y2038: linux: Provide __futimens64 implementation

This patch provides new __futimens64 explicit 64 bit function for
setting access and modification time of file (by using its file descriptor).
Moreover, a 32 bit version - __futimens has been refactored to internally use
__futimens64.

The __futimens is now supposed to be used on systems still supporting
32 bit time (__TIMESIZE != 64) - hence the necessary conversions to 64 bit
struct __timespec64.
When pointer to struct __timespec64 is NULL - the file access and modification
time is set to the current one (by the kernel) and no conversions from struct
timespec to __timespec64 are performed.

The __futimens64 reuses __utimensat64_helper defined for __utimensat64.

The test procedure for __futimens64 is the same as for __utimensat64 conversion
patch.

1 files changed, 7 insertions, 0 deletions

diff --git a/include/time.h b/include/time.h
index 7debf9f..8ac58e8 100644
--- a/include/time.h
+++ b/include/time.h
@@ -158,6 +158,13 @@ extern int __utimensat64_helper (int fd, const char *file,
                                  const struct __timespec64 tsp[2], int flags);
 libc_hidden_proto (__utimensat64_helper);
 
+#if __TIMESIZE == 64
+# define __futimens64 __futimens
+#else
+extern int __futimens64 (int fd, const struct __timespec64 tsp[2]);
+libc_hidden_proto (__futimens64);
+#endif
+
 /* Compute the `struct tm' representation of T,
    offset OFFSET seconds east of UTC,
    and store year, yday, mon, mday, wday, hour, min, sec into *TP.