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[PATCH v2 2/2] 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

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
 include/time.h                     |  7 +++++++
 sysdeps/unix/sysv/linux/futimens.c | 22 +++++++++++++++++++---
 2 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/include/time.h b/include/time.h
index 432489ae29..0ec6528d78 100644
--- a/include/time.h
+++ b/include/time.h
@@ -153,6 +153,13 @@ 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
+extern int __futimens64 (int fd, const struct __timespec64 tsp[2]);
+libc_hidden_proto (__futimens64);
 /* 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.
diff --git a/sysdeps/unix/sysv/linux/futimens.c b/sysdeps/unix/sysv/linux/futimens.c
index 1f233d1246..15fc43b69c 100644
--- a/sysdeps/unix/sysv/linux/futimens.c
+++ b/sysdeps/unix/sysv/linux/futimens.c
@@ -29,10 +29,26 @@
    Starting with 2.6.22 the Linux kernel has the utimensat syscall which
    can be used to implement futimens.  */
-futimens (int fd, const struct timespec tsp[2])
+__futimens64 (int fd, const struct __timespec64 tsp64[2])
   if (fd < 0)
-  /* Avoid implicit array coercion in syscall macros.  */
-  return INLINE_SYSCALL (utimensat, 4, fd, NULL, &tsp[0], 0);
+  return __utimensat64_helper (fd, NULL, &tsp64[0], 0);
+#if __TIMESIZE != 64
+__futimens (int fd, const struct timespec tsp[2])
+  struct __timespec64 tsp64[2];
+  if (tsp)
+    {
+      tsp64[0] = valid_timespec_to_timespec64 (tsp[0]);
+      tsp64[1] = valid_timespec_to_timespec64 (tsp[1]);
+    }
+  return __futimens64 (fd, tsp ? &tsp64[0] : NULL);
+weak_alias (__futimens, futimens)

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