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-rw-r--r--lib/monotonic.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/lib/monotonic.c b/lib/monotonic.c
new file mode 100644
index 0000000..f0aeba6
--- /dev/null
+++ b/lib/monotonic.c
@@ -0,0 +1,81 @@
+/*
+ * Please, don't add this file to libcommon because clock_gettime() requires
+ * -lrt on systems with old libc.
+ *
+ * No copyright is claimed. This code is in the public domain; do with
+ * it what you wish.
+ */
+#include <time.h>
+#include <signal.h>
+#ifdef HAVE_SYSINFO
+#include <sys/sysinfo.h>
+#endif
+#include <sys/time.h>
+
+#include "c.h"
+#include "monotonic.h"
+
+int get_boot_time(struct timeval *boot_time)
+{
+#ifdef CLOCK_BOOTTIME
+ struct timespec hires_uptime;
+ struct timeval lores_uptime;
+#endif
+ struct timeval now;
+#ifdef HAVE_SYSINFO
+ struct sysinfo info;
+#endif
+
+ if (gettimeofday(&now, NULL) != 0)
+ return -errno;
+#ifdef CLOCK_BOOTTIME
+ if (clock_gettime(CLOCK_BOOTTIME, &hires_uptime) == 0) {
+ TIMESPEC_TO_TIMEVAL(&lores_uptime, &hires_uptime);
+ timersub(&now, &lores_uptime, boot_time);
+ return 0;
+ }
+#endif
+#ifdef HAVE_SYSINFO
+ /* fallback */
+ if (sysinfo(&info) != 0)
+ return -errno;
+
+ boot_time->tv_sec = now.tv_sec - info.uptime;
+ boot_time->tv_usec = 0;
+ return 0;
+#else
+ return -ENOSYS;
+#endif
+}
+
+time_t get_suspended_time(void)
+{
+#if defined(CLOCK_BOOTTIME) && defined(CLOCK_MONOTONIC)
+ struct timespec boot, mono;
+
+ if (clock_gettime(CLOCK_BOOTTIME, &boot) == 0 &&
+ clock_gettime(CLOCK_MONOTONIC, &mono) == 0)
+ return boot.tv_sec - mono.tv_sec;
+#endif
+ return 0;
+}
+
+int gettime_monotonic(struct timeval *tv)
+{
+#ifdef CLOCK_MONOTONIC
+ /* Can slew only by ntp and adjtime */
+ int ret;
+ struct timespec ts;
+
+ /* Linux specific, can't slew */
+ if (!(ret = clock_gettime(UL_CLOCK_MONOTONIC, &ts))) {
+ tv->tv_sec = ts.tv_sec;
+ tv->tv_usec = ts.tv_nsec / 1000;
+ }
+ return ret;
+#else
+ return gettimeofday(tv, NULL);
+#endif
+}
+
+