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diff --git a/lib/common/watchdog.c b/lib/common/watchdog.c
index fc21f26437..1db29815b3 100644
--- a/lib/common/watchdog.c
+++ b/lib/common/watchdog.c
@@ -1,289 +1,289 @@
/*
* Copyright 2013-2024 the Pacemaker project contributors
*
* The version control history for this file may have further details.
*
* This source code is licensed under the GNU Lesser General Public License
* version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
*/
#include <crm_internal.h>
#include <sched.h>
#include <sys/ioctl.h>
#include <sys/reboot.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <ctype.h>
#include <dirent.h>
#include <signal.h>
static pid_t sbd_pid = 0;
/*!
* \internal
* \brief Tell pacemakerd to panic the local host
*
* \param[in] ppid Process ID of parent process
*/
static void
panic_local_nonroot(pid_t ppid)
{
if (ppid > 1) { // pacemakerd is still our parent
crm_emerg("Escalating panic to " PCMK__SERVER_PACEMAKERD "[%lld]",
(long long) ppid);
} else { // Signal (non-parent) pacemakerd if possible
ppid = pcmk__procfs_pid_of(PCMK__SERVER_PACEMAKERD);
if (ppid > 0) {
union sigval signal_value;
crm_emerg("Signaling " PCMK__SERVER_PACEMAKERD "[%lld] to panic",
(long long) ppid);
memset(&signal_value, 0, sizeof(signal_value));
if (sigqueue(ppid, SIGQUIT, signal_value) < 0) {
crm_emerg("Exiting after signal failure: %s", strerror(errno));
}
} else {
crm_emerg("Exiting with no known " PCMK__SERVER_PACEMAKERD
"process");
}
}
crm_exit(CRM_EX_PANIC);
}
/*!
* \internal
* \brief Panic the local host (if root) or tell pacemakerd to do so
*/
static void
panic_local(void)
{
const char *full_panic_action = pcmk__env_option(PCMK__ENV_PANIC_ACTION);
const char *panic_action = full_panic_action;
int reboot_cmd = RB_AUTOBOOT; // Default panic action is reboot
if (geteuid() != 0) { // Non-root caller such as the controller
panic_local_nonroot(getppid());
return;
}
if (pcmk__starts_with(full_panic_action, "sync-")) {
panic_action += sizeof("sync-") - 1;
sync();
}
if (pcmk__str_empty(full_panic_action)
|| pcmk__str_eq(panic_action, PCMK_VALUE_REBOOT, pcmk__str_none)) {
pcmk__sysrq_trigger('b');
} else if (pcmk__str_eq(panic_action, PCMK_VALUE_CRASH, pcmk__str_none)) {
pcmk__sysrq_trigger('c');
} else if (pcmk__str_eq(panic_action, PCMK_VALUE_OFF, pcmk__str_none)) {
pcmk__sysrq_trigger('o');
#ifdef RB_POWER_OFF
reboot_cmd = RB_POWER_OFF;
#elif defined(RB_POWEROFF)
reboot_cmd = RB_POWEROFF;
#endif
} else {
crm_warn("Using default '" PCMK_VALUE_REBOOT "' for local option PCMK_"
PCMK__ENV_PANIC_ACTION " because '%s' is not a valid value",
full_panic_action);
pcmk__sysrq_trigger('b');
}
// sysrq failed or is not supported on this platform, so fall back to reboot
reboot(reboot_cmd);
// Even reboot failed, nothing left to do but exit
crm_emerg("Exiting after reboot failed: %s", strerror(errno));
if (getppid() > 1) { // pacemakerd is parent process
crm_exit(CRM_EX_PANIC);
} else { // This is pacemakerd, or an orphaned subdaemon
crm_exit(CRM_EX_FATAL);
}
}
/*!
* \internal
* \brief Tell sbd to kill the local host, then exit
*/
static void
panic_sbd(void)
{
union sigval signal_value;
pid_t ppid = getppid();
memset(&signal_value, 0, sizeof(signal_value));
/* TODO: Arrange for a slightly less brutal option? */
if(sigqueue(sbd_pid, SIGKILL, signal_value) < 0) {
crm_emerg("Panicking directly because couldn't signal sbd");
panic_local();
}
if(ppid > 1) {
/* child daemon */
crm_exit(CRM_EX_PANIC);
} else {
/* pacemakerd or orphan child */
crm_exit(CRM_EX_FATAL);
}
}
/*!
* \internal
* \brief Panic the local host
*
* Panic the local host either by sbd (if running), directly, or by asking
* pacemakerd. If trace logging this function, exit instead.
