[net-next-2.6.git] / include / linux / time.h

#ifndef _LINUX_TIME_H
#define _LINUX_TIME_H

#include <linux/types.h>

#ifdef __KERNEL__
# include <linux/cache.h>
# include <linux/seqlock.h>
# include <linux/math64.h>
#endif

#ifndef _STRUCT_TIMESPEC
#define _STRUCT_TIMESPEC
struct timespec {
	__kernel_time_t	tv_sec;			/* seconds */
	long		tv_nsec;		/* nanoseconds */
};
#endif

struct timeval {
	__kernel_time_t		tv_sec;		/* seconds */
	__kernel_suseconds_t	tv_usec;	/* microseconds */
};

struct timezone {
	int	tz_minuteswest;	/* minutes west of Greenwich */
	int	tz_dsttime;	/* type of dst correction */
};

#ifdef __KERNEL__

extern struct timezone sys_tz;

/* Parameters used to convert the timespec values: */
#define MSEC_PER_SEC	1000L
#define USEC_PER_MSEC	1000L
#define NSEC_PER_USEC	1000L
#define NSEC_PER_MSEC	1000000L
#define USEC_PER_SEC	1000000L
#define NSEC_PER_SEC	1000000000L
#define FSEC_PER_SEC	1000000000000000LL

#define TIME_T_MAX	(time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)

static inline int timespec_equal(const struct timespec *a,
                                 const struct timespec *b)
{
	return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
}

/*
 * lhs < rhs:  return <0
 * lhs == rhs: return 0
 * lhs > rhs:  return >0
 */
static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
{
	if (lhs->tv_sec < rhs->tv_sec)
		return -1;
	if (lhs->tv_sec > rhs->tv_sec)
		return 1;
	return lhs->tv_nsec - rhs->tv_nsec;
}

static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
{
	if (lhs->tv_sec < rhs->tv_sec)
		return -1;
	if (lhs->tv_sec > rhs->tv_sec)
		return 1;
	return lhs->tv_usec - rhs->tv_usec;
}

extern unsigned long mktime(const unsigned int year, const unsigned int mon,
			    const unsigned int day, const unsigned int hour,
			    const unsigned int min, const unsigned int sec);

extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);

/*
 * timespec_add_safe assumes both values are positive and checks
 * for overflow. It will return TIME_T_MAX if the reutrn would be
 * smaller then either of the arguments.
 */
extern struct timespec timespec_add_safe(const struct timespec lhs,
					 const struct timespec rhs);


static inline struct timespec timespec_add(struct timespec lhs,
						struct timespec rhs)
{
	struct timespec ts_delta;
	set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec,
				lhs.tv_nsec + rhs.tv_nsec);
	return ts_delta;
}

/*
 * sub = lhs - rhs, in normalized form
 */
static inline struct timespec timespec_sub(struct timespec lhs,
						struct timespec rhs)
{
	struct timespec ts_delta;
	set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
				lhs.tv_nsec - rhs.tv_nsec);
	return ts_delta;
}

/*
 * Returns true if the timespec is norm, false if denorm:
 */
#define timespec_valid(ts) \
	(((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))

extern seqlock_t xtime_lock;

extern void read_persistent_clock(struct timespec *ts);
extern void read_boot_clock(struct timespec *ts);
extern int update_persistent_clock(struct timespec now);
extern int no_sync_cmos_clock __read_mostly;
void timekeeping_init(void);
extern int timekeeping_suspended;

unsigned long get_seconds(void);
struct timespec current_kernel_time(void);
struct timespec __current_kernel_time(void); /* does not take xtime_lock */
struct timespec __get_wall_to_monotonic(void); /* does not take xtime_lock */
struct timespec get_monotonic_coarse(void);

#define CURRENT_TIME		(current_kernel_time())
#define CURRENT_TIME_SEC	((struct timespec) { get_seconds(), 0 })

/* Some architectures do not supply their own clocksource.
 * This is mainly the case in architectures that get their
 * inter-tick times by reading the counter on their interval
 * timer. Since these timers wrap every tick, they're not really
 * useful as clocksources. Wrapping them to act like one is possible
 * but not very efficient. So we provide a callout these arches
 * can implement for use with the jiffies clocksource to provide
 * finer then tick granular time.
 */
#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
extern u32 arch_gettimeoffset(void);
#else
static inline u32 arch_gettimeoffset(void) { return 0; }
#endif

extern void do_gettimeofday(struct timeval *tv);
extern int do_settimeofday(struct timespec *tv);
extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
struct itimerval;
extern int do_setitimer(int which, struct itimerval *value,
			struct itimerval *ovalue);
extern unsigned int alarm_setitimer(unsigned int seconds);
extern int do_getitimer(int which, struct itimerval *value);
extern void getnstimeofday(struct timespec *tv);
extern void getrawmonotonic(struct timespec *ts);
extern void getboottime(struct timespec *ts);
extern void monotonic_to_bootbased(struct timespec *ts);

extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
extern int timekeeping_valid_for_hres(void);
extern u64 timekeeping_max_deferment(void);
extern void update_wall_time(void);
extern void timekeeping_leap_insert(int leapsecond);

struct tms;
extern void do_sys_times(struct tms *);

