[Bug 3019] New: read error on reading from rtlinux FIFO from wine

Wine Bugs wine-bugs at winehq.org
Tue May 31 07:50:37 CDT 2005


           Summary: read error on reading from rtlinux FIFO from wine
           Product: Wine
           Version: 20050310
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wine-kernel
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: ad at trapdoor.de

i'm using wine to access a realtime application from a windows program by 
reading and writing to realtime FIFOs (/dev/rtf*). I used an old system where 
it worked fine for me (linux 2.4.19, RTL 3.2pre1, wine 20020804). After I 
changed to a new System (linux 2.4.29, RTL 3.2rc1, wine 20050310) read 
operations to these FIFOs failed. The windows program and the 
realtime-application are the same as before and still run on the old system.  
I compared the source-code of the rtlinux FIFO libraries of both versions and 
found out, that they are almost equal excepting some cosmetic stuff. 
I did the same read operations on normal files and on some other device files 
(e.g. /dev/random). This worked as expected. Reading from the FIFO from a 
native linux program also works without problems. 
The windows program was compiled with a german version of Developer 
Studio .NET. The source code i used for testing looks as follows: 
                        char inbuffer[32]; 
                        int result; 
                        CStdioFile cCmdFifo; 
                        cCmdFifo.Open("W:\\rtf1", CFile::modeWrite); 
                        AfxMessageBox("Send PING"); 
                        result=cCmdFifo.Open("W:\\rtf1", CFile::modeRead); 
                        cCmdFifo.ReadString(inbuffer, sizeof(inbuffer)); 
Drive W: is mapped to /dev and output of ls -la /dev/rtf1 looks like: 
crw-r--r--  1 root root 150, 1 2005-05-31 13:15 /dev/rtf1 
When cCmdFifo.Readstring is called the system hangs. The same happens when 
using cCmdFifo.Read instead. 
When calling the program with winedbg, the program still hangs. Pressing 
CTRL-C does not help getting more debugging information and I'm only able to 
exit the debugger by "quit" command (i'm not familar with using winedbg :-( ).  
I was not able to compile the old wine version on the new system, so I have no 
information whether this version works on this system or not.

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