Definitions of POLLWRNORM, POLLWRBAND and POLLREMOVE in xtensa linux
kernel are non-standard. Provide bits/poll.h with correct values for
these constants.

This fixes the following strace build errors:

  In file included from xlat/pollflags.h:4:0,
                   from poll.c:34:
  ./static_assert.h:40:24: error: static assertion failed: "POLLWRBAND != 
0x0100"
   # define static_assert _Static_assert
                          ^
  xlat/pollflags.h:75:1: note: in expansion of macro ‘static_assert’
   static_assert((POLLWRBAND) == (0x0100), "POLLWRBAND != 0x0100");
   ^~~~~~~~~~~~~
  ./static_assert.h:40:24: error: static assertion failed: "POLLREMOVE != 
0x0800"
   # define static_assert _Static_assert
                          ^
  xlat/pollflags.h:117:1: note: in expansion of macro ‘static_assert’
   static_assert((POLLREMOVE) == (0x0800), "POLLREMOVE != 0x0800");
   ^~~~~~~~~~~~~

Signed-off-by: Max Filippov <jcmvb...@gmail.com>
---
 libc/sysdeps/linux/xtensa/bits/poll.h | 49 +++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 libc/sysdeps/linux/xtensa/bits/poll.h

diff --git a/libc/sysdeps/linux/xtensa/bits/poll.h 
b/libc/sysdeps/linux/xtensa/bits/poll.h
new file mode 100644
index 000000000000..4588cc326006
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/bits/poll.h
@@ -0,0 +1,49 @@
+/* Copyright (C) 1997, 2001, 2006 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/>.  */
+
+#ifndef _SYS_POLL_H
+# error "Never use <bits/poll.h> directly; include <sys/poll.h> instead."
+#endif
+
+/* Event types that can be polled for.  These bits may be set in `events'
+   to indicate the interesting event types; they will appear in `revents'
+   to indicate the status of the file descriptor.  */
+#define POLLIN         0x001           /* There is data to read.  */
+#define POLLPRI                0x002           /* There is urgent data to 
read.  */
+#define POLLOUT                0x004           /* Writing now will not block.  
*/
+
+#ifdef __USE_XOPEN
+/* These values are defined in XPG4.2.  */
+# define POLLRDNORM    0x040           /* Normal data may be read.  */
+# define POLLRDBAND    0x080           /* Priority data may be read.  */
+# define POLLWRNORM    POLLOUT         /* Writing now will not block.  */
+# define POLLWRBAND    0x100           /* Priority data may be written.  */
+#endif
+
+#ifdef __USE_GNU
+/* These are extensions for Linux.  */
+# define POLLMSG       0x400
+# define POLLREMOVE    0x800
+# define POLLRDHUP     0x2000
+#endif
+
+/* Event types always implicitly polled for.  These bits need not be set in
+   `events', but they will appear in `revents' to indicate the status of
+   the file descriptor.  */
+#define POLLERR                0x008           /* Error condition.  */
+#define POLLHUP                0x010           /* Hung up.  */
+#define POLLNVAL       0x020           /* Invalid polling request.  */
-- 
2.11.0

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