diff options
| author | Lukasz Majewski <lukma@denx.de> | 2020-04-22 10:54:01 +0200 |
|---|---|---|
| committer | Lukasz Majewski <lukma@denx.de> | 2020-05-20 01:09:09 +0200 |
| commit | 5613afe9e3dff54b10e4850804cd574e8c420e3d (patch) | |
| tree | 384d23883b7a4bf99457c0e73b78f96a1bb1ff90 | |
| parent | 10ae49d2ce4576d8bb8f01d1fc1cbdf550ad4cbd (diff) | |
| download | glibc-5613afe9e3dff54b10e4850804cd574e8c420e3d.tar.gz glibc-5613afe9e3dff54b10e4850804cd574e8c420e3d.tar.xz glibc-5613afe9e3dff54b10e4850804cd574e8c420e3d.zip | |
y2038: linux: Provide __ntp_gettime64 implementation
This patch provides new __ntp_gettime64 explicit 64 bit function for getting time parameters via NTP interface. Internally, the __clock_adjtime64 syscall is used instead of __adjtimex. This patch is necessary for having architectures with __WORDSIZE == 32 Y2038 safe. Moreover, a 32 bit version - __ntp_gettime has been refactored to internally use __ntp_gettime64. The __ntp_gettime 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_gettime64 and __ntp_gettime. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
| -rw-r--r-- | sysdeps/unix/sysv/linux/include/sys/timex.h | 4 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/ntp_gettime.c | 26 |
2 files changed, 27 insertions, 3 deletions
diff --git a/sysdeps/unix/sysv/linux/include/sys/timex.h b/sysdeps/unix/sysv/linux/include/sys/timex.h index e762e03230..ef53515803 100644 --- a/sysdeps/unix/sysv/linux/include/sys/timex.h +++ b/sysdeps/unix/sysv/linux/include/sys/timex.h @@ -33,6 +33,7 @@ libc_hidden_proto (__adjtimex) # define __clock_adjtime64 __clock_adjtime # define ___adjtimex64 ___adjtimex # define __ntptimeval64 ntptimeval +# define __ntp_gettime64 __ntp_gettime # else struct __timex64 @@ -91,6 +92,9 @@ struct __ntptimeval64 long int __glibc_reserved3; long int __glibc_reserved4; }; +extern int __ntp_gettime64 (struct __ntptimeval64 *ntv); +libc_hidden_proto (__ntp_gettime64) + # endif /* Convert a known valid struct timex into a struct __timex64. */ diff --git a/sysdeps/unix/sysv/linux/ntp_gettime.c b/sysdeps/unix/sysv/linux/ntp_gettime.c index c8d6a197dc..8ce5d13e00 100644 --- a/sysdeps/unix/sysv/linux/ntp_gettime.c +++ b/sysdeps/unix/sysv/linux/ntp_gettime.c @@ -17,6 +17,7 @@ #define ntp_gettime ntp_gettime_redirect +#include <time.h> #include <sys/timex.h> #undef ntp_gettime @@ -25,17 +26,36 @@ # define modes mode #endif +/* clock_adjtime64 with CLOCK_REALTIME does not trigger EINVAL, + ENODEV, or EOPNOTSUPP. It might still trigger EPERM. */ int -ntp_gettime (struct ntptimeval *ntv) +__ntp_gettime64 (struct __ntptimeval64 *ntv) { - struct timex tntx; + struct __timex64 tntx; int result; tntx.modes = 0; - result = __adjtimex (&tntx); + result = __clock_adjtime64 (CLOCK_REALTIME, &tntx); ntv->time = tntx.time; ntv->maxerror = tntx.maxerror; ntv->esterror = tntx.esterror; return result; } + +#if __TIMESIZE != 64 +libc_hidden_def (__ntp_gettime64) + +int +__ntp_gettime (struct ntptimeval *ntv) +{ + struct __ntptimeval64 ntv64; + int result; + + result = __ntp_gettime64 (&ntv64); + *ntv = valid_ntptimeval64_to_ntptimeval (ntv64); + + return result; +} +#endif +strong_alias (__ntp_gettime, ntp_gettime) |