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In std C89 can you suggest me where to sei KeepAlive ?
In what primitive? Socket ? send ? recv ? And about timing value ?

I'm referencing to this one sockaddr_in

Why it has been implemented a structure to contain af_family, port and ip address ?

Ok thank you.
I thought this behaviour of KeepAlive could to be useful only to prevent some application states before send/recv was used. what do you think ?

What is reason to put data (ip, port) into structure of sockaddr to use connect primitive or bind ?
It could to be easier to pass as single parameters (ip or ports) instead to pass the structure ?...

I'm writing network app client/server with tcp persistent connection. If network went down, both client and server socket are kept opened, they are not closed automatically. So how can I prevent this...

If I want to write code for C89 It's necessary to use fflush(stdout) during message print to output ?
E.g. with printf("message") .

Lets' suppose to convert int type from host byte order to network byte order to send data to another host and I want to use htonl function.
Host byte order depends on computer architecture...

On the same machine I created client and server application where client always starts communication and open socket to server on port 2001.
Netstat shows:

1) tcp 0 0 0.0.0.0:2001 ...

In code when you use exit() instruction to close process, It's good practise close sockets or files and deallocate data structure before invoke exit(). I thought when process is auto-destroyed this...

I noted select return 1 when remote process is receiving ctrl-c while I thought it received -1 value.
I create server process where stdin and communication sockets are inserted into fd_set to...

In network where process C is client and another one S is server,
C is waiting network message or user input by select function, idem S.

If I kill process A, RECV of server S receives -1 value...

It's very interesting what you are saying: for some reason, it calls send() several times
so It's possible for few byte for some reason bytes can to be sent/recevived in multiple call so It's...

But this behaviour depends of how application Is made, according to your example programmer decides how to send data:
programmer can decide to send "AB"or "ABC" on 1st SEND , so RECV will ...

if you run man recv in return value section says:

On success, a file descriptor for the new socket is returned. On error, -1 is returned, and errno is set to indicate the error

My environment is Ubuntu OS and compiler is gcc

Let's suppose programmer doesn't know buffer size and It's need to send 8192 Bytes, how programmer should have to set cycle to send data by TCP socket ? I think by multiple blocks of data sending......

TCP

How you suggested, It likes there is limit to send bytes in a single task ? What is maximum size of buffer to receive / send data at one time ?

I'd like to know if return code test of recv function in my C application, according to std c89, is right.


While (1) {
...
ret = recv(socket, buffer, lun, 0);

if ( ret == -1 ||...

If I had these 2 module :
utility.c + utility.h (linked list functions)
server.c + server.h

every .header file contains declaration of functions plus data structure because I want to isolate...

thanks to all.
I need to understand and your confirm helped me.

I thank you very much for your code but my target is understand C code which I indicated, even if this doesn't work.
Please help to understand the following lines and afterwards I'll be able to...

I know infact I copied string into another one as job string. Same thing for every line (which is tokenized) is copied to another one for extracting words.

It's true only if you use 2nd strtok with NULL as 1st parameter that is strtok(NULL,delimiter); I know strtok has no state.
In my case strtok is run as It was always the first time with...

I read several documents about strtok according to C89/90, that is my target.
I want to use only strtok and I need to divide string into lines by '#' delimiter and line into words by ';' delimiter....

I have 4 module.c (a,b,c,d,) and 2 ( a, b) of them share a data structure so I think to declare the data structure into a header file which will be referenced both into a and into b module.
It's...