/*
 * Similar to the struct tm in userspace <time.h>, but it needs to be here so
 * that the kernel source is self contained.
 */
struct tm {
	/*
	 * the number of seconds after the minute, normally in the range
	 * 0 to 59, but can be up to 60 to allow for leap seconds
	 */
	int tm_sec;
	/* the number of minutes after the hour, in the range 0 to 59*/
	int tm_min;
	/* the number of hours past midnight, in the range 0 to 23 */
	int tm_hour;
	/* the day of the month, in the range 1 to 31 */
	int tm_mday;
	/* the number of months since January, in the range 0 to 11 */
	int tm_mon;
	/* the number of years since 1900 */
	long tm_year;
	/* the number of days since Sunday, in the range 0 to 6 */
	int tm_wday;
	/* the number of days since January 1, in the range 0 to 365 */
	int tm_yday;
};

void time_to_tm(time_t totalsecs, int offset, struct tm *result);

/**
 * timespec_to_ns - Convert timespec to nanoseconds
 * @ts:		pointer to the timespec variable to be converted
 *
 * Returns the scalar nanosecond representation of the timespec
 * parameter.
 */
static inline s64 timespec_to_ns(const struct timespec *ts)
{
	return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
}

/**
 * timeval_to_ns - Convert timeval to nanoseconds
 * @ts:		pointer to the timeval variable to be converted
 *
 * Returns the scalar nanosecond representation of the timeval
 * parameter.
 */
static inline s64 timeval_to_ns(const struct timeval *tv)
{
	return ((s64) tv->tv_sec * NSEC_PER_SEC) +
		tv->tv_usec * NSEC_PER_USEC;
}

/**
 * ns_to_timespec - Convert nanoseconds to timespec
 * @nsec:	the nanoseconds value to be converted
 *
 * Returns the timespec representation of the nsec parameter.
 */
extern struct timespec ns_to_timespec(const s64 nsec);

/**
 * ns_to_timeval - Convert nanoseconds to timeval
 * @nsec:	the nanoseconds value to be converted
 *
 * Returns the timeval representation of the nsec parameter.
 */
extern struct timeval ns_to_timeval(const s64 nsec);

/**
 * timespec_add_ns - Adds nanoseconds to a timespec
 * @a:		pointer to timespec to be incremented
 * @ns:		unsigned nanoseconds value to be added
 *
 * This must always be inlined because its used from the x86-64 vdso,
 * which cannot call other kernel functions.
 */
static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
{
	a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
	a->tv_nsec = ns;
}
#endif /* __KERNEL__ */

#define NFDBITS			__NFDBITS

#define FD_SETSIZE		__FD_SETSIZE
#define FD_SET(fd,fdsetp)	__FD_SET(fd,fdsetp)
#define FD_CLR(fd,fdsetp)	__FD_CLR(fd,fdsetp)
#define FD_ISSET(fd,fdsetp)	__FD_ISSET(fd,fdsetp)
#define FD_ZERO(fdsetp)		__FD_ZERO(fdsetp)

/*
 * Names of the interval timers, and structure
 * defining a timer setting:
 */
#define	ITIMER_REAL		0
#define	ITIMER_VIRTUAL		1
#define	ITIMER_PROF		2

struct itimerspec {
	struct timespec it_interval;	/* timer period */
	struct timespec it_value;	/* timer expiration */
};

struct itimerval {
	struct timeval it_interval;	/* timer interval */
	struct timeval it_value;	/* current value */
};

/*
 * The IDs of the various system clocks (for POSIX.1b interval timers):
 */
#define CLOCK_REALTIME			0
#define CLOCK_MONOTONIC			1
#define CLOCK_PROCESS_CPUTIME_ID	2
#define CLOCK_THREAD_CPUTIME_ID		3
#define CLOCK_MONOTONIC_RAW		4
#define CLOCK_REALTIME_COARSE		5
#define CLOCK_MONOTONIC_COARSE		6

