mirror of
https://github.com/troglobit/finit.git
synced 2026-10-01 21:42:40 +07:00
Mattias Walström
5961748b2a
This also adds support for monitor /dev for TTYs appering after boot, USB-to-serial converters for example. Some limitations: Baudrate (and other settings) is hardcoded for now, should be read from config file.
139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
/* TTY handling in finit
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*
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* Copyright (c) 2013 Mattias Walström <lazzer@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 <sys/inotify.h>
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#include <signal.h>
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#include <sys/prctl.h>
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#include <sys/wait.h>
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#include "queue.h"
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#include "finit.h"
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#include "helpers.h"
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#include "lite.h"
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typedef struct finit_tty_t {
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char *name;
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int baud;
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int pid; /* Runtime information*/
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} finit_tty_t;
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typedef struct node {
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LIST_ENTRY(node) link;
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finit_tty_t data;
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} node_t;
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/* We need to make room for the filename also, which is sent after inotify_event. */
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#define EVENT_SIZE ((sizeof(struct inotify_event) + FILENAME_MAX))
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LIST_HEAD(, node) node_list = LIST_HEAD_INITIALIZER();
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int tty_add(char *tty, int baud)
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{
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node_t *entry = malloc(sizeof(*entry));
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if (!entry)
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return errno = ENOMEM;
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entry->data.name = tty;
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entry->data.baud = baud;
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LIST_INSERT_HEAD(&node_list, entry, link);
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return 0;
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}
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static void tty_startstop_one(finit_tty_t *tty, uint32_t mask)
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{
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char cmd[strlen(GETTY)+FILENAME_MAX];
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if (mask & IN_CREATE) {
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_d("Starting %s as %s", tty->name, (strcmp(tty->name, console) == 0) ? "console" : "TTY");
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snprintf(cmd, sizeof(cmd), GETTY, tty->name);
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tty->pid = run_getty(cmd, strcmp(tty->name, console) == 0);
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}
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/* Kill the spawned child, and recollect it. */
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if ((mask & IN_DELETE) && tty->pid) {
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int status = 0;
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_d("Stopping %s", tty->name);
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kill(tty->pid, SIGKILL);
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waitpid(tty->pid, &status, 0);
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tty->pid = 0;
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}
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}
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void tty_start(void)
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{
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int fd = -1;
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node_t *entry;
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/* Start all TTYs that already exist in the system. */
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LIST_FOREACH(entry, &node_list, link) {
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chdir("/dev");
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if (fexist (entry->data.name))
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tty_startstop_one(&entry->data, IN_CREATE);
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}
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/* Start a inotify watcher to catch new TTYs that is discovered (USB for example) */
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if (!fork()) {
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fd = inotify_init();
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prctl(PR_SET_NAME, "tty_watcher", 0, 0, 0);
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if (inotify_add_watch(fd, "/dev", IN_CREATE | IN_DELETE) < 0) {
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fprintf(stderr, "Failed to add watcher, errno %s\n", strerror(errno));
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return;
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}
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while (1) {
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int len = 0;;
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char buf[EVENT_SIZE];
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struct inotify_event *notified;
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while ((len = read(fd, buf, EVENT_SIZE))) {
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if (len == -1) {
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if (errno == EAGAIN || errno == EINTR)
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continue;
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}
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notified = (struct inotify_event *) &buf[0];
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LIST_FOREACH(entry, &node_list, link) {
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if (strcmp(notified->name, entry->data.name) == 0) {
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tty_startstop_one(&entry->data, notified->mask);
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}
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}
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}
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}
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exit(0);
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}
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}
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/**
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* Local Variables:
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* version-control: t
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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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