* [PATCH v2 0/2] Y2038 support batch 1 - __time64_t and __tz_convert
@ 2018-06-14 13:51 Albert ARIBAUD (3ADEV)
2018-06-14 13:51 ` [PATCH v2 2/2] Y2038: make __tz_convert compatible with 64-bit-time Albert ARIBAUD (3ADEV)
2018-06-14 13:51 ` [PATCH v2 1/2] Y2038: Add 64-bit time for all architectures Albert ARIBAUD (3ADEV)
0 siblings, 2 replies; 16+ messages in thread
From: Albert ARIBAUD (3ADEV) @ 2018-06-14 13:51 UTC (permalink / raw)
To: libc-alpha; +Cc: Albert ARIBAUD (3ADEV)
This is the first batch of Y2038 support patches.
The first patch introduces __TIMESIZE (which is the bit size of time_t
at glibc build time, and equals __WORDSIZE except for x32 where __WORDSIZE
is 32 but __TIMESIZE is 64) and __time64_t, the 64-bit counterpart of time_t,
to be used in 64-bit-time implementations of public APIs related to time.
Note that __time64_t replaces internal_time_t previously introduced.
The second patch makes __tz_convert compatible with 64-bit time. This
implies creating 64-bit-time versions of its callers and turning their
original versions into wrappers if they were 32-bit-time.
These patches are functionally tested as part of the whole Y2038 patch
series using the ad hoc framework at https://github.com/3adev/y2038 which
runs tests using times below, at and beyond the Y2038 limit.
These patches were also run through build-many-glibcs.py to ensure that
existing glibc configurations are not broken. The minimal configuration
set is x86_64-linux-gnu, aarch64-linux-gnu, powerpc-linux-gnu, and
arm-linux-gnueabi.
Albert ARIBAUD (3ADEV) (2):
Y2038: Add 64-bit time for all architectures
Y2038: make __tz_convert compatible with 64-bit-time
bits/timesize.h | 23 ++++++++
bits/timesizes.h | 37 +++++++++++++
include/sys/types.h | 1 +
include/time.h | 57 ++++++++++++++++----
posix/bits/types.h | 8 +++
stdlib/Makefile | 2 +-
sysdeps/unix/sysv/linux/x86/bits/timesizes.h | 32 +++++++++++
sysdeps/x86/bits/timesize.h | 21 ++++++++
time/ctime.c | 20 +++++--
time/ctime_r.c | 20 +++++--
time/gmtime.c | 40 ++++++++++++--
time/localtime.c | 37 +++++++++++--
time/offtime.c | 12 ++---
time/tzfile.c | 32 +++++------
time/tzset.c | 30 +++++------
15 files changed, 302 insertions(+), 70 deletions(-)
create mode 100644 bits/timesize.h
create mode 100644 bits/timesizes.h
create mode 100644 sysdeps/unix/sysv/linux/x86/bits/timesizes.h
create mode 100644 sysdeps/x86/bits/timesize.h
--
2.17.1
^ permalink raw reply [flat|nested] 16+ messages in thread
* [PATCH v2 2/2] Y2038: make __tz_convert compatible with 64-bit-time
2018-06-14 13:51 [PATCH v2 0/2] Y2038 support batch 1 - __time64_t and __tz_convert Albert ARIBAUD (3ADEV)
@ 2018-06-14 13:51 ` Albert ARIBAUD (3ADEV)
2018-06-14 17:07 ` Paul Eggert
2018-06-14 13:51 ` [PATCH v2 1/2] Y2038: Add 64-bit time for all architectures Albert ARIBAUD (3ADEV)
1 sibling, 1 reply; 16+ messages in thread
From: Albert ARIBAUD (3ADEV) @ 2018-06-14 13:51 UTC (permalink / raw)
To: libc-alpha; +Cc: Albert ARIBAUD (3ADEV)
This implies that its callers be 64-bit-time compatible too.
It is done by creating 64-bit-time versions of these and
turning their original 32-bit-time versions into wrappers
(at a slight execution time cost).
The callers affected are:
* localtime
* localtime_r
* ctime
* ctime_r
* gmtime
* gmtime_r
Note that in time/tzfile.c we do not need to check for time_t
overflows anymore as introduced by commit fc79706a323 since we
now use internal_time_t.
---
include/time.h | 36 +++++++++++++++++++++++++++++++-----
time/ctime.c | 20 +++++++++++++++++---
time/ctime_r.c | 20 +++++++++++++++++---
time/gmtime.c | 40 +++++++++++++++++++++++++++++++++++-----
time/localtime.c | 37 +++++++++++++++++++++++++++++++++----
time/offtime.c | 12 ++++++------
time/tzfile.c | 14 ++++----------
time/tzset.c | 30 ++++++++++++------------------
8 files changed, 155 insertions(+), 54 deletions(-)
diff --git a/include/time.h b/include/time.h
index fea072cbb6..b314317650 100644
--- a/include/time.h
+++ b/include/time.h
@@ -47,7 +47,7 @@ extern void __tzfile_default (const char *std, const char *dst,
long int stdoff, long int dstoff)
attribute_hidden;
extern void __tzset_parse_tz (const char *tz) attribute_hidden;
-extern void __tz_compute (time_t timer, struct tm *tm, int use_localtime)
+extern void __tz_compute (__time64_t timer, struct tm *tm, int use_localtime)
__THROW attribute_hidden;
/* Subroutine of `mktime'. Return the `time_t' representation of TP and
@@ -57,18 +57,44 @@ extern time_t __mktime_internal (struct tm *__tp,
struct tm *(*__func) (const time_t *,
struct tm *),
time_t *__offset) attribute_hidden;
+#if __TIMESIZE == 64
+# define __ctime64 ctime
+# define __ctime64_r ctime_r
+#endif
+
+#if __TIMESIZE == 64
+# define __localtime64 localtime
+#else
+extern struct tm *__localtime64 (const __time64_t *__timer);
+#endif
+
extern struct tm *__localtime_r (const time_t *__timer,
struct tm *__tp) attribute_hidden;
+#if __TIMESIZE == 64
+# define __localtime64_r __localtime_r
+#else
+extern struct tm *__localtime64_r (const __time64_t *__timer,
+ struct tm *__tp) attribute_hidden;
+#endif
+
extern struct tm *__gmtime_r (const time_t *__restrict __timer,
struct tm *__restrict __tp);
libc_hidden_proto (__gmtime_r)
-/* Compute the `struct tm' representation of *T,
+#if __TIMESIZE == 64
+# define __gmtime64 gmtime
+# define __gmtime64_r __gmtime_r
+#else
+extern struct tm *__gmtime64_r (const __time64_t *__restrict __timer,
+ struct tm *__restrict __tp);
+#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 (const time_t *__timer,
+extern int __offtime (const __time64_t __timer,
long int __offset,
struct tm *__tp) attribute_hidden;
@@ -77,8 +103,8 @@ extern char *__asctime_r (const struct tm *__tp, char *__buf)
extern void __tzset (void) attribute_hidden;
/* Prototype for the internal function to get information based on TZ. */
-extern struct tm *__tz_convert (const time_t *timer, int use_localtime,
- struct tm *tp) attribute_hidden;
+extern struct tm *__tz_convert (const __time64_t timer, int use_localtime,
+ struct tm *tp) attribute_hidden;
extern int __nanosleep (const struct timespec *__requested_time,
struct timespec *__remaining);
diff --git a/time/ctime.c b/time/ctime.c
index 1222614f29..ee98ed902e 100644
--- a/time/ctime.c
+++ b/time/ctime.c
@@ -16,13 +16,27 @@
<http://www.gnu.org/licenses/>. */
#include <time.h>
+#include <errno.h>
/* Return a string as returned by asctime which
is the representation of *T in that form. */
+char *
+__ctime64 (const __time64_t *t)
+{
+/* The C Standard says ctime (t) is equivalent to asctime (localtime (t)).
