UDP - Revision history

Jcowdy at 18:45, 17 June 2011

2011-06-17T18:45:07Z

Jcowdy: Replaced content with '== Resources == XINU implements UDP as per RFC 768'

2011-06-13T21:47:17Z

Replaced content with '== Resources == XINU implements UDP as per RFC 768'

Jcowdy at 18:31, 10 June 2011

2011-06-10T18:31:46Z

Jcowdy: Created page with '== Sending data over UDP == '''Step 1: Allocate a new UDP device.''' :Use udpAlloc to get a device number for a udp device. If allocation fails, the device number returned will ...'

2011-06-10T18:29:49Z

Created page with '== Sending data over UDP == '''Step 1: Allocate a new UDP device.''' :Use udpAlloc to get a device number for a udp device. If allocation fails, the device number returned will ...'

New page

== Sending data over UDP ==

'''Step 1: Allocate a new UDP device.'''
:Use udpAlloc to get a device number for a udp device. If allocation fails, the device number returned will be SYSERR.
dev = tcpAlloc())

'''Step 2: Get the local ip address'''
:Use netLookup to find our local ip address.
:If interface is NULL, then we don't have a valid network interface.
This usually happens when a user forgets to run the netup command.

interface = netLookup((ethertab[0].dev)->num);
localhost = &(interface->ip);

'''Step3: Open the UDP device'''
:To open the device simply call open( ) with the following arguments:

#The UDP device number
#Our local ip address
#The destination's ip address
#The local port to use
#The remote port to connect to

open(dev, localIP, dstIP, localPort, remotePort)

Again if open fails, SYSERR is returned.

'''Step 4: Send the packet'''
:To actually send the data, use write( ) with the device, buffer, and length arguments.
:The actual data you want to send will be written to the buffer. The length arg is the length of the buffer.
write(dev, buf, MSG_MAX_LEN)

As usual, write returns SYSERR if it fails.

'''Step 5: Close the connection'''
:Once the device is finish being used, be responsible and call close to return the device.
close(dev);

← Older revision		Revision as of 18:45, 17 June 2011
Line 1:		Line 1:
	== Resources ==		== Resources ==
	XINU implements UDP as per RFC 768		XINU implements UDP as per RFC 768
		+
		+
		+	== Debugging ==
		+	To enable UDP debugging, uncomment the following line in include/udp.h
		+	//#define TRACE_UDP TTY1
		+
		+	In order to see the trace results you open another console to the second serial port using the router name followed by the number 2.
		+	mips-console router2
		+	Alternatively TTY1 can be changed to TTY0 resulting in the trace printing on the main console.

← Older revision		Revision as of 21:47, 13 June 2011
Line 1:		Line 1:
−	== ~~About~~ ==	+	== Resources ==
	XINU implements UDP as per RFC 768		XINU implements UDP as per RFC 768
−
−	~~== Sending data over UDP ==~~
−
−	~~'''Step 1: Allocate a new UDP device.'''~~
−	~~:Use udpAlloc to get a device number for a udp device. If allocation fails, the device number returned will be SYSERR.~~
−	~~dev = tcpAlloc())~~
−
−	~~'''Step 2: Get the local ip address'''~~
−	~~:Use netLookup to find our local ip address.~~
−	~~:If interface is NULL, then we don't have a valid network interface.~~
−	~~This usually happens when a user forgets to run the netup command.~~
−
−	~~interface = netLookup((ethertab[0].dev)->num);~~
−	~~localhost = &(interface->ip);~~
−
−	~~'''Step3: Open the UDP device'''~~
−	~~:To open the device simply call open( ) with the following arguments:~~
−
−	~~#The UDP device number~~
−	~~#Our local ip address~~
−	~~#The destination's ip address~~
−	~~#The local port to use~~
−	~~#The remote port to connect to~~
−
−	~~open(dev, localIP, dstIP, localPort, remotePort)~~
−
−	~~Again if open fails, SYSERR is returned.~~
−
−
−	~~'''Step 4: Send the packet'''~~
−	~~:To actually send the data, use write( ) with the device, buffer, and length arguments.~~
−	~~:The actual data you want to send will be written to the buffer. The length arg is the length of the buffer.~~
−	~~write(dev, buf, MSG_MAX_LEN)~~
−
−	~~As usual, write returns SYSERR if it fails.~~
−
−	~~'''Step 5: Close the connection'''~~
−	~~:Once the device is finish being used, be responsible and call close to return the device.~~
−	~~close(dev);~~

← Older revision		Revision as of 18:31, 10 June 2011
Line 1:		Line 1:
		+	== About ==
		+	XINU implements UDP as per RFC 768
		+
	== Sending data over UDP ==		== Sending data over UDP ==