From: Alistair Francis <alistair.francis@wdc.com>
To: libc-alpha@sourceware.org
Cc: arnd@arndb.de, adhemerval.zanella@linaro.org, fweimer@redhat.com,
palmer@sifive.com, macro@wdc.com, zongbox@gmail.com,
zong@andestech.com, alistair.francis@wdc.com,
alistair23@gmail.com
Subject: [RFC v2 01/20] y2038: Introduce internal for glibc struct __timespec64
Date: Mon, 24 Jun 2019 17:08:46 -0700 [thread overview]
Message-ID: <d4080614ddce77c096d852560245409d28665819.1561421042.git.alistair.francis@wdc.com> (raw)
In-Reply-To: <cover.1561421042.git.alistair.francis@wdc.com>
From: Lukasz Majewski <lukma@denx.de>
This type is a glibc's type similar to struct timespec but whose tv_sec
field is a __time64_t rather than a time_t, which makes it Y2038-proof and
usable to pass syscalls between user code and Y2038-proof kernel.
To support passing this structure to the kernel - the tv_pad, 32 bit int,
has been introduced. The placement of it depends on endianness of the SoC.
Tested on x86_64 and ARM.
* include/time.h: Add struct __timespec64 definition
---
include/time.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/include/time.h b/include/time.h
index ac3163c2a5..33d0fcb0fe 100644
--- a/include/time.h
+++ b/include/time.h
@@ -5,6 +5,7 @@
# include <bits/types/locale_t.h>
# include <stdbool.h>
# include <time/mktime-internal.h>
+# include <endian.h>
extern __typeof (strftime_l) __strftime_l;
libc_hidden_proto (__strftime_l)
@@ -51,6 +52,30 @@ 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 __WORDSIZE == 64 \
+ || (defined __SYSCALL_WORDSIZE && __SYSCALL_WORDSIZE == 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 int.
+
+ 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 tv_pad; /* Padding */
+ __int32_t tv_nsec; /* Nanoseconds */
+# else
+ __int32_t tv_nsec; /* Nanoseconds */
+ __int32_t tv_pad; /* Padding */
+# endif
+};
+#endif
+
#if __TIMESIZE == 64
# define __ctime64 ctime
#else
--
2.22.0
next prev parent reply other threads:[~2019-06-25 0:11 UTC|newest]
Thread overview: 107+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-25 0:08 [RFC v2 00/20] RISC-V glibc port for the 32-bit Alistair Francis
2019-06-25 0:08 ` Alistair Francis [this message]
2019-06-25 0:08 ` [RFC v2 02/20] y2038: Provide conversion helpers for struct __timespec64 Alistair Francis
2019-06-25 0:08 ` [RFC v2 03/20] y2038: linux: Provide __clock_settime64 implementation Alistair Francis
2019-06-25 11:05 ` Arnd Bergmann
2019-06-25 15:51 ` Lukasz Majewski
2019-06-25 16:39 ` Arnd Bergmann
2019-06-26 9:07 ` Lukasz Majewski
2019-06-26 12:36 ` Arnd Bergmann
2019-06-26 15:03 ` Lukasz Majewski
2019-06-26 15:11 ` Florian Weimer
2019-06-26 22:49 ` Lukasz Majewski
2019-06-27 7:14 ` Florian Weimer
2019-06-27 7:36 ` Lukasz Majewski
2019-06-26 18:58 ` Arnd Bergmann
2019-06-26 22:55 ` Lukasz Majewski
2019-06-27 7:45 ` Arnd Bergmann
2019-06-27 10:35 ` Lukasz Majewski
2019-06-27 13:32 ` Arnd Bergmann
2019-06-27 14:07 ` Lukasz Majewski
2019-06-27 14:57 ` Arnd Bergmann
2019-06-27 15:23 ` Lukasz Majewski
2019-06-27 15:45 ` Arnd Bergmann
2019-06-27 16:16 ` Lukasz Majewski
2019-06-27 21:25 ` Arnd Bergmann
2019-06-27 22:08 ` Lukasz Majewski
2019-07-04 0:04 ` Alistair Francis
2019-07-04 8:13 ` Lukasz Majewski
2019-07-08 9:32 ` Lukasz Majewski
2019-06-27 20:08 ` Alistair Francis
2019-06-27 21:02 ` Lukasz Majewski
2019-07-08 10:49 ` Joseph Myers
2019-06-25 0:08 ` [RFC v2 04/20] include/time.h: Fix conflicting timespec types on 32-bit Alistair Francis
2019-06-25 11:17 ` Arnd Bergmann
