08-02-2010
how to write data into a device file?
Hi,
I am working in device drivers. I am new to device drivers. i have invoked chardev.c.
the driver is insmoded. now i want to write something into this and i want to look what i have written. but i don't know how to write and see. please help me
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dlb(7) Miscellaneous Information Manual dlb(7)
NAME
dlb, dlpi - STREAMS pseudodevice driver for bridging BSD Drivers to STREAMS
SYNOPSIS
#include <sys/dlpihdr.h>
#include <fcntl.h>
fd = open ("/dev/streams/dlb", O_RDWR, 0);
DESCRIPTION
The dlb STREAMS pseudodevice driver provides a communication path between BSD-style device drivers and STREAMS protocol stacks. The dlb
STREAMS pseudodevice driver is the Stream end in a Stream that communicates with BSD-based device drivers.
When the /dev/streams/dlb character device is open, a Stream is constructed between a Stream head and the dlb pseudodevice driver. After
the Stream that is intended to communicate with the BSD-based driver or drivers is created, the protocol module or modules can be pushed
onto it.
Tru64 UNIX supports a subset of the Data Link Provider Interface (DLPI) connectionless mode of communication. The attach DLPI primitive is
required to associate a particular physical point of attachment (PPA) with a Stream in Tru64 UNIX's implementation of the style 2 provider.
On the write side, the dlb pseudodevice driver translates connectionless style 2 DLPI messages to the appropriate BSD ifnet interface mes-
sages. On the read side, the user-bound Service Access Point (SAP) messages received from a selected PPA over BSD based driver or drivers
are sent upstream.
RELATED INFORMATION
Network Programmer's Guide
specification in /usr/share/doclib/dlpi/dlpi.ps delim off
dlb(7)