produces
>the first two lines, the q and the program exits. Running cmd.exe from bash and then the stdio program still produces the
>buffered output problem.
>
>What is Bash or CYGWIN.dll doing with the CreateProcess API to cause this behavior in a program that has no connections
>to CYGWIN.dll?
>
>I uncovered this while writing a book that strongly recommends CYGWIN. I have much more complicated programs that
>don't work when executed from bash/cygwin.dll. This is the simplest I could produce.
>
>I ran setup today and upgraded everything before I wrote and demonstrated the problem.
>Attached below is the output from "cygcheck -s > chycheck.out".
>
>(See attached file: cygcheck.out)
>
>Ed Bradford
>
>
>Your Windows 2000 Arborist and Linux Performance Comparisonist
>T/L 589-4410; Outside: 1-919-993-4410
>egb AT us DOT ibm DOT com
--
cgf AT cygnus DOT com Red Hat, Inc.
http://sources.redhat.com/ http://www.redhat.com/
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