Are you talking about writing a program to monitor a FIFO pipe so the program will sleep untill another program activates the pipe then the first program will wake up and do it's bit ?
Here's a small C section to do that
It is used from one terminal as:
Quote:
redhead@sindre{56} ~/Programming> ./a.out &
[1] 5035
redhead@sindre{57} ~/Programming> cat my_fifo_fil
You woke me poking my fifo my_fifo_fil
Program Woken at: Tue Nov 10 17:38:40 2009
[1] Done ./a.out
I'm very new to unix. I need help in writing a shell script that will automatically take output file from a particular folder from a server and if the file is generated send email notifications to certain group of ppl and if it is not generated send a mail wid error msg..
can any1 help me on... (2 Replies)
I'm very new to unix. I need help in writing a shell script that will automatically take output file from a particular folder from a server and if the file is generated send email notifications to certain group of ppl and if it is not generated send a mail wid error msg..
can any1 help me on... (4 Replies)
I want to gzip a file and append the creation date to the end of the file. How can I accomplish this task. Basically they are log files which need a creation date stamp appended to make sure they do not overwrite other log files.
-jack (3 Replies)
Hi,
I am quite new to Perl scripting and i need to create a .TXT file using perl, with fields (A,B,C,D,E), and this text file should be named with current file creation date "XYZ_CCYYMMDD.TXT" (i.e.XYZ_2011042514:33 PM).
Can anyone who has done this, please share their expertise on this... (5 Replies)
I would like to know
Is it possible to get a notification as pop-up in linux
when a folder with extension '.aqs' written
a popup should come
as " The folder has been written "
Thank you in advance (5 Replies)
I need to get notification via email when the line containing a pattern is changed in a file. Not during the time any changes to file occurs. Ie if we reset a user password say example, demouser the hash in the line containing the word demouser in the file /etc/group changes. So when this change... (1 Reply)
hi,
I want to the AIX to check if file exist everyday and send me notification email.
I added this to the root file in /var/spool/cron/crontabs
0 10 * * * /usr/sendS40No.sh > /dev/null 2>&1
I tried also
0 10 * * * /usr/sendS40No.sh
and in the sendS40No.sh i wrote this
if
then
echo... (6 Replies)
Can someone help me with a shell script that will send an email to a set of email ids when a user id is created or deleted on AIX system.
Also, if the script can let the admin know when a particular user id's password will expire. (2 Replies)
Can someone help me with a shell script that will send an email to a set of email ids when a user id is created or deleted on AIX system.
Also, if the script can let the admin know when a particular user id's password will expire. (4 Replies)
Hello Folks,
I have an requirement, where i need to get total count of the file based on creation date with there filename selected pattern.
Filename: MobileProtocol.20171228T154200.157115.udr
I want to get the count of files created on each day based on a pattern find.
find . -type... (7 Replies)
Discussion started by: sadique.manzar
7 Replies
LEARN ABOUT X11R4
fifo
fifo(3tcl)fifo(3tcl)NAME
fifo - Create and manipulate u-turn fifo channels
SYNOPSIS
package require Tcl
package require memchan
fifo
DESCRIPTION
fifo creates a stream-oriented in-memory channel and returns its handle. There is no restriction on the ultimate size of the channel, it
will always grow as much as is necessary to accommodate the data written into it.
In contrast to the channels generated by memchan a channel created here effectively represents an U-turn. All data written into it
can be read out, but only in the same order. This also means that a fifo channel is not seekable.
The channels created here can be transferred between interpreters in the same thread and between threads, but only as a whole. It is
not possible to use them to create a bi- or unidirectional connection between two interpreters.
Memory channels created by fifo provide two read-only options which can be queried via the standard fconfigure command. These are
-length
The value of this option is the number of bytes currently stored in the queried memory channel.
-allocated
The value of this option is the number of bytes currently allocated by the queried memory channel. This number is at least as big as
the value of -length.
As the channels generated by fifo grow as necessary they are always writable. This means that a writable fileevent-handler will fire con-
tinuously.
The channels are also readable if they contain more than zero bytes. Under this conditions a readable fileevent-handler will fire continu-
ously.
NOTES
One possible application of memory channels created by memchan or fifo is as temporary storage device to collect data coming in over a pipe
or a socket. If part of the processing of the incoming data is to read and process header bytes or similar fifo are easier to use as they
do not require seeking back and forth to switch between the assimilation of headers at the beginning and writing new data at the end.
SEE ALSO
fifo2, memchan, null
KEYWORDS
channel, fifo, i/o, in-memory channel, memchan, stream
COPYRIGHT
Copyright (c) 1996-2003 Andreas Kupries <andreas_kupries@users.sourceforge.net>
Memory channels 2.1 fifo(3tcl)