Date: Mon, 20 Mar 2006 12:07:49 +0100 (CET) From: Volker Stolz <vs@FreeBSD.org> To: FreeBSD-gnats-submit@FreeBSD.org Subject: standards/94729: fcntl() throws undocumented ENOTTY Message-ID: <200603201107.k2KB7n5w011208@i2.informatik.rwth-aachen.de> Resent-Message-ID: <200603201110.k2KBAFZw086037@freefall.freebsd.org>
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>Number: 94729
>Category: standards
>Synopsis: fcntl() throws undocumented ENOTTY
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-standards
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Mar 20 11:10:15 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator: Volker Stolz
>Release: FreeBSD 6.1-BETA3 i386
>Organization:
Lehrstuhl für Informatik II; RWTH Aachen (c) Universität
>Environment:
System: FreeBSD menelaos.informatik.rwth-aachen.de 6.1-BETA3 FreeBSD 6.1-BETA3 #1: Mon Mar 13 10:45:03 CET 2006 root@menelaos.informatik.rwth-aachen.de:/usr/obj/usr/src/sys/MENELAOS i386
>Description:
When trying to set non-blocking IO on e.g. /dev/null, ENOTTY is returned.
This is neither documented in the FreeBSD man page nor behaviour covered by
IEEE Std 1003.1-2001.
>From browsing our bug-tracker, there seem to be several instances of third-party
software (mostly in ports) which required FreeBSD-specific patches.
I understand that the Posix-description doesn't give us an easy way out, but we should
at least document this in our own man page.
>How-To-Repeat:
Run the program below, redirecting input from /dev/null:
./a.out </dev/null
yikes!: Inappropriate ioctl for device
>Fix:
Unknown; should at least be documented.
Maybe setting O_NONBLOCK on /dev/null should not fail?
--- fcntltest.c begins here ---
#include <fcntl.h>
#include <stdio.h>
void main() {
if (fcntl(0,F_SETFL,O_NONBLOCK) != 0)
perror("yikes!");
return 0;
}
--- fcntltest.c ends here ---
>Release-Note:
>Audit-Trail:
>Unformatted:
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