07-18-2019
/var/run/ is supposed to be writable and volatile: to be cleaned during system boot, or an in-memory file system (e.g. tmpfs).
The daemon process should create the pidfile, and remove it when it is killed, in an exit handler that captures all kill signals. (Please do not kill -9 the daemon process!)
Further, an init script can check for an existing pidfile, if yes then check for validity and refuse to start a second daemon process. If the daemon-process runs as non-root, the init script creates a subdirectory and chowns it to the daemon user.
AIX generates random and big (7 or 8 digits) pids.
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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)