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y2038: linux: Provide __ntp_gettimex64 implementation

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This patch provides new __ntp_gettimex64 explicit 64 bit function for getting
time parameters via NTP interface.

The call to __adjtimex in __ntp_gettime64 function has been replaced with
direct call to __clock_adjtime64 syscall, to simplify the code.

Moreover, a 32 bit version - __ntp_gettimex has been refactored to internally
use __ntp_gettimex64.

The __ntp_gettimex is now supposed to be used on systems still supporting 32
bit time (__TIMESIZE != 64) - hence the necessary conversions between struct
ntptimeval and 64 bit struct __ntptimeval64.

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

Run-time tests:
- Run specific tests on ARM/x86 32bit systems (qemu):
  https://github.com/lmajewski/meta-y2038 and run tests:
  https://github.com/lmajewski/y2038-tests/commits/master

Above tests were performed with Y2038 redirection applied as well as without to
test the proper usage of both __ntp_gettimex64 and __ntp_gettimex.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Lukasz Majewski
2020-04-22 10:49:39 +02:00
parent 5613afe9e3
commit 4c4fc04826
2 changed files with 26 additions and 3 deletions
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3
sysdeps/unix/sysv/linux/include/sys/timex.h
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@ -34,6 +34,7 @@ libc_hidden_proto (__adjtimex)
# define ___adjtimex64 ___adjtimex
# define __ntptimeval64 ntptimeval
# define __ntp_gettime64 __ntp_gettime
# define __ntp_gettimex64 __ntp_gettimex
# else
struct __timex64
@ -94,6 +95,8 @@ struct __ntptimeval64
};
extern int __ntp_gettime64 (struct __ntptimeval64 *ntv);
libc_hidden_proto (__ntp_gettime64)
extern int __ntp_gettimex64 (struct __ntptimeval64 *ntv);
libc_hidden_proto (__ntp_gettimex64)
# endif