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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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LOGGER(1)						    BSD General Commands Manual 						 LOGGER(1)

NAME
logger -- make entries in the system log SYNOPSIS
logger [-is] [-d SD] [-f file] [-m msgid] [-p pri] [-t tag] [message ...] DESCRIPTION
logger provides a shell command interface to the syslog(3) system log module. Options: -d sd Log this in the structured data (SD) field. (sd has to be passed as one argument and will require careful quoting when used from the shell.) -f file Log the specified file. -i Log the process id of the logger process with each line. -m msgid The MSGID used for the message. -p pri Enter the message with the specified priority. The priority may be specified numerically or as a ``facility.level'' pair. For example, ``-p local3.info'' logs the message(s) as informational level in the local3 facility. The default is ``user.notice''. -s Log the message to standard error, as well as the system log. -t tag Mark every line in the log with the specified tag. message Write the message to log; if not specified, and the -f flag is not provided, standard input is logged. EXIT STATUS
The logger utility exits 0 on success, and >0 if an error occurs. EXAMPLES
logger System rebooted logger -p local0.notice -t HOSTIDM -f /dev/idmc SEE ALSO
syslog(3), syslogd(8) STANDARDS
The logger utility conforms to IEEE Std 1003.2-1992 (``POSIX.2''). BSD
May 14, 2010 BSD
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