115 lines
2.9 KiB
C++
115 lines
2.9 KiB
C++
/*
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* Copyright (C) 2003-2013 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "InotifySource.hxx"
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#include "InotifyDomain.hxx"
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#include "util/Error.hxx"
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#include "system/fd_util.h"
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#include "system/FatalError.hxx"
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#include "Log.hxx"
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#include <sys/inotify.h>
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#include <unistd.h>
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#include <errno.h>
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bool
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InotifySource::OnSocketReady(gcc_unused unsigned flags)
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{
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const auto dest = buffer.Write();
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if (dest.IsEmpty())
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FatalError("buffer full");
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ssize_t nbytes = read(Get(), dest.data, dest.size);
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if (nbytes < 0)
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FatalSystemError("Failed to read from inotify");
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if (nbytes == 0)
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FatalError("end of file from inotify");
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buffer.Append(nbytes);
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while (true) {
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const char *name;
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auto range = buffer.Read();
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const struct inotify_event *event =
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(const struct inotify_event *)
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range.data;
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if (range.size < sizeof(*event) ||
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range.size < sizeof(*event) + event->len)
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break;
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if (event->len > 0 && event->name[event->len - 1] == 0)
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name = event->name;
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else
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name = nullptr;
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callback(event->wd, event->mask, name, callback_ctx);
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buffer.Consume(sizeof(*event) + event->len);
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}
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return true;
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}
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inline
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InotifySource::InotifySource(EventLoop &_loop,
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mpd_inotify_callback_t _callback, void *_ctx,
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int _fd)
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:SocketMonitor(_fd, _loop),
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callback(_callback), callback_ctx(_ctx)
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{
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ScheduleRead();
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}
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InotifySource *
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InotifySource::Create(EventLoop &loop,
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mpd_inotify_callback_t callback, void *callback_ctx,
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Error &error)
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{
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int fd = inotify_init_cloexec();
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if (fd < 0) {
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error.SetErrno("inotify_init() has failed");
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return nullptr;
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}
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return new InotifySource(loop, callback, callback_ctx, fd);
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}
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int
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InotifySource::Add(const char *path_fs, unsigned mask, Error &error)
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{
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int wd = inotify_add_watch(Get(), path_fs, mask);
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if (wd < 0)
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error.SetErrno("inotify_add_watch() has failed");
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return wd;
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}
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void
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InotifySource::Remove(unsigned wd)
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{
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int ret = inotify_rm_watch(Get(), wd);
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if (ret < 0 && errno != EINVAL)
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LogErrno(inotify_domain, "inotify_rm_watch() has failed");
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/* EINVAL may happen here when the file has been deleted; the
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kernel seems to auto-unregister deleted files */
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}
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