ntwk programming execution problem

[visham]

Hi to all,

To the forum admin: i'm having problems with my previous account "vishamr2000". I can't post msg with it. It says "not enough privilege...". Can you fix it? Itried to reach u via email but was unsuccessful. The message got truncated each time. Thx in advance..


Now i'm trying myself at network programming and I encountered the following problems:

1) When you have a main program that requires arguments, how do I execute it? For example:

int main (int argc, char *argv[])
{
...

if (argc != 3) {
	fprintf(stderr,"usage: tcpcli <IPaddress> <file pathname>");
	exit(1);
}
...
}

I compiled the program file like this:

gcc myClient.c -o myClient

I ran it like this:

myClient 192.168.10.20 love.txt

I got the following error:

bash: myClient: command not found

and in this way as well:

./myClient 192.168.10.20 love.txt

I got the following error:

Segmentation fault

2)In Beej's guide to Network Programming, when we have to loop several times in order receive several packets and read them, he talked about circular

buffers. How do we implement that?

if ((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) == -1) {
	perror("recv");
	exit(1);
}
buf[numbytes] = ’\0’;
printf("Received: %s",buf);

This is the part that is to be looped..How can I do it?


Any help, pointers will be most appreciated...

Warm regards,
Visham

[robatino]

1) You've made at least two typos (the command you typed couldn't have started with gcc, and the name of the command that bash couldn't find would have to be the same as the one you typed, so if you used "myClient" it wouldn't have said "myClient1 not found") but I'm guessing that the problem is that your current directory is not in your path. Try typing "./myClient 192.168.10.20 love.txt" instead of "myClient 192.168.10.20 love.txt" (assuming the name of your executable is myClient).

[visham]

Dear Robatino,

you're right..i made in a few mistakes in the post...i have edited the post to correct them. I had tried the way u told me but the same error appeared.
How do I correct it if, as you say, there were a path problem?

Warm regards,
Visham

[robatino]

The gcc command should put the executable in the current directory. Are you trying to run it from the same shell, or a different one which may be in a different directory? If all else fails, try finding the exact full path of the executable and type out the whole path - for example if the full path is /home/visham/myClient, try

/home/visham/myClient 192.168.10.20 love.txt

[visham]

Hi again,

To robatino: many thx for your replies...much appreciated

There was a problem in the C program itself that caused the "./myClient 192.168.10.20 love.txt" to not work...I've corrected the program and now it's working.

However, I don't know how to go about the second problem..Does anyone have program that contains this continuous receiving of packets?

Warm regards,
Visham