shaba/systemd-stable
1
1
Fork 0
mirror of https://github.com/systemd/systemd-stable.git synced 2024-10-26 08:55:18 +03:00
Code

watchdog: always prefer /dev/watchdog0 over /dev/watchdog

Browse Source
This commit is contained in:
Lennart Poettering 2021-10-18 11:21:42 +02:00
parent a73b7b1b0e
commit 59bcac0b1a
2 changed files with 10 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
man/systemd-system.conf.xml
View File

@ -144,7 +144,7 @@
depending on hardware capabilities).</para>
<para>If <varname>RuntimeWatchdogSec=</varname> is set to a non-zero value, the watchdog hardware
(<filename>/dev/watchdog</filename> or the path specified with <varname>WatchdogDevice=</varname> or
(<filename>/dev/watchdog0</filename> or the path specified with <varname>WatchdogDevice=</varname> or
the kernel option <varname>systemd.watchdog-device=</varname>) will be programmed to automatically
reboot the system if it is not contacted within the specified timeout interval. The system manager
will ensure to contact it at least once in half the specified timeout interval. This feature requires
@ -182,7 +182,7 @@
<listitem><para>Configure the hardware watchdog device that the
runtime and shutdown watchdog timers will open and use. Defaults
to <filename>/dev/watchdog</filename>. This setting has no
to <filename>/dev/watchdog0</filename>. This setting has no
effect if a hardware watchdog is not available.</para></listitem>
</varlistentry>

9
src/shared/watchdog.c
View File

@ -10,6 +10,7 @@
#include "errno-util.h"
#include "fd-util.h"
#include "log.h"
#include "path-util.h"
#include "string-util.h"
#include "time-util.h"
#include "watchdog.h"
@ -127,7 +128,13 @@ static int open_watchdog(void) {
if (watchdog_fd >= 0)
return 0;
fn = watchdog_device ?: "/dev/watchdog";
/* Let's prefer new-style /dev/watchdog0 (i.e. kernel 3.5+) over classic /dev/watchdog. The former
* has the benefit that we can easily find the matching directory in sysfs from it, as the relevant
* sysfs attributes can only be found via /sys/dev/char/<major>:<minor> if the new-style device
* major/minor is used, not the old-style. */
fn = !watchdog_device || path_equal(watchdog_device, "/dev/watchdog") ?
"/dev/watchdog0" : watchdog_device;
watchdog_fd = open(fn, O_WRONLY|O_CLOEXEC);
if (watchdog_fd < 0)
return log_debug_errno(errno, "Failed to open watchdog device %s, ignoring: %m", fn);