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y2038: include: Move struct __timespec64 definition to a separate file

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The struct __timespec64's definition has been moved from ./include/time.h to
./include/struct___timespec64.h.

This change would prevent from polluting other glibc namespaces (when
headers are modified to support 64 bit time on architectures with
__WORDSIZE==32).

Now it is possible to just include definition of this particular structure
when needed.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Lukasz Majewski 2020-02-12 10:42:49 +01:00
parent b9cde4e3aa
commit 390b5a4727
2 changed files with 28 additions and 23 deletions
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27
include/struct___timespec64.h Normal file
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@ -0,0 +1,27 @@
#ifndef _STRUCT_TIMESPEC64_H
#define _STRUCT_TIMESPEC64_H
#if __TIMESIZE == 64
# define __timespec64 timespec
#else
#include <endian.h>
/* 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
#endif /* _STRUCT_TIMESPEC64_H */

24
include/time.h
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@ -3,11 +3,11 @@
#ifndef _ISOMAC
# include <bits/types/struct_timeval.h>
# include <struct___timespec64.h>
# include <bits/types/locale_t.h>
# include <stdbool.h>
# include <time/mktime-internal.h>
# include <sys/time.h>
# include <endian.h>
# include <time-clockid.h>
# include <sys/time.h>
@ -61,28 +61,6 @@ 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