mirror of
https://github.com/troglobit/finit.git
synced 2026-10-01 05:22:48 +07:00
Joachim Wiberg
ecaf111a4b
This is a major refactor to use the same construct as in the pidfile.so plugin to parse kernel inotify events for when TTYs are added removed from the system. Found by Coverity Scan. Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
120 lines
3.1 KiB
C
120 lines
3.1 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) 2013-2021 Joachim Wiberg <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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.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 > 0)
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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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_pe("Failed starting TTY watcher");
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}
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static void do_tty(char *tty, size_t len, int creat)
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{
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char name[len + 6];
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struct tty *entry;
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snprintf(name, sizeof(name), "/dev/%s", tty);
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entry = tty_find(name);
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if (entry && tty_enabled(entry)) {
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if (creat)
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tty_start(entry);
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else if (entry->pid)
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tty_stop(entry);
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}
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}
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static void watcher(void *arg, int fd, int events)
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{
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static char ev_buf[8 *(sizeof(struct inotify_event) + NAME_MAX + 1) + 1];
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struct inotify_event *ev;
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ssize_t sz, off;
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sz = read(fd, ev_buf, sizeof(ev_buf) - 1);
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if (sz <= 0) {
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_pe("invalid inotify event");
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return;
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}
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ev_buf[sz] = 0;
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for (off = 0; off < sz; off += sizeof(*ev) + ev->len) {
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if (off + sizeof(*ev) >= sizeof(ev_buf))
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break;
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ev = (struct inotify_event *)&ev_buf[off];
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if (off + sizeof(*ev) + ev->len >= sizeof(ev_buf))
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break;
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if (!ev->mask)
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continue;
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_d("tty %s, event: 0x%08x", ev->name, ev->mask);
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do_tty(ev->name, ev->len, ev->mask & IN_CREATE);
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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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if (plugin.io.fd)
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close(plugin.io.fd);
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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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