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0f6e6b9764
glibc/include/time.h
Lukasz Majewski 0f6e6b9764 y2038: linux: Provide __timerfd_gettime64 implementation 
This patch replaces auto generated wrapper (as described in
sysdeps/unix/sysv/linux/syscalls.list) for timerfd_gettime with one which
adds extra support for reading 64 bit time values on machines with
__TIMESIZE != 64.
There is no functional change for architectures already supporting 64 bit
time ABI.

This patch is conceptually identical to timer_gettime conversion already
done in sysdeps/unix/sysv/linux/timer_gettime.c.
Please refer to corresponding commit message for detailed description of
introduced functions and the testing procedure.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

---
Changes for v4:
- Update date from 2019 to 2020

Changes for v3:
- Add missing libc_hidden_def()

Changes for v2:
- Remove "Contributed by" from the file header
- Remove early check for (fd < 0) in __timerfd_gettime64 as the fd
  correctness check is already done in Linux kernel
- Add single descriptive comment line to provide concise explanation
  of the code
2020-02-02 11:23:23 +01:00

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#ifndef _TIME_H
#include <time/time.h>
#ifndef _ISOMAC
# include <bits/types/struct_timeval.h>
# include <bits/types/locale_t.h>
# include <stdbool.h>
# include <time/mktime-internal.h>
# include <endian.h>
# include <time-clockid.h>
extern __typeof (strftime_l) __strftime_l;
libc_hidden_proto (__strftime_l)
extern __typeof (strptime_l) __strptime_l;
libc_hidden_proto (asctime)
libc_hidden_proto (mktime)
libc_hidden_proto (timelocal)
libc_hidden_proto (localtime)
libc_hidden_proto (strftime)
libc_hidden_proto (strptime)
extern __typeof (clock_gettime) __clock_gettime;
libc_hidden_proto (__clock_gettime)
extern __typeof (clock_settime) __clock_settime;
libc_hidden_proto (__clock_settime)
extern __typeof (clock_nanosleep) __clock_nanosleep;
libc_hidden_proto (__clock_nanosleep);
#ifdef __linux__
extern __typeof (clock_adjtime) __clock_adjtime;
libc_hidden_proto (__clock_adjtime);
#endif
/* Now define the internal interfaces. */
struct tm;
/* Defined in mktime.c. */
extern const unsigned short int __mon_yday[2][13] attribute_hidden;
/* Defined in localtime.c. */
extern struct tm _tmbuf attribute_hidden;
/* Defined in tzset.c. */
extern char *__tzstring (const char *string) attribute_hidden;
extern int __use_tzfile attribute_hidden;
extern void __tzfile_read (const char *file, size_t extra,
char **extrap) attribute_hidden;
extern void __tzfile_compute (__time64_t timer, int use_localtime,
long int *leap_correct, int *leap_hit,
struct tm *tp) attribute_hidden;
extern void __tzfile_default (const char *std, const char *dst,
int stdoff, int dstoff)
attribute_hidden;
extern void __tzset_parse_tz (const char *tz) attribute_hidden;
extern void __tz_compute (__time64_t timer, struct tm *tm, int use_localtime)
__THROW attribute_hidden;
#if __TIMESIZE == 64
# define __timespec64 timespec
#else
/* The glibc Y2038-proof struct __timespec64 structure for a time value.
To keep things Posix-ish, we keep the nanoseconds field a 32-bit
signed long, but since the Linux field is a 64-bit signed int, we
pad our tv_nsec with a 32-bit unnamed bit-field padding.
As a general rule the Linux kernel is ignoring upper 32 bits of
tv_nsec field. */
struct __timespec64
{
__time64_t tv_sec; /* Seconds */
# if BYTE_ORDER == BIG_ENDIAN
__int32_t :32; /* Padding */
__int32_t tv_nsec; /* Nanoseconds */
# else
__int32_t tv_nsec; /* Nanoseconds */
__int32_t :32; /* Padding */
# endif
};
#endif
#if __TIMESIZE == 64
# define __itimerspec64 itimerspec
#else
/* The glibc's internal representation of the struct itimerspec. */
struct __itimerspec64
{
struct __timespec64 it_interval;
struct __timespec64 it_value;
};
#endif
#if __TIMESIZE == 64
# define __ctime64 ctime
#else
extern char *__ctime64 (const __time64_t *__timer) __THROW;
libc_hidden_proto (__ctime64)
#endif
#if __TIMESIZE == 64
# define __ctime64_r ctime_r
#else
extern char *__ctime64_r (const __time64_t *__restrict __timer,
char *__restrict __buf) __THROW;
libc_hidden_proto (__ctime64_r)
#endif
#if __TIMESIZE == 64
# define __localtime64 localtime
#else
extern struct tm *__localtime64 (const __time64_t *__timer);
libc_hidden_proto (__localtime64)
#endif
extern struct tm *__localtime_r (const time_t *__timer,
struct tm *__tp) attribute_hidden;
#if __TIMESIZE != 64
extern struct tm *__localtime64_r (const __time64_t *__timer,
struct tm *__tp);
libc_hidden_proto (__localtime64_r)
extern __time64_t __mktime64 (struct tm *__tp) __THROW;
libc_hidden_proto (__mktime64)
#endif
extern struct tm *__gmtime_r (const time_t *__restrict __timer,
struct tm *__restrict __tp);
libc_hidden_proto (__gmtime_r)
#if __TIMESIZE == 64
# define __gmtime64 gmtime
#else
extern struct tm *__gmtime64 (const __time64_t *__timer);
libc_hidden_proto (__gmtime64)
extern struct tm *__gmtime64_r (const __time64_t *__restrict __timer,
struct tm *__restrict __tp);
libc_hidden_proto (__gmtime64_r)
extern __time64_t __timegm64 (struct tm *__tp) __THROW;
libc_hidden_proto (__timegm64)
#endif
#if __TIMESIZE == 64
# define __clock_settime64 __clock_settime
#else
extern int __clock_settime64 (clockid_t clock_id,
const struct __timespec64 *tp);
libc_hidden_proto (__clock_settime64)
#endif
#if __TIMESIZE == 64
# define __clock_getres64 __clock_getres
#else
extern int __clock_getres64 (clockid_t clock_id,
struct __timespec64 *tp);
libc_hidden_proto (__clock_getres64);
#endif
#if __TIMESIZE == 64
# define __utimensat64 __utimensat
#else
extern int __utimensat64 (int fd, const char *file,
const struct __timespec64 tsp[2], int flags);
libc_hidden_proto (__utimensat64);
#endif
extern int __utimensat64_helper (int fd, const char *file,
const struct __timespec64 tsp[2], int flags);
libc_hidden_proto (__utimensat64_helper);
#if __TIMESIZE == 64
# define __futimens64 __futimens
#else
extern int __futimens64 (int fd, const struct __timespec64 tsp[2]);
libc_hidden_proto (__futimens64);
#endif
#if __TIMESIZE == 64
# define __timer_gettime64 __timer_gettime
# define __timerfd_gettime64 __timerfd_gettime
#else
extern int __timer_gettime64 (timer_t timerid, struct __itimerspec64 *value);
extern int __timerfd_gettime64 (int fd, struct __itimerspec64 *value);
libc_hidden_proto (__timer_gettime64);
libc_hidden_proto (__timerfd_gettime64);
#endif
#if __TIMESIZE == 64
# define __timer_settime64 __timer_settime
#else
extern int __timer_settime64 (timer_t timerid, int flags,
const struct __itimerspec64 *value,
struct __itimerspec64 *ovalue);
libc_hidden_proto (__timer_settime64);
#endif
/* Compute the `struct tm' representation of T,
offset OFFSET seconds east of UTC,
