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y2038: Provide conversion helpers for struct __ntptimeval64

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Those functions allow easy conversion between Y2038 safe, glibc internal
struct __ntptimeval64 and struct ntptimeval.

The reserved fields (i.e. __glibc_reserved{1234}) during conversion are
zeroed as well, to provide behavior similar to one in ntp_gettimex function
(where those are cleared before the struct ntptimeval is returned).

Those functions are put in Linux specific sys/timex.h file, as putting
them into glibc's local include/time.h would cause build break on HURD as
it doesn't support struct timex related syscalls.

Build tests:
./src/scripts/build-many-glibcs.py glibcs

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Lukasz Majewski
2020-04-23 00:20:51 +02:00
parent df4289508a
commit 10ae49d2ce
1 changed files with 36 additions and 0 deletions
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36
sysdeps/unix/sysv/linux/include/sys/timex.h
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@ -152,5 +152,41 @@ valid_timex64_to_timex (const struct __timex64 tx64)
return tx;
}
/* Convert a known valid struct ntptimeval into a struct __ntptimeval64. */
static inline struct __ntptimeval64
valid_ntptimeval_to_ntptimeval64 (const struct ntptimeval ntv)
{
struct __ntptimeval64 ntv64;
ntv64.time = valid_timeval_to_timeval64 (ntv.time);
ntv64.maxerror = ntv.maxerror;
ntv64.esterror = ntv.esterror;
ntv64.tai = ntv.tai;
ntv64.__glibc_reserved1 = 0;
ntv64.__glibc_reserved2 = 0;
ntv64.__glibc_reserved3 = 0;
ntv64.__glibc_reserved4 = 0;
return ntv64;
}
/* Convert a known valid struct __ntptimeval64 into a struct ntptimeval. */
static inline struct ntptimeval
valid_ntptimeval64_to_ntptimeval (const struct __ntptimeval64 ntp64)
{
struct ntptimeval ntp;
ntp.time = valid_timeval64_to_timeval (ntp64.time);
ntp.maxerror = ntp64.maxerror;
ntp.esterror = ntp64.esterror;
ntp.tai = ntp64.tai;
ntp.__glibc_reserved1 = 0;
ntp.__glibc_reserved2 = 0;
ntp.__glibc_reserved3 = 0;
ntp.__glibc_reserved4 = 0;
return ntp;
}
# endif /* _ISOMAC */
#endif /* sys/timex.h */