fd_errno.h

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/*
 *      Code snippet to avoid duplication.
 */
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.
         */
        my->flag_blocked = true;
        return fr_bio_error(IO_WOULD_BLOCK);
 
default:
        /*
         *      Some other error, it's fatal.
         */
        break;
}