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dd535f4f19
It was raised on libc-help [1] that some Linux kernel interfaces expect
the libc to define __USE_TIME_BITS64 to indicate the time_t size for the
kABI. Different than defined by the initial y2038 design document [2],
the __USE_TIME_BITS64 is only defined for ABIs that support more than
one time_t size (by defining the _TIME_BITS for each module).
The 64 bit time_t redirects are now enabled using a different internal
define (__USE_TIME64_REDIRECTS). There is no expected change in semantic
or code generation.
Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu, and
arm-linux-gnueabi
[1] https://sourceware.org/pipermail/libc-help/2024-January/006557.html
[2] https://sourceware.org/glibc/wiki/Y2038ProofnessDesign
Reviewed-by: DJ Delorie <dj@redhat.com>
(cherry picked from commit a4ed0471d7)
261 lines
8.9 KiB
C
261 lines
8.9 KiB
C
/* Copyright (C) 1991-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _SYS_TIME_H
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#define _SYS_TIME_H 1
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#include <features.h>
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#include <bits/types.h>
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#include <bits/types/time_t.h>
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#include <bits/types/struct_timeval.h>
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#ifndef __suseconds_t_defined
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typedef __suseconds_t suseconds_t;
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# define __suseconds_t_defined
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#endif
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#include <sys/select.h>
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__BEGIN_DECLS
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#ifdef __USE_GNU
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/* Macros for converting between `struct timeval' and `struct timespec'. */
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# define TIMEVAL_TO_TIMESPEC(tv, ts) { \
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(ts)->tv_sec = (tv)->tv_sec; \
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(ts)->tv_nsec = (tv)->tv_usec * 1000; \
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}
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# define TIMESPEC_TO_TIMEVAL(tv, ts) { \
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(tv)->tv_sec = (ts)->tv_sec; \
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(tv)->tv_usec = (ts)->tv_nsec / 1000; \
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}
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#endif
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#ifdef __USE_MISC
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/* Structure crudely representing a timezone.
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This is obsolete and should never be used. */
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struct timezone
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{
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int tz_minuteswest; /* Minutes west of GMT. */
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int tz_dsttime; /* Nonzero if DST is ever in effect. */
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};
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#endif
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/* Get the current time of day, putting it into *TV.
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If TZ is not null, *TZ must be a struct timezone, and both fields
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will be set to zero.
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Calling this function with a non-null TZ is obsolete;
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use localtime etc. instead.
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This function itself is semi-obsolete;
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most callers should use time or clock_gettime instead. */
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#ifndef __USE_TIME64_REDIRECTS
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extern int gettimeofday (struct timeval *__restrict __tv,
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void *__restrict __tz) __THROW __nonnull ((1));
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#else
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# ifdef __REDIRECT_NTH
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extern int __REDIRECT_NTH (gettimeofday, (struct timeval *__restrict __tv,
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void *__restrict __tz),
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__gettimeofday64) __nonnull ((1));
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# else
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# define gettimeofday __gettimeofday64
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# endif
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#endif
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#ifdef __USE_MISC
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# ifndef __USE_TIME64_REDIRECTS
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/* Set the current time of day and timezone information.
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This call is restricted to the super-user.
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Setting the timezone in this way is obsolete, but we don't yet
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warn about it because it still has some uses for which there is
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no alternative. */
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extern int settimeofday (const struct timeval *__tv,
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const struct timezone *__tz)
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__THROW;
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/* Adjust the current time of day by the amount in DELTA.
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If OLDDELTA is not NULL, it is filled in with the amount
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of time adjustment remaining to be done from the last `adjtime' call.
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This call is restricted to the super-user. */
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extern int adjtime (const struct timeval *__delta,
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struct timeval *__olddelta) __THROW;
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# else
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# ifdef __REDIRECT_NTH
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extern int __REDIRECT_NTH (settimeofday, (const struct timeval *__tv,
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const struct timezone *__tz),
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__settimeofday64);
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extern int __REDIRECT_NTH (adjtime, (const struct timeval *__delta,
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struct timeval *__olddelta),
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__adjtime64);
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# else
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# define settimeofday __settimeofday64
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# define adjtime __adjtime64
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# endif
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# endif
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#endif
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/* Values for the first argument to `getitimer' and `setitimer'. */
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enum __itimer_which
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{
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/* Timers run in real time. */
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ITIMER_REAL = 0,
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#define ITIMER_REAL ITIMER_REAL
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/* Timers run only when the process is executing. */
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ITIMER_VIRTUAL = 1,
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#define ITIMER_VIRTUAL ITIMER_VIRTUAL
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/* Timers run when the process is executing and when
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the system is executing on behalf of the process. */
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ITIMER_PROF = 2
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#define ITIMER_PROF ITIMER_PROF
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};
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/* Type of the second argument to `getitimer' and
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the second and third arguments `setitimer'. */
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struct itimerval
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{
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/* Value to put into `it_value' when the timer expires. */
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struct timeval it_interval;
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/* Time to the next timer expiration. */
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struct timeval it_value;
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};
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#if defined __USE_GNU && !defined __cplusplus
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/* Use the nicer parameter type only in GNU mode and not for C++ since the
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strict C++ rules prevent the automatic promotion. */
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typedef enum __itimer_which __itimer_which_t;
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#else
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typedef int __itimer_which_t;
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#endif
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#ifndef __USE_TIME64_REDIRECTS
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/* Set *VALUE to the current setting of timer WHICH.
