07-25-2011
There are ways to do this from the daemon:
1. write to a known memory location in a given process - like a message queue or shared memory.
2. write to a named pipe or to a given filename
The is nothing you can do in shell by itself; you have to seriously rewrite the daemon.
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LEARN ABOUT OSF1
writesrv
writesrv(8) System Manager's Manual writesrv(8)
NAME
writesrv - Lets users send messages to and receive messages from a remote system.
SYNOPSIS
/usr/sbin/writesrv
DESCRIPTION
The writesrv daemon allows users to send messages to users on a remote system, and to receive responses from users on a remote system with
the write command.
The writesrv command receives incoming requests from a write command and creates a server process to handle the request. This server
process communicates with the client process (write) and provides whatever services are requested.
To perform these services, the writesrv daemon creates a socket on the port defined in the /etc/services file. All requests for service go
as messages to this socket.
STARTING AND STOPPING writesrv.
You can cause the writesrv daemon to be started during system boot with /sbin/init.d/write. The writesrv daemon starts automatically if the
WRITESRV variable is defined properly in /etc/re.config. To start writesrv automatically during system boot, do the following as superuser.
rcmgr set WRITESRV yes
To prevent writesrv from starting automatically during system boot, do the following as superuser:
rcmgr set WRITESRV no
By default, writesrv is not set and therefore /usr/sbin/writesrv does not run.
You can start the writesrv daemon manually as follows:
/sbin/init.d/write start
You can stop writesrv manually as follows:
/sbin/init.d/write stop
NOTES
If the writesrv daemon terminates abnormally (that is, for a system crash, a power failure, or the kill -9 command), someone must manually
clean out the /usr/spool/writesrv directory to remove any files left behind.
RELATED INFORMATION
Commands: write(1)
Files: services(4) delim off
writesrv(8)