[v2,1/7] y2038: Introduce internal for glibc struct __timespec64
Commit Message
This type is a glibc's type similar to struct timespec
but whose tv_sec field is a __time64_t rather than a time_t,
which makes it Y2038-proof and usable to pass between user
code and Y2038-proof kernel syscalls (e.g. clock_gettime()).
To support passing this structure to the kernel - the tv_pad,
32 bit padding field has been introduced. The placement of it
depends on endiannes of the SoC.
Tested on x86_64 and ARM.
* include/time.h: Add struct __timespec64 definition
---
Changes for v2:
- None
---
include/time.h | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
@@ -3,6 +3,7 @@
#ifndef _ISOMAC
# include <bits/types/locale_t.h>
+# include <endian.h>
extern __typeof (strftime_l) __strftime_l;
libc_hidden_proto (__strftime_l)
@@ -58,6 +59,27 @@ extern time_t __mktime_internal (struct tm *__tp,
long int *__offset) attribute_hidden;
#if __TIMESIZE == 64
+# define __timespec64 timespec
+#else
+/* The glibc Y2038-proof struct __timespec64 structure for a time value.
+ To keep things Posix-ish, we keep the nanoseconds field a 32-bit
+ signed long, but since the Linux field is a 64-bit signed int, we
+ pad our tv_nsec with a 32-bit bitfield, which should always be 0. */
+
+struct __timespec64
+{
+ __time64_t tv_sec; /* Seconds */
+# if BYTE_ORDER == BIG_ENDIAN
+ int tv_pad: 32; /* Padding named for checking/setting */
+ __int32_t tv_nsec; /* Nanoseconds */
+# else
+ __int32_t tv_nsec; /* Nanoseconds */
+ int tv_pad: 32; /* Padding named for checking/setting */
+# endif
+};
+#endif
+
+#if __TIMESIZE == 64
# define __ctime64 ctime
#else
extern char *__ctime64 (const __time64_t *__timer) __THROW;