2019-06-25 22:20 ` Alistair Francis
2019-06-25 0:08 ` [RFC v2 05/20] sysdeps/nanosleep: Use clock_nanosleep_time64 if avaliable Alistair Francis
2019-06-25 8:24 ` Andreas Schwab
2019-06-25 8:59 ` Arnd Bergmann
2019-06-26 18:20 ` Alistair Francis
2019-06-25 0:09 ` [RFC v2 06/20] sysdeps/futex: Use futex_time64 " Alistair Francis
2019-06-25 11:14 ` Florian Weimer
2019-06-25 11:26 ` Andreas Schwab
2019-06-25 11:41 ` Arnd Bergmann
2019-06-25 12:06 ` Florian Weimer
2019-06-25 13:32 ` Arnd Bergmann
2019-06-25 0:09 ` [RFC v2 07/20] sysdeps/gettimeofday: Use clock_gettime64 " Alistair Francis
2019-06-27 13:14 ` Adhemerval Zanella
2019-07-03 23:49 ` Alistair Francis
2019-07-24 20:22 ` Joseph Myers
2019-07-24 23:00 ` Alistair Francis
2019-07-25 12:57 ` Arnd Bergmann
2019-07-25 17:03 ` Paul Eggert
2019-07-25 17:21 ` Zack Weinberg
2019-07-25 18:53 ` Arnd Bergmann
2019-07-26 13:01 ` Florian Weimer
2019-07-26 13:08 ` Zack Weinberg
2019-07-25 21:23 ` Joseph Myers
2019-06-25 0:09 ` [RFC v2 08/20] sysdeps/wait: Use waitid " Alistair Francis
2019-06-25 8:16 ` Andreas Schwab
2019-06-25 10:55 ` Zack Weinberg
2019-06-25 11:06 ` Florian Weimer
2019-06-25 12:00 ` Arnd Bergmann
2019-06-25 12:10 ` Florian Weimer
2019-06-25 13:29 ` Arnd Bergmann
2019-06-25 13:39 ` Arnd Bergmann
2019-06-25 13:47 ` Florian Weimer
2019-06-25 14:04 ` Arnd Bergmann
2019-06-25 14:08 ` Florian Weimer
2019-06-25 14:21 ` Arnd Bergmann
2019-06-25 14:29 ` Florian Weimer
2019-06-26 14:37 ` Arnd Bergmann
2019-06-26 15:48 ` Florian Weimer
2019-06-26 16:28 ` Andreas Schwab
2019-07-08 12:09 ` Florian Weimer
2019-07-08 12:34 ` Andreas Schwab
2019-07-08 12:36 ` Florian Weimer
2019-07-09 22:57 ` Alistair Francis
2019-07-10 7:33 ` Andreas Schwab
2019-07-10 17:47 ` Alistair Francis
2019-07-25 15:49 ` Joseph Myers
2019-06-26 21:08 ` Arnd Bergmann
2019-06-27 7:33 ` Florian Weimer
2019-06-27 8:25 ` Andreas Schwab
2019-06-27 10:21 ` Arnd Bergmann
2019-06-27 11:12 ` Florian Weimer
2019-06-27 15:24 ` Arnd Bergmann
2019-07-03 23:50 ` Alistair Francis
2019-06-25 23:51 ` Alistair Francis
2019-06-25 0:09 ` [RFC v2 09/20] sysdeps/getrlimit: Use prlimit64 " Alistair Francis
2019-06-25 11:11 ` Florian Weimer
2019-06-25 20:45 ` Alistair Francis
2019-06-25 21:10 ` Florian Weimer
2019-06-25 23:38 ` Alistair Francis
2019-06-25 0:09 ` [RFC v2 10/20] Documentation for the RISC-V 32-bit port Alistair Francis
2019-06-25 0:09 ` [RFC v2 11/20] RISC-V: Use 64-bit time_t and off_t for RV32 and RV64 Alistair Francis
2019-06-25 0:09 ` [RFC v2 12/20] RISC-V: Support dynamic loader for the 32-bit Alistair Francis
2019-06-25 0:09 ` [RFC v2 13/20] RISC-V: Add path of library directories " Alistair Francis
2019-06-25 0:09 ` [RFC v2 14/20] RISC-V: The ABI implementation " Alistair Francis
2019-06-25 0:09 ` [RFC v2 15/20] RISC-V: Hard float support for the 32 bit Alistair Francis
2019-06-25 0:09 ` [RFC v2 16/20] RISC-V: Regenerate ULPs of RISC-V Alistair Francis
2019-06-25 0:09 ` [RFC v2 17/20] RISC-V: Add ABI lists Alistair Francis
2019-06-25 0:09 ` [RFC v2 18/20] RISC-V: Build Infastructure for the 32-bit Alistair Francis
2019-06-25 0:09 ` [RFC v2 19/20] RISC-V: Fix llrint and llround missing exceptions on RV32 Alistair Francis
2019-06-25 0:09 ` [RFC v2 20/20] Add RISC-V 32-bit target to build-many-glibcs.py Alistair Francis
2019-06-25 11:15 ` [RFC v2 00/20] RISC-V glibc port for the 32-bit Florian Weimer
2019-06-25 12:07 ` Arnd Bergmann
2019-07-04 8:47 ` Jim Wilson
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