Introduce time64 support.

This patch introduces *time64 syscalls support for uClibc-ng.
Currently the redirection of syscalls to their *time64
analogs is fully supported for 32bit ARM (ARMv5, ARMv6, ARMv7).
The main changes that take effect when time64 feature is enabled are:
- sizeof(time_t) is 8.
- There is a possibility os setting date beyond year 2038.
- some syscalls are redirected:
clock_adjtime -> clock_adjtime64
clock_getres -> clock_getres_time64
clock_gettime -> clock_gettime64
clock_nanosleep -> clock_nanosleep_time64
clock_settime -> clock_settime64
futex -> futex_time64
mq_timedreceive -> mq_timedreceive_time64
mq_timedsend -> mq_timedsend_time64
ppoll -> ppoll_time64
pselect6 -> pselect6_time64
recvmmsg -> recvmmsg_time64
rt_sigtimedwait -> rt_sigtimedwait_time64
sched_rr_get_interval -> sched_rr_get_interval_time64
semtimedop -> semtimedop_time64
timer_gettime -> timer_gettime64
timer_settime -> timer_settime64
timerfd_gettime -> timerfd_gettime64
timerfd_settime -> timerfd_settime64
utimensat -> utimensat_time64.

- settimeofday uses clock_settime (like in glibc/musl).
- gettimeofday uses clock_gettime (like in glibc/musl).
- nanosleep uses clock_nanosleep (like in glibc/musl).

- There are some fixes in data structures used by libc and kernel
for correct data handling both with and without enabled time64 support.

Signed-off-by: Dmitry Chestnykh <dm.chestnykh@gmail.com>

1 files changed, 16 insertions, 5 deletions

diff --git a/libc/sysdeps/linux/common/settimeofday.c b/libc/sysdeps/linux/common/settimeofday.c
index 14a261794..75d18ffc2 100644
--- a/libc/sysdeps/linux/common/settimeofday.c
+++ b/libc/sysdeps/linux/common/settimeofday.c
@@ -10,9 +10,21 @@
 
 #ifdef __USE_BSD
 # include <sys/time.h>
-# ifdef __NR_settimeofday
-_syscall2(int, settimeofday, const struct timeval *, tv,
-	  const struct timezone *, tz)
+# include <time.h>
+
+int settimeofday(const struct timeval *tv, const struct timezone *tz)
+{
+	if (!tv)
+		return 0;
+
+	struct timespec __ts = {
+		.tv_sec = tv->tv_sec,
+		.tv_nsec = tv->tv_usec * 1000
+	};
+
+	return clock_settime(CLOCK_REALTIME, &__ts);
+}
+
 # elif defined __USE_SVID && defined __NR_stime
 #  define __need_NULL
 #  include <stddef.h>
@@ -36,7 +48,6 @@ int settimeofday(const struct timeval *tv, const struct timezone *tz)
 	return stime(&when);
 }
 # endif
-# if defined __NR_settimeofday || (defined __USE_SVID && defined __NR_stime)
+# if defined __NR_settimeofday || defined(__UCLIBC_USE_TIME64__) || (defined __USE_SVID && defined __NR_stime)
 libc_hidden_def(settimeofday)
 # endif
-#endif