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c-ares
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- Tommie Gannert pointed out a silly bug in ares_process_fd() since it didn't 

check for broken connections like ares_process() did. Based on that, I
  merged the two functions into a single generic one with two front-ends.
This commit is contained in:
Daniel Stenberg 2010-01-28 22:03:48 +00:00
parent 004c2e3400
commit 8b6f71ce95
3 changed files with 35 additions and 22 deletions
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5
CHANGES
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@ -1,5 +1,10 @@
Changelog for the c-ares project
* January 28, 2010 (Daniel Stenberg)
- Tommie Gannert pointed out a silly bug in ares_process_fd() since it didn't
check for broken connections like ares_process() did. Based on that, I
merged the two functions into a single generic one with two front-ends.
* December 29, 2009 (Yang Tse)
- Laszlo Tamas Szabo adjusted Makefile.msvc compiler options so that where
run-time error checks enabling compiler option /GZ was used it is replaced

3
RELEASE-NOTES
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@ -8,9 +8,10 @@ Fixed:
o closing of sockets on Windows systems
o MSVC deprecated compiler options warnings
o ares_process_fd() didn't check broken connections
Thanks go to these friendly people for their efforts and contributions:
Ingmar Runge, Laszlo Tamas Szabo
Ingmar Runge, Laszlo Tamas Szabo, Yang Tse, Tommie Gannert
Have fun!

49
ares_process.c
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@ -1,7 +1,7 @@
/* $Id$ */
/* Copyright 1998 by the Massachusetts Institute of Technology.
* Copyright (C) 2004-2009 by Daniel Stenberg
* Copyright (C) 2004-2010 by Daniel Stenberg
*
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
@ -139,18 +139,28 @@ long ares__timeoffset(struct timeval *now,
}
/*
* generic process function
*/
static void processfds(ares_channel channel,
fd_set *read_fds, ares_socket_t read_fd,
fd_set *write_fds, ares_socket_t write_fd)
{
struct timeval now = ares__tvnow();
write_tcp_data(channel, write_fds, write_fd, &now);
read_tcp_data(channel, read_fds, read_fd, &now);
read_udp_packets(channel, read_fds, read_fd, &now);
process_timeouts(channel, &now);
process_broken_connections(channel, &now);
}
/* Something interesting happened on the wire, or there was a timeout.
* See what's up and respond accordingly.
*/
void ares_process(ares_channel channel, fd_set *read_fds, fd_set *write_fds)
{
struct timeval now = ares__tvnow();
write_tcp_data(channel, write_fds, ARES_SOCKET_BAD, &now);
read_tcp_data(channel, read_fds, ARES_SOCKET_BAD, &now);
read_udp_packets(channel, read_fds, ARES_SOCKET_BAD, &now);
process_timeouts(channel, &now);
process_broken_connections(channel, &now);
processfds(channel, read_fds, ARES_SOCKET_BAD, write_fds, ARES_SOCKET_BAD);
}
/* Something interesting happened on the wire, or there was a timeout.
@ -161,12 +171,7 @@ void ares_process_fd(ares_channel channel,
file descriptors */
ares_socket_t write_fd)
{
struct timeval now = ares__tvnow();
write_tcp_data(channel, NULL, write_fd, &now);
read_tcp_data(channel, NULL, read_fd, &now);
read_udp_packets(channel, NULL, read_fd, &now);
process_timeouts(channel, &now);
processfds(channel, NULL, read_fd, NULL, write_fd);
}
@ -174,7 +179,8 @@ void ares_process_fd(ares_channel channel,
* otherwise. This is mostly for HP-UX, which could return EAGAIN or
* EWOULDBLOCK. See this man page
*
* http://devrsrc1.external.hp.com/STKS/cgi-bin/man2html?manpage=/usr/share/man/man2.Z/send.2
* http://devrsrc1.external.hp.com/STKS/cgi-bin/man2html?
* manpage=/usr/share/man/man2.Z/send.2
*/
static int try_again(int errnum)
{
@ -802,8 +808,9 @@ void ares__send_query(ares_channel channel, struct query *query,
}
/*
* setsocknonblock sets the given socket to either blocking or non-blocking mode
* based on the 'nonblock' boolean argument. This function is highly portable.
* setsocknonblock sets the given socket to either blocking or non-blocking
* mode based on the 'nonblock' boolean argument. This function is highly
* portable.
*/
static int setsocknonblock(ares_socket_t sockfd, /* operate on this */
int nonblock /* TRUE or FALSE */)
@ -902,10 +909,10 @@ static int open_tcp_socket(ares_channel channel, struct server_state *server)
#ifdef TCP_NODELAY
/*
* Disable the Nagle algorithm (only relevant for TCP sockets, and thus not in
* configure_socket). In general, in DNS lookups we're pretty much interested
* in firing off a single request and then waiting for a reply, so batching
* isn't very interesting in general.
* Disable the Nagle algorithm (only relevant for TCP sockets, and thus not
* in configure_socket). In general, in DNS lookups we're pretty much
* interested in firing off a single request and then waiting for a reply,
* so batching isn't very interesting in general.
*/
opt = 1;
if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY,