2fa4092c28
Instead of outputting "5h 55s 50ms 3us" we'll now output "5h 55.050003s". Also, while outputting the accuracy is configurable. Basically we now try use "dot notation" for all time values > 1min. For >= 1s we use 's' as unit, otherwise for >= 1ms we use 'ms' as unit, and finally 'us'. This should give reasonably values in most cases.
170 lines
4.9 KiB
C
170 lines
4.9 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <linux/watchdog.h>
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#include "watchdog.h"
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#include "log.h"
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static int watchdog_fd = -1;
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static usec_t watchdog_timeout = (usec_t) -1;
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static int update_timeout(void) {
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int r;
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if (watchdog_fd < 0)
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return 0;
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if (watchdog_timeout == (usec_t) -1)
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return 0;
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else if (watchdog_timeout == 0) {
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int flags;
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flags = WDIOS_DISABLECARD;
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r = ioctl(watchdog_fd, WDIOC_SETOPTIONS, &flags);
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if (r < 0) {
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log_warning("Failed to disable hardware watchdog: %m");
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return -errno;
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}
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} else {
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int sec, flags;
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char buf[FORMAT_TIMESPAN_MAX];
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sec = (int) ((watchdog_timeout + USEC_PER_SEC - 1) / USEC_PER_SEC);
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r = ioctl(watchdog_fd, WDIOC_SETTIMEOUT, &sec);
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if (r < 0) {
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log_warning("Failed to set timeout to %is: %m", sec);
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return -errno;
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}
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watchdog_timeout = (usec_t) sec * USEC_PER_SEC;
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log_info("Set hardware watchdog to %s.", format_timespan(buf, sizeof(buf), watchdog_timeout, 0));
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flags = WDIOS_ENABLECARD;
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r = ioctl(watchdog_fd, WDIOC_SETOPTIONS, &flags);
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if (r < 0) {
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log_warning("Failed to enable hardware watchdog: %m");
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return -errno;
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}
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r = ioctl(watchdog_fd, WDIOC_KEEPALIVE, 0);
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if (r < 0) {
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log_warning("Failed to ping hardware watchdog: %m");
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return -errno;
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}
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}
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return 0;
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}
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static int open_watchdog(void) {
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struct watchdog_info ident;
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if (watchdog_fd >= 0)
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return 0;
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watchdog_fd = open("/dev/watchdog", O_WRONLY|O_CLOEXEC);
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if (watchdog_fd < 0)
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return -errno;
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if (ioctl(watchdog_fd, WDIOC_GETSUPPORT, &ident) >= 0)
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log_info("Hardware watchdog '%s', version %x",
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ident.identity,
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ident.firmware_version);
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return update_timeout();
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}
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int watchdog_set_timeout(usec_t *usec) {
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int r;
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watchdog_timeout = *usec;
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/* If we didn't open the watchdog yet and didn't get any
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* explicit timeout value set, don't do anything */
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if (watchdog_fd < 0 && watchdog_timeout == (usec_t) -1)
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return 0;
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if (watchdog_fd < 0)
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r = open_watchdog();
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else
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r = update_timeout();
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*usec = watchdog_timeout;
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return r;
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}
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int watchdog_ping(void) {
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int r;
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if (watchdog_fd < 0) {
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r = open_watchdog();
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if (r < 0)
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return r;
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}
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r = ioctl(watchdog_fd, WDIOC_KEEPALIVE, 0);
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if (r < 0) {
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log_warning("Failed to ping hardware watchdog: %m");
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return -errno;
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}
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return 0;
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}
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void watchdog_close(bool disarm) {
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int r;
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if (watchdog_fd < 0)
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return;
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if (disarm) {
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int flags;
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/* Explicitly disarm it */
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flags = WDIOS_DISABLECARD;
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r = ioctl(watchdog_fd, WDIOC_SETOPTIONS, &flags);
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if (r < 0)
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log_warning("Failed to disable hardware watchdog: %m");
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/* To be sure, use magic close logic, too */
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for (;;) {
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static const char v = 'V';
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if (write(watchdog_fd, &v, 1) > 0)
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break;
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if (errno != EINTR) {
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log_error("Failed to disarm watchdog timer: %m");
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break;
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}
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}
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}
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close_nointr_nofail(watchdog_fd);
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watchdog_fd = -1;
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}
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