/*
 * The IDs of various hardware clocks:
 */
#define CLOCK_SGI_CYCLE			10
#define MAX_CLOCKS			16
#define CLOCKS_MASK			(CLOCK_REALTIME | CLOCK_MONOTONIC)
#define CLOCKS_MONO			CLOCK_MONOTONIC

/*
 * The various flags for setting POSIX.1b interval timers:
 */
#define TIMER_ABSTIME			0x01

#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_TIME_H
	2	#define _LINUX_TIME_H
	3
	4	#include <linux/types.h>
	5
	6	#ifdef __KERNEL__
82644459	7	# include <linux/cache.h>
57a55875	8	# include <linux/seqlock.h>
f595ec96	9	# include <linux/math64.h>
1da177e4 LT	10	#endif
	11
	12	#ifndef _STRUCT_TIMESPEC
	13	#define _STRUCT_TIMESPEC
	14	struct timespec {
85efde6f AB	15	__kernel_time_t tv_sec; /* seconds */
85efde6f AB	16	long tv_nsec; /* nanoseconds */
1da177e4	17	};
57a55875	18	#endif
1da177e4 LT	19
1da177e4 LT	20	struct timeval {
85efde6f AB	21	__kernel_time_t tv_sec; /* seconds */
85efde6f AB	22	__kernel_suseconds_t tv_usec; /* microseconds */
1da177e4 LT	23	};
	24
	25	struct timezone {
	26	int tz_minuteswest; /* minutes west of Greenwich */
	27	int tz_dsttime; /* type of dst correction */
	28	};
	29
	30	#ifdef __KERNEL__
	31
b418da16 CH	32	extern struct timezone sys_tz;
b418da16 CH	33
57a55875	34	/* Parameters used to convert the timespec values: */
05ebb761 VP	35	#define MSEC_PER_SEC 1000L
	36	#define USEC_PER_MSEC 1000L
	37	#define NSEC_PER_USEC 1000L
	38	#define NSEC_PER_MSEC 1000000L
	39	#define USEC_PER_SEC 1000000L
	40	#define NSEC_PER_SEC 1000000000L
4936a3b9	41	#define FSEC_PER_SEC 1000000000000000LL
1da177e4	42
df0cc053 TG	43	#define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
df0cc053 TG	44
5b78cc9a JE	45	static inline int timespec_equal(const struct timespec *a,
5b78cc9a JE	46	const struct timespec *b)
57a55875	47	{
1da177e4	48	return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
57a55875	49	}
1da177e4	50
643a6545 AM	51	/*
	52	* lhs < rhs: return <0
	53	* lhs == rhs: return 0
	54	* lhs > rhs: return >0
	55	*/
77adbfbf	56	static inline int timespec_compare(const struct timespec lhs, const struct timespec rhs)
643a6545 AM	57	{
	58	if (lhs->tv_sec < rhs->tv_sec)
	59	return -1;
	60	if (lhs->tv_sec > rhs->tv_sec)
	61	return 1;
	62	return lhs->tv_nsec - rhs->tv_nsec;
	63	}
	64
77adbfbf	65	static inline int timeval_compare(const struct timeval lhs, const struct timeval rhs)
643a6545 AM	66	{
	67	if (lhs->tv_sec < rhs->tv_sec)
	68	return -1;
	69	if (lhs->tv_sec > rhs->tv_sec)
	70	return 1;
	71	return lhs->tv_usec - rhs->tv_usec;
	72	}
	73
f4818900 IM	74	extern unsigned long mktime(const unsigned int year, const unsigned int mon,
	75	const unsigned int day, const unsigned int hour,
	76	const unsigned int min, const unsigned int sec);
	77
12e09337	78	extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
ce3bf7ab JS	79
	80	/*
	81	* timespec_add_safe assumes both values are positive and checks
	82	* for overflow. It will return TIME_T_MAX if the reutrn would be
	83	* smaller then either of the arguments.
	84	*/
df0cc053 TG	85	extern struct timespec timespec_add_safe(const struct timespec lhs,
df0cc053 TG	86	const struct timespec rhs);
1da177e4	87
ce3bf7ab JS	88
	89	static inline struct timespec timespec_add(struct timespec lhs,
	90	struct timespec rhs)
	91	{
	92	struct timespec ts_delta;
	93	set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec,
	94	lhs.tv_nsec + rhs.tv_nsec);
	95	return ts_delta;
	96	}
	97
ca74e92b SN	98	/*
	99	* sub = lhs - rhs, in normalized form
	100	*/
	101	static inline struct timespec timespec_sub(struct timespec lhs,
	102	struct timespec rhs)
	103	{
	104	struct timespec ts_delta;
	105	set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
	106	lhs.tv_nsec - rhs.tv_nsec);
	107	return ts_delta;
	108	}
	109
5f82b2b7 TG	110	/*
	111	* Returns true if the timespec is norm, false if denorm:
	112	*/
	113	#define timespec_valid(ts) \
bd3f8f2b	114	(((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
