mirror of
https://github.com/troglobit/finit.git
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Joachim Nilsson
88a4ebf9e7
Libraries and system headers should be included with <> instead of "". This makes a great difference for the automatic dependency tracking. Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
102 lines
2.8 KiB
C
102 lines
2.8 KiB
C
/* Optional TTY Watcher, used to catch new TTYs that are discovered, e.g., USB
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*
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* Copyright (c) 2013 Mattias Walström <lazzer@gmail.com>
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* Copyright (c) 2013 Joachim Nilsson <troglobit@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <errno.h>
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#include <fcntl.h> /* O_RDONLY et al */
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#include <unistd.h> /* read() */
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#include <sys/inotify.h>
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#include <sys/stat.h>
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#include <lite/lite.h>
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#include "../finit.h"
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#include "../helpers.h"
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#include "../plugin.h"
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#include "../tty.h"
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static void watcher(void *arg, int fd, int events);
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static plugin_t plugin = {
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.name = __FILE__,
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.io = {
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.cb = watcher,
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.flags = PLUGIN_IO_READ,
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},
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};
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static void setup(void)
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{
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if (plugin.io.fd)
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close(plugin.io.fd);
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plugin.io.fd = inotify_init1(IN_NONBLOCK | IN_CLOEXEC);
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if (-1 == plugin.io.fd || inotify_add_watch(plugin.io.fd, "/dev", IN_CREATE | IN_DELETE) < 0)
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_e("Failed starting TTY watcher: %s", strerror(errno));
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}
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static void watcher(void *UNUSED(arg), int fd, int UNUSED(events))
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{
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int len = 0;
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char buf[EVENT_SIZE], name[42];
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tty_node_t *entry;
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struct inotify_event *notified = (struct inotify_event *)buf;
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while ((len = read(fd, buf, sizeof(buf)))) {
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if (-1 == len) {
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if (errno == EINVAL)
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setup();
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if (errno == EINTR)
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continue;
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break; /* Likely EAGAIN */
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}
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snprintf(name, sizeof(name), "/dev/%s", notified->name);
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entry = tty_find(name);
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if (entry && tty_enabled(&entry->data, runlevel)) {
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if (notified->mask & IN_CREATE)
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tty_start(&entry->data);
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else if (entry->data.pid)
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tty_stop(&entry->data);
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}
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}
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}
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PLUGIN_INIT(plugin_init)
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{
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setup();
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plugin_register(&plugin);
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}
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PLUGIN_EXIT(plugin_exit)
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{
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plugin_unregister(&plugin);
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}
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/**
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* Local Variables:
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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