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09.20.2008 at 02:07PM PDT, ID: 23748649
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6.4

TCP/IP programming socket port doubts

Asked by dtivmk in TCP/IP, Linux, Linux Networking

In a simple client server code for TCP/IP:
server side :
int sock2 = accept(sock1,&client,&clength);

client side :
int sock1 = socket(AF_INET,SOCK_STREAM,0);
connect(sock1,&serv,sizeof(serv));
------------
value of sock1 at client side is 3,
and value of sock2 at server side is 4.
but ain't both the sockets same?
then what do these values denote?
--------
Secondly, on the server side I can print
the port number of the client by cli.sin_port.
From where does that port number come?
Who assigns that port number to the client?
Client machine itself? When does that assignment happen?
-------------------
I compiled my code like gcc -g filename, but could
not step into the functions like accept,connect,bind etc.\
with gdb.
What do I need to do in order to step inside these function
calls?
-----------------
Do I really need to typecast variables of type "struct sockaddr_in"
to "struct sockaddr"? Since my code compiles simply with a warning
and runs fine, if I don't do this typecasting.
-----------------
If I include only <arpa/inet.h> and no other header files,like <sys/socket.h>,
then my code doesn't even give a warning, if I don't do this typecasting.
In fact, if I pass
"serv" in place of "&serv", even then there is no error/warning while
compiling. But the code doesn't work. Why?Start Free Trial
 
Keywords: TCP/IP programming socket port doubts
Title
1 sizeof struct
2 TCP Sockets programming problem.
3 Structs & Sockets
4 socket write broken pipe
5 TCP Socket Client
6 Sockets Programming is gcc linux
 
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[+][-]09.20.2008 at 02:11PM PDT, ID: 22531644

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[+][-]09.20.2008 at 08:13PM PDT, ID: 22533063

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Solution Provided By: duncan_roe
Participating Experts: 1
Solution Grade: B
 
 
[+][-]09.20.2008 at 08:29PM PDT, ID: 22533117

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[+][-]09.21.2008 at 03:37AM PDT, ID: 22533941

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[+][-]09.25.2008 at 05:51AM PDT, ID: 22568461

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[+][-]09.25.2008 at 02:52PM PDT, ID: 22574276

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[+][-]09.27.2008 at 04:25AM PDT, ID: 22586291

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[+][-]09.27.2008 at 09:29AM PDT, ID: 22587685

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[+][-]09.28.2008 at 05:07AM PDT, ID: 22590653

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[+][-]09.28.2008 at 11:14AM PDT, ID: 22592041

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[+][-]09.28.2008 at 03:20PM PDT, ID: 22592786

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