Very Computer

How to send EOF using socket connection? I have try "\n", "\r\n" and
"\0" but all don't work.

I can assume that you are sending text files. EOF is usually indicated
by -1 or ^D.
EOF is defined in stdio.h

you can append EOF to a string by doing the following

char eof;

eof = (char) EOF;
/* explicitly append the eof to the string */
string[sizeof(string) ] = eof;
/* explicitly null terminate the string */
string[sizeof(string) + 1] = '\0';

/* This code should work */
send( socket_descriptor, string, sizeof(string), 0);

John

According to ANSI, EOF is defined as a negative integral constant.
Usually it's defined as -1, obviously.  It's never defined as 4.

Quote:> char eof;

> eof = (char) EOF;

EOF expands to a negative int.  (char) EOF will almost certainly give
you a different constant, since sizeof(char) < sizeof(int) on most
systems.

Quote:> /* explicitly append the eof to the string */
> string[sizeof(string) ] = eof;

But you won't be appending an end-of-file, because EOF is not a char.
Not to mention the fact that EOF as an end-of-file marker is something
used by stdio, not by the physical media which are being used.

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Then how can I tell the server that I have sent all data, if all data is a
unknown length string. Any special character should I append at the end of
that string?

yes, you'll have to do this yourself in the protocol.

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Such as prefacing each 'send' with an integer containing the length of
the packet... and when you're done... send an extra packet containing a
length of -1...

The receiver, recv()'s the socket for the length of an integer to find out
how much it should read (if at all) on a second recv().

Just an idea...

-tony
--

Quote:>Then how can I tell the server that I have sent all data, if all data is a
>unknown length string. Any special character should I append at the end of
>that string?

shutdown(socket_fd, 1);

is how you indicate that you're done sending data on that connection, but
still plan on reading from it.

If you're not going to read any more, either, just call close().

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Why not use non-blocking read(); and if you get EAGAIN there is no more
data (Well, there might be some left but you can use a select loop to
timeout and maybe do something like:

if (*ptr != '\0') then continue_parsing

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Use close() resp. shutdown() on the socket.

Wolfgang

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