Move kernel-features.h header from the linuxthread directory

to a common one (libc/sysdeps/linux/common/bits) so that any 
function can access to supported kernel feature (i.e. getdents).

Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>

2 files changed, 81 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/common/bits/kernel-features.h b/libc/sysdeps/linux/common/bits/kernel-features.h
new file mode 100644
index 000000000..88a71828b
--- /dev/null
+++ b/libc/sysdeps/linux/common/bits/kernel-features.h
@@ -0,0 +1,80 @@
+/* Set flags signalling availability of kernel features based on given
+   kernel version number.
+   Copyright (C) 1999-2003, 2004, 2005 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/* This file must not contain any C code.  At least it must be protected
+   to allow using the file also in assembler files.  */
+
+#if defined __mips__
+# include <sgidefs.h>
+#endif
+
+#include <linux/version.h>
+#define __LINUX_KERNEL_VERSION	LINUX_VERSION_CODE
+
+/* Real-time signal became usable in 2.1.70.  */
+#if __LINUX_KERNEL_VERSION >= 131398
+# define __ASSUME_REALTIME_SIGNALS	1
+#endif
+
+/* Beginning with 2.5.63 support for realtime and monotonic clocks and
+   timers based on them is available.  */
+#if __LINUX_KERNEL_VERSION >= 132415
+# define __ASSUME_POSIX_TIMERS		1
+#endif
+
+/* On x86, the set_thread_area syscall was introduced in 2.5.29, but its
+   semantics was changed in 2.5.30, and again after 2.5.31.  */
+#if __LINUX_KERNEL_VERSION >= 132384 && defined __i386__
+# define __ASSUME_SET_THREAD_AREA_SYSCALL	1
+#endif
+
+/* We can use the LDTs for threading with Linux 2.3.99 and newer.  */
+#if __LINUX_KERNEL_VERSION >= 131939
+# define __ASSUME_LDT_WORKS		1
+#endif
+
+/* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way
+   and the vfork syscall made it into the official kernel.  */
+#if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__
+# define __ASSUME_STD_AUXV		1
+# define __ASSUME_VFORK_SYSCALL		1
+#endif
+
+/* The vfork syscall on x86 and arm was definitely available in 2.4.  */
+#if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __arm__)
+# define __ASSUME_VFORK_SYSCALL		1
+#endif
+
+/* Starting with version 2.6.4-rc1 the getdents syscall returns d_type
+ *    information as well and in between 2.6.5 and 2.6.8 most compat wrappers
+ *       were fixed too.  Except s390{,x} which was fixed in 2.6.11.  */
+#if (__LINUX_KERNEL_VERSION >= 0x020608 && !defined __s390__) \
+    || (__LINUX_KERNEL_VERSION >= 0x02060b && defined __s390__)
+# define __ASSUME_GETDENTS32_D_TYPE 1
+#endif
+
+/* These features were surely available with 2.4.12.  */
+#if __LINUX_KERNEL_VERSION >= 132108 && defined __mc68000__
+# define __ASSUME_MMAP2_SYSCALL		1
+# define __ASSUME_TRUNCATE64_SYSCALL	1
+# define __ASSUME_STAT64_SYSCALL	1
+# define __ASSUME_FCNTL64		1
+# define __ASSUME_VFORK_SYSCALL		1
+#endif
diff --git a/libc/sysdeps/linux/common/getdents.c b/libc/sysdeps/linux/common/getdents.c
index 0baf47eb4..e1aa2a51f 100644
--- a/libc/sysdeps/linux/common/getdents.c
+++ b/libc/sysdeps/linux/common/getdents.c
@@ -16,6 +16,7 @@
 #include <sys/types.h>
 #include <sys/syscall.h>
 #include <bits/kernel_types.h>
+#include <bits/kernel-features.h>
 
 /* With newer versions of linux, the getdents syscall returns d_type
  * information after the name field.