[glibc] y2038: linux: Provide __futimens64 implementation

[Lukasz Majewski <lukma at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=42893aa38fd6041d349ea0427c4d5ccbacd9a2be

commit 42893aa38fd6041d349ea0427c4d5ccbacd9a2be
Author: Lukasz Majewski <lukma@denx.de>
Date:   Thu Oct 24 14:34:46 2019 +0200

    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.

Diff:
---
 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 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.
diff --git a/sysdeps/unix/sysv/linux/futimens.c b/sysdeps/unix/sysv/linux/futimens.c
index 1f233d1..15fc43b 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.  */
 int
-futimens (int fd, const struct timespec tsp[2])
+__futimens64 (int fd, const struct __timespec64 tsp64[2])
 {
   if (fd < 0)
     return INLINE_SYSCALL_ERROR_RETURN_VALUE (EBADF);
-  /* 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
+int
+__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);
 }
+#endif
+weak_alias (__futimens, futimens)