mirror of https://github.com/c-ares/c-ares.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
72 lines
2.3 KiB
72 lines
2.3 KiB
|
|
/* Copyright (C) 2005 - 2010, Daniel Stenberg |
|
* |
|
* Permission to use, copy, modify, and distribute this software and its |
|
* documentation for any purpose and without fee is hereby granted, provided |
|
* that the above copyright notice appear in all copies and that both that |
|
* copyright notice and this permission notice appear in supporting |
|
* documentation, and that the name of M.I.T. not be used in advertising or |
|
* publicity pertaining to distribution of the software without specific, |
|
* written prior permission. M.I.T. makes no representations about the |
|
* suitability of this software for any purpose. It is provided "as is" |
|
* without express or implied warranty. |
|
*/ |
|
|
|
#include "ares_setup.h" |
|
|
|
#ifdef HAVE_SYS_TIME_H |
|
#include <sys/time.h> |
|
#endif |
|
|
|
#include "ares.h" |
|
#include "ares_private.h" |
|
|
|
int ares_getsock(ares_channel channel, |
|
ares_socket_t *socks, |
|
int numsocks) /* size of the 'socks' array */ |
|
{ |
|
struct server_state *server; |
|
int i; |
|
int sockindex=0; |
|
int bitmap = 0; |
|
unsigned int setbits = 0xffffffff; |
|
|
|
/* Are there any active queries? */ |
|
int active_queries = !ares__is_list_empty(&(channel->all_queries)); |
|
|
|
for (i = 0; |
|
(i < channel->nservers) && (sockindex < ARES_GETSOCK_MAXNUM); |
|
i++) |
|
{ |
|
server = &channel->servers[i]; |
|
/* We only need to register interest in UDP sockets if we have |
|
* outstanding queries. |
|
*/ |
|
if (active_queries && server->udp_socket != ARES_SOCKET_BAD) |
|
{ |
|
if(sockindex >= numsocks) |
|
break; |
|
socks[sockindex] = server->udp_socket; |
|
bitmap |= ARES_GETSOCK_READABLE(setbits, sockindex); |
|
sockindex++; |
|
} |
|
/* We always register for TCP events, because we want to know |
|
* when the other side closes the connection, so we don't waste |
|
* time trying to use a broken connection. |
|
*/ |
|
if (server->tcp_socket != ARES_SOCKET_BAD) |
|
{ |
|
if(sockindex >= numsocks) |
|
break; |
|
socks[sockindex] = server->tcp_socket; |
|
bitmap |= ARES_GETSOCK_READABLE(setbits, sockindex); |
|
|
|
if (server->qhead && active_queries) |
|
/* then the tcp socket is also writable! */ |
|
bitmap |= ARES_GETSOCK_WRITABLE(setbits, sockindex); |
|
|
|
sockindex++; |
|
} |
|
} |
|
return bitmap; |
|
}
|
|
|