and store year, yday, mon, mday, wday, hour, min, sec into *TP.
Return nonzero if successful. */
extern int __offtime (__time64_t __timer,
long int __offset,
struct tm *__tp) attribute_hidden;
extern char *__asctime_r (const struct tm *__tp, char *__buf)
attribute_hidden;
extern void __tzset (void) attribute_hidden;
/* Prototype for the internal function to get information based on TZ. */
extern struct tm *__tz_convert (__time64_t timer, int use_localtime,
struct tm *tp) attribute_hidden;
extern int __nanosleep (const struct timespec *__requested_time,
struct timespec *__remaining);
hidden_proto (__nanosleep)
extern int __getdate_r (const char *__string, struct tm *__resbufp)
attribute_hidden;
/* Determine CLK_TCK value. */
extern int __getclktck (void) attribute_hidden;
/* strptime support. */
extern char * __strptime_internal (const char *rp, const char *fmt,
struct tm *tm, void *statep,
locale_t locparam) attribute_hidden;
#if __TIMESIZE == 64
# define __difftime64 __difftime
#else
extern double __difftime64 (__time64_t time1, __time64_t time0);
libc_hidden_proto (__difftime64)
#endif
extern double __difftime (time_t time1, time_t time0);
#if __TIMESIZE == 64
# define __clock_nanosleep_time64 __clock_nanosleep
# define __clock_gettime64 __clock_gettime
#else
extern int __clock_nanosleep_time64 (clockid_t clock_id,
int flags, const struct __timespec64 *req,
struct __timespec64 *rem);
libc_hidden_proto (__clock_nanosleep_time64)
extern int __clock_gettime64 (clockid_t clock_id, struct __timespec64 *tp);
libc_hidden_proto (__clock_gettime64)
#endif
/* Use in the clock_* functions. Size of the field representing the
actual clock ID. */
#define CLOCK_IDFIELD_SIZE 3
/* Check whether T fits in time_t. */
static inline bool
in_time_t_range (__time64_t t)
{
time_t s = t;
return s == t;
}
/* Convert a known valid struct timeval into a struct __timespec64. */
static inline struct __timespec64
valid_timeval_to_timespec64 (const struct timeval tv)
{
struct __timespec64 ts64;
ts64.tv_sec = tv.tv_sec;
ts64.tv_nsec = tv.tv_usec * 1000;
return ts64;
}
/* Convert a known valid struct timespec into a struct __timespec64. */
static inline struct __timespec64
valid_timespec_to_timespec64 (const struct timespec ts)
{
struct __timespec64 ts64;
ts64.tv_sec = ts.tv_sec;
ts64.tv_nsec = ts.tv_nsec;
return ts64;
}
/* Convert a valid and within range of struct timespec, struct
__timespec64 into a struct timespec. */
static inline struct timespec
valid_timespec64_to_timespec (const struct __timespec64 ts64)
{
struct timespec ts;
ts.tv_sec = (time_t) ts64.tv_sec;
ts.tv_nsec = ts64.tv_nsec;
return ts;
}
/* Convert a valid and within range of struct timeval struct
__timespec64 into a struct timeval. */
static inline struct timeval
valid_timespec64_to_timeval (const struct __timespec64 ts64)
{
struct timeval tv;
tv.tv_sec = (time_t) ts64.tv_sec;
tv.tv_usec = ts64.tv_nsec / 1000;
return tv;
}
/* Check if a value is in the valid nanoseconds range. Return true if
it is, false otherwise. */
static inline bool
valid_nanoseconds (__syscall_slong_t ns)
{
return __glibc_likely (0 <= ns && ns < 1000000000);
}
/* Helper function to get time in seconds, similar to time. */
static inline time_t
time_now (void)
{
struct timespec ts;
__clock_gettime (TIME_CLOCK_GETTIME_CLOCKID, &ts);
return ts.tv_sec;
}
#endif
#endif
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