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Better handle the case with a network that drops packets by retrying

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with a back off.  This was discovered when Luigi sent me code to
handle this for Etherboot.  The Etherboot patch worked okay but
FreeBSD's tftpd had trouble handling it and would fail to transfer
the file since it would abort on send and not retry.

Submitted by:	luigi
MFC after:	1 week
This commit is contained in:
Doug Ambrisko 2002-04-09 19:13:43 +00:00
parent 7f5092f330
commit ff93f08c06
1 changed files with 13 additions and 3 deletions
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16
libexec/tftpd/tftpd.c
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@ -576,9 +576,19 @@ xmitfile(struct formats *pf)
(void)setjmp(timeoutbuf);
send_data:
if (send(peer, dp, size + 4, 0) != size + 4) {
syslog(LOG_ERR, "write: %m");
goto abort;
{
int i, t = 1;
for (i = 0; ; i++){
if (send(peer, dp, size + 4, 0) != size + 4) {
sleep(t);
t = (t < 32) ? t<< 1 : t;
if (i >= 12) {
syslog(LOG_ERR, "write: %m");
goto abort;
}
}
break;
}
}
read_ahead(file, pf->f_convert);
for ( ; ; ) {