Date: Mon, 10 Aug 2009 18:09:35 -0700 (PDT)
From: Michelle Li <michelle_li_001@yahoo.com>
To: freebsd-hackers@freebsd.org
Subject: device drivers (Krassimir Slavchev) REPLY fd = open("/dev/xxx0", O_RDWR)
Message-ID: <884424.91640.qm@web65411.mail.ac4.yahoo.com>
In-Reply-To: <20090810120020.1A75610656BC@hub.freebsd.org>
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Hello Krassimir~ open() fails with [ENXIO]...or other? Please advise~ Regards m_li --- On Mon, 8/10/09, freebsd-hackers-request@freebsd.org <freebsd-hackers-r= equest@freebsd.org> wrote: From: freebsd-hackers-request@freebsd.org <freebsd-hackers-request@freebsd.= org> Subject: freebsd-hackers Digest, Vol 333, Issue 1 To: freebsd-hackers@freebsd.org Date: Monday, August 10, 2009, 8:00 AM Send freebsd-hackers mailing list submissions to =A0=A0=A0 freebsd-hackers@freebsd.org To subscribe or unsubscribe via the World Wide Web, visit =A0=A0=A0 http://lists.freebsd.org/mailman/listinfo/freebsd-hackers or, via email, send a message with subject or body 'help' to =A0=A0=A0 freebsd-hackers-request@freebsd.org You can reach the person managing the list at =A0=A0=A0 freebsd-hackers-owner@freebsd.org When replying, please edit your Subject line so it is more specific than "Re: Contents of freebsd-hackers digest..." Today's Topics: =A0=A0=A01. Help with device drivers (Krassimir Slavchev) ---------------------------------------------------------------------- Message: 1 Date: Mon, 10 Aug 2009 14:39:31 +0300 From: Krassimir Slavchev <krassi@bulinfo.net> Subject: Help with device drivers To: freebsd-hackers@freebsd.org Message-ID: <4A8006F3.5020800@bulinfo.net> Content-Type: text/plain; charset=3DISO-8859-1 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi All, Looking at sys/dev/usb/misc/ufm.c ... static int ufm_open(struct usb_fifo *dev, int fflags) { =A0 =A0 =A0 =A0 if ((fflags & (FWRITE | FREAD)) !=3D (FWRITE | FREAD)) { =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 return (EACCES); =A0 =A0 =A0 =A0 } =A0 =A0 =A0 =A0 return (0); } ... and sys/dev/usb/storage/urio.c ... static int urio_open(struct usb_fifo *fifo, int fflags) { =A0 =A0 =A0 =A0 struct urio_softc *sc =3D usb_fifo_softc(fifo); =A0 =A0 =A0 =A0 if ((fflags & (FWRITE | FREAD)) !=3D (FWRITE | FREAD)) { =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 return (EACCES); =A0 =A0 =A0 =A0 } ... If I try to open the device from userland with: fd =3D open("/dev/xxx0", O_RDWR) it fails because open() tries to open the device for reading first and then for writing. Do I use the wrong function to open such devices? Best Regards -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFKgAbyxJBWvpalMpkRAt2ZAKCWfTWtaCu+1Xcf70Z9RM3+peZJ/ACgof4q ybg2Mu3tDnz6Jwc1MA/Zwzs=3D =3DUsso -----END PGP SIGNATURE----- ------------------------------ _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" End of freebsd-hackers Digest, Vol 333, Issue 1 *********************************************** =0A=0A=0A
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