diff options
Diffstat (limited to 'src/shared/watchdog.c')
| -rw-r--r-- | src/shared/watchdog.c | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/src/shared/watchdog.c b/src/shared/watchdog.c deleted file mode 100644 index 13265e7692..0000000000 --- a/src/shared/watchdog.c +++ /dev/null @@ -1,169 +0,0 @@ -/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ - -/*** - This file is part of systemd. - - Copyright 2012 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#include <sys/ioctl.h> -#include <errno.h> -#include <fcntl.h> -#include <unistd.h> -#include <linux/watchdog.h> - -#include "watchdog.h" -#include "log.h" - -static int watchdog_fd = -1; -static usec_t watchdog_timeout = (usec_t) -1; - -static int update_timeout(void) { - int r; - - if (watchdog_fd < 0) - return 0; - - if (watchdog_timeout == (usec_t) -1) - return 0; - else if (watchdog_timeout == 0) { - int flags; - - flags = WDIOS_DISABLECARD; - r = ioctl(watchdog_fd, WDIOC_SETOPTIONS, &flags); - if (r < 0) { - log_warning("Failed to disable hardware watchdog: %m"); - return -errno; - } - } else { - int sec, flags; - char buf[FORMAT_TIMESPAN_MAX]; - - sec = (int) ((watchdog_timeout + USEC_PER_SEC - 1) / USEC_PER_SEC); - r = ioctl(watchdog_fd, WDIOC_SETTIMEOUT, &sec); - if (r < 0) { - log_warning("Failed to set timeout to %is: %m", sec); - return -errno; - } - - watchdog_timeout = (usec_t) sec * USEC_PER_SEC; - log_info("Set hardware watchdog to %s.", format_timespan(buf, sizeof(buf), watchdog_timeout)); - - flags = WDIOS_ENABLECARD; - r = ioctl(watchdog_fd, WDIOC_SETOPTIONS, &flags); - if (r < 0) { - log_warning("Failed to enable hardware watchdog: %m"); - return -errno; - } - - r = ioctl(watchdog_fd, WDIOC_KEEPALIVE, 0); - if (r < 0) { - log_warning("Failed to ping hardware watchdog: %m"); - return -errno; - } - } - - return 0; -} - -static int open_watchdog(void) { - struct watchdog_info ident; - - if (watchdog_fd >= 0) - return 0; - - watchdog_fd = open("/dev/watchdog", O_WRONLY|O_CLOEXEC); - if (watchdog_fd < 0) - return -errno; - - if (ioctl(watchdog_fd, WDIOC_GETSUPPORT, &ident) >= 0) - log_info("Hardware watchdog '%s', version %x", - ident.identity, - ident.firmware_version); - - return update_timeout(); -} - -int watchdog_set_timeout(usec_t *usec) { - int r; - - watchdog_timeout = *usec; - - /* If we didn't open the watchdog yet and didn't get any - * explicit timeout value set, don't do anything */ - if (watchdog_fd < 0 && watchdog_timeout == (usec_t) -1) - return 0; - - if (watchdog_fd < 0) - r = open_watchdog(); - else - r = update_timeout(); - - *usec = watchdog_timeout; - - return r; -} - -int watchdog_ping(void) { - int r; - - if (watchdog_fd < 0) { - r = open_watchdog(); - if (r < 0) - return r; - } - - r = ioctl(watchdog_fd, WDIOC_KEEPALIVE, 0); - if (r < 0) { - log_warning("Failed to ping hardware watchdog: %m"); - return -errno; - } - - return 0; -} - -void watchdog_close(bool disarm) { - int r; - - if (watchdog_fd < 0) - return; - - if (disarm) { - int flags; - - /* Explicitly disarm it */ - flags = WDIOS_DISABLECARD; - r = ioctl(watchdog_fd, WDIOC_SETOPTIONS, &flags); - if (r < 0) - log_warning("Failed to disable hardware watchdog: %m"); - - /* To be sure, use magic close logic, too */ - for (;;) { - static const char v = 'V'; - - if (write(watchdog_fd, &v, 1) > 0) - break; - - if (errno != EINTR) { - log_error("Failed to disarm watchdog timer: %m"); - break; - } - } - } - - close_nointr_nofail(watchdog_fd); - watchdog_fd = -1; -} |