[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)
{
#ifdef CLOCK_BOOTTIME
	struct timespec hires_uptime;
	struct timeval lores_uptime;
#endif
	struct timeval 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	{
60cb2c37	12	#ifdef CLOCK_BOOTTIME
2c5484f7	13	struct timespec hires_uptime;
60cb2c37 RM	14	struct timeval lores_uptime;
	15	#endif
	16	struct timeval now;
2c5484f7 KZ	17	struct sysinfo info;
	18
	19	if (gettimeofday(&now, NULL) != 0) {
	20	warn(_("gettimeofday failed"));
	21	return -errno;
	22	}
	23	#ifdef CLOCK_BOOTTIME
	24	if (clock_gettime(CLOCK_BOOTTIME, &hires_uptime) == 0) {
	25	TIMESPEC_TO_TIMEVAL(&lores_uptime, &hires_uptime);
	26	timersub(&now, &lores_uptime, boot_time);
	27	return 0;
	28	}
	29	#endif
	30	/* fallback */
	31	if (sysinfo(&info) != 0)
	32	warn(_("sysinfo failed"));
	33
	34	boot_time->tv_sec = now.tv_sec - info.uptime;
	35	boot_time->tv_usec = 0;
	36	return 0;
	37	}