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- #include <linux/watchdog.h>
- #include <sys/ioctl.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <fcntl.h>
- #include <unistd.h>
- #include <libubox/uloop.h>
- #include "procd.h"
- #include "watchdog.h"
- #define WDT_PATH "/dev/watchdog"
- static struct uloop_timeout wdt_timeout;
- static int wdt_fd = -1;
- static int wdt_drv_timeout = 30;
- static int wdt_frequency = 5;
- static bool wdt_magicclose = false;
- void watchdog_ping(void)
- {
- DEBUG(4, "Ping\n");
- if (wdt_fd >= 0 && write(wdt_fd, "X", 1) < 0)
- ERROR("WDT failed to write: %m\n");
- }
- static void watchdog_timeout_cb(struct uloop_timeout *t)
- {
- watchdog_ping();
- uloop_timeout_set(t, wdt_frequency * 1000);
- }
- static int watchdog_open(bool cloexec)
- {
- char *env = getenv("WDTFD");
- if (wdt_fd >= 0)
- return wdt_fd;
- if (env) {
- DEBUG(2, "Watchdog handover: fd=%s\n", env);
- wdt_fd = atoi(env);
- unsetenv("WDTFD");
- } else {
- wdt_fd = open(WDT_PATH, O_WRONLY);
- }
- if (wdt_fd < 0)
- return wdt_fd;
- if (cloexec)
- fcntl(wdt_fd, F_SETFD, fcntl(wdt_fd, F_GETFD) | FD_CLOEXEC);
- return wdt_fd;
- }
- static void watchdog_close(bool with_release)
- {
- if (wdt_fd < 0)
- return;
- if (with_release) {
- if (write(wdt_fd, "V", 1) < 0)
- ERROR("WDT failed to write release: %m\n");
- }
- if (close(wdt_fd) == -1)
- ERROR("WDT failed to close watchdog: %m\n");
- wdt_fd = -1;
- }
- static int watchdog_set_drv_timeout(void)
- {
- if (wdt_fd < 0)
- return -1;
- return ioctl(wdt_fd, WDIOC_SETTIMEOUT, &wdt_drv_timeout);
- }
- static void watchdog_print_status(void)
- {
- struct watchdog_info wdt_info;
- int bootstatus;
- if (wdt_fd < 0)
- return;
- if (ioctl(wdt_fd, WDIOC_GETSUPPORT, &wdt_info)) {
- DEBUG(2, "Watchdog GETSUPPORT failed\n");
- return;
- }
- if (!(wdt_info.options & WDIOF_CARDRESET)) {
- DEBUG(2, "Watchdog does not have CARDRESET support\n");
- return;
- }
- if (ioctl(wdt_fd, WDIOC_GETBOOTSTATUS, &bootstatus)) {
- DEBUG(2, "Watchdog GETBOOTSTATUS failed\n");
- return;
- }
- if (bootstatus & WDIOF_CARDRESET)
- LOG("Watchdog has previously reset the system\n");
- else
- DEBUG(2, "Watchdog did not previously reset the system\n");
- }
- void watchdog_set_magicclose(bool val)
- {
- wdt_magicclose = val;
- }
- bool watchdog_get_magicclose(void)
- {
- return wdt_magicclose;
- }
- void watchdog_set_stopped(bool val)
- {
- if (val) {
- uloop_timeout_cancel(&wdt_timeout);
- watchdog_close(wdt_magicclose);
- }
- else {
- watchdog_open(true);
- watchdog_set_drv_timeout();
- watchdog_timeout_cb(&wdt_timeout);
- }
- }
- bool watchdog_get_stopped(void)
- {
- return !wdt_timeout.pending;
- }
- int watchdog_timeout(int timeout)
- {
- if (timeout) {
- DEBUG(4, "Set watchdog timeout: %ds\n", timeout);
- wdt_drv_timeout = timeout;
- if (wdt_fd >= 0)
- watchdog_set_drv_timeout();
- }
- return wdt_drv_timeout;
- }
- int watchdog_frequency(int frequency)
- {
- if (frequency) {
- DEBUG(4, "Set watchdog frequency: %ds\n", frequency);
- wdt_frequency = frequency;
- }
- return wdt_frequency;
- }
- char* watchdog_fd(void)
- {
- static char fd_buf[12];
- if (wdt_fd < 0)
- return NULL;
- snprintf(fd_buf, sizeof(fd_buf), "%d", wdt_fd);
- return fd_buf;
- }
- void watchdog_init(int preinit)
- {
- wdt_timeout.cb = watchdog_timeout_cb;
- if (watchdog_open(!preinit) < 0)
- return;
- LOG("- watchdog -\n");
- watchdog_set_drv_timeout();
- watchdog_timeout_cb(&wdt_timeout);
- DEBUG(4, "Opened watchdog with timeout %ds\n", watchdog_timeout(0));
- watchdog_print_status();
- }
- void watchdog_set_cloexec(bool val)
- {
- if (wdt_fd < 0)
- return;
- int flags = fcntl(wdt_fd, F_GETFD);
- if (val)
- flags |= FD_CLOEXEC;
- else
- flags &= ~FD_CLOEXEC;
- fcntl(wdt_fd, F_SETFD, flags);
- }
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