[glibc/azanella/y2038-preliminaries] Use clock_gettime to implement time.

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=95062ebe070a05a9afd2bfa76f13af47128dec15

commit 95062ebe070a05a9afd2bfa76f13af47128dec15
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Wed Sep 4 18:12:24 2019 +0000

    Use clock_gettime to implement time.
    
    Consolidate generic time implementation to use clock_gettime. Linux
    ports that still use either time or gettime syscall or vDSO are not
    changed.
    
    	* time/time.c (time): No longer a stub implementation.
    	Call __clock_gettime.
    
    	* sysdeps/unix/sysv/linux/powerpc/time.c: Use new generic
    	implementation.
    
    	* sysdeps/posix/time.c
    	* sysdeps/unix/sysv/linux/sparc/sparc64/time.c
    	* sysdeps/unix/sysv/linux/time.c: Remove file.

Diff:
---
 sysdeps/posix/time.c                         | 40 ---------------------------
 sysdeps/unix/sysv/linux/powerpc/time.c       |  2 +-
 sysdeps/unix/sysv/linux/sparc/sparc64/time.c |  1 -
 sysdeps/unix/sysv/linux/time.c               | 41 ----------------------------
 time/time.c                                  | 12 ++++----
 5 files changed, 6 insertions(+), 90 deletions(-)

diff --git a/sysdeps/posix/time.c b/sysdeps/posix/time.c
deleted file mode 100644
index e1b3bc8..0000000
--- a/sysdeps/posix/time.c
+++ /dev/null
@@ -1,40 +0,0 @@
-/* Copyright (C) 1991-2019 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <stddef.h>		/* For NULL.  */
-#include <time.h>
-#include <sys/time.h>
-
-
-/* Return the current time as a `time_t' and also put it in *T if T is
-   not NULL.  Time is represented as seconds from Jan 1 00:00:00 1970.  */
-time_t
-time (time_t *t)
-{
-  struct timeval tv;
-  time_t result;
-
-  if (__gettimeofday (&tv, (struct timezone *) NULL))
-    result = (time_t) -1;
-  else
-    result = (time_t) tv.tv_sec;
-
-  if (t != NULL)
-    *t = result;
-  return result;
-}
-libc_hidden_def (time)
diff --git a/sysdeps/unix/sysv/linux/powerpc/time.c b/sysdeps/unix/sysv/linux/powerpc/time.c
index cb3e8b9..cfb1644 100644
--- a/sysdeps/unix/sysv/linux/powerpc/time.c
+++ b/sysdeps/unix/sysv/linux/powerpc/time.c
@@ -79,6 +79,6 @@ libc_hidden_def (time)
 
 #else
 
-#include <sysdeps/posix/time.c>
+#include <time/time.c>
 
 #endif /* !SHARED */
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/time.c b/sysdeps/unix/sysv/linux/sparc/sparc64/time.c
deleted file mode 100644
index 509b580..0000000
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/time.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/posix/time.c>
diff --git a/sysdeps/unix/sysv/linux/time.c b/sysdeps/unix/sysv/linux/time.c
deleted file mode 100644
index 1978f6d..0000000
--- a/sysdeps/unix/sysv/linux/time.c
+++ /dev/null
@@ -1,41 +0,0 @@
-/* Copyright (C) 2005-2019 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <stddef.h>
-#include <time.h>
-
-#include <sysdep.h>
-
-#ifdef __NR_time
-
-time_t
-time (time_t *t)
-{
-  INTERNAL_SYSCALL_DECL (err);
-  time_t res = INTERNAL_SYSCALL (time, err, 1, NULL);
-  /* There cannot be any error.  */
-  if (t != NULL)
-    *t = res;
-  return res;
-}
-libc_hidden_def (time)
-
-#else
-
-# include <sysdeps/posix/time.c>
-
-#endif
diff --git a/time/time.c b/time/time.c
index 88612d6..bae0fd1 100644
--- a/time/time.c
+++ b/time/time.c
@@ -15,19 +15,17 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <errno.h>
 #include <time.h>
 
 /* Return the time now, and store it in *TIMER if not NULL.  */
 time_t
 time (time_t *timer)
 {
-  __set_errno (ENOSYS);
+  struct timespec ts;
+  __clock_gettime (CLOCK_REALTIME, &ts);
 
-  if (timer != NULL)
-    *timer = (time_t) -1;
-  return (time_t) -1;
+  if (timer)
+    *timer = ts.tv_sec;
+  return ts.tv_sec;
 }
 libc_hidden_def (time)
-
-stub_warning (time)