Alternative network messaging? Post: 302721601

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Top Forums Shell Programming and Scripting Alternative network messaging? Post 302721601 by DGPickett on Thursday 25th of October 2012 02:53:23 PM

10-25-2012

Registered User

Yes, kill is named for it's most popular use, termination, but it is just a signal sender.

in shell, trap is the shell signal catcher. SIGINT was available, but for apps SIGUSR1 and SIGUSR2 are most appropriate: Man Page for signal (linux Section 7) - The UNIX and Linux Forums

The signal processing is done out of sequence with the process thread(s), but in the same process so variables are passed.

So, you can push files to input-dir/unique.take-me-extension, the final step being mv and then kill to start the possibly, usually sleeping server so it processes the input.(

Code:

ssh server_host 'cat >input-dir/unique.take-me-extension.tmp
  mv input-dir/unique.take-me-extension.tmp input-dir/unique.take-me-extension
  kill -SIGUSR1 `< server-pid-file`
 ' < input-file

Of course, you have to be the same id or root to signal a process. Named pipes can stall servers that only require the writer have permission on the pipe.

Code:

$ mknod p p
$ ls -lA|grep '^p'
prw-r--r--   1 my_uid    my_group          0 Oct 25 14:54 p
$ while :
do
 cat <p
done &
[1]     19299
$ echo hi >p
$ hi
echo hello >p
$ hello

Last edited by DGPickett; 10-25-2012 at 04:01 PM..

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dfstab

dfstab(4)							   File Formats 							 dfstab(4)

NAME

       dfstab - file containing commands for sharing resources across a network

DESCRIPTION

       dfstab  resides	in  directory /etc/dfs and contains commands for sharing resources across a network. dfstab gives a system administrator a
       uniform method of controlling the automatic sharing of local resources.

       Each line of the dfstab file consists of a share(1M) command. The dfstab file can be read by the  shell	to  share  all	resources.  System
       administrators can also prepare their own shell scripts to execute particular lines from dfstab.

       The contents of dfstab put into effect when the command shown below is run. See svcadm(1M).

	 /usr/sbin/svcadm enable network/nfs/server

SEE ALSO

       share(1M), shareall(1M), sharemgr(1M), svcadm(1M)

NOTES

       Do  not modify this file directly. This file is reconstructed and only maintained for backwards compatibility. Configuration lines could be
       lost.

       Use the sharemgr(1M) command for all share management.

SunOS 5.11							    15 Aug 2008 							 dfstab(4)