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Special Forums IP Networking A Basic example of socket programming in C Post 302999240 by yifangt on Thursday 15th of June 2017 05:30:09 PM
Old 06-15-2017
A Basic example of socket programming in C

Hello,
I have a question about socket programming
The question was a homework of this university of past (2011?) course.
The server is simulating a sensor that provides readings of temperature, light and humidity (temp.dat, light.dat, humid.dat) each with single column of number, one per row.
Code:
temp.dat:
60
59
58
57
......
light.dat:
40
50
20
30
......
humid.dat:
1
2
3
4
......

The server will open each file, read in all sensor values, and serve every request from the client. If a client requests temperature, the server will return a certain temperature sample from temp.dat according to the time of the connection. Starting from the first value of temp.dat when a connection is established, every second the server should return the next value in temp.dat upon request. If EOF is reached, the server should wraps around and start from the beginning of the file again. Display readings to the screen:
Code:
Connected to server!
Data returned by the server:
TEMPERATURE = 60 HUMIDITY = 40 LIGHT = 1
Data returned by the server:
TEMPERATURE = 59 HUMIDITY = 50 LIGHT = 2
Data returned by the server:
TEMPERATURE = 58 HUMIDITY = 20 LIGHT = 3
......  ......  ......

I have attached the code in C for server and client parts, but I am quite obscure about reading the 3 files in the server side and display in the client side by request.
This is NOT my homework for any class, but for self study to understand basic server-client communication of socket programming in C.

Any suggestion is greatly appreciated and pseudo code is fine.

Thanks a lot!
 

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dtest(1)							   USER COMMANDS							  dtest(1)

NAME
dtest - simple uDAPL send/receive and RDMA test SYNOPSIS
dtest [-P provider] [-b buf size] [-B burst count][-v] [-c] [-p] [-d] [-s] dtest [-P provider] [-b buf size] [-B burst count][-v] [-c] [-p] [-d] [-h HOSTNAME] DESCRIPTION
dtest is a simple test used to exercise and verify the uDAPL interfaces. At least two instantiations of the test must be run. One acts as the server and the other the client. The server side of the test, once invoked listens for connection requests, until timing out or killed. Upon receipt of a cd connection request, the connection is established, the server and client sides exchange information necessary to per- form RDMA writes and reads. OPTIONS
-P=PROVIDER use PROVIDER to specify uDAPL interface using /etc/dat.conf (default OpenIB-cma) -b=BUFFER_SIZE use buffer size BUFFER_SIZE for RDMA(default 64) -B=BURST_COUNT use busrt count BURST_COUNT for interations (default 10) -v, verbose output(default off) -c, use consumer notification events (default off) -p, use polling (default wait for event) -d, delay in seconds before close (default off) -s, run as server (default - run as server) -h=HOSTNAME use HOSTNAME to specify server hostname or IP address (default - none) EXAMPLES
dtest -P OpenIB-cma -v -s Starts a server process with debug verbosity using provider OpenIB-cma. dtest -P OpenIB-cma -h server1-ib0 Starts a client process, using OpenIB-cma provider to connect to hostname server1-ib0. SEE ALSO
dapltest(1) AUTHORS
Arlin Davis <ardavis@ichips.intel.com> BUGS
uDAPL 1.2 February 23, 2007 dtest(1)
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