02-08-2004
programming advice needed....
i'm a grad student taking a UNIX course and a networks course (i have a background in C++ and JAVA). i'm trying to combine the two classes.
My questions stems from a networks programming homework assignment below:
"Using the operating system and language of your choice, develop a program to set and monitor a serial interface. Display the interface status at the start of the program. Initialize the interface (DTR, RTS, 8 data bits, no parity, 19,200 bps). Report all interface status changes."
first question:
I want to try this on Linux RedHat (newbie)....can this program be done using shell commands (bash or korn)? Or are those too 'low-level' and i should write it in JAVA on the linux machine?
second question:
once i do start the programming (regardless of language)....if i compile and run it on the RedHat linux machine any idea whether i can connect serial ports (RJ-11 connection) to a computer running Windows XP Pro and not have any interference with the different OSs?
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LEARN ABOUT SUSE
ldattach
LDATTACH(8) Linux Programmer's Manual LDATTACH(8)
NAME
ldattach - attach a line discipline to a serial line
SYNOPSIS
ldattach [-dhV78neo12] [-s speed] ldisc device
DESCRIPTION
The ldattach daemon opens the specified device file (which should refer to a serial device) and attaches the line discipline ldisc to it
for processing of the sent and/or received data. It then goes into the background keeping the device open so that the line discipline
stays loaded.
The line discipline ldisc may be specified either by name or by number.
In order to detach the line discipline, kill(1) the ldattach process.
With no arguments, ldattach prints usage information.
LINE DISCIPLINES
Depending on the kernel release, the following line disciplines are supported:
TTY(0) The default line discipline, providing transparent operation (raw mode) as well as the habitual terminal line editing capabilities
(cooked mode).
SLIP(1)
Serial Line IP (SLIP) protocol processor for transmitting TCP/IP packets over serial lines.
MOUSE(2)
Device driver for RS232 connected pointing devices (serial mice).
PPP(3) Point to Point Protocol (PPP) processor for transmitting network packets over serial lines.
STRIP(4)
AX25(5)
X25(6) Line driver for transmitting X.25 packets over asynchronous serial lines.
6PACK(7)
R3964(9)
Driver for Simatic R3964 module.
IRDA(11)
Linux IrDa (infrared data transmission) driver - see http://irda.sourceforge.net/
HDLC(13)
Synchronous HDLC driver.
SYNC_PPP(14)
Synchronous PPP driver.
HCI(15)
Bluetooth HCI UART driver.
GIGASET_M101(16)
Driver for Siemens Gigaset M101 serial DECT adapter.
PPS(18)
Driver for serial line Pulse Per Second (PPS) source.
OPTIONS
-d | --debug
Causes ldattach to stay in the foreground so that it can be interrupted or debugged, and to print verbose messages about its
progress to the standard error output.
-h | --help
Prints a usage message and exits.
-V | --version
Prints the program version.
-s value | --speed value
Set the speed of the serial line to the specified value.
-7 | --sevenbits
Sets the character size of the serial line to 7 bits.
-8 | --eightbits
Sets the character size of the serial line to 8 bits.
-n | --noparity
Sets the parity of the serial line to none.
-e | --evenparity
Sets the parity of the serial line to even.
-o | --oddparity
Sets the parity of the serial line to odd.
-1 | --onestopbit
Sets the number of stop bits of the serial line to one.
-2 | --twostopbits
Sets the number of stop bits of the serial line to two.
SEE ALSO
inputattach(1), ttys(4)
AUTHOR
Tilman Schmidt (tilman@imap.cc)
AVAILABILITY
The ldattach command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
Linux 2.6 14 January 2008 LDATTACH(8)