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Subject:	Re: mkstemp bug
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Reply-To:	sds AT gnu DOT org
X-Attribution:	Sam
X-Disclaimer:	You should not expect anyone to agree with me.
From:	Sam Steingold <sds AT gnu DOT org>
In-Reply-To:	<20050427222031.GB24021@trixie.casa.cgf.cx> (Christopher Faylor's message of "Wed, 27 Apr 2005 18:20:31 -0400")
References:	<usm1cb0aa DOT fsf AT gnu DOT org> <u8y33c1ta DOT fsf AT gnu DOT org> <20050427222031 DOT GB24021 AT trixie DOT casa DOT cgf DOT cx>
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Date:	Wed, 27 Apr 2005 19:39:37 -0400
Message-ID:	<u4qdrbxhi.fsf@gnu.org>
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> * Christopher Faylor <pts-ab-crefbany-ercyl-cyrnfr AT pltjva DOT pbz> [2005-04-27 18:20:31 -0400]:
>
> On Wed, Apr 27, 2005 at 06:06:09PM -0400, Sam Steingold wrote:
>>> * Sam Steingold <fqf AT tah DOT bet> [2005-04-27 13:24:29 -0400]:
>>>
>>> it appears that mkstemp() returns a temp FD pointing to the same file:
>>> mkstemp ("/tmp/clisp-x-io-XXXXXX");
>>> ==> "/tmp/clisp-x-io-000592"
>>> mkstemp ("/tmp/clisp-x-io-XXXXXX");
>>> ==> "/tmp/clisp-x-io-000592"
>>> mkstemp ("/tmp/clisp-x-io-XXXXXX");
>>> ==> "/tmp/clisp-x-io-000592"
>>
>>this is note quite as easy to reproduce.  sorry.
>>
>>the problem is that mkstemp() does not regard FIFOs (as created by
>>mkfifo() or mknod()) as existing files.
>>
>>e.g.
>>
>>  char s1[] = "/tmp/foo-XXXXXX";
>>  char s2[] = "/tmp/foo-XXXXXX";
>>  int fd = mkstemp(s1);
>>  close(fd); remove(s1);
>>  mkfifo(s1,0644);
>>  mkstemp(s2);
>>  strcmp(s1,s2) ===> 0
>
> fifos just barely work under cygwin.  I wouldn't recommend using them.

Yes, it appears that they are heavily broken. Try
mkfifo foo
xterm -e 'tty >> foo; cat foo'
(now foo can be used by other tty application to communicate with the
user via the dedicated xterm - works in linux but not cygwin).

nevertheless, mkstemp() breakage is also a problem here.


thanks for your reply.


-- 
Sam Steingold (http://www.podval.org/~sds) running w2k
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