I am new in client server programming and i have written code for single server to single client communicating one port(3490). but i have no idea how my single server will be communicate with different client on different port.how this will be happen ?
Any idea to understand the logic or send any good link or any piece of code in c , i searched on net but all help was mostly for java progamming.
I have question about the UNIX sockets. my goal is to connect multiple sockets from a single client to a single server and keep them open...I'm not sure if that is possible to create or not. Do you have any suggestion or an example of code?
View 1 Replies View RelatedI have written a server application which has select for both incoming new client connection requests and incoming data from client. I am able to process incoming connection requests and client data.
For example, server has 8 clients connected to it. If client 3 disconnects from server, how will server come to know this client has disconnected and to close its client socket fd gracefully? Does server's select get data on that client socket fd as 'close' data or any error code in recv() function that notifies server to close this client socket fd? Also if client disconnects abruptly without sending close request to server, how should server handle this? Does server get "EPIPE" error?
My senior project team at Penn State is starting to write our code, and I was looking for a revision control system to manage it. I was going to use CVS, but I can't find a client that doesn't have to install something on the local machine(we dont have administrative permissions on school computers). Is there a CVS(or Subversion or anything else) client that comes as a single executable file or web interface?
View 3 Replies View RelatedIs it possible to handle multiple signals in just one handler? I only know singal() catches one signal at a time
View 2 Replies View RelatedI have a huge binary log file. There are lets say 4 id's that I want to find in a log file. I know that those 4 id's will be present in the log file and I also know in what order they will be present. I want to find 1st id from the log then 2nd id and then third id and so on..
Simple/inefficient solution is: Loop through the id's and then grep in the log file. Problem with this solution is for each id grep will search from the beginning of the file.
Better/efficient solution would be: Sine I know the order in which id's will be present in the log file. Loop through id's, grep 1st id and then move on to grep 2nd id and so on...this way I can grep all id's in one pass. Is this solution possible ?
I have 500000 + values to find in log files and I have to find efficient solution for it.
In my production setup, i have 3 servers using the same mount point. However, i see that the IOPS is low. Does this kind of architecture have any impact on IOPS. In case it is neutral, how can i tune my setup for better IOPS.
View 1 Replies View RelatedWe can add multiple IP address on a single NIC. Is there any limitation that is how many ip address I can add on a single NIC card??
View 1 Replies View RelatedHave this script which is reading in a series of files, one at a time with while-do-done loop, each file goes through various greps/awk's where this info is then saved to various files for later use. i.e....
Script is being run on Linux Red Hat,
In one of the grep/awk's the output (currently) are 2 columns (min max), i.e....| awk '{print $1, $2}' | sort -u which outputs (e.g.)
The number of "min max" pairs varies from file to file. Want to output a single column of unique numbers from the min max pairs & get the number of them for input to a file...i.e...
Where <PROCESS> is some process/technique that will generate a single column of integers (increment of 1) to pipe into the next one (sort -u)
i.e. (example from above)
Have tried command seq - only works for single pair input i.e.
Is there any command like seq etc which will output a single column based on a input of min max numbers (increment 1) to pipe onwards to next command?
have a look at the following thread story and please clear my doubt.
View 6 Replies View RelatedWe have too many audio Paths, for each user have one. We would like to create a unique folder to Read in network.
For example:
The idea is Mapping all folders to the path /pub/Music in server, so all user can access all music online in the server.
Very Well. How we can do it?
And when pc1 and pc2 have the same subfolder, like Beatles, and in the subfolder have different folders ( PC1-Beatles/Revolver ) (PC2-Beatles/Habbey_Road) or The same folder (PC1-Beatles/The_Mistery_Magic_Tour) (PC3-Beatles/The_Mistery_Magic_Tour)...
Is there a way to contemplate this issue?
How to run multiple X server in single terminal in linux .Is it possible .
View 3 Replies View RelatedI am looking at setting up a multiple postfix SMTP servers for a single domain. Below is my requirement, I would appreciate if someone out there could guide me to achieve this using postfix..