+ In particular, ctime and asctime must yield the same pointer. */
+ return asctime (__localtime64 (t));
+}
+
+/* Provide a 32-bit wrapper if needed */
+
+#if (__TIMESIZE != 64)
+
char *
ctime (const time_t *t)
{
- /* The C Standard says ctime (t) is equivalent to asctime (localtime (t)).
- In particular, ctime and asctime must yield the same pointer. */
- return asctime (localtime (t));
+ __time64_t t64 = *t;
+ return __ctime64 (&t64);
}
+
+#endif
diff --git a/time/ctime_r.c b/time/ctime_r.c
index c111146d76..d042adffce 100644
--- a/time/ctime_r.c
+++ b/time/ctime_r.c
@@ -18,12 +18,26 @@
<http://www.gnu.org/licenses/>. */
#include <time.h>
+#include <errno.h>
/* Return a string as returned by asctime which is the representation
- of *T in that form. Reentrant version. */
+ of *T in that form. */
char *
-ctime_r (const time_t *t, char *buf)
+__ctime64_r (const __time64_t *t, char *buf)
{
struct tm tm;
- return __asctime_r (__localtime_r (t, &tm), buf);
+ return __asctime_r (__localtime64_r (t, &tm), buf);
}
+
+/* Provide a 32-bit wrapper if needed */
+
+#if (__TIMESIZE != 64)
+
+char *
+ctime_r (const time_t *t, char *buf)
+{
+ __time64_t t64 = *t;
+ return __ctime64_r (&t64, buf);
+}
+
+#endif
diff --git a/time/gmtime.c b/time/gmtime.c
index dc33b3e68a..51560a5bab 100644
--- a/time/gmtime.c
+++ b/time/gmtime.c
@@ -17,21 +17,51 @@
<http://www.gnu.org/licenses/>. */
#include <time.h>
+#include <errno.h>
+
+/* Return the `struct tm' representation of 64-bit-time *T
+ in UTC, using *TP to store the result. */
+struct tm *
+__gmtime64_r (const __time64_t *t, struct tm *tp)
+{
+ return __tz_convert (*t, 0, tp);
+}
+
+/* Provide a 32-bit wrapper if needed */
+
+#if (__TIMESIZE != 64)
-/* Return the `struct tm' representation of *T in UTC,
- using *TP to store the result. */
struct tm *
__gmtime_r (const time_t *t, struct tm *tp)
{
- return __tz_convert (t, 0, tp);
+ __time64_t t64 = *t;
+ return __gmtime64_r (&t64, tp);
}
+
+#endif
+
+/* This always works because either __TIMESIZE != 64 and __gmtime_r exists
+ or __TIMESIZE == 64 and the definition of __gmtime64_r above actually
+ defined __gmtime_r. */
libc_hidden_def (__gmtime_r)
weak_alias (__gmtime_r, gmtime_r)
+/* Return the `struct tm' representation of 64-bit-time *T in UTC. */
+struct tm *
+__gmtime64 (const __time64_t *t)
+{
+ return __tz_convert (*t, 0, &_tmbuf);
+}
+
+/* Provide a 32-bit wrapper if needed */
+
+#if (__TIMESIZE != 64)
-/* Return the `struct tm' representation of *T in UTC. */
struct tm *
gmtime (const time_t *t)
{
- return __tz_convert (t, 0, &_tmbuf);
+ __time64_t t64 = *t;
+ return __gmtime64 (&t64);
}
+
+#endif
diff --git a/time/localtime.c b/time/localtime.c
index 8684a8a971..9794d8c28c 100644
--- a/time/localtime.c
+++ b/time/localtime.c
@@ -17,25 +17,54 @@
<http://www.gnu.org/licenses/>. */
#include <time.h>
+#include <errno.h>
/* The C Standard says that localtime and gmtime return the same pointer. */
struct tm _tmbuf;
-
/* Return the `struct tm' representation of *T in local time,
using *TP to store the result. */
+struct tm *
+__localtime64_r (const __time64_t *t, struct tm *tp)
+{
+ return __tz_convert (*t, 1, tp);
+}
+
+/* Provide a 32-bit wrapper if needed */
+
+#if (__TIMESIZE != 64)
+
struct tm *
__localtime_r (const time_t *t, struct tm *tp)
{
- return __tz_convert (t, 1, tp);
+ __time64_t t64 = *t;
+ return __localtime64_r (&t64, tp);
}
-weak_alias (__localtime_r, localtime_r)
+#endif
+
+/* This always works because either __TIMESIZE != 64 and __localtime_r
+ exists or __TIMESIZE == 64 and the definition of __localtime64_r above
+ actually defined __localtime_r. */
+weak_alias (__localtime_r, localtime_r)
/* Return the `struct tm' representation of *T in local time. */
+struct tm *
+__localtime64 (const __time64_t *t)
+{
+ return __tz_convert (*t, 1, &_tmbuf);
+}
+
+/* Provide a 32-bit wrapper if needed */
+
+#if (__TIMESIZE != 64)
+
struct tm *
localtime (const time_t *t)
{
- return __tz_convert (t, 1, &_tmbuf);
+ __time64_t t64 = *t;
+ return __localtime64 (&t64);
}
libc_hidden_def (localtime)
+
+#endif
diff --git a/time/offtime.c b/time/offtime.c
index 04c48389fc..ede23c418f 100644
--- a/time/offtime.c
+++ b/time/offtime.c
@@ -21,18 +21,18 @@
#define SECS_PER_HOUR (60 * 60)
#define SECS_PER_DAY (SECS_PER_HOUR * 24)
