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unix, windows: add stat() based file watcher
Monitors a file path for changes. Supersedes ev_stat.
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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 <stdlib.h> | ||
#include <string.h> | ||
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#ifdef _WIN32 | ||
typedef struct _stati64 uv__statbuf_t; | ||
#else | ||
typedef struct stat uv__statbuf_t; | ||
#endif | ||
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static int statbuf_eq(const uv__statbuf_t* a, const uv__statbuf_t* b); | ||
static void timer_cb(uv_timer_t* timer, int status); | ||
static void poll_cb(uv_fs_t* req); | ||
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int uv_fs_poll_init(uv_loop_t* loop, uv_fs_poll_t* handle) { | ||
/* TODO(bnoordhuis) Mark fs_req internal. */ | ||
uv__handle_init(loop, (uv_handle_t*)handle, UV_FS_POLL); | ||
loop->counters.fs_poll_init++; | ||
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if (uv_timer_init(loop, &handle->timer_handle)) | ||
return -1; | ||
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handle->timer_handle.flags |= UV__HANDLE_INTERNAL; | ||
uv__handle_unref(&handle->timer_handle); | ||
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return 0; | ||
} | ||
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int uv_fs_poll_start(uv_fs_poll_t* handle, | ||
uv_fs_poll_cb cb, | ||
const char* path, | ||
unsigned int interval) { | ||
uv_fs_t* req; | ||
size_t len; | ||
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if (uv__is_active(handle)) | ||
return 0; | ||
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len = strlen(path) + 1; | ||
req = malloc(sizeof(*req) + len); | ||
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if (req == NULL) | ||
return uv__set_artificial_error(handle->loop, UV_ENOMEM); | ||
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req->data = handle; | ||
handle->path = memcpy(req + 1, path, len); | ||
handle->fs_req = req; | ||
handle->poll_cb = cb; | ||
handle->interval = interval ? interval : 1; | ||
handle->start_time = uv_now(handle->loop); | ||
handle->busy_polling = 0; | ||
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if (uv_fs_stat(handle->loop, handle->fs_req, handle->path, poll_cb)) | ||
abort(); | ||
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uv__handle_start(handle); | ||
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return 0; | ||
} | ||
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int uv_fs_poll_stop(uv_fs_poll_t* handle) { | ||
if (!uv__is_active(handle)) | ||
return 0; | ||
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/* Don't free the fs req if it's active. Signal poll_cb that it needs to free | ||
* the req by removing the handle backlink. | ||
* | ||
* TODO(bnoordhuis) Have uv-unix postpone the close callback until the req | ||
* finishes so we don't need this pointer / lifecycle hackery. The callback | ||
* always runs on the next tick now. | ||
*/ | ||
if (handle->fs_req->data) | ||
handle->fs_req->data = NULL; | ||
else | ||
free(handle->fs_req); | ||
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handle->fs_req = NULL; | ||
handle->path = NULL; | ||
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uv_timer_stop(&handle->timer_handle); | ||
uv__handle_stop(handle); | ||
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return 0; | ||
} | ||
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void uv__fs_poll_close(uv_fs_poll_t* handle) { | ||
uv_fs_poll_stop(handle); | ||
uv_close((uv_handle_t*)&handle->timer_handle, NULL); | ||
} | ||
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static void timer_cb(uv_timer_t* timer, int status) { | ||
uv_fs_poll_t* handle; | ||
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handle = container_of(timer, uv_fs_poll_t, timer_handle); | ||
handle->start_time = uv_now(handle->loop); | ||
handle->fs_req->data = handle; | ||
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if (uv_fs_stat(handle->loop, handle->fs_req, handle->path, poll_cb)) | ||
abort(); | ||
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assert(uv__is_active(handle)); | ||
} | ||
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static void poll_cb(uv_fs_t* req) { | ||
uv__statbuf_t* statbuf; | ||
uv_fs_poll_t* handle; | ||
uint64_t interval; | ||
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handle = req->data; | ||
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if (handle == NULL) /* Handle has been stopped or closed. */ | ||
goto out; | ||
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assert(req == handle->fs_req); | ||
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if (req->result != 0) { | ||
/* TODO(bnoordhuis) Only signal the error the first time? What if the | ||
* error reason changes? | ||
*/ | ||
uv__set_artificial_error(handle->loop, req->errorno); | ||
handle->poll_cb(handle, -1); | ||
handle->busy_polling = -1; | ||
goto out; | ||
} | ||
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statbuf = req->ptr; | ||
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if (handle->busy_polling == 0) { | ||
handle->statbuf = *statbuf; | ||
handle->busy_polling = 1; | ||
} | ||
else if (handle->busy_polling == -1) { | ||
handle->statbuf = *statbuf; | ||
handle->busy_polling = 1; | ||
handle->poll_cb(handle, 0); /* Error went away. */ | ||
} | ||
else if (!statbuf_eq(statbuf, &handle->statbuf)) { | ||
handle->statbuf = *statbuf; | ||
handle->poll_cb(handle, 0); | ||
} | ||
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out: | ||
uv_fs_req_cleanup(req); | ||
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if (req->data == NULL) { /* Handle has been stopped or closed. */ | ||
free(req); | ||
return; | ||
} | ||
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req->data = NULL; /* Tell uv_fs_poll_stop() it's safe to free the req. */ | ||
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/* Reschedule timer, subtract the delay from doing the stat(). */ | ||
interval = handle->interval; | ||
interval -= (uv_now(handle->loop) - handle->start_time) % interval; | ||
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if (uv_timer_start(&handle->timer_handle, timer_cb, interval, 0)) | ||
abort(); | ||
} | ||
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static int statbuf_eq(const uv__statbuf_t* a, const uv__statbuf_t* b) { | ||
#ifdef _WIN32 | ||
return a->st_mtime == b->st_mtime | ||
&& a->st_size == b->st_size | ||
&& a->st_mode == b->st_mode; | ||
#else | ||
return a->st_ctime == b->st_ctime | ||
&& a->st_mtime == b->st_mtime | ||
&& a->st_size == b->st_size | ||
&& a->st_mode == b->st_mode | ||
&& a->st_uid == b->st_uid | ||
&& a->st_gid == b->st_gid | ||
&& a->st_ino == b->st_ino | ||
&& a->st_dev == b->st_dev; | ||
#endif | ||
} | ||
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#ifdef _WIN32 | ||
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#include "win/internal.h" | ||
#include "win/handle-inl.h" | ||
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void uv__fs_poll_endgame(uv_loop_t* loop, uv_fs_poll_t* handle) { | ||
assert(handle->flags & UV_HANDLE_CLOSING); | ||
assert(!(handle->flags & UV_HANDLE_CLOSED)); | ||
uv__handle_stop(handle); | ||
uv__handle_close(handle); | ||
} | ||
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#endif /* _WIN32 */ |
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