5f82b2b7	115
ba2a631b	116	extern seqlock_t xtime_lock;
1da177e4	117
d4f587c6	118	extern void read_persistent_clock(struct timespec *ts);
23970e38	119	extern void read_boot_clock(struct timespec *ts);
82644459 TG	120	extern int update_persistent_clock(struct timespec now);
82644459 TG	121	extern int no_sync_cmos_clock __read_mostly;
ad596171	122	void timekeeping_init(void);
1c5745aa	123	extern int timekeeping_suspended;
ad596171	124
17c38b74	125	unsigned long get_seconds(void);
1da177e4	126	struct timespec current_kernel_time(void);
8ab4351a JS	127	struct timespec __current_kernel_time(void); /* does not take xtime_lock */
8ab4351a JS	128	struct timespec __get_wall_to_monotonic(void); /* does not take xtime_lock */
da15cfda	129	struct timespec get_monotonic_coarse(void);
1da177e4	130
57a55875	131	#define CURRENT_TIME (current_kernel_time())
2c6b47de	132	#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
1da177e4	133
7d27558c JS	134	/* Some architectures do not supply their own clocksource.
	135	* This is mainly the case in architectures that get their
	136	* inter-tick times by reading the counter on their interval
	137	* timer. Since these timers wrap every tick, they're not really
	138	* useful as clocksources. Wrapping them to act like one is possible
	139	* but not very efficient. So we provide a callout these arches
	140	* can implement for use with the jiffies clocksource to provide
	141	* finer then tick granular time.
	142	*/
	143	#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
	144	extern u32 arch_gettimeoffset(void);
	145	#else
	146	static inline u32 arch_gettimeoffset(void) { return 0; }
	147	#endif
	148
1da177e4 LT	149	extern void do_gettimeofday(struct timeval *tv);
	150	extern int do_settimeofday(struct timespec *tv);
	151	extern int do_sys_settimeofday(struct timespec tv, struct timezone tz);
becf8b5d	152	#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
c7887325	153	extern long do_utimes(int dfd, const char __user filename, struct timespec times, int flags);
1da177e4	154	struct itimerval;
57a55875 IM	155	extern int do_setitimer(int which, struct itimerval *value,
57a55875 IM	156	struct itimerval *ovalue);
c08b8a49	157	extern unsigned int alarm_setitimer(unsigned int seconds);
1da177e4	158	extern int do_getitimer(int which, struct itimerval *value);
57a55875	159	extern void getnstimeofday(struct timespec *tv);
2d42244a	160	extern void getrawmonotonic(struct timespec *ts);
7c3f1a57 TJ	161	extern void getboottime(struct timespec *ts);
7c3f1a57 TJ	162	extern void monotonic_to_bootbased(struct timespec *ts);
1da177e4 LT	163
1da177e4 LT	164	extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
cf4fc6cb	165	extern int timekeeping_valid_for_hres(void);
98962465	166	extern u64 timekeeping_max_deferment(void);
8524070b	167	extern void update_wall_time(void);
31089c13	168	extern void timekeeping_leap_insert(int leapsecond);
1da177e4	169
f06febc9 FM	170	struct tms;
	171	extern void do_sys_times(struct tms *);
	172
57f1f087 Z	173	/*
	174	* Similar to the struct tm in userspace <time.h>, but it needs to be here so
	175	* that the kernel source is self contained.
	176	*/
	177	struct tm {
	178	/*
	179	* the number of seconds after the minute, normally in the range
	180	* 0 to 59, but can be up to 60 to allow for leap seconds
	181	*/
	182	int tm_sec;
	183	/* the number of minutes after the hour, in the range 0 to 59*/
	184	int tm_min;
	185	/* the number of hours past midnight, in the range 0 to 23 */
	186	int tm_hour;
	187	/* the day of the month, in the range 1 to 31 */
	188	int tm_mday;
	189	/* the number of months since January, in the range 0 to 11 */
	190	int tm_mon;
	191	/* the number of years since 1900 */
	192	long tm_year;
	193	/* the number of days since Sunday, in the range 0 to 6 */
	194	int tm_wday;
	195	/* the number of days since January 1, in the range 0 to 365 */