1. Want to setup 2 postfix SMTP Server with 1 POP3 Server.
2. Server1 will host POP3 & SMTP services for domain "metallica.one".(IP: 1.1.1.1, MX: mx1.metallica.one)
3. Server2 will host only SMTP services for domain "metallica.one" (IP: 1.1.1.2, MX: mx2.metallica.one)
4. Server1 & Server2 will be used as load balancing for sending mails. (either manual settings in email client, or auto-loadbalancing is still preferred).
5. Mail received for domain metallica.one on Server2 should be pushed/forwarded/relayed to Server1 where POP3 services are running.
6. Outgoing mails for other domains from Server2 should be sent directly to the other-domain-recipients without relaying to Server1.
I have configured a file server with samba and winbind in RHEL5.I am able to allot permission for the active directory groups to my Linux folder.No issues.But i want to set multiple groups of active directory to get ownership to a single directory. Say there are 3 groups a,b,c to have permissions to a folder of the Linux machine.
Code:
chown -R root:Active_directory_group_name path_to_linux directory
I have set
Code:
chmod 770 /myshare
meaning that user and group would have full rights to /myshare
Code:
chown root:a
works great I tried with the option of
Code:
chown -R --reference=/etc/shares_own.txt /myshare
In reference file(shares_own.txt) i gave the entry as
Code:
root:a,b,c
This is not working.
Our system uses email to send fairly time-sensitive status messages between programs running on various servers on a WAN. Each email message is sent to two addresses (different servers). The problem occurs when one of the destination mail servers is off the network. I think because it's trying to send one email to two addresses, sendmail attempts delivery to the first address, then to the second address (i.e., serially). When this happens, it hangs for two connect timeout (CONNECT_TO) periods trying to connect to the offline destination, then after the timeout, it then delivers to the other destination. I'm trying to figure out how to work around that connection delay so it doesn't delay delivery to the other destination.
I'm working with the network guys to enable the right ICMP messages that signal when a network is unavailable, but I would also like to try having sendmail split the emails into two envelopes, then use parallel, independent connections for delivery.
After days of reading through the docs (O'Rielly Sendmail book + sendmail docs) I think one way to do this is to use multiple mail queues, but I can't decipher exactly how to do that from the docs.
There might be other, more elegant ways to do the same thing, but again, trying to decipher the docs has my head swimming. (This is my first experience with sendmail.)
I currently am running 10.04.1 and have successfully setup my home web server to run a single website. My current settings are:
-I have registered the domain name annarrankings.com through godaddy
-A record is - host = @ and points to = 71.114.220.3
-CName is - host = www and points to = @
-on my server I have the site running in /var/www
I've done some research and found that to run multiple websites I need to setup VirtualHost.
-So I created a folder /var/www/annarrankings.com and moved my site to that folder
-Edited Apache2.conf to add the following line
-I then went to /etc/apache2/sites-enabled and copied the default file to a new file called annarrankings.com. Here's the annarrankings.com file after I edited it
-I then created a link in /etc/apache2/sites-enabled to the annarrankings.com file in /etc/apache2/sites-available
-Next I editied /etc/hosts
-When i went to enable the site using a2ensite annarrankings.com I got the following
I figured this was ok since I had already created a symbolic link earlier (a result of trying to following multiple tutorials and ..... videos at once) so I reloaded apache2. I created an index.html file in /var/www/ just for testing purposes and when I load www.annarrankings.com I get the file located in /var/www/ instead of the website located in /var/www/annarrankings.com Do I need to change my A record or CName in godaddy or did I just do this completely wrong?
A simple TCP based chat server could allow users to use any TCP client (telnet, for example) to communicate with each other. For this question you should consider a single process, single thread server that can support exactly 2 clients at once, the server simply forwards whatever is sent from one client to the other (in both directions). Your server must not insist on any specific ordering of messages as soon as something is sent from one client it is immediately forwarded to the other client. As soon as either client terminates the connection the server can exit
View 4 Replies View RelatedIs there any limitation to the number of transactions through a single port if so then if we assign multiple port to that particular service then the performance is increased (what i suppose)
so: Is there any way to assign multiple Ports to a single service. like for a web server the main service is httpd or some thing like that to be running on the server and now if we assign multiple ports to that service then the performance increases.