-/* Compute the `struct tm' representation of *T,
+/* 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. */
int
-__offtime (const time_t *t, long int offset, struct tm *tp)
+__offtime (const __time64_t t, long int offset, struct tm *tp)
{
- time_t days, rem, y;
+ __time64_t days, rem, y;
const unsigned short int *ip;
- days = *t / SECS_PER_DAY;
- rem = *t % SECS_PER_DAY;
+ days = t / SECS_PER_DAY;
+ rem = t % SECS_PER_DAY;
rem += offset;
while (rem < 0)
{
@@ -60,7 +60,7 @@ __offtime (const time_t *t, long int offset, struct tm *tp)
while (days < 0 || days >= (__isleap (y) ? 366 : 365))
{
/* Guess a corrected year, assuming 365 days per year. */
- time_t yg = y + days / 365 - (days % 365 < 0);
+ __time64_t yg = y + days / 365 - (days % 365 < 0);
/* Adjust DAYS and Y to match the guessed year. */
days -= ((yg - y) * 365
diff --git a/time/tzfile.c b/time/tzfile.c
index d7e391c3a3..972e3ff5cf 100644
--- a/time/tzfile.c
+++ b/time/tzfile.c
@@ -635,16 +635,10 @@ __tzfile_compute (__time64_t timer, int use_localtime,
/* Convert to broken down structure. If this fails do not
use the string. */
- {
- time_t truncated = timer;
- if (__glibc_unlikely (truncated != timer
- || ! __offtime (&truncated, 0, tp)))
- goto use_last;
- }
-
- /* Use the rules from the TZ string to compute the change.
- timer fits into time_t due to the truncation check
- above. */
+ if (__glibc_unlikely (! __offtime (timer, 0, tp)))
+ goto use_last;
+
+ /* Use the rules from the TZ string to compute the change. */
__tz_compute (timer, tp, 1);
/* If tzspec comes from posixrules loaded by __tzfile_default,
diff --git a/time/tzset.c b/time/tzset.c
index a828b9fb75..4e91d9dca6 100644
--- a/time/tzset.c
+++ b/time/tzset.c
@@ -16,7 +16,6 @@
<http://www.gnu.org/licenses/>. */
#include <ctype.h>
-#include <errno.h>
#include <libc-lock.h>
#include <stdbool.h>
#include <stddef.h>
@@ -27,7 +26,7 @@
#include <timezone/tzfile.h>
-#define SECSPERDAY ((time_t) 86400)
+#define SECSPERDAY ((__time64_t) 86400)
char *__tzname[2] = { (char *) "GMT", (char *) "GMT" };
int __daylight = 0;
@@ -55,7 +54,7 @@ typedef struct
/* We cache the computed time of change for a
given year so we don't have to recompute it. */
- time_t change; /* When to change to this zone. */
+ __time64_t change; /* When to change to this zone. */
int computed_for; /* Year above is computed for. */
} tz_rule;
@@ -416,7 +415,7 @@ tzset_internal (int always)
tz_rules[0].name = tz_rules[1].name = "UTC";
if (J0 != 0)
tz_rules[0].type = tz_rules[1].type = J0;
- tz_rules[0].change = tz_rules[1].change = (time_t) -1;
+ tz_rules[0].change = tz_rules[1].change = -1;
update_vars ();
return;
}
@@ -424,13 +423,13 @@ tzset_internal (int always)
__tzset_parse_tz (tz);
}
\f
-/* Figure out the exact time (as a time_t) in YEAR
+/* Figure out the exact time (as a __time64_t) in YEAR
when the change described by RULE will occur and
put it in RULE->change, saving YEAR in RULE->computed_for. */
static void
compute_change (tz_rule *rule, int year)
{
- time_t t;
+ __time64_t t;
if (year != -1 && rule->computed_for == year)
/* Operations on times in 2 BC will be slower. Oh well. */
@@ -514,9 +513,10 @@ compute_change (tz_rule *rule, int year)
/* Figure out the correct timezone for TM and set `__tzname',
- `__timezone', and `__daylight' accordingly. */
+ `__timezone', and `__daylight' accordingly.
+ NOTE: this takes a __time64_t value, so passing a time_t value is OK. */
void
-__tz_compute (time_t timer, struct tm *tm, int use_localtime)
+__tz_compute (__time64_t timer, struct tm *tm, int use_localtime)
{
compute_change (&tz_rules[0], 1900 + tm->tm_year);
compute_change (&tz_rules[1], 1900 + tm->tm_year);
@@ -562,20 +562,14 @@ __tzset (void)
}
weak_alias (__tzset, tzset)
\f
-/* Return the `struct tm' representation of *TIMER in the local timezone.
+/* Return the `struct tm' representation of TIMER in the local timezone.
Use local time if USE_LOCALTIME is nonzero, UTC otherwise. */
struct tm *
-__tz_convert (const time_t *timer, int use_localtime, struct tm *tp)
+__tz_convert (const __time64_t timer, int use_localtime, struct tm *tp)
{
long int leap_correction;
int leap_extra_secs;
- if (timer == NULL)
- {
- __set_errno (EINVAL);
- return NULL;
- }
-
__libc_lock_lock (tzset_lock);
/* Update internal database according to current TZ setting.