*
* \param[in] reason Why panic is needed (for logging only)
*/
void
pcmk__panic(const char *reason)
{
if (pcmk__locate_sbd() > 1) {
crm_emerg("Signaling sbd[%lld] to panic the system: %s",
(long long) sbd_pid, reason);
panic_sbd();
} else {
crm_emerg("Panicking the system directly: %s", reason);
panic_local();
}
}
/*!
* \internal
* \brief Return the process ID of sbd (or 0 if it is not running)
*/
pid_t
pcmk__locate_sbd(void)
{
char *pidfile = NULL;
char *sbd_path = NULL;
int rc;
if(sbd_pid > 1) {
return sbd_pid;
}
/* Look for the pid file */
pidfile = crm_strdup_printf(PCMK__RUN_DIR "/sbd.pid");
sbd_path = crm_strdup_printf("%s/sbd", SBIN_DIR);
/* Read the pid file */
rc = pcmk__pidfile_matches(pidfile, 0, sbd_path, &sbd_pid);
if (rc == pcmk_rc_ok) {
crm_trace("SBD detected at pid %lld (via PID file %s)",
(long long) sbd_pid, pidfile);
-
-#if HAVE_LINUX_PROCFS
} else {
/* Fall back to /proc for systems that support it */
sbd_pid = pcmk__procfs_pid_of("sbd");
- crm_trace("SBD detected at pid %lld (via procfs)",
- (long long) sbd_pid);
-#endif // HAVE_LINUX_PROCFS
+
+ if (sbd_pid != 0) {
+ crm_trace("SBD detected at pid %lld (via procfs)",
+ (long long) sbd_pid);
+ }
}
if(sbd_pid < 0) {
sbd_pid = 0;
crm_trace("SBD not detected");
}
free(pidfile);
free(sbd_path);
return sbd_pid;
}
long
pcmk__get_sbd_watchdog_timeout(void)
{
static long sbd_timeout = -2;
if (sbd_timeout == -2) {
sbd_timeout = crm_get_msec(getenv("SBD_WATCHDOG_TIMEOUT"));
}
return sbd_timeout;
}
bool
pcmk__get_sbd_sync_resource_startup(void)
{
static int sync_resource_startup = PCMK__SBD_SYNC_DEFAULT;
static bool checked_sync_resource_startup = false;
if (!checked_sync_resource_startup) {
const char *sync_env = getenv("SBD_SYNC_RESOURCE_STARTUP");
if (sync_env == NULL) {
crm_trace("Defaulting to %sstart-up synchronization with sbd",
(PCMK__SBD_SYNC_DEFAULT? "" : "no "));
} else if (crm_str_to_boolean(sync_env, &sync_resource_startup) < 0) {
crm_warn("Defaulting to %sstart-up synchronization with sbd "
"because environment value '%s' is invalid",
(PCMK__SBD_SYNC_DEFAULT? "" : "no "), sync_env);
}
checked_sync_resource_startup = true;
}
return sync_resource_startup != 0;
}
long
pcmk__auto_stonith_watchdog_timeout(void)
{
long sbd_timeout = pcmk__get_sbd_watchdog_timeout();
return (sbd_timeout <= 0)? 0 : (2 * sbd_timeout);
}
bool
pcmk__valid_stonith_watchdog_timeout(const char *value)
{
/* @COMPAT At a compatibility break, accept either negative values or a
* specific string like "auto" (but not both) to mean "auto-calculate the
* timeout." Reject other values that aren't parsable as timeouts.
*/
long st_timeout = value? crm_get_msec(value) : 0;
if (st_timeout < 0) {
st_timeout = pcmk__auto_stonith_watchdog_timeout();
crm_debug("Using calculated value %ld for "
PCMK_OPT_STONITH_WATCHDOG_TIMEOUT " (%s)",
st_timeout, value);
}
if (st_timeout == 0) {
crm_debug("Watchdog may be enabled but "
PCMK_OPT_STONITH_WATCHDOG_TIMEOUT " is disabled (%s)",
value? value : "default");
} else if (pcmk__locate_sbd() == 0) {
crm_emerg("Shutting down: " PCMK_OPT_STONITH_WATCHDOG_TIMEOUT
" configured (%s) but SBD not active",
pcmk__s(value, "auto"));
crm_exit(CRM_EX_FATAL);
return false;
} else {
long sbd_timeout = pcmk__get_sbd_watchdog_timeout();
if (st_timeout < sbd_timeout) {
crm_emerg("Shutting down: " PCMK_OPT_STONITH_WATCHDOG_TIMEOUT
" (%s) too short (must be >%ldms)",
value, sbd_timeout);
crm_exit(CRM_EX_FATAL);
return false;
}
crm_info("Watchdog configured with " PCMK_OPT_STONITH_WATCHDOG_TIMEOUT
" %s and SBD timeout %ldms",
value, sbd_timeout);
}
return true;
}

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