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/* Optional TTY Watcher, used to catch new TTYs that are discovered, e.g., USB
*
* Copyright (c) 2013 Mattias Walström <lazzer@gmail.com>
* Copyright (c) 2013-2025 Joachim Wiberg <troglobit@gmail.com>
*
* 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.
*/
#include <errno.h>
#include <fcntl.h> /* O_RDONLY et al */
#include <unistd.h> /* read() */
#include <sys/inotify.h>
#include <sys/stat.h>
#ifdef _LIBITE_LITE
# include <libite/lite.h>
#else
# include <lite/lite.h>
#endif
#include "finit.h"
#include "helpers.h"
#include "plugin.h"
#include "service.h"
#include "tty.h"
#include "log.h"
static void tty_watcher(void *arg, int fd, int events);
static plugin_t plugin = {
.io = {
.cb = tty_watcher,
.flags = PLUGIN_IO_READ,
},
};
static void setup(void)
{
if (plugin.io.fd > 0)
close(plugin.io.fd);
plugin.io.fd = inotify_init1(IN_NONBLOCK | IN_CLOEXEC);
if (-1 == plugin.io.fd || inotify_add_watch(plugin.io.fd, "/dev", IN_CREATE | IN_DELETE) < 0)
err(1, "Failed starting TTY watcher");
}
static void do_tty(char *tty, size_t len, int creat)
{
char name[len + 6];
svc_t *svc;
snprintf(name, sizeof(name), "/dev/%s", tty);
svc = svc_find_by_tty(name);
if (svc) {
if (svc_is_blocked(svc) && creat) {
dbg("%s: blocked, re-enabling", svc_ident(svc, NULL, 0));
svc_start(svc);
} else if (svc->pid) {
dbg("%s: missing ...", svc_ident(svc, NULL, 0));
svc_missing(svc);
}
service_step_all(SVC_TYPE_TTY);
}
}
static void tty_watcher(void *arg, int fd, int events)
{
static char ev_buf[8 *(sizeof(struct inotify_event) + NAME_MAX + 1) + 1];
struct inotify_event *ev;
ssize_t sz;
size_t off;
sz = read(fd, ev_buf, sizeof(ev_buf) - 1);
if (sz <= 0) {
err(1, "invalid inotify event");
return;
}
ev_buf[sz] = 0;
for (off = 0; off < (size_t)sz; off += sizeof(*ev) + ev->len) {
if (off + sizeof(*ev) > (size_t)sz)
break;
ev = (struct inotify_event *)&ev_buf[off];
if (off + sizeof(*ev) + ev->len > (size_t)sz)
break;
if (!ev->mask)
continue;
dbg("tty %s, event: 0x%08x", ev->name, ev->mask);
do_tty(ev->name, ev->len, ev->mask & IN_CREATE);
}
}
PLUGIN_INIT(__init)
{
setup();
plugin_register(&plugin);
}
PLUGIN_EXIT(__exit)
{
plugin_unregister(&plugin);
if (plugin.io.fd)
close(plugin.io.fd);
}
/**
* Local Variables:
* indent-tabs-mode: t
* c-file-style: "linux"
* End:
*/
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