Mercurial > dropbear
changeset 251:b02e8eef3c3a
- new function to set "low delay" for a packet, set the ip TOS bit
(can help significantly over some links)
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Wed, 21 Sep 2005 15:58:19 +0000 |
| parents | d059b0bb57dd |
| children | 29afa62b5450 84925eceeb13 |
| files | dbutil.c includes.h |
| diffstat | 2 files changed, 27 insertions(+), 4 deletions(-) [+] |
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--- a/dbutil.c Tue Sep 20 17:36:32 2005 +0000 +++ b/dbutil.c Wed Sep 21 15:58:19 2005 +0000 @@ -153,6 +153,30 @@ } #endif /* DEBUG_TRACE */ +static void set_sock_priority(int sock) { + + int val; + + /* disable nagle */ + val = 1; + setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void*)&val, sizeof(val)); + + /* set the TOS bit. note that this will fail for ipv6, I can't find any + * equivalent. */ +#ifdef IPTOS_LOWDELAY + val = IPTOS_LOWDELAY; + setsockopt(sock, IPPROTO_IP, IP_TOS, (void*)&val, sizeof(val)); +#endif + +#ifdef SO_PRIORITY + /* linux specific, sets QoS class. + * 6 looks to be optimal for interactive traffic (see tc-prio(8) ). */ + val = 6; + setsockopt(sock, SOL_SOCKET, SO_PRIORITY, (void*) &val, sizeof(val)); +#endif + +} + /* Listen on address:port. Unless address is NULL, in which case listen on * everything. If called with address == "", we'll listen on localhost/loopback. * Returns the number of sockets bound on success, or -1 on failure. On @@ -223,8 +247,7 @@ linger.l_linger = 5; setsockopt(sock, SOL_SOCKET, SO_LINGER, (void*)&linger, sizeof(linger)); - /* disable nagle */ - setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void*)&val, sizeof(val)); + set_sock_priority(sock); if (bind(sock, res->ai_addr, res->ai_addrlen) < 0) { err = errno; @@ -347,8 +370,7 @@ TRACE(("Error connecting: %s", strerror(err))) } else { /* Success */ - /* (err is used as a dummy var here) */ - setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void*)&err, sizeof(err)); + set_sock_priority(sock); } freeaddrinfo(res0);