From: tobias@gambas-buch.de (Tobias Boege)
To: kernelnewbies@lists.kernelnewbies.org
Subject: Regarding ioctl()
Date: Thu, 27 Dec 2012 12:13:45 +0100 [thread overview]
Message-ID: <20121227111345.GC663@aurora> (raw)
In-Reply-To: <CA+NV+V=5PCJqL47XArNV8RZYBdW--R3mhnPLfNKpG5usE4tmdQ@mail.gmail.com>
On Thu, 27 Dec 2012, Rahul Bedarkar wrote:
> Hi,
>
> When ioctl() is called from user space, how device driver related to it
> comes into picture ? What is flow from user space to kernel space ?
>
You may want to just follow the calls down from the syscall handler in
fs/ioctl.c. For special devices and non-handled ioctls you will end up in
vfs_ioctl() which calls the ->f_op->unlocked_ioctl() method of the backing
struct file defined in the driver, supposedly.
Regards,
Tobi
prev parent reply other threads:[~2012-12-27 11:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-27 10:30 Regarding ioctl() Rahul Bedarkar
2012-12-27 11:13 ` Tobias Boege [this message]
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