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Return 0 on success, -1 on errors. */
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extern int getitimer (__itimer_which_t __which,
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struct itimerval *__value) __THROW;
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/* Set the timer WHICH to *NEW. If OLD is not NULL,
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set *OLD to the old value of timer WHICH.
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Returns 0 on success, -1 on errors. */
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extern int setitimer (__itimer_which_t __which,
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const struct itimerval *__restrict __new,
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struct itimerval *__restrict __old) __THROW;
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/* Change the access time of FILE to TVP[0] and the modification time of
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FILE to TVP[1]. If TVP is a null pointer, use the current time instead.
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Returns 0 on success, -1 on errors. */
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extern int utimes (const char *__file, const struct timeval __tvp[2])
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__THROW __nonnull ((1));
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#else
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# ifdef __REDIRECT_NTH
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extern int __REDIRECT_NTH (getitimer, (__itimer_which_t __which,
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struct itimerval *__value),
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__getitimer64);
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extern int __REDIRECT_NTH (setitimer, (__itimer_which_t __which,
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const struct itimerval *__restrict __new,
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struct itimerval *__restrict __old),
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__setitimer64);
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extern int __REDIRECT_NTH (utimes, (const char *__file,
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const struct timeval __tvp[2]),
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__utimes64) __nonnull ((1));
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# else
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# define getitimer __getitimer64
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# define setitimer __setitimer64
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# define utimes __utimes64
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# endif
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#endif
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#ifdef __USE_MISC
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# ifndef __USE_TIME64_REDIRECTS
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/* Same as `utimes', but does not follow symbolic links. */
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extern int lutimes (const char *__file, const struct timeval __tvp[2])
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__THROW __nonnull ((1));
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/* Same as `utimes', but takes an open file descriptor instead of a name. */
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extern int futimes (int __fd, const struct timeval __tvp[2]) __THROW;
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# else
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# ifdef __REDIRECT_NTH
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extern int __REDIRECT_NTH (lutimes, (const char *__file,
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const struct timeval __tvp[2]),
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__lutimes64) __nonnull ((1));
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extern int __REDIRECT_NTH (futimes, (int __fd, const struct timeval __tvp[2]),
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__futimes64);
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# else
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# define lutimes __lutimes64
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# define futimes __futimes64
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# endif
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# endif
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#endif
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#ifdef __USE_GNU
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# ifndef __USE_TIME64_REDIRECTS
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/* Change the access time of FILE relative to FD to TVP[0] and the
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modification time of FILE to TVP[1]. If TVP is a null pointer, use
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the current time instead. Returns 0 on success, -1 on errors. */
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extern int futimesat (int __fd, const char *__file,
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const struct timeval __tvp[2]) __THROW;
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# else
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# ifdef __REDIRECT_NTH
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extern int __REDIRECT_NTH (futimesat, (int __fd, const char *__file,
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const struct timeval __tvp[2]),
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__futimesat64);
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# else
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# define futimesat __futimesat64
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# endif
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# endif
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#endif
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#ifdef __USE_MISC
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/* Convenience macros for operations on timevals.
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NOTE: `timercmp' does not work for >= or <=. */
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# define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
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# define timerclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
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# define timercmp(a, b, CMP) \
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(((a)->tv_sec == (b)->tv_sec) \
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? ((a)->tv_usec CMP (b)->tv_usec) \
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: ((a)->tv_sec CMP (b)->tv_sec))
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# define timeradd(a, b, result) \
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do { \
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(result)->tv_sec = (a)->tv_sec + (b)->tv_sec; \
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(result)->tv_usec = (a)->tv_usec + (b)->tv_usec; \
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if ((result)->tv_usec >= 1000000) \
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{ \
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++(result)->tv_sec; \
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(result)->tv_usec -= 1000000; \
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} \
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} while (0)
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# define timersub(a, b, result) \
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do { \
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(result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
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(result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
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if ((result)->tv_usec < 0) { \
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--(result)->tv_sec; \
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(result)->tv_usec += 1000000; \
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} \
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} while (0)
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#endif /* Misc. */
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__END_DECLS
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#endif /* sys/time.h */
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