@@ -584,14 +578,14 @@ __tz_convert (const time_t *timer, int use_localtime, struct tm *tp)
tzset_internal (tp == &_tmbuf && use_localtime);
if (__use_tzfile)
- __tzfile_compute (*timer, use_localtime, &leap_correction,
+ __tzfile_compute (timer, use_localtime, &leap_correction,
&leap_extra_secs, tp);
else
{
if (! __offtime (timer, 0, tp))
tp = NULL;
else
- __tz_compute (*timer, tp, use_localtime);
+ __tz_compute (timer, tp, use_localtime);
leap_correction = 0L;
leap_extra_secs = 0;
}
--
2.17.1
^ permalink raw reply [flat|nested] 16+ messages in thread
* [PATCH v2 1/2] Y2038: Add 64-bit time for all architectures
2018-06-14 13:51 [PATCH v2 0/2] Y2038 support batch 1 - __time64_t and __tz_convert Albert ARIBAUD (3ADEV)
2018-06-14 13:51 ` [PATCH v2 2/2] Y2038: make __tz_convert compatible with 64-bit-time Albert ARIBAUD (3ADEV)
@ 2018-06-14 13:51 ` Albert ARIBAUD (3ADEV)
2018-06-14 13:57 ` Joseph Myers
` (2 more replies)
1 sibling, 3 replies; 16+ messages in thread
From: Albert ARIBAUD (3ADEV) @ 2018-06-14 13:51 UTC (permalink / raw)
To: libc-alpha; +Cc: Albert ARIBAUD (3ADEV)
* Add macro __TIMESIZE equal to the bit size of time_t.
It equals the architecture __WORDSIZE except for x32
where it equals 64.
* Add type __time64_t which is always 64-bit. On 64-bit
architectures and on x32, it is #defined as time_t.
On other architectures, it has its own type.
* Replace all occurrences of internal_time_t with
__time64_t.
The __time64_t type is public so that the public time_t type
can be a typedef or #define of __time64_t when we switch the
public API to 64-bit time.
Also, provide a function (inline) to check if a __time64_t
value fits in a (possibly 32-bit) time_t. This is used when
a 32-bit-time wrapper calls a glibc function which returns
a __time64_t, so that the wrapper can detect times which
it cannot properly return to its caller, and can flag an
EOVERFLOW accordingly.
---
bits/timesize.h | 23 ++++++++++++
bits/timesizes.h | 37 ++++++++++++++++++++
include/sys/types.h | 1 +
include/time.h | 21 +++++++----
posix/bits/types.h | 8 +++++
stdlib/Makefile | 2 +-
sysdeps/unix/sysv/linux/x86/bits/timesizes.h | 32 +++++++++++++++++
sysdeps/x86/bits/timesize.h | 21 +++++++++++
time/tzfile.c | 18 +++++-----
9 files changed, 147 insertions(+), 16 deletions(-)
create mode 100644 bits/timesize.h
create mode 100644 bits/timesizes.h
create mode 100644 sysdeps/unix/sysv/linux/x86/bits/timesizes.h
create mode 100644 sysdeps/x86/bits/timesize.h
diff --git a/bits/timesize.h b/bits/timesize.h
new file mode 100644
index 0000000000..58eb22d6f6
--- /dev/null
+++ b/bits/timesize.h
@@ -0,0 +1,23 @@
+/* Bit size of the time_t type at glibc build time, general case.
+ Copyright (C) 2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <bits/wordsize.h> // for __WORDSIZE
+
+/* Size in bits of the 'time_t' type; equals __WORDSIZE except for x32 */
+#define __TIMESIZE __WORDSIZE
diff --git a/bits/timesizes.h b/bits/timesizes.h
new file mode 100644
index 0000000000..e279b15cd8
--- /dev/null
+++ b/bits/timesizes.h
@@ -0,0 +1,37 @@
+/* bits/timesizes.h -- underlying types for __time64_t. Generic version.
+ Copyright (C) 2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _BITS_TYPES_H
+# error "Never include <bits/timesizes.h> directly; use <sys/types.h> instead."
+#endif
+
+#ifndef _BITS_TIMESIZES_H
+#define _BITS_TIMESIZES_H 1
+
+/* See <bits/types.h> for the meaning of these macros. This file exists so
+ that <bits/types.h> need not vary across different GNU platforms. */
+
+#if __TIMESIZE == 64
+/* If we already have 64-bit time then use it */
+#define __TIME64_T_TYPE __TIME_T_TYPE
+#else
+/* Define a 64-bit type alongsize the 32-bit one */
+#define __TIME64_T_TYPE __SQUAD_TYPE
+#endif
+
+#endif /* bits/timesizes.h */
diff --git a/include/sys/types.h b/include/sys/types.h
index 716732f4d4..107b0672ac 100644
--- a/include/sys/types.h
+++ b/include/sys/types.h
@@ -1 +1,2 @@
#include <posix/sys/types.h>
+#include <bits/timesizes.h>
diff --git a/include/time.h b/include/time.h
index 23d2580528..fea072cbb6 100644
--- a/include/time.h
+++ b/include/time.h
@@ -3,6 +3,7 @@
#ifndef _ISOMAC
# include <bits/types/locale_t.h>
+# include <stdbool.h>
extern __typeof (strftime_l) __strftime_l;
libc_hidden_proto (__strftime_l)
@@ -26,10 +27,6 @@ extern __typeof (clock_getcpuclockid) __clock_getcpuclockid;
/* Now define the internal interfaces. */
struct tm;
-/* time_t variant for representing time zone data, independent of
- time_t. */
-typedef __int64_t internal_time_t;
-
/* Defined in mktime.c. */
extern const unsigned short int __mon_yday[2][13] attribute_hidden;
@@ -43,7 +40,7 @@ extern int __use_tzfile attribute_hidden;
extern void __tzfile_read (const char *file, size_t extra,
char **extrap) attribute_hidden;
-extern void __tzfile_compute (internal_time_t timer, int use_localtime,
+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,
@@ -101,10 +98,22 @@ extern char * __strptime_internal (const char *rp, const char *fmt,
extern double __difftime (time_t time1, time_t time0);
-
/* Use in the clock_* functions. Size of the field representing the
actual clock ID. */
#define CLOCK_IDFIELD_SIZE 3
+/* check whether a time64_t value fits in a time_t */
+# if __TIMESIZE == 64
+/* __time64_t is time_t, so it always fits_in_time_t */
+# define fits_in_time_t(x) 1
+# else
+/* Not all __time64_t values can fit; check by type-casting */
+static inline bool
+fits_in_time_t (__time64_t t)
+{
+ return t == (time_t) t;
+}
+# endif
+
#endif
#endif
diff --git a/posix/bits/types.h b/posix/bits/types.h
index 5e22ce41bf..0c7289faf8 100644
--- a/posix/bits/types.h
+++ b/posix/bits/types.h
@@ -25,6 +25,7 @@
#include <features.h>
#include <bits/wordsize.h>
+#include <bits/timesize.h>
/* Convenience types. */
typedef unsigned char __u_char;
@@ -138,6 +139,7 @@ __extension__ typedef unsigned long long int __uintmax_t;
# error
#endif
#include <bits/typesizes.h> /* Defines __*_T_TYPE macros. */
+#include <bits/timesizes.h> /* Defines __TIME*_T_TYPE macros. */
__STD_TYPE __DEV_T_TYPE __dev_t; /* Type of device numbers. */
@@ -211,6 +213,12 @@ __STD_TYPE __U32_TYPE __socklen_t;
It is not currently necessary for this to be machine-specific. */
typedef int __sig_atomic_t;
+#if __TIMESIZE == 64
+# define __time64_t time_t
+#else
+__STD_TYPE __TIME64_T_TYPE __time64_t; /* Seconds since the Epoch (_TIME_BITS==64). */
+#endif
+
#undef __STD_TYPE
#endif /* bits/types.h */
diff --git a/stdlib/Makefile b/stdlib/Makefile
index bf1fbd4a3a..4c6e541f77 100644
--- a/stdlib/Makefile
+++ b/stdlib/Makefile
@@ -29,7 +29,7 @@ headers := stdlib.h bits/stdlib.h bits/stdlib-ldbl.h bits/stdlib-float.h \
ucontext.h sys/ucontext.h \
alloca.h fmtmsg.h \
bits/stdlib-bsearch.h sys/random.h bits/stdint-intn.h \
- bits/stdint-uintn.h
+ bits/stdint-uintn.h bits/timesizes.h bits/timesize.h \
routines := \
atof atoi atol atoll \
diff --git a/sysdeps/unix/sysv/linux/x86/bits/timesizes.h b/sysdeps/unix/sysv/linux/x86/bits/timesizes.h
new file mode 100644
index 0000000000..785beab183
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86/bits/timesizes.h
@@ -0,0 +1,32 @@
+/* bits/typesizes.h -- underlying types for __time64_t. Linux/x86-64 version.
