mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-22 00:40:03 +00:00
![Baolin Wang](/assets/img/avatar_default.png)
The struct itimerspec is not year 2038 safe on 32bit systems due to the limitation of the struct timespec members. Introduce itimerspec64 which uses struct timespec64 instead and provide conversion functions. Cc: Prarit Bhargava <prarit@redhat.com> Cc: Richard Cochran <richardcochran@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
227 lines
5.7 KiB
C
227 lines
5.7 KiB
C
#ifndef _LINUX_TIME64_H
|
|
#define _LINUX_TIME64_H
|
|
|
|
#include <uapi/linux/time.h>
|
|
#include <linux/math64.h>
|
|
|
|
typedef __s64 time64_t;
|
|
|
|
/*
|
|
* This wants to go into uapi/linux/time.h once we agreed about the
|
|
* userspace interfaces.
|
|
*/
|
|
#if __BITS_PER_LONG == 64
|
|
# define timespec64 timespec
|
|
#define itimerspec64 itimerspec
|
|
#else
|
|
struct timespec64 {
|
|
time64_t tv_sec; /* seconds */
|
|
long tv_nsec; /* nanoseconds */
|
|
};
|
|
|
|
struct itimerspec64 {
|
|
struct timespec64 it_interval;
|
|
struct timespec64 it_value;
|
|
};
|
|
|
|
#endif
|
|
|
|
/* 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
|
|
|
|
/* Located here for timespec[64]_valid_strict */
|
|
#define TIME64_MAX ((s64)~((u64)1 << 63))
|
|
#define KTIME_MAX ((s64)~((u64)1 << 63))
|
|
#define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
|
|
|
|
#if __BITS_PER_LONG == 64
|
|
|
|
static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
|
|
{
|
|
return ts64;
|
|
}
|
|
|
|
static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
|
|
{
|
|
return ts;
|
|
}
|
|
|
|
static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64)
|
|
{
|
|
return *its64;
|
|
}
|
|
|
|
static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its)
|
|
{
|
|
return *its;
|
|
}
|
|
|
|
# define timespec64_equal timespec_equal
|
|
# define timespec64_compare timespec_compare
|
|
# define set_normalized_timespec64 set_normalized_timespec
|
|
# define timespec64_add_safe timespec_add_safe
|
|
# define timespec64_add timespec_add
|
|
# define timespec64_sub timespec_sub
|
|
# define timespec64_valid timespec_valid
|
|
# define timespec64_valid_strict timespec_valid_strict
|
|
# define timespec64_to_ns timespec_to_ns
|
|
# define ns_to_timespec64 ns_to_timespec
|
|
# define timespec64_add_ns timespec_add_ns
|
|
|
|
#else
|
|
|
|
static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
|
|
{
|
|
struct timespec ret;
|
|
|
|
ret.tv_sec = (time_t)ts64.tv_sec;
|
|
ret.tv_nsec = ts64.tv_nsec;
|
|
return ret;
|
|
}
|
|
|
|
static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
|
|
{
|
|
struct timespec64 ret;
|
|
|
|
ret.tv_sec = ts.tv_sec;
|
|
ret.tv_nsec = ts.tv_nsec;
|
|
return ret;
|
|
}
|
|
|
|
static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64)
|
|
{
|
|
struct itimerspec ret;
|
|
|
|
ret.it_interval = timespec64_to_timespec(its64->it_interval);
|
|
ret.it_value = timespec64_to_timespec(its64->it_value);
|
|
return ret;
|
|
}
|
|
|
|
static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its)
|
|
{
|
|
struct itimerspec64 ret;
|
|
|
|
ret.it_interval = timespec_to_timespec64(its->it_interval);
|
|
ret.it_value = timespec_to_timespec64(its->it_value);
|
|
return ret;
|
|
}
|
|
|
|
static inline int timespec64_equal(const struct timespec64 *a,
|
|
const struct timespec64 *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 timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *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;
|
|
}
|
|
|
|
extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec);
|
|
|
|
/*
|
|
* timespec64_add_safe assumes both values are positive and checks for
|
|
* overflow. It will return TIME_T_MAX if the returned value would be
|
|
* smaller then either of the arguments.
|
|
*/
|
|
extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
|
|
const struct timespec64 rhs);
|
|
|
|
|
|
static inline struct timespec64 timespec64_add(struct timespec64 lhs,
|
|
struct timespec64 rhs)
|
|
{
|
|
struct timespec64 ts_delta;
|
|
set_normalized_timespec64(&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 timespec64 timespec64_sub(struct timespec64 lhs,
|
|
struct timespec64 rhs)
|
|
{
|
|
struct timespec64 ts_delta;
|
|
set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec,
|
|
lhs.tv_nsec - rhs.tv_nsec);
|
|
return ts_delta;
|
|
}
|
|
|
|
/*
|
|
* Returns true if the timespec64 is norm, false if denorm:
|
|
*/
|
|
static inline bool timespec64_valid(const struct timespec64 *ts)
|
|
{
|
|
/* Dates before 1970 are bogus */
|
|
if (ts->tv_sec < 0)
|
|
return false;
|
|
/* Can't have more nanoseconds then a second */
|
|
if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static inline bool timespec64_valid_strict(const struct timespec64 *ts)
|
|
{
|
|
if (!timespec64_valid(ts))
|
|
return false;
|
|
/* Disallow values that could overflow ktime_t */
|
|
if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* timespec64_to_ns - Convert timespec64 to nanoseconds
|
|
* @ts: pointer to the timespec64 variable to be converted
|
|
*
|
|
* Returns the scalar nanosecond representation of the timespec64
|
|
* parameter.
|
|
*/
|
|
static inline s64 timespec64_to_ns(const struct timespec64 *ts)
|
|
{
|
|
return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
|
|
}
|
|
|
|
/**
|
|
* ns_to_timespec64 - Convert nanoseconds to timespec64
|
|
* @nsec: the nanoseconds value to be converted
|
|
*
|
|
* Returns the timespec64 representation of the nsec parameter.
|
|
*/
|
|
extern struct timespec64 ns_to_timespec64(const s64 nsec);
|
|
|
|
/**
|
|
* timespec64_add_ns - Adds nanoseconds to a timespec64
|
|
* @a: pointer to timespec64 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 timespec64_add_ns(struct timespec64 *a, u64 ns)
|
|
{
|
|
a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
|
|
a->tv_nsec = ns;
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif /* _LINUX_TIME64_H */
|