Y2038: add function __gettimeofday64

Implementing a 64-bit settimeofday requires adding a new
file to build under time/ and we cannot name that new file
'settimeofday.c' or it will break the 32-bit settimeofday
symbol, so we call it 'settimeofday64.c'.

5 files changed, 62 insertions, 1 deletions

diff --git a/include/sys/time.h b/include/sys/time.h
index 98f6b6b2cc..ed73a445bf 100644
--- a/include/sys/time.h
+++ b/include/sys/time.h
@@ -24,6 +24,8 @@ extern int __gettimeofday (struct timeval *__tv,
 			   struct timezone *__tz);
 libc_hidden_proto (__gettimeofday)
 libc_hidden_proto (gettimeofday)
+extern int __gettimeofday64 (struct __timeval64 *__tv,
+			     struct timezone *__tz);
 extern int __settimeofday (const struct timeval *__tv,
 			   const struct timezone *__tz)
 	attribute_hidden;
diff --git a/sysdeps/unix/sysv/linux/gettimeofday64.c b/sysdeps/unix/sysv/linux/gettimeofday64.c
new file mode 100644
index 0000000000..bde2a7e973
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/gettimeofday64.c
@@ -0,0 +1,48 @@
+/* Copyright (C) 2015-2018 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 <errno.h>
+#include <sys/time.h>
+
+#undef __gettimeofday
+
+#ifdef HAVE_GETTIMEOFDAY_VSYSCALL
+# define HAVE_VSYSCALL
+#endif
+#include <sysdep-vdso.h>
+
+/* Get the current time of day and timezone information,
+   putting it into *tv and *tz.  If tz is null, *tz is not filled.
+   Returns 0 on success, -1 on errors.  */
+
+int
+__gettimeofday64 (struct __timeval64 *tv, struct timezone *tz)
+{
+  struct timeval tv32;
+  int result;
+
+  result = INLINE_VSYSCALL (gettimeofday, 2, &tv32, tz);
+
+  if (result == 0)
+    {
+      tv->tv_sec = tv32.tv_sec;
+      tv->tv_usec = tv32.tv_usec;
+    }
+
+  return result;
+}
diff --git a/time/Makefile b/time/Makefile
index 0db1206820..f71847f2b3 100644
--- a/time/Makefile
+++ b/time/Makefile
@@ -32,6 +32,7 @@ headers := time.h sys/time.h sys/timeb.h bits/time.h			\
 routines := offtime asctime clock ctime ctime_r difftime \
 	    gmtime localtime mktime time		 \
 	    gettimeofday settimeofday adjtime tzset	 \
+	    gettimeofday64				 \
 	    tzfile getitimer setitimer			 \
 	    stime dysize timegm ftime			 \
 	    getdate strptime strptime_l			 \
diff --git a/time/Versions b/time/Versions
index ac92d742c3..dff4717af9 100644
--- a/time/Versions
+++ b/time/Versions
@@ -84,5 +84,6 @@ libc {
     __sigtimedwait64;
     __futimes64;
     __lutimes64;
+    __gettimeofday64;
   }
 }
diff --git a/time/gettimeofday.c b/time/gettimeofday.c
index d1ab9acd17..e4a67c6d99 100644
--- a/time/gettimeofday.c
+++ b/time/gettimeofday.c
@@ -16,7 +16,6 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <errno.h>
-#include <sys/time.h>
 
 /* Get the current time of day and timezone information,
    putting it into *TV and *TZ.  If TZ is NULL, *TZ is not filled.
@@ -32,3 +31,13 @@ weak_alias (__gettimeofday, gettimeofday)
 libc_hidden_weak (gettimeofday)
 
 stub_warning (gettimeofday)
+
+/* 64-bit time version */
+
+int
+__gettimeofday64 (struct timeval *tv, struct timezone *tz)
+{
+  __set_errno (ENOSYS);
+  return -1;
+}
+stub_warning (__gettimeofday64)