+ Copyright (C) 2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _BITS_TYPES_H
+# error "Never include <bits/timesizes.h> directly; use <sys/types.h> instead."
+#endif
+
+#ifndef _BITS_TIMESIZES_H
+#define _BITS_TIMESIZES_H 1
+
+/* See <bits/types.h> for the meaning of these macros. This file exists so
+ that <bits/types.h> need not vary across different GNU platforms. */
+
+/* Both x86-64 and x32 use 64-bit time. */
+#define __TIME64_T_TYPE __TIME_T_TYPE
+
+#endif /* bits/timesizes.h */
diff --git a/sysdeps/x86/bits/timesize.h b/sysdeps/x86/bits/timesize.h
new file mode 100644
index 0000000000..8974d81102
--- /dev/null
+++ b/sysdeps/x86/bits/timesize.h
@@ -0,0 +1,21 @@
+/* Bit size of the time_t type at glibc build time, x86-64 and x32 case.
+ Copyright (C) 2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+/* Both x86-64 and x32 use 64-bit time. */
+#define __TIMESIZE 64
diff --git a/time/tzfile.c b/time/tzfile.c
index 2a385b92bc..d7e391c3a3 100644
--- a/time/tzfile.c
+++ b/time/tzfile.c
@@ -44,12 +44,12 @@ struct ttinfo
struct leap
{
- internal_time_t transition; /* Time the transition takes effect. */
+ __time64_t transition; /* Time the transition takes effect. */
long int change; /* Seconds of correction to apply. */
};
static size_t num_transitions;
-libc_freeres_ptr (static internal_time_t *transitions);
+libc_freeres_ptr (static __time64_t *transitions);
static unsigned char *type_idxs;
static size_t num_types;
static struct ttinfo *types;
@@ -113,8 +113,8 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
size_t tzspec_len;
char *new = NULL;
- _Static_assert (sizeof (internal_time_t) == 8,
- "internal_time_t must be eight bytes");
+ _Static_assert (sizeof (__time64_t) == 8,
+ "__time64_t must be eight bytes");
__use_tzfile = 0;
@@ -220,9 +220,9 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
if (__builtin_expect (num_transitions
> ((SIZE_MAX - (__alignof__ (struct ttinfo) - 1))
- / (sizeof (internal_time_t) + 1)), 0))
+ / (sizeof (__time64_t) + 1)), 0))
goto lose;
- total_size = num_transitions * (sizeof (internal_time_t) + 1);
+ total_size = num_transitions * (sizeof (__time64_t) + 1);
total_size = ((total_size + __alignof__ (struct ttinfo) - 1)
& ~(__alignof__ (struct ttinfo) - 1));
types_idx = total_size;
@@ -279,7 +279,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
goto lose;
type_idxs = (unsigned char *) transitions + (num_transitions
- * sizeof (internal_time_t));
+ * sizeof (__time64_t));
types = (struct ttinfo *) ((char *) transitions + types_idx);
zone_names = (char *) types + num_types * sizeof (struct ttinfo);
leaps = (struct leap *) ((char *) transitions + leaps_idx);
@@ -580,7 +580,7 @@ __tzfile_default (const char *std, const char *dst,
}
\f
void
-__tzfile_compute (internal_time_t timer, int use_localtime,
+__tzfile_compute (__time64_t timer, int use_localtime,
long int *leap_correct, int *leap_hit,
struct tm *tp)
{
@@ -669,7 +669,7 @@ __tzfile_compute (internal_time_t timer, int use_localtime,
initial search spot from it. Half of a gregorian year
has on average 365.2425 * 86400 / 2 = 15778476 seconds.
The value i can be truncated if size_t is smaller than
- internal_time_t, but this is harmless because it is just
+ __time64_t, but this is harmless because it is just
a guess. */
i = (transitions[num_transitions - 1] - timer) / 15778476;
if (i < num_transitions)
--
2.17.1
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v2 1/2] Y2038: Add 64-bit time for all architectures
2018-06-14 13:51 ` [PATCH v2 1/2] Y2038: Add 64-bit time for all architectures Albert ARIBAUD (3ADEV)
@ 2018-06-14 13:57 ` Joseph Myers
2018-06-14 18:51 ` Albert ARIBAUD
2018-06-14 16:56 ` Paul Eggert
2018-07-30 5:38 ` Ben Hutchings
2 siblings, 1 reply; 16+ messages in thread
From: Joseph Myers @ 2018-06-14 13:57 UTC (permalink / raw)
To: Albert ARIBAUD (3ADEV); +Cc: libc-alpha
On Thu, 14 Jun 2018, Albert ARIBAUD (3ADEV) wrote:
> diff --git a/include/sys/types.h b/include/sys/types.h
> index 716732f4d4..107b0672ac 100644
> --- a/include/sys/types.h
> +++ b/include/sys/types.h
> @@ -1 +1,2 @@
> #include <posix/sys/types.h>
> +#include <bits/timesizes.h>
include/ wrappers should include the installed header and do nothing more
in the _ISOMAC case. For this header you shouldn't need any !_ISOMAC case
to include more, because sys/types.h includes bits/types.h and you've
already put a bits/timesizes.h include in there.
