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timer_gettime: add time64 syscall support, decouple 32-bit time_t 

the time64 syscall has to be used if time_t is 64-bit, since there's
no way of knowing before making a syscall whether the result will fit
in 32 bits, and the 32-bit syscalls do not report overflow as an
error.

on 64-bit archs, there is no change to the code after preprocessing.
on current 32-bit archs, the result is now read from the kernel
through long[4] array, then copied into the timespec, to remove the
assumption that time_t is the same as long.
This commit is contained in:
Rich Felker 2019-07-28 22:46:19 -04:00
parent 4c307bed03
commit a02bd52864
1 changed files with 16 additions and 0 deletions
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16
src/time/timer_gettime.c
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@ -8,5 +8,21 @@ int timer_gettime(timer_t t, struct itimerspec *val)
pthread_t td = (void *)((uintptr_t)t << 1);
t = (void *)(uintptr_t)(td->timer_id & INT_MAX);
}
#ifdef SYS_timer_gettime64
int r = -ENOSYS;
if (sizeof(time_t) > 4)
r = __syscall(SYS_timer_gettime64, t, val);
if (SYS_timer_gettime == SYS_timer_gettime64 || r!=-ENOSYS)
return __syscall_ret(r);
long val32[4];
r = __syscall(SYS_timer_gettime, t, val32);
if (!r) {
val->it_interval.tv_sec = val32[0];
val->it_interval.tv_nsec = val32[1];
val->it_value.tv_sec = val32[2];
val->it_value.tv_nsec = val32[3];
}
return __syscall_ret(r);
#endif
return syscall(SYS_timer_gettime, t, val);
}