fd_errno.h

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/*
 *      We have an error, so we have common error handling code.
 */
switch (errno) {
case EINTR:
        /*
         *      Try a few times before giving up.
         */
        tries++;
        if (tries <= my->max_tries) goto retry;
        return 0;
 
#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN)
case EWOULDBLOCK:
#endif
case EAGAIN:
        /*
         *      The operation would block, return that.
         */
        if (!my->info.flag_blocked) {
                my->info.flag_blocked = true;
 
                if (my->cb.flag_blocked) {
                        rcode = my->cb.flag_blocked((fr_bio_t *) my);
                        if (rcode < 0) return rcode;
                }
        }
        return fr_bio_error(IO_WOULD_BLOCK);
 
#ifndef NDEBUG
case ENOTCONN:
        /*
         *      We're doing a read/write to a socket which isn't connected.  This is a failure of the
         *      application state machine.
         */
        fr_assert(0);
        break;
#endif
 
case ECONNRESET:
case EPIPE:
        /*
         *      The other end closed the connection, signal the application that it's a (maybe) clean close,
         *      and set EOF on the BIO.
         */
        fr_bio_eof(&my->bio);
        return 0;
 
default:
        /*
         *      Some other error, it's fatal.
         */
        break;
}
 
/*
 *      Shut down the BIO.  It's no longer useable.
 */
fr_bio_shutdown(&my->bio);