mirror of
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130 lines
3.3 KiB
C
130 lines
3.3 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) 2013-2023 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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#ifdef _LIBITE_LITE
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# include <libite/lite.h>
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#else
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# include <lite/lite.h>
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#endif
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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 "service.h"
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#include "tty.h"
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static void tty_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 = tty_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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err(1, "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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svc_t *svc;
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snprintf(name, sizeof(name), "/dev/%s", tty);
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svc = svc_find_by_tty(name);
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if (svc) {
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if (svc_is_blocked(svc) && creat) {
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dbg("%s: blocked, re-enabling", svc_ident(svc, NULL, 0));
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svc_start(svc);
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} else if (svc->pid) {
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dbg("%s: missing ...", svc_ident(svc, NULL, 0));
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svc_missing(svc);
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}
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service_step_all(SVC_TYPE_TTY);
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}
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}
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static void tty_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;
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size_t 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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err(1, "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 < (size_t)sz; off += sizeof(*ev) + ev->len) {
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if (off + sizeof(*ev) > (size_t)sz)
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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 > (size_t)sz)
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break;
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if (!ev->mask)
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continue;
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dbg("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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plugin_unregister(&plugin);
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if (plugin.io.fd)
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close(plugin.io.fd);
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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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