	196	int tm_yday;
	197	};
	198
	199	void time_to_tm(time_t totalsecs, int offset, struct tm *result);
	200
f8f46da3 TG	201	/**
	202	* timespec_to_ns - Convert timespec to nanoseconds
	203	* @ts: pointer to the timespec variable to be converted
	204	*
	205	* Returns the scalar nanosecond representation of the timespec
	206	* parameter.
	207	*/
df869b63	208	static inline s64 timespec_to_ns(const struct timespec *ts)
f8f46da3	209	{
df869b63	210	return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
f8f46da3 TG	211	}
	212
	213	/**
	214	* timeval_to_ns - Convert timeval to nanoseconds
	215	* @ts: pointer to the timeval variable to be converted
	216	*
	217	* Returns the scalar nanosecond representation of the timeval
	218	* parameter.
	219	*/
df869b63	220	static inline s64 timeval_to_ns(const struct timeval *tv)
f8f46da3	221	{
df869b63	222	return ((s64) tv->tv_sec * NSEC_PER_SEC) +
f8f46da3 TG	223	tv->tv_usec * NSEC_PER_USEC;
	224	}
	225
	226	/**
	227	* ns_to_timespec - Convert nanoseconds to timespec
	228	* @nsec: the nanoseconds value to be converted
	229	*
	230	* Returns the timespec representation of the nsec parameter.
	231	*/
df869b63	232	extern struct timespec ns_to_timespec(const s64 nsec);
f8f46da3 TG	233
	234	/**
	235	* ns_to_timeval - Convert nanoseconds to timeval
	236	* @nsec: the nanoseconds value to be converted
	237	*
	238	* Returns the timeval representation of the nsec parameter.
	239	*/
df869b63	240	extern struct timeval ns_to_timeval(const s64 nsec);
f8f46da3	241
cf3c769b JS	242	/**
	243	* timespec_add_ns - Adds nanoseconds to a timespec
	244	* @a: pointer to timespec to be incremented
	245	* @ns: unsigned nanoseconds value to be added
9412e286 JF	246	*
	247	* This must always be inlined because its used from the x86-64 vdso,
	248	* which cannot call other kernel functions.
cf3c769b	249	*/
9412e286	250	static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
cf3c769b	251	{
9412e286	252	a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
cf3c769b JS	253	a->tv_nsec = ns;
cf3c769b JS	254	}
1da177e4 LT	255	#endif /* __KERNEL__ */
	256
	257	#define NFDBITS __NFDBITS
	258
	259	#define FD_SETSIZE __FD_SETSIZE
	260	#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
	261	#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
	262	#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
	263	#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
	264
	265	/*
	266	* Names of the interval timers, and structure
57a55875	267	* defining a timer setting:
1da177e4	268	*/
57a55875 IM	269	#define ITIMER_REAL 0
	270	#define ITIMER_VIRTUAL 1
	271	#define ITIMER_PROF 2
1da177e4	272
57a55875 IM	273	struct itimerspec {
	274	struct timespec it_interval; /* timer period */
	275	struct timespec it_value; /* timer expiration */
1da177e4 LT	276	};
1da177e4 LT	277
57a55875 IM	278	struct itimerval {
	279	struct timeval it_interval; /* timer interval */
	280	struct timeval it_value; /* current value */
1da177e4 LT	281	};
1da177e4 LT	282
1da177e4	283	/*
57a55875	284	* The IDs of the various system clocks (for POSIX.1b interval timers):
1da177e4	285	*/
1ad106ca IM	286	#define CLOCK_REALTIME 0
	287	#define CLOCK_MONOTONIC 1
	288	#define CLOCK_PROCESS_CPUTIME_ID 2
	289	#define CLOCK_THREAD_CPUTIME_ID 3
2d42244a	290	#define CLOCK_MONOTONIC_RAW 4
da15cfda JS	291	#define CLOCK_REALTIME_COARSE 5
da15cfda JS	292	#define CLOCK_MONOTONIC_COARSE 6
1da177e4 LT	293
1da177e4 LT	294	/*
57a55875	295	* The IDs of various hardware clocks:
1da177e4	296	*/
1ad106ca IM	297	#define CLOCK_SGI_CYCLE 10
	298	#define MAX_CLOCKS 16
	299	#define CLOCKS_MASK (CLOCK_REALTIME \| CLOCK_MONOTONIC)
	300	#define CLOCKS_MONO CLOCK_MONOTONIC
1da177e4 LT	301
1da177e4 LT	302	/*
57a55875	303	* The various flags for setting POSIX.1b interval timers:
1da177e4	304	*/
1ad106ca	305	#define TIMER_ABSTIME 0x01
1da177e4 LT	306
1da177e4 LT	307	#endif