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Re: poll() on fifo read descriptor with non-zero timeout ==> segfault
- From: Christopher Faylor <cgf-use-the-mailinglist-please at cygwin dot com>
- To: cygwin at cygwin dot com
- Date: Tue, 9 Feb 2010 11:34:46 -0500
- Subject: Re: poll() on fifo read descriptor with non-zero timeout ==> segfault
- References: <4B6E470D.firstname.lastname@example.org> <20100209085426.GW28659@calimero.vinschen.de>
- Reply-to: cygwin at cygwin dot com
On Tue, Feb 09, 2010 at 09:54:26AM +0100, Corinna Vinschen wrote:
>On Feb 6 20:52, Steven Monai wrote:
>> Hi folks,
>> Here is a short test case I've named "fifo-read.c":
>> Here's what happens at the command line:
>> $ uname -a
>> CYGWIN_NT-5.1 lonestar 1.7.1(0.218/5/3) 2009-12-07 11:48 i686 Cygwin
>> $ gcc-4 -Wall -Werror -ansi -pedantic -o fifo-read fifo-read.c
>> $ mkfifo -m0600 myfifo
>> $ ls -l
>> total 29
>> -rw-r--r--+ 1 steve None 939 2010-02-06 20:25 fifo-read.c
>> -rwxr-xr-x+ 1 steve None 22792 2010-02-06 20:25 fifo-read.exe
>> prw------- 1 steve None 0 2010-02-06 20:25 myfifo
>> $ ./fifo-read
>> About to enter poll()
>> Segmentation fault (core dumped)
>> If I change the timeout to a positive number, it also segfaults.
>> If I change the timeout to zero, it works, but poll() returns
>> immediately with no descriptor ready to read. Not very useful.
>> I get identical results on two different machines, with two different
>> OSes (XP and 2000). Can anyone else reproduce this? Am I using poll()
>Can you check with the latest snapshot from http://cygwin.com/snapshots,
>please? I can not reproduce the above crash with your test application
>when using Cygwin from CVS, neither on XP, nor on Windows 7.
Bottom line: The crash is fixed but cygwin still doesn't work right.
Problem reports: http://cygwin.com/problems.html
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