C: Question about Beej's networking guide... Is there an assumption here? -


I was just going through the network through the networking guide and I'm curious about this part of the code (in particular "From here" "and" here "): 

  // (Main; loop; // for read_fds = master; copy it (if selected (FDMX + 1, and READ_FDS, NOUL, NOUL, NOUL) == -1 (Returns ("Select"); Exit (4);} // Run through the existing connection that searches for existing data (i = 0; i & lt; = fdmax; i ++) {if (FD_ISSET ( I, and read_fds)) {// We've got one !! if (i == listener) {// addrlen = sizeof remoteaddr; newfd = acceptable to add new connections (listener, (stroke, Socador *) and remoder , And Adrilon); if (newfd == -1) {false ("accept");} Other {FD_SET (newfd, & master); // Add to master set if (newfd> fdmax) {// max Keep track of fdmax = newfd; printf ("selectserver: new connection to% s on socket" socket% d \ n ", inet_ntop (remoteaddr.ss_family, get_in_addr (struct sockaddr *) and remander), remote, INET6_ADDRSTRLEN) , Newfd); }} Else {// handle the data from the client ----------------- From here ------------------ - ------ If ((nbytes = recv (i, buf, sizeof buf, 0)) & lt; = 0} {// got an error or closed connection by customer if (nbytes == 0) {// Connection closed printf ("selectserver: socket% d stolen \ n", i); } And {mirror ("RQ"); } Close (i); // Bye! FDCLR (I, and Master); // Remove from main set ----------------- Even here --------------------- - -----} else {// We got some data from a customer for (j = 0; j & lt; = fdmax; j ++) {// Send to everyone! If (J = Listener & amp; j! = I) {Send (J, Buff, NBAT, 0) == - (except listeners and themselves) (FD_ISST (J & M)) 1) { Mirror ("send"); }}}}}} / END handles the data from the client / / / END receives the new incoming connection} // END for looping through the file descriptor // End End (;;) - and you thought it will never end! Return 0;

Now I know that reading does not always read "everything" which is read on socket and it can sometimes only return one part of it. In that situation, will not this code be wrong? I mean, after reading, the connection is shutting down ... instead, are we not considered to be some other mechanism? If so, what is the correct approach?

There was an error from the socket that is going to stop there only (Recv), otherwise it will be with the data The deal, which was read, even though it could not be read. Will you read it again when it will be hidden again?

Comments

Post a Comment

Popular posts from this blog

sql - dynamically varied number of conditions in the 'where' statement using LINQ -

I am using my first project LINQ (in mvc), so maybe there's something very simple that I remember. However, a day of searching and experimenting does not work, so it works. I am trying to write a LINQ query (Linux to SQL) in which in many cases where the statement is different from an OR or an AND. We do not know how many conditions are going in the query till runtime. This search is for filter control, where the user can choose multiple criteria for filtering. Select from table where table.col = 1 or table.col = 2 or table.col = 7 .... 'Other number of conditions Before I just create the SQL query as a string, while looping over all the situations. However, it seems that there should be a good way to do this in LINQ. I tried to use Expression trees, but they had a second thought for this moment on my head, where the lambda function was to be executed inside the statement such as: values ​​for matchingRows = matchingRows for each value Where (function (row) row.c...
Read more

asp.net mvc - Dynamically Generated Ajax.BeginForm -

I have a problem with ASP.NET MVC Ajax forms. I generate many Ajax form in a table such as: & Lt; Input type = "submit" name = "activity" value = "add activity" / & gt; & Lt;%}% & gt; & Lt; / TD & gt; & Lt; / TR & gt; & Lt;%}% & gt; So far so good. When I post one of those forms, it gives a partial view in a div, and in this new partial view a new Ajax Beginnform (which is not in Genesis form) This second Ajax Beginnorf is exactly like the ones I got on the table, but when I post it, I do not get the "Ajax Post", but a normal post that sends me to a new page, I do not know whether the two Ajax forms What is the reason for the difference between, why is it the "dynamically generated" Ajax form behaves like a normal HTML form? By the way, I know that I can do it in different ways using javascript, but I would like to understand whether it can only be done using MVC helplars and Ajax lib...
Read more

Debug on symbian -

I am using trk for phone debug This works well for the Holorld project But when I start the project in phone debug mode 1) the load failed 2) TrkProtocolPlugin: to target the specified file Failure (please verify If any body understands what problem I am experiencing, then this problem helps me Pre-release If the application has the privileges assigned (with the appropriate certificate) itemprop = "text" > In your case, I will check: / li> If there is no conflict of application ID with any other application of device If there are problematic commands in the installation package (for example copy copy for non-accessible directories)
Read more