Victor (and others):
I have completed my proposed patch to add some additional functionality to
rtf's with respect to querying their sizes/fills. Attached is the patch
.tar.gz (along with a readme). If this mailing list filters out
attachments, you can also download the patch at:
http://www.rtlab.org/patches/rtlinux-3.1_rtf_sizes_patch.tar.gz
Patch Synopsis:
RTF Get Sizes/Free/et al patch.. for the released version of rt-linux v3.1
RT-Linux Version:
rtlinux-3.1 (as distrubuted to the commmunity at large)
Author:
Calin A. Culianu ([EMAIL PROTECTED])
Description:
This patch is a proof of concept/feature request for the rt-linux team at
fsmlabs. I (and maybe some other people?) thought it would be useful if
an RTF were queryable from the kernel/userland with respect to buffer
size, current length, and bytes free. As such, three functions, two
ioctls, and 1 configure option were added.
Files modified were:
scripts/config.in -- added the configure option
CONFIG_RTF_EXTRA_QUERYABLE
doc/Configure.helpa -- added a description of the above option
include/rtl_fifo.h -- added function prototypes and some IOCTL constants
fifos/rtl_fifo.c -- added 3 functions: rtf_free(), rtf_bufsize(), and
rtf_length(). Also added two ioctls in the
rtf_ioctl() function (IOCTL_RTF_GET_BUFSIZE and
IOCTL_RTF_GET_FREE).
The code I added is small and reasonably well commented. I tried to
stick to the style of the existing code. I have tested this functionality
both from userland and kernel space and everything should be fine. I
also wrote the 3 functions to be SMP-safe (via judicious use of spin
locks).
This is also in conformance with existing code.
Please let me know if the patch is accepted, and thank you for your time!
-Calin
Patch rtlinux v3.1 to support some additional rtf funcs
