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y2038: Introduce struct __timex64 - new internal glibc type

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The introduced glibc's 'internal' struct __timex64 is a copy of Linux kernel's
struct __kernel_timex (v5.6) introduced for properly handling data for
clock_adjtime64 syscall.
As the struct's __kernel_timex size is the same as for archs with
__WORDSIZE == 64, proper padding and data types conversion (i.e. long to long
long) had to be added for architectures with __WORDSIZE == 32 &&
__TIMESIZE != 64.

Moreover, it stores time in struct __timeval64 rather than struct
timeval, which makes it Y2038-proof.

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

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Lukasz Majewski 2020-04-21 19:08:33 +02:00
parent a308615f7c
commit dbf8178fdc
1 changed files with 46 additions and 0 deletions
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46
sysdeps/unix/sysv/linux/include/sys/timex.h
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@ -25,5 +25,51 @@
libc_hidden_proto (__adjtimex)
# include <struct___timeval64.h>
/* Local definition of 64 bit time supporting timex struct */
# if __TIMESIZE == 64
# define __timex64 timex
# else
struct __timex64
{
unsigned int modes; /* mode selector */
int :32; /* pad */
long long int offset; /* time offset (usec) */
long long int freq; /* frequency offset (scaled ppm) */
long long int maxerror; /* maximum error (usec) */
long long int esterror; /* estimated error (usec) */
int status; /* clock command/status */
int :32; /* pad */
long long int constant; /* pll time constant */
long long int precision; /* clock precision (usec) (read only) */
long long int tolerance; /* clock frequency tolerance (ppm) (ro) */
struct __timeval64 time; /* (read only, except for ADJ_SETOFFSET) */
long long int tick; /* (modified) usecs between clock ticks */
long long int ppsfreq; /* pps frequency (scaled ppm) (ro) */
long long int jitter; /* pps jitter (us) (ro) */
int shift; /* interval duration (s) (shift) (ro) */
int :32; /* pad */
long long int stabil; /* pps stability (scaled ppm) (ro) */
long long int jitcnt; /* jitter limit exceeded (ro) */
long long int calcnt; /* calibration intervals (ro) */
long long int errcnt; /* calibration errors (ro) */
long long int stbcnt; /* stability limit exceeded (ro) */
int tai; /* TAI offset (ro) */
int :32;
int :32;
int :32;
int :32;
int :32;
int :32;
int :32;
int :32;
int :32;
int :32;
int :32;
};
# endif
# endif /* _ISOMAC */
#endif /* sys/timex.h */