New subject: [Bug 21291] System call "dup2" doesn't retain text vs binary mode

Jan. 9, 2010

      http://bugs.winehq.org/show_bug.cgi?id=21291

           Summary: System call "dup2" doesn't retain text vs binary mode
           Product: Wine
           Version: 1.0.1
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: msvcrt
        AssignedTo: wine-bugs(a)winehq.org
        ReportedBy: simon(a)josefsson.org

Hi again, here is another "dup2" problem.

The attached code example behaves different in Wine compared to Windows XP. 
Under Wine it will print:

is_mode 1
dup2 3 => 0
is_mode 0

Note the last 'is_mode 0' which is the actual error.  On Windows XP it prints:

is_mode 1
dup2 3 => 0
is_mode 1

The bug in the Wine "dup2" implementation appears to be that it doesn't copy
the text/binary setting to the new file descriptor.  Fixing it may be rather
simple.

/Simon

jas(a)mocca:~$ cat foo2.c
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>

#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
/* Get declarations of the Win32 API functions.  */
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
#endif

/* Return non-zero if FD is open in the given MODE, which is either
   O_TEXT or O_BINARY.  */
static int
is_mode (int fd, int mode)
{
  int value = setmode (fd, O_BINARY);
  setmode (fd, value);
  return mode == value;
}

int
main (void)
{
  const char *file = "test-dup2.tmp";
  int fd = open (file, O_CREAT | O_TRUNC | O_RDWR, 0600);

  setmode (fd, O_TEXT);
  printf ("is_mode %d\n", is_mode (fd, O_TEXT));
  printf ("dup2 %d => %d\n", fd, dup2 (fd, fd + 1));
  printf ("is_mode %d\n", is_mode (fd + 1, O_TEXT));

  return 0;
}
jas(a)mocca:~$ i586-mingw32msvc-gcc -o foo2.exe foo2.c
jas(a)mocca:~$ wine --version
wine-1.0.1
jas(a)mocca:~$ wine ./foo2.exe
is_mode 1
dup2 3 => 0
is_mode 0
jas(a)mocca:~$

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[Bug 21291] New: System call "dup2" doesn't retain text vs binary mode

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