New subject: [Bug 26876] special file CON not handled correctly

21 Apr 2011


      http://bugs.winehq.org/show_bug.cgi?id=26876
Summary: special file CON not handled correctly
           Product: Wine
           Version: 1.3.15
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: shell32
        AssignedTo: wine-bugs@winehq.org
        ReportedBy: stefankriwanek@gmx.net
Created an attachment (id=34269)
 --> (http://bugs.winehq.org/attachment.cgi?id=34269)
test binary
In some applications, it is desirable to temporarily redirect stdout/stderr to
a file, and then switch back to the console output. This can be accomplished
using the special file "CON", as stated at
http://support.microsoft.com/kb/58667/en-us
Wine seems not to handle this as windows does:
To reproduce, please compile the following C source or run the attached binary:
#include <stdio.h>
#include <errno.h>
int main() {
        errno=0;
        fopen("CON", "w" );
        printf("errno: %u\n", errno); errno=0;
freopen("CON", "w", stdout );
        printf("errno: %u\n", errno); errno=0;
freopen("CON", "w", stderr );
        printf("errno: %u\n", errno);
}
On native Windows, this outputs 'errno: 0' into the terminal three times.
On wine, it outputs 'errno: 13' (=EACCESS, permission denied) after the first
fopen. The further two output lines get lost. They're not written to named file
"CON" either.
I set the severity to normal, since I don't know another way of accessing the
console attached to the program, if stdout/stderr were redirected. Also this
might affect any SDL program, as re-redirection to the console is recommended
there (http://sdl.beuc.net/sdl.wiki/FAQ_Console). (Running SDL apps through
wine is convenient during development)
Note:
For SDL programs, however, the redirection of stdout and stderr to files can be
disabled in the first place by setting the environment variable
'SDL_STDIO_REDIRECT' to '0'.
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[Bug 26876] New: special file CON not handled correctly