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Programming
Automatic port selection using C in Linux?
Post 302490918 by dsw on Wednesday 26th of January 2011 06:21:14 AM
01-26-2011
What's create()? The irony of including the "e" ... 
Your question is not clear to me - do you wish to discern which port is available on the local box (server) so that you can bind() and listen() on that particular port, *or* do you wish to know on the client which port can be used for bi-directional communication to the server (this port will be chosen automatically if you specify 0 for sin_port, and it will be used for *outgoing* packets unless you are going to listen() on that port).
Probably best to post what you have written so far.
Your question is not clear to me - do you wish to discern which port is available on the local box (server) so that you can bind() and listen() on that particular port, *or* do you wish to know on the client which port can be used for bi-directional communication to the server (this port will be chosen automatically if you specify 0 for sin_port, and it will be used for *outgoing* packets unless you are going to listen() on that port).
Probably best to post what you have written so far.
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LEARN ABOUT OSF1
snmp_traprcv
snmp_traprcv(8) System Manager's Manual snmp_traprcv(8) NAME
snmp_traprcv - A program that listens for SNMP trap messages and prints any it receives SYNOPSIS
/usr/sbin/snmp_traprcv [-d] [-tcp] [-p port] OPTIONS
Sends a hexadecimal dump of the received packet to stdout. Specifies that the TCP transport be used instead of the UDP transport. If a connection cannot be established, the program silently receives the trap on the standard transport address (UDP 162). Specifies the port number on the local host on which to listen to messages. The default is 162, the well-known SNMP trap port. DESCRIPTION
The snmp_traprcv program listens on the SNMP Trap port specified in the /etc/services file. If no entry exists in the /etc/services file, the program listens on port 162. If any SNMP trap messages arrive, snmp_traprcv prints them to stdout. The program runs until terminated by typing Ctrl/c. RESTRICTIONS
When using the default or well-known port, you must have root privileges in order to run this program. The program may not be able to bind to the default or specified port if other software on the system is already bound to that port. SEE ALSO
Commands: snmpd(8), snmp_request(8), snmp_trapsnd(8) snmp_traprcv(8)