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Full Discussion: read/write socket error
Top Forums Programming read/write socket error Post 302113706 by gio on Monday 9th of April 2007 09:31:31 AM
Old 04-09-2007
read/write socket error
I have client and server connected.
client write and read from csock.
server write and read from ssock
suppose the server does :
....
close(ssock); //send FIN to client
othertask();
....

READ ERROR


if after the server close() the client does:
...
read(csock,...);
...
read(csock,...);
...
close(csock,...);
...
read(csock,...);
...


first read return 0 (read FIN)


second read also return 0.


third read return -1 with errno set to EBADF.


QUESTION 1:
Indeed if after the server close() the client does:
....
write(csock, "hello", 6); //server send RST
...
read(csock,...);
...
write(csock, ...);


first write return 6 without signaling nothing.


read return:
0 if the client read before the RST arrives.
-1 with errno set to ECONNRESET otherwise.


second write comports the SIGPIPE signal.
if it is ignored write return -1 and errno=EPIPE, otherwise it
comports the client termination.
is ok?


IS THE SITUATION THE SAME WHEN THE SERVER CRASH BEFORE THE CLIENT'S
FIRST WRITE?


QUESTION 2:
when read fails with errno=ENOTCONN?


QUESTION 3:
In general if I don't set the timeout option, is possible that a
read() fails with errno=ETIMEDOUT?


WRITE ERROR


when write fails and errno =ECONNRESET??
 

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LEARN ABOUT DEBIAN

shevek_server_connection

shevek::server< client, serverdata >::connection(3)	     Library Functions Manual	       shevek::server< client, serverdata >::connection(3)

NAME

       shevek::server< client, serverdata >::connection -

       Base of the client class which is implemented by the calling program.

SYNOPSIS

       #include <server.hh>

       Inherits shevek::refbase.

   Public Member Functions
       void continue_reading ()
	   This is called after in->unread (), to resume accepting data from this connection.
       ~connection ()
	   Destructor.

   Public Attributes
       Glib::RefPtr< shevek::fd > in
	   The input socket. The client can stop reading from this connection by calling in->unread ().
       Glib::RefPtr< shevek::fd > out
	   The output socket. This is used to send data to the connection.

   Protected Member Functions
       connection ()
	   The client class can construct this object with its create function.
       Glib::RefPtr< server< client,
	   serverdata > > get_server ()"
	   Access to the server object which hosts this client.
       void disconnect ()
	   This can be called by the client object to close this connection.

   Friends
       class server< client, serverdata >

Detailed Description
   template<typename client, typename serverdata>struct shevek::server< client, serverdata >::connection
       Base of the client class which is implemented by the calling program.

       A client object is created for every connection which is accepted. This class handles server administration and provides access to members
       from the client class.

Author
       Generated automatically by Doxygen for libshevek from the source code.

libshevek							  Fri May 11 2012	       shevek::server< client, serverdata >::connection(3)
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