So no change to include/sys/types.h should be needed at all.
--
Joseph S. Myers
joseph@codesourcery.com
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v2 1/2] Y2038: Add 64-bit time for all architectures
2018-06-14 13:51 ` [PATCH v2 1/2] Y2038: Add 64-bit time for all architectures Albert ARIBAUD (3ADEV)
2018-06-14 13:57 ` Joseph Myers
@ 2018-06-14 16:56 ` Paul Eggert
2018-06-14 17:52 ` Albert ARIBAUD
2018-07-30 5:38 ` Ben Hutchings
2 siblings, 1 reply; 16+ messages in thread
From: Paul Eggert @ 2018-06-14 16:56 UTC (permalink / raw)
To: Albert ARIBAUD (3ADEV), libc-alpha
On 06/14/2018 06:51 AM, Albert ARIBAUD (3ADEV) wrote:
> +/* check whether a time64_t value fits in a time_t */
> +# if __TIMESIZE == 64
> +/* __time64_t is time_t, so it always fits_in_time_t */
> +# define fits_in_time_t(x) 1
> +# else
> +/* Not all __time64_t values can fit; check by type-casting */
> +static inline bool
> +fits_in_time_t (__time64_t t)
> +{
> + return t == (time_t) t;
> +}
> +# endif
Don't bother with the "#if". Just have the static function
unconditionally. It should generate zero instructions if time_t is 64 bits.
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v2 2/2] Y2038: make __tz_convert compatible with 64-bit-time
2018-06-14 13:51 ` [PATCH v2 2/2] Y2038: make __tz_convert compatible with 64-bit-time Albert ARIBAUD (3ADEV)
@ 2018-06-14 17:07 ` Paul Eggert
2018-06-14 17:52 ` Albert ARIBAUD
0 siblings, 1 reply; 16+ messages in thread
From: Paul Eggert @ 2018-06-14 17:07 UTC (permalink / raw)
To: Albert ARIBAUD (3ADEV), libc-alpha
On 06/14/2018 06:51 AM, Albert ARIBAUD (3ADEV) wrote:
> +#if __TIMESIZE == 64
> +# define __ctime64 ctime
> +# define __ctime64_r ctime_r
> +#endif
> +
> +#if __TIMESIZE == 64
> +# define __localtime64 localtime
> +#else
> +extern struct tm *__localtime64 (const __time64_t *__timer);
> +#endif
These don't seem symmetric. Why don't we need an extern declaration for
__ctime_64 or for __ctime_64_r? If the code is correct, maybe a comment why?
> +#if (__TIMESIZE != 64)
No parentheses here (and similarly elsewhere).
+/* The C Standard says ctime (t) is equivalent to asctime (localtime (t)).
+ In particular, ctime and asctime must yield the same pointer. */
+ return asctime (__localtime64 (t));
Please indent the comment to be like what it was before.
Otherwise looks good; thanks.
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v2 2/2] Y2038: make __tz_convert compatible with 64-bit-time
2018-06-14 17:07 ` Paul Eggert
@ 2018-06-14 17:52 ` Albert ARIBAUD
2018-06-14 18:52 ` Paul Eggert
0 siblings, 1 reply; 16+ messages in thread
From: Albert ARIBAUD @ 2018-06-14 17:52 UTC (permalink / raw)
To: Paul Eggert; +Cc: libc-alpha
Hi Paul,
On Thu, 14 Jun 2018 10:07:18 -0700, Paul Eggert <eggert@cs.ucla.edu>
wrote :
> On 06/14/2018 06:51 AM, Albert ARIBAUD (3ADEV) wrote:
> > +#if __TIMESIZE == 64
> > +# define __ctime64 ctime
> > +# define __ctime64_r ctime_r
> > +#endif
> > +
> > +#if __TIMESIZE == 64
> > +# define __localtime64 localtime
> > +#else
> > +extern struct tm *__localtime64 (const __time64_t *__timer);
> > +#endif
>
> These don't seem symmetric. Why don't we need an extern declaration for
> __ctime_64 or for __ctime_64_r? If the code is correct, maybe a comment why?
The asymmetry (that ctime and ctime_r are only declared in time/time.h
whereas localtime, localtime_r, gmtime and gmtime_r are declared both in
include/time.h as well as time/time.h) existed before my patches, and I
do not know the reason.
I felt I should not add declarations for ctime / ctime_r in
include/time as obviously glibc builds fine without these, and my
patches are not about adding 32-bit declarations but about adding
64-bit support.
However, I can add them if requested.
> > +#if (__TIMESIZE != 64)
> No parentheses here (and similarly elsewhere).
Fixed everywhere.
> +/* The C Standard says ctime (t) is equivalent to asctime (localtime (t)).
> + In particular, ctime and asctime must yield the same pointer. */
> + return asctime (__localtime64 (t));
>
> Please indent the comment to be like what it was before.
Done.
> Otherwise looks good; thanks.
Thanks to you for the reviews!
Cordialement,
Albert ARIBAUD
3ADEV
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v2 1/2] Y2038: Add 64-bit time for all architectures
2018-06-14 16:56 ` Paul Eggert
@ 2018-06-14 17:52 ` Albert ARIBAUD
0 siblings, 0 replies; 16+ messages in thread
From: Albert ARIBAUD @ 2018-06-14 17:52 UTC (permalink / raw)
To: Paul Eggert; +Cc: libc-alpha
Hi Paul,
On Thu, 14 Jun 2018 09:56:03 -0700, Paul Eggert <eggert@cs.ucla.edu>
wrote :
> On 06/14/2018 06:51 AM, Albert ARIBAUD (3ADEV) wrote:
> > +/* check whether a time64_t value fits in a time_t */
> > +# if __TIMESIZE == 64
> > +/* __time64_t is time_t, so it always fits_in_time_t */
> > +# define fits_in_time_t(x) 1
> > +# else
> > +/* Not all __time64_t values can fit; check by type-casting */
> > +static inline bool
> > +fits_in_time_t (__time64_t t)
> > +{
> > + return t == (time_t) t;
> > +}
> > +# endif
>
> Don't bother with the "#if". Just have the static function
> unconditionally. It should generate zero instructions if time_t is 64 bits.
