[thirdparty/util-linux.git] / lib / boottime.c


#include <time.h>
#include <sys/sysinfo.h>
#include <sys/time.h>

#include "c.h"
#include "nls.h"
#include "boottime.h"

int get_boot_time(struct timeval *boot_time)
{
	struct timespec hires_uptime;
	struct timeval lores_uptime, now;
	struct sysinfo info;

	if (gettimeofday(&now, NULL) != 0) {
		warn(_("gettimeofday failed"));
		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
	/* fallback */
	if (sysinfo(&info) != 0)
		warn(_("sysinfo failed"));

	boot_time->tv_sec = now.tv_sec - info.uptime;
	boot_time->tv_usec = 0;
	return 0;
}
Commit	Line	Data
2c5484f7 KZ	1
	2	#include <time.h>
	3	#include <sys/sysinfo.h>
	4	#include <sys/time.h>
	5
	6	#include "c.h"
	7	#include "nls.h"
	8	#include "boottime.h"
	9
	10	int get_boot_time(struct timeval *boot_time)
	11	{
	12	struct timespec hires_uptime;
	13	struct timeval lores_uptime, now;
	14	struct sysinfo info;
	15
	16	if (gettimeofday(&now, NULL) != 0) {
	17	warn(_("gettimeofday failed"));
	18	return -errno;
	19	}
	20	#ifdef CLOCK_BOOTTIME
	21	if (clock_gettime(CLOCK_BOOTTIME, &hires_uptime) == 0) {
	22	TIMESPEC_TO_TIMEVAL(&lores_uptime, &hires_uptime);
	23	timersub(&now, &lores_uptime, boot_time);
	24	return 0;
	25	}
	26	#endif
	27	/* fallback */
	28	if (sysinfo(&info) != 0)
	29	warn(_("sysinfo failed"));
	30
	31	boot_time->tv_sec = now.tv_sec - info.uptime;
	32	boot_time->tv_usec = 0;
	33	return 0;
	34	}