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windows, unix: share c-ares glue code
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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved. | ||
* | ||
* Permission is hereby granted, free of charge, to any person obtaining a copy | ||
* of this software and associated documentation files (the "Software"), to | ||
* deal in the Software without restriction, including without limitation the | ||
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | ||
* sell copies of the Software, and to permit persons to whom the Software is | ||
* furnished to do so, subject to the following conditions: | ||
* | ||
* The above copyright notice and this permission notice shall be included in | ||
* all copies or substantial portions of the Software. | ||
* | ||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | ||
* IN THE SOFTWARE. | ||
*/ | ||
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#include "uv.h" | ||
#include "uv-common.h" | ||
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#include <assert.h> | ||
#include <errno.h> | ||
#include <stdlib.h> | ||
#include <string.h> | ||
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/* This is called once per second by loop->timer. It is used to constantly */ | ||
/* call back into c-ares for possibly processing timeouts. */ | ||
static void uv__ares_timeout(uv_timer_t* handle, int status) { | ||
assert(!uv_ares_handles_empty(handle->loop)); | ||
ares_process_fd(handle->loop->channel, ARES_SOCKET_BAD, ARES_SOCKET_BAD); | ||
} | ||
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static void uv__ares_poll_cb(uv_poll_t* watcher, int status, int events) { | ||
uv_loop_t* loop = watcher->loop; | ||
uv_ares_task_t* task = container_of(watcher, uv_ares_task_t, poll_watcher); | ||
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/* Reset the idle timer */ | ||
uv_timer_again(&loop->ares_timer); | ||
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if (status < 0) { | ||
/* An error happened. Just pretend that the socket is both readable and */ | ||
/* writable. */ | ||
ares_process_fd(loop->channel, task->sock, task->sock); | ||
return; | ||
} | ||
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/* Process DNS responses */ | ||
ares_process_fd(loop->channel, | ||
events & UV_READABLE ? task->sock : ARES_SOCKET_BAD, | ||
events & UV_WRITABLE ? task->sock : ARES_SOCKET_BAD); | ||
} | ||
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static void uv__ares_poll_close_cb(uv_handle_t* watcher) { | ||
uv_ares_task_t* task = container_of(watcher, uv_ares_task_t, poll_watcher); | ||
free(task); | ||
} | ||
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/* Allocates and returns a new uv_ares_task_t */ | ||
static uv_ares_task_t* uv__ares_task_create(uv_loop_t* loop, ares_socket_t sock) { | ||
uv_ares_task_t* task = (uv_ares_task_t*) malloc(sizeof *task); | ||
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if (task == NULL) { | ||
/* Out of memory. */ | ||
return NULL; | ||
} | ||
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task->loop = loop; | ||
task->sock = sock; | ||
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if (uv_poll_init_socket(loop, &task->poll_watcher, sock) < 0) { | ||
/* This should never happen. */ | ||
free(task); | ||
return NULL; | ||
} | ||
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return task; | ||
} | ||
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/* Callback from ares when socket operation is started */ | ||
static void uv__ares_sockstate_cb(void* data, ares_socket_t sock, | ||
int read, int write) { | ||
uv_loop_t* loop = (uv_loop_t*) data; | ||
uv_ares_task_t* task; | ||
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task = uv_find_ares_handle(loop, sock); | ||
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if (read || write) { | ||
if (!task) { | ||
/* New socket */ | ||
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/* If this is the first socket then start the timer. */ | ||
if (!uv_is_active((uv_handle_t*) &loop->ares_timer)) { | ||
assert(uv_ares_handles_empty(loop)); | ||
uv_timer_start(&loop->ares_timer, uv__ares_timeout, 1000, 1000); | ||
} | ||
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task = uv__ares_task_create(loop, sock); | ||
if (task == NULL) { | ||
/* This should never happen unless we're out of memory or something */ | ||
/* is seriously wrong. The socket won't be polled, but the the query */ | ||
/* will eventually time out. */ | ||
return; | ||
} | ||
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uv_add_ares_handle(loop, task); | ||
} | ||
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/* This should never fail. If it fails anyway, the query will eventually */ | ||
/* time out. */ | ||
uv_poll_start(&task->poll_watcher, | ||
(read ? UV_READABLE : 0) | (write ? UV_WRITABLE : 0), | ||
uv__ares_poll_cb); | ||
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} else { | ||
/* read == 0 and write == 0 this is c-ares's way of notifying us that */ | ||
/* the socket is now closed. We must free the data associated with */ | ||
/* socket. */ | ||
assert(task && | ||
"When an ares socket is closed we should have a handle for it"); | ||
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uv_remove_ares_handle(task); | ||
uv_close((uv_handle_t*) &task->poll_watcher, uv__ares_poll_close_cb); | ||
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if (uv_ares_handles_empty(loop)) { | ||
uv_timer_stop(&loop->ares_timer); | ||
} | ||
} | ||
} | ||
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/* C-ares integration initialize and terminate */ | ||
int uv_ares_init_options(uv_loop_t* loop, ares_channel *channelptr, | ||
struct ares_options *options, int optmask) { | ||
int rc; | ||
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/* only allow single init at a time */ | ||
if (loop->channel != NULL) { | ||
uv__set_artificial_error(loop, UV_EALREADY); | ||
return -1; | ||
} | ||
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/* set our callback as an option */ | ||
options->sock_state_cb = uv__ares_sockstate_cb; | ||
options->sock_state_cb_data = loop; | ||
optmask |= ARES_OPT_SOCK_STATE_CB; | ||
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/* We do the call to ares_init_option for caller. */ | ||
rc = ares_init_options(channelptr, options, optmask); | ||
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/* if success, save channel */ | ||
if (rc == ARES_SUCCESS) { | ||
loop->channel = *channelptr; | ||
} | ||
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/* Initialize the timeout timer. The timer won't be started until the */ | ||
/* first socket is opened. */ | ||
uv_timer_init(loop, &loop->ares_timer); | ||
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return rc; | ||
} | ||
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void uv_ares_destroy(uv_loop_t* loop, ares_channel channel) { | ||
/* Only allow destroy if did init. */ | ||
if (loop->channel) { | ||
uv_timer_stop(&loop->ares_timer); | ||
ares_destroy(channel); | ||
loop->channel = NULL; | ||
} | ||
} |
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