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Full Discussion: Message queues
Top Forums Programming Message queues Post 71888 by mgchato on Monday 16th of May 2005 10:34:01 PM
Old 05-16-2005
I'm supposed to write a set of programs that allow users logged on to a host to send messages to each other.

At first, I should start with this messenger program I'm telling you about and add to it a coordination program. Since the coordinator should accept messages from the clients and forward them to all attached clients, I think that the answer to your question is that there will be more than 2 processes communicating between each other.

THANX!!!
 

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LEARN ABOUT XFREE86

rpc.nfsd

rpc.nfsd(8)						      System Manager's Manual						       rpc.nfsd(8)

NAME

       rpc.nfsd - NFS server process

SYNOPSIS

       /usr/sbin/rpc.nfsd [options] nproc

DESCRIPTION

       The  rpc.nfsd  program  implements the user level part of the NFS service. The main functionality is handled by the nfsd kernel module. The
       user space program merely specifies what sort of sockets the kernel service should listen on, what NFS versions it should support, and  how
       many kernel threads it should use.

       The rpc.mountd server provides an ancillary service needed to satisfy mount requests by NFS clients.

OPTIONS

       -d  or  --debug
	      enable logging of debugging messages

       -H  or  --host hostname
	      specify  a  particular hostname (or address) that NFS requests will be accepted on. By default, rpc.nfsd will accept NFS requests on
	      all known network addresses.  Note that lockd (which performs file locking services for NFS) may still accept request on	all  known
	      network addresses.  This may change in future releases of the Linux Kernel.

       -p  or  --port port
	      specify a diferent port to listen on for NFS requests. By default, rpc.nfsd will listen on port 2049.

       -N  or  --no-nfs-version vers
	      This option can be used to request that rpc.nfsd does not offer certain versions of NFS. The current version of rpc.nfsd can support
	      both NFS version 2,3 and the newer version 4.

       -s  or  --syslog
	      By default, rpc.nfsd logs error messages (and debug messages, if enabled) to stderr. This option makes rpc.nfsd log  these  messages
	      to syslog instead. Note that errors encountered during option processing will still be logged to stderr regardless of this option.

       -T  or  --no-tcp
	      Disable rpc.nfsd from accepting TCP connections from clients.

       -U  or  --no-udp
	      Disable rpc.nfsd from accepting UDP connections from clients.

       nproc  specify  the  number of NFS server threads. By default, just one thread is started. However, for optimum performance several threads
	      should be used. The actual figure depends on the number of and the work load created by the NFS clients, but a useful starting point
	      is 8 threads. Effects of modifying that number can be checked using the nfsstat(8) program.

       Note  that  if  the NFS server is already running, then the options for specifying host, port, and protocol will be ignored.  The number of
       processes given will be the only option considered, and the number of active nfsd processes will be increased or decreased  to  match  this
       number.	In particular rpc.nfsd 0 will stop all threads and thus close any open connections.

NOTES

       If  the	program  is  built with TI-RPC support, it will enable any protocol and address family combinations that are marked visible in the
       netconfig database.

SEE ALSO

       rpc.mountd(8), exports(5), exportfs(8), rpc.rquotad(8), nfsstat(8), netconfig(5).

AUTHOR

       Olaf Kirch, Bill Hawes, H. J. Lu, G. Allan Morris III, and a host of others.

								    7 Aug 2006							       rpc.nfsd(8)
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