[newlib-cygwin] Add <devctl.h> per POSIX 1003.26-2003

[Joel Sherrill]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=1a2741508b9072f25f3f348c407eb431ca59019b

commit 1a2741508b9072f25f3f348c407eb431ca59019b
Author: Joel Sherrill <joel@rtems.org>
Date:   Thu Dec 1 09:46:32 2016 -0600

    Add <devctl.h> per POSIX 1003.26-2003

Diff:
---
 newlib/libc/include/devctl.h       | 51 ++++++++++++++++++++++++++++++++++++++
 newlib/libc/include/sys/features.h |  3 +++
 newlib/libc/include/sys/unistd.h   |  1 +
 3 files changed, 55 insertions(+)

diff --git a/newlib/libc/include/devctl.h b/newlib/libc/include/devctl.h
new file mode 100644
index 0000000..e6d9875
--- /dev/null
+++ b/newlib/libc/include/devctl.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2016 Joel Sherrill <joel@rtems.org>.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _POSIX_DEVCTL_h_
+#define _POSIX_DEVCTL_h_
+
+/*
+ * The posix_devctl() method is defined by POSIX 1003.26-2003. Aside
+ * from the single method, it adds the following requirements:
+ *
+ *   + define _POSIX_26_VERSION to 200312L
+ *   + add _SC_POSIX_26_VERSION in <unistd.h>. Return _POSIX_26_VERSION
+ *   + application must define _POSIX_26_C_SOURCE to use posix_devctl().
+ *   + posix_devctl() is prototyped in <devctl.h>
+ */
+
+#ifdef _POSIX_26_C_SOURCE
+#include <stddef.h>
+
+int posix_devctl(
+  int            fd,
+  int            dcmd,
+  void *restrict dev_data_ptr,
+  size_t         nbyte,
+  int *restrict  dev_info_ptr
+);
+#endif
+
+#endif
diff --git a/newlib/libc/include/sys/features.h b/newlib/libc/include/sys/features.h
index 93635ba..a23158c 100644
--- a/newlib/libc/include/sys/features.h
+++ b/newlib/libc/include/sys/features.h
@@ -366,6 +366,9 @@ extern "C" {
 /* UNIX98 added some new pthread mutex attributes */
 #define _UNIX98_THREAD_MUTEX_ATTRIBUTES         1
 
+/* POSIX 1003.26-2003 defined device control method */
+#define _POSIX_26_VERSION			200312L
+
 #endif
 
 /* XMK loosely adheres to POSIX -- 1003.1 */
diff --git a/newlib/libc/include/sys/unistd.h b/newlib/libc/include/sys/unistd.h
index 143147d..84219ca 100644
--- a/newlib/libc/include/sys/unistd.h
+++ b/newlib/libc/include/sys/unistd.h
@@ -459,6 +459,7 @@ int	_EXFUN(unlinkat, (int, const char *, int));
 #define _SC_LEVEL4_CACHE_SIZE           137
 #define _SC_LEVEL4_CACHE_ASSOC          138
 #define _SC_LEVEL4_CACHE_LINESIZE       139
+#define _SC_POSIX_26_VERSION            140
 
 /*
  *  pathconf values per IEEE Std 1003.1, 2008 Edition