[glibc] linux: Add time64 support for nanosleep

[glibc] linux: Add time64 support for nanosleep

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c3a020eedde907e7df69159a54bf59d39db85709

commit c3a020eedde907e7df69159a54bf59d39db85709
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Sun Jul 12 14:55:30 2020 -0300

    linux: Add time64 support for nanosleep
    
    It uses __clock_nanosleep64 and adds the __nanosleep64 symbol.
    
    Checked on x86_64-linux-gnu and i686-linux-gnu (on 5.4 and on 4.15
    kernel).
    
    Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Diff:
---
 include/time.h                      |  9 +++++++
 sysdeps/unix/sysv/linux/nanosleep.c | 50 +++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+)

diff --git a/include/time.h b/include/time.h
index 936486e206..edf6cdf829 100644
--- a/include/time.h
+++ b/include/time.h
@@ -271,6 +271,15 @@ extern struct tm *__tz_convert (__time64_t timer, int use_localtime,
 extern int __nanosleep (const struct timespec *__requested_time,
 			struct timespec *__remaining);
 hidden_proto (__nanosleep)
+#if __TIMESIZE == 64
+# define __nanosleep64 __nanosleep
+#else
+extern int __nanosleep64 (const struct __timespec64 *__requested_time,
+			  struct __timespec64 *__remaining);
+hidden_proto (__nanosleep64)
+#endif
+
+
 extern int __getdate_r (const char *__string, struct tm *__resbufp)
   attribute_hidden;
 
diff --git a/sysdeps/unix/sysv/linux/nanosleep.c b/sysdeps/unix/sysv/linux/nanosleep.c
new file mode 100644
index 0000000000..8f4ee0f744
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nanosleep.c
@@ -0,0 +1,50 @@
+/* High-resolution sleep.
+   Copyright (C) 2020 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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <time.h>
+#include <errno.h>
+
+int
+__nanosleep64 (const struct __timespec64 *req, struct __timespec64 *rem)
+{
+  int ret = __clock_nanosleep_time64 (CLOCK_REALTIME, 0, req, rem);
+  if (ret != 0)
+    {
+      __set_errno (ret);
+      return -1;
+    }
+  return 0;
+}
+#if __TIMESIZE != 64
+libc_hidden_def (__nanosleep64)
+
+int
+__nanosleep (const struct timespec *req, struct timespec *rem)
+{
+  struct __timespec64 treq64, trem64;
+
+  treq64 = valid_timespec_to_timespec64 (*req);
+  int ret = __nanosleep64 (&treq64, &trem64);
+
+  if (ret != 0 && errno == EINTR && rem != NULL)
+    *rem = valid_timespec64_to_timespec (trem64);
+  return ret;
+}
+#endif
+libc_hidden_def (__nanosleep)
+weak_alias (__nanosleep, nanosleep)