Done, thanks.
Cordialement,
Albert ARIBAUD
3ADEV
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v2 1/2] Y2038: Add 64-bit time for all architectures
2018-06-14 13:57 ` Joseph Myers
@ 2018-06-14 18:51 ` Albert ARIBAUD
0 siblings, 0 replies; 16+ messages in thread
From: Albert ARIBAUD @ 2018-06-14 18:51 UTC (permalink / raw)
To: Joseph Myers; +Cc: libc-alpha
Hi Joseph,
On Thu, 14 Jun 2018 13:57:16 +0000, Joseph Myers
<joseph@codesourcery.com> wrote :
> On Thu, 14 Jun 2018, Albert ARIBAUD (3ADEV) wrote:
>
> > diff --git a/include/sys/types.h b/include/sys/types.h
> > index 716732f4d4..107b0672ac 100644
> > --- a/include/sys/types.h
> > +++ b/include/sys/types.h
> > @@ -1 +1,2 @@
> > #include <posix/sys/types.h>
> > +#include <bits/timesizes.h>
>
> include/ wrappers should include the installed header and do nothing more
> in the _ISOMAC case. For this header you shouldn't need any !_ISOMAC case
> to include more, because sys/types.h includes bits/types.h and you've
> already put a bits/timesizes.h include in there.
>
> So no change to include/sys/types.h should be needed at all.
Fixed, thanks.
Cordialement,
Albert ARIBAUD
3ADEV
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v2 2/2] Y2038: make __tz_convert compatible with 64-bit-time
2018-06-14 17:52 ` Albert ARIBAUD
@ 2018-06-14 18:52 ` Paul Eggert
2018-06-14 19:40 ` Joseph Myers
0 siblings, 1 reply; 16+ messages in thread
From: Paul Eggert @ 2018-06-14 18:52 UTC (permalink / raw)
To: Albert ARIBAUD; +Cc: libc-alpha
On 06/14/2018 10:51 AM, Albert ARIBAUD wrote:
> The asymmetry (that ctime and ctime_r are only declared in time/time.h
> whereas localtime, localtime_r, gmtime and gmtime_r are declared both in
> include/time.h as well as time/time.h) existed before my patches, and I
> do not know the reason.
I suspect it's because time/time.h is intended to be public (copied to
/usr/include/time.h) whereas include/time.h is merely private to glibc.
Since ctime and ctime_r are not useful internally (they are
specializations of strftime that are standardized only because of
inertia: 7th Edition Unix had ctime but not strftime), there is no need
for private declarations of ctime and ctime_r in include/time.h because
glibc code never calls these functions.
Given all that, why bother defining __ctime64 and __ctime64_r in
include/time.h? glibc code never calls these functions so these #defines
can be localized to time/ctime.c and time/ctime_r.c respectively, with a
comment explaining why the #defines are local.
Also, isn't glibc a bit busted in this area? ctime_r is not part of
standard C, so why isn't ctime_r treated like asctime_r, with a weak
alias? Isn't this a (separate) bug that needs to be fixed, so that the
resulting weak alias is like the one for localtime_r as far as 64-bit
times is concerned?
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v2 2/2] Y2038: make __tz_convert compatible with 64-bit-time
2018-06-14 18:52 ` Paul Eggert
@ 2018-06-14 19:40 ` Joseph Myers
2018-06-16 14:03 ` Albert ARIBAUD
0 siblings, 1 reply; 16+ messages in thread
From: Joseph Myers @ 2018-06-14 19:40 UTC (permalink / raw)
To: Paul Eggert; +Cc: Albert ARIBAUD, libc-alpha
On Thu, 14 Jun 2018, Paul Eggert wrote:
> Also, isn't glibc a bit busted in this area? ctime_r is not part of standard
> C, so why isn't ctime_r treated like asctime_r, with a weak alias? Isn't this
> a (separate) bug that needs to be fixed, so that the resulting weak alias is
> like the one for localtime_r as far as 64-bit times is concerned?
localtime_r is defined in the same file as localtime, so needs to be weak.
ctime_r is not defined in the same file as ctime, and is not referenced by
the implementations of any standard C functions, so does not need to be
weak. (If it were referenced by a standard C function, the reference
would have to be to __ctime_r and ctime_r would have to be a weak alias of
that.)
--
Joseph S. Myers
joseph@codesourcery.com
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v2 2/2] Y2038: make __tz_convert compatible with 64-bit-time
2018-06-14 19:40 ` Joseph Myers
@ 2018-06-16 14:03 ` Albert ARIBAUD
2018-06-16 14:23 ` Paul Eggert
0 siblings, 1 reply; 16+ messages in thread
From: Albert ARIBAUD @ 2018-06-16 14:03 UTC (permalink / raw)
To: Joseph Myers; +Cc: Paul Eggert, libc-alpha
Hi Joseph,
On Thu, 14 Jun 2018 19:40:28 +0000, Joseph Myers
<joseph@codesourcery.com> wrote :
> On Thu, 14 Jun 2018, Paul Eggert wrote:
>
> > Also, isn't glibc a bit busted in this area? ctime_r is not part of standard
> > C, so why isn't ctime_r treated like asctime_r, with a weak alias? Isn't this
> > a (separate) bug that needs to be fixed, so that the resulting weak alias is
> > like the one for localtime_r as far as 64-bit times is concerned?
>
> localtime_r is defined in the same file as localtime, so needs to be weak.
> ctime_r is not defined in the same file as ctime, and is not referenced by
> the implementations of any standard C functions, so does not need to be
> weak. (If it were referenced by a standard C function, the reference
> would have to be to __ctime_r and ctime_r would have to be a weak alias of
> that.)
>
Well, I can tell that if I remove the __ctime64 and __ctime64_r defines
and then build glibc for x86_64-linux-gnu, the linker stage fails due to
nis/nis_print.c lines 336 and 338 referring to an undefined ctime().
(OTOH, ctime_r is not referred to at all in glibc)
So at least I need to keep the '#define __ctime64 ctime' line -- I will
add a comment above it indicating that nis/nos_print.c needs it, and I
will remove the __ctime64_r define.
