Date: Mon, 8 Sep 2008 13:04:15 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: vehemens <vehemens@verizon.net> Cc: freebsd-current@freebsd.org Subject: Re: bsd versus linux device drivers Message-ID: <20080908100415.GI2038@deviant.kiev.zoral.com.ua> In-Reply-To: <200809080202.00664.vehemens@verizon.net> References: <200809080202.00664.vehemens@verizon.net>
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On Mon, Sep 08, 2008 at 02:02:00AM -0700, vehemens wrote:
> In linux drivers, there is a one to one relationship to an open and a cal=
ling=20
> argument structure called struct file. It provides a private data pointe=
r=20
> that allows the driver to preserve unique state information across other=
=20
> calls such as read/write/ioctl/mmap/close etc.
>=20
> For bsd drivers, my understanding there is not an equivalent. As a resul=
t it=20
> is not possible to preserve different state information for multiple open=
s by=20
> the same thread of the same device major/minor #'s.
>=20
> Is this correct, or did i miss something?
There is devfs_{get,set}_cdevpriv() KPI. Still no manpage, I shall fix
this ASAP.
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