mirror of
https://github.com/troglobit/finit.git
synced 2026-10-01 05:22:48 +07:00
Tobias Waldekranz
e84333662e
Since the modprobe plugin (unsurpricingly) may cause new modules to be loaded, it makes sense to to delay the initial device node scan until we know that no mode nodes will show up within the next few microseconds.
117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
/* Heuristically find and initialize a suitable hotplug daemon
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*
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* Copyright (c) 2012-2022 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 <stdio.h>
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#include "config.h"
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#include "conf.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 "service.h"
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static void setup(void *arg)
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{
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char cmd[256];
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char *path;
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if (rescue) {
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_d("Skipping %s plugin in rescue mode.", __FILE__);
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return;
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}
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/*
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* Populate /dev and prepare for runtime events from kernel.
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* Prefer udev if mdev is also available on the system.
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*/
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path = which("udevd");
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if (!path)
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path = which("/lib/systemd/systemd-udevd");
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if (path) {
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/* Register udevd as a monitored service */
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snprintf(cmd, sizeof(cmd), "[S12345789] cgroup.system pid:udevd name:udevd log %s "
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"-- Device event managing daemon", path);
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if (service_register(SVC_TYPE_SERVICE, cmd, global_rlimit, NULL)) {
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_pe("Failed registering %s", path);
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} else {
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snprintf(cmd, sizeof(cmd), "cgroup.init :1 [S] <pid/udevd> log "
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"udevadm trigger -c add -t devices "
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"-- Requesting device events");
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service_register(SVC_TYPE_RUN, cmd, global_rlimit, NULL);
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snprintf(cmd, sizeof(cmd), "cgroup.init :2 [S] <pid/udevd> log "
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"udevadm trigger -c add -t subsystems "
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"-- Requesting subsystem events");
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service_register(SVC_TYPE_RUN, cmd, global_rlimit, NULL);
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}
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free(path);
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/* Debian has this little script to copy generated
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* rules while the system was read-only. TODO: When
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* this functionality was hardcoded in finit.c, this
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* call was made in crank_worker(). Now that
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* filesystems are mounted earlier we should be able
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* to make this call directly after the triggers have
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* run, but this has not been tested AT ALL. */
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if (fexist("/lib/udev/udev-finish"))
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run_interactive("/lib/udev/udev-finish", "Finalizing udev");
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} else {
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path = which("mdev");
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if (path) {
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/* Embedded Linux systems usually have BusyBox mdev */
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if (debug)
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touch("/dev/mdev.log");
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snprintf(cmd, sizeof(cmd), "%s -s", path);
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free(path);
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run_interactive(cmd, "Populating device tree");
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}
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}
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}
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static plugin_t plugin = {
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.name = __FILE__,
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.hook[HOOK_BASEFS_UP] = {
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.cb = setup
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},
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.depends = { "bootmisc", "modprobe" },
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};
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PLUGIN_INIT(plugin_init)
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{
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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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