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unix: implement kqueue file watcher API
kqueue fds are not embeddable into other pollsets (select, poll, kqueue). Hack the libev event loop to receive kqueue events with filter flags intact.
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| Original file line number | Diff line number | Diff line change |
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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 "internal.h" | ||
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| #include <assert.h> | ||
| #include <stdlib.h> | ||
| #include <string.h> | ||
| #include <errno.h> | ||
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| #include <sys/sysctl.h> | ||
| #include <sys/types.h> | ||
| #include <sys/event.h> | ||
| #include <fcntl.h> | ||
| #include <time.h> | ||
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| static void uv__fs_event(EV_P_ ev_io* w, int revents); | ||
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| static void uv__fs_event_start(uv_fs_event_t* handle) { | ||
| ev_io_init(&handle->event_watcher, | ||
| uv__fs_event, | ||
| handle->fd, | ||
| EV_LIBUV_KQUEUE_HACK); | ||
| ev_io_start(handle->loop->ev, &handle->event_watcher); | ||
| } | ||
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| static void uv__fs_event_stop(uv_fs_event_t* handle) { | ||
| ev_io_stop(handle->loop->ev, &handle->event_watcher); | ||
| } | ||
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| static void uv__fs_event(EV_P_ ev_io* w, int revents) { | ||
| uv_fs_event_t* handle; | ||
| int events; | ||
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| assert(revents == EV_LIBUV_KQUEUE_HACK); | ||
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| handle = container_of(w, uv_fs_event_t, event_watcher); | ||
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| if (handle->fflags & (NOTE_ATTRIB | NOTE_EXTEND)) | ||
| events = UV_CHANGE; | ||
| else | ||
| events = UV_RENAME; | ||
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| handle->cb(handle, NULL, events, 0); | ||
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| uv__fs_event_stop(handle); | ||
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| /* File watcher operates in one-shot mode, re-arm it. */ | ||
| if (handle->fd != -1) | ||
| uv__fs_event_start(handle); | ||
| } | ||
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| /* Called by libev, don't touch. */ | ||
| void uv__kqueue_hack(EV_P_ int fflags, ev_io *w) { | ||
| uv_fs_event_t* handle; | ||
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| handle = container_of(w, uv_fs_event_t, event_watcher); | ||
| handle->fflags = fflags; | ||
| } | ||
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| int uv_fs_event_init(uv_loop_t* loop, | ||
| uv_fs_event_t* handle, | ||
| const char* filename, | ||
| uv_fs_event_cb cb) { | ||
| #if HAVE_KQUEUE | ||
| int fd; | ||
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| if (cb == NULL) { | ||
| uv__set_sys_error(loop, EINVAL); | ||
| return -1; | ||
| } | ||
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| /* TODO open asynchronously - but how do we report back errors? */ | ||
| if ((fd = open(filename, O_RDONLY)) == -1) { | ||
| uv__set_sys_error(loop, errno); | ||
| return -1; | ||
| } | ||
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| uv__handle_init(loop, (uv_handle_t*)handle, UV_FS_EVENT); | ||
| handle->filename = strdup(filename); | ||
| handle->fflags = 0; | ||
| handle->cb = cb; | ||
| handle->fd = fd; | ||
| uv__fs_event_start(handle); | ||
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| return 0; | ||
| #else | ||
| uv__set_sys_error(loop, ENOSYS); | ||
| return -1; | ||
| #endif | ||
| } | ||
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| void uv__fs_event_destroy(uv_fs_event_t* handle) { | ||
| free(handle->filename); | ||
| uv__close(handle->fd); | ||
| handle->fd = -1; | ||
| } |
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