Y2038: add function __time64

These implementations use only 32-bit time kernel syscalls.

Therefore, stime() will always set errno to EOVERFLOW and return -1 for dates beyond Y2038.

5 files changed, 100 insertions, 0 deletions

diff --git a/sysdeps/posix/time64.c b/sysdeps/posix/time64.c
new file mode 100644
index 0000000000..ba6e5727d0
--- /dev/null
+++ b/sysdeps/posix/time64.c
@@ -0,0 +1,41 @@
+/* Copyright (C) 1991-2018 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 <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.  */
+
+__time64_t
+__time64 (__time64_t *t)
+{
+  struct timeval tv32;
+  __time64_t result;
+
+  if (__gettimeofday (&tv32, (struct timezone *) NULL))
+    result = (__time64_t) -1;
+  else
+    result = (__time64_t) tv32.tv_sec;
+
+  if (t != NULL)
+    *t = result;
+
+  return result;
+}
diff --git a/sysdeps/unix/sysv/linux/time64.c b/sysdeps/unix/sysv/linux/time64.c
new file mode 100644
index 0000000000..772246bfd1
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/time64.c
@@ -0,0 +1,44 @@
+/* Copyright (C) 2005-2018 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 <stddef.h>
+#include <time.h>
+
+#include <sysdep.h>
+
+/* Use 32-bit 'time' syscall until a 64-bit one exists */
+
+#ifdef __NR_time
+
+__time64_t
+__time64 (__time64_t *t)
+{
+  INTERNAL_SYSCALL_DECL (err);
+  __time64_t res;
+
+  res = INTERNAL_SYSCALL (time, err, 1, NULL);
+  /* There cannot be any error.  */
+  if (t != NULL)
+    *t = res;
+  return res;
+}
+
+#else
+
+# include <sysdeps/posix/time64.c>
+
+#endif
diff --git a/time/Makefile b/time/Makefile
index 0db1206820..172e8438f2 100644
--- a/time/Makefile
+++ b/time/Makefile
@@ -31,6 +31,7 @@ headers := time.h sys/time.h sys/timeb.h bits/time.h			\
 
 routines := offtime asctime clock ctime ctime_r difftime \
 	    gmtime localtime mktime time		 \
+	    time64					 \
 	    gettimeofday settimeofday adjtime tzset	 \
 	    tzfile getitimer setitimer			 \
 	    stime dysize timegm ftime			 \
diff --git a/time/Versions b/time/Versions
index ac92d742c3..503a4f46cc 100644
--- a/time/Versions
+++ b/time/Versions
@@ -84,5 +84,6 @@ libc {
     __sigtimedwait64;
     __futimes64;
     __lutimes64;
+    __time64;
   }
 }
diff --git a/time/time.c b/time/time.c
index 4996d26f13..9703c72464 100644
--- a/time/time.c
+++ b/time/time.c
@@ -31,3 +31,16 @@ time (time_t *timer)
 libc_hidden_def (time)
 
 stub_warning (time)
+
+/* 64-bit time version */
+
+__time64_t
+__time64 (__time64_ *timer)
+{
+  __set_errno (ENOSYS);
+
+  if (timer != NULL)
+    *timer = (__time64_t) -1;
+  return (__time64_t) -1;
+}
+libc_hidden_def (__time64)