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Full Discussion: checking a connection still exists?
Special Forums IP Networking checking a connection still exists? Post 302151168 by fishman2001 on Thursday 13th of December 2007 05:51:17 PM
Old 12-13-2007
Bug checking a connection still exists?
Hi I have a bit of c code which I'm trying to use as a relay between apache and a scgi cluster.
Example of problem code is below:

while((n = recv(scgiSock, local_data, MAX_LENGTH, 0)) > 0)
{
time(&t2);
time_now = t2 - t1;
if(time_now > TIMEOUT)
throw 1;
#ifdef UN_NES_DEBUG
logger("scgi : length := ", 1, n);
#endif
logger("sending data: length = ", 1, n);
logger("send ret:= %d", 1, send(receiveSock, local_data, n, 0));
count++;
bzero(local_data, MAX_LENGTH + 1);
sum += n;
logger("Receiving data: current sum = ", 1, sum);
}

I'm encountering a slight but probably easily solveable problem; sometimes apache drops the connection and as a result my program crashes out when trying to send data back on the socket.
Is there any way to check that the socket is still alive before sending data?

Cheers.
Fish.
 

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LEARN ABOUT ULTRIX

qmail-start

qmail-start(8)                                                System Manager's Manual                                               qmail-start(8)

NAME

       qmail-start - turn on mail delivery

SYNOPSIS

       qmail-start [ defaultdelivery [ logger arg ...  ] ]

DESCRIPTION

       qmail-start  invokes qmail-send, qmail-lspawn, qmail-rspawn, and qmail-clean, under the proper uids and gids.  These four daemons cooperate
       to deliver messages from the queue.

       qmail-start arranges for qmail-send's activity record to be sent to qmail-start's output.  See qmail-log(5) for the format of the  activity
       record.  Other than this, qmail-start does not print anything, even on failure.

       If defaultdelivery is supplied, qmail-start passes it to qmail-lspawn.

       If logger is supplied, qmail-start invokes logger with the given arguments, and feeds qmail-send's activity record through logger.

       Environment variables given to qmail-start will eventually be passed on to qmail-local, so make sure to clean up the environment if you run
       qmail-start manually:

          # env - PATH="/var/lib/qmail/bin:$PATH"
          qmail-start ./Mailbox splogger qmail &
          (all on one line)

       Resource limits, controlling ttys, et al. are also passed from qmail-start to qmail-local.

       Note that qmail-send normally juggles several simultaneous deliveries.  To reduce qmail-send's impact on other programs, you can run qmail-
       start with a low priority.

SEE ALSO

       logger(1), splogger(1), nice(1), qmail-log(5), qmail-local(8), qmail-clean(8), qmail-lspawn(8), qmail-rspawn(8), qmail-send(8)

                                                                                                                                    qmail-start(8)
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