Cordialement,
Albert ARIBAUD
3ADEV
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v2 2/2] Y2038: make __tz_convert compatible with 64-bit-time
2018-06-16 14:03 ` Albert ARIBAUD
@ 2018-06-16 14:23 ` Paul Eggert
2018-06-16 18:21 ` Albert ARIBAUD
0 siblings, 1 reply; 16+ messages in thread
From: Paul Eggert @ 2018-06-16 14:23 UTC (permalink / raw)
To: Albert ARIBAUD, Joseph Myers; +Cc: libc-alpha
Albert ARIBAUD wrote:
> if I remove the __ctime64 and __ctime64_r defines
> and then build glibc for x86_64-linux-gnu, the linker stage fails due to
> nis/nis_print.c lines 336 and 338 referring to an undefined ctime().
How about if we fix nis/nis_print.c to use localtime_r and strftime instead of
ctime? ctime is not thread-safe, and ctime_r is problematic due to the potential
problem of overrunning its output buffer when given outlandish timestamps, so
such a fix should be made regardless of the Y2038 changes.
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v2 2/2] Y2038: make __tz_convert compatible with 64-bit-time
2018-06-16 14:23 ` Paul Eggert
@ 2018-06-16 18:21 ` Albert ARIBAUD
0 siblings, 0 replies; 16+ messages in thread
From: Albert ARIBAUD @ 2018-06-16 18:21 UTC (permalink / raw)
To: Paul Eggert; +Cc: Joseph Myers, libc-alpha
Hi Paul,
On Sat, 16 Jun 2018 07:23:29 -0700, Paul Eggert <eggert@cs.ucla.edu>
wrote :
> Albert ARIBAUD wrote:
> > if I remove the __ctime64 and __ctime64_r defines
> > and then build glibc for x86_64-linux-gnu, the linker stage fails due to
> > nis/nis_print.c lines 336 and 338 referring to an undefined ctime().
>
> How about if we fix nis/nis_print.c to use localtime_r and strftime instead of
> ctime? ctime is not thread-safe, and ctime_r is problematic due to the potential
> problem of overrunning its output buffer when given outlandish timestamps, so
> such a fix should be made regardless of the Y2038 changes.
I can do this in a further patch if/when that's agreed upon.
Cordialement,
Albert ARIBAUD
3ADEV
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v2 1/2] Y2038: Add 64-bit time for all architectures
2018-06-14 13:51 ` [PATCH v2 1/2] Y2038: Add 64-bit time for all architectures Albert ARIBAUD (3ADEV)
2018-06-14 13:57 ` Joseph Myers
2018-06-14 16:56 ` Paul Eggert
@ 2018-07-30 5:38 ` Ben Hutchings
2018-07-30 5:41 ` Ben Hutchings
2 siblings, 1 reply; 16+ messages in thread
From: Ben Hutchings @ 2018-07-30 5:38 UTC (permalink / raw)
To: Albert ARIBAUD (3ADEV), libc-alpha
On Thu, 2018-06-14 at 15:51 +0200, Albert ARIBAUD (3ADEV) wrote:
> * Add macro __TIMESIZE equal to the bit size of time_t.
> Â It equals the architecture __WORDSIZE except for x32
> Â where it equals 64.
>
> * Add type __time64_t which is always 64-bit. On 64-bit
> Â architectures and on x32, it is #defined as time_t.
> Â On other architectures, it has its own type.
[...]
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/x86/bits/timesizes.h
[...]
> +/* Both x86-64 and x32 use 64-bit time.  */
> +#define __TIME64_T_TYPE __TIME_T_TYPE
[...]
But won't this file be used for regular 32-bit x86 (i386/i686) as well?
Ben.
--
Ben Hutchings, Software Developer  Codethink Ltd
https://www.codethink.co.uk/ Dale House, 35 Dale Street
Manchester, M1 2HF, United Kingdom
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH v2 1/2] Y2038: Add 64-bit time for all architectures
2018-07-30 5:38 ` Ben Hutchings
@ 2018-07-30 5:41 ` Ben Hutchings
0 siblings, 0 replies; 16+ messages in thread
From: Ben Hutchings @ 2018-07-30 5:41 UTC (permalink / raw)
To: Albert ARIBAUD (3ADEV), libc-alpha
On Mon, 2018-07-30 at 13:38 +0800, Ben Hutchings wrote:
> On Thu, 2018-06-14 at 15:51 +0200, Albert ARIBAUD (3ADEV) wrote:
> > * Add macro __TIMESIZE equal to the bit size of time_t.
> > Â It equals the architecture __WORDSIZE except for x32
> > Â where it equals 64.
> >
> > * Add type __time64_t which is always 64-bit. On 64-bit
> > Â architectures and on x32, it is #defined as time_t.
> > Â On other architectures, it has its own type.
>
> [...]
> > --- /dev/null
> > +++ b/sysdeps/unix/sysv/linux/x86/bits/timesizes.h
>
> [...]
> > +/* Both x86-64 and x32 use 64-bit time.  */
> > +#define __TIME64_T_TYPE __TIME_T_TYPE
>
> [...]
>
> But won't this file be used for regular 32-bit x86 (i386/i686) as well?
Never mind, I see this got fixed in v5.
Ben.
--
Ben Hutchings, Software Developer  Codethink Ltd
https://www.codethink.co.uk/ Dale House, 35 Dale Street
Manchester, M1 2HF, United Kingdom
^ permalink raw reply [flat|nested] 16+ messages in thread
end of thread, other threads:[~2018-07-30 5:41 UTC | newest]
Thread overview: 16+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-06-14 13:51 [PATCH v2 0/2] Y2038 support batch 1 - __time64_t and __tz_convert Albert ARIBAUD (3ADEV)
2018-06-14 13:51 ` [PATCH v2 2/2] Y2038: make __tz_convert compatible with 64-bit-time Albert ARIBAUD (3ADEV)
2018-06-14 17:07 ` Paul Eggert
2018-06-14 17:52 ` Albert ARIBAUD
2018-06-14 18:52 ` Paul Eggert
2018-06-14 19:40 ` Joseph Myers
2018-06-16 14:03 ` Albert ARIBAUD
2018-06-16 14:23 ` Paul Eggert
2018-06-16 18:21 ` Albert ARIBAUD
2018-06-14 13:51 ` [PATCH v2 1/2] Y2038: Add 64-bit time for all architectures Albert ARIBAUD (3ADEV)
2018-06-14 13:57 ` Joseph Myers
2018-06-14 18:51 ` Albert ARIBAUD
2018-06-14 16:56 ` Paul Eggert
2018-06-14 17:52 ` Albert ARIBAUD
2018-07-30 5:38 ` Ben Hutchings
2018-07-30 5:41 ` Ben Hutchings
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