How to login multiple client pc on the same network using via openvpn server from client side
View 1 Replies View RelatedIf i have two domins [URL] and [URL], can i point it to same IP Address in DNS?.I had already added namevirtualhost in my Apache.If possible, is there any risk,disadvantages.
View 11 Replies View RelatedI need to transpose a file with over a 1000 rows of 5 columns of numbers into a file with a single column of numbers. The numbers are separated by a single space and range from one digit to 5 digits each. I tried using awk, but can only get it to grab one column of numbers.
Input:
1 2 3 4 50
600 7 8 9000 10
11 12000 13 14 15
Desired output:
1
2
3
4
[code]....
Tried using: awk '{split($0,a,""); print $NF}' <filename> and got:
50
10
15
It only grabbed the last number in each row.
I'm calling a function defined in "uart.c" from "main.c"
But on "make" using cygwin bash, it's giving an error:"Unreferenced function"...
Pls help me to overcome this problem.
If i'm putting the definition of that function in "main.c" itself, its working.
So pls tell me how to write the make file for it?
Possible Duplicates: Dual Booting Linux and Windows XP Booting Multiple Operating Systems I have a machine with Windows on it, and I would like to be able to reboot to Linux. I am certain this is possible. How can I achieve this?
View 2 Replies View RelatedI have an unencrypted DVD that is one big title, ie you cannot skip next / prev. What I want to do is reauthor the DVD with title at certain points, so that I can skip next / prev when watching it.
I'm using Ubuntu 8.10
i have 30 linux PCs running. i need to check the performance of all pcs( memory,ram and process usage) in single command or in GUI mode.In solaris we have perf script to check performance in GUI mode. i need same type in linux?
View 1 Replies View Relatedhow to update a series of values from multiple grep commands outputs to be appended to a single row of a csv file? Work on a linux envir. The values from grep output will be numeric values.
Output sold look like:
1,3,4,5,7,0,5
Each of these values will be odtained from multiple grep commands piped with wc -l Is it possible to update a single row of a csv file if so pleas ehelp me with the command to be used to redirect the output into the csv file
I want to do something like svn add dir1 dir2; svn ci dir1 dir2 but have it be only 1 revision. Is there a way to do this? Is this the correct way to add new folders (with contents) to the repository? We are restructuring the trunk, so I cleared it out and plan on putting these directories with their contents in it.
View 1 Replies View RelatedI've written a script (that doesn't work) that looks something like this:
#!/bin/sh
screen -dmS "somename" somecommand
for i in {0..5}; do
screen -dmS "name$i" anothercommand $i
done
For some reason, if I copy and paste this into a terminal, it creates 7 detached screen sessions as I expect. If I run it from within a script, however, I get only the first session, "somename," when I run screen -ls.
Edit: If the same can be accomplished another way (e.g. with multiple screen windows instead of sessions), I would be open those solutions as well.
How can I configure a single computer to work for multiple simultaneous users? I would like to have multiple keyboards and monitors on a single PC ... Is it possible? This set up I'm planning for CyberCafe, For cyberCafe business ROI is very slow... so was planning to have something like this....
-single CPU (Which would act as a server)
-Multiple monitors, keyboards, Headphones etc....
If this works out then I would save a lot on my investments (OS cost, Hardware devices, electricity etc)
I am using Xfce as the desktop enviroment and Mozilla Firefox as the webrowser. Within the webrowser window, I do File>Save Page As. I save it, and the result is almost always foo.html and directory foo_files. But I think under KDE I could choose the format, one of them being something like "Single page" (only one file; the colecction of .png, etc is embedded into that file). And this is the format I want Xfce (or Firefox) to use when downloading to hdd.
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