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linux/generic/bits/mmap.h [was Re: asm-generic/unistd.h and glibcuse of NR_ipc


On Tue, Sep 28, 2010 at 09:05:13AM -0400, Chris Metcalf wrote:
>  (Adding libc-ports to the cc list.)
> 
> On 9/28/2010 4:40 AM, Arnd Bergmann wrote:
> > Chris Metcalf is using the generic unistd.h file on the tile architecture
> > and has a glibc port that should be easily portable to all future
> > architectures. There are a few of them getting ready to be merged
> > now (c6x, lm32, nios2, and some people have contacted me privately
> > for architectures I cannot name).
> >
> > I expect that all of them will just use the same syscall ABI and glibc
> > port.
> 
> I'm happy to provide some previews of the work I'm doing to interested parties.
> 

I've been using this for quite a while & am very happy with it.  
Works like a charm.  I'd like to add a file to the collection: 
a linux-generic bits/mman.h.  It should complement the linux
kernel asm-generic mman files precisely.  

I spotted one thing that looks questionable: the asm-generic/mman-common.h
file has

#define MAP_TYPE 0xf     /* Mask for type of mapping.  */

but on examination, this seems to me like it should be 0x3f 
(at least) or maybe 0xff, so that, as a mask, it includes MAP_ANON.
I dunno. I just harmonized with the kernel files.

Consider the below as a formal submssion for glibc; FSF has my
copyright assignments on file.

Changelog:

2010-08-16  Linas Vepstas  <linasvepstas@gmail.com>

	* sysdeps/unix/sysv/linux/generic/bits/mman.h: New file.

---
 sysdeps/unix/sysv/linux/generic/bits/mman.h |  114 ++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)

Index: glibc-2.13/sysdeps/unix/sysv/linux/generic/bits/mman.h
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ glibc-2.13/sysdeps/unix/sysv/linux/generic/bits/mman.h	2011-04-13 12:46:55.000000000 -0500
@@ -0,0 +1,114 @@
+/* Definitions for Linux/POSIX memory map interface.
+   Copyright (C) 1997,2000,2003,2005,2006,2008,2009,2010,2011
+   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.  */
+
+#ifndef _SYS_MMAN_H
+# error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
+#endif
+
+/* These are the bits used by generic Linux syscall interfaces.
+   The following definitions are essentially identical to those
+   in asm-generic/mman.h and asm-generic/mman-common.h.  We can't
+   include those headers directly, because they are not namespace-clean.
+   That is, they don't have __USE_GNU, __USE_BSD, etc. set up. */
+
+/* Protections are chosen from these bits, OR'd together.  The
+   implementation does not necessarily support PROT_EXEC or PROT_WRITE
+   without PROT_READ.  The only guarantees are that no writing will be
+   allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
+
+#define PROT_READ	0x1		/* Page can be read.  */
+#define PROT_WRITE	0x2		/* Page can be written.  */
+#define PROT_EXEC	0x4		/* Page can be executed.  */
+#define PROT_SEM	0x8		/* Page may be used for atomic ops. */
+#define PROT_NONE	0x0		/* Page can not be accessed.  */
+#define PROT_GROWSDOWN	0x01000000	/* Extend change to start of
+					   growsdown vma (mprotect only).  */
+#define PROT_GROWSUP	0x02000000	/* Extend change to start of
+					   growsup vma (mprotect only).  */
+
+/* Sharing types (must choose one and only one of these).  */
+#define MAP_SHARED	0x01		/* Share changes.  */
+#define MAP_PRIVATE	0x02		/* Changes are private.  */
+
+/* Mapping type (must choose one and only one of these).  */
+#ifdef __USE_BSD
+# define MAP_FILE	0
+# define MAP_ANON	0x20		/* Don't use a file.  */
+# define MAP_TYPE	0x0f		/* Mask for type of mapping.  */
+# ifdef __USE_MISC
+#  define MAP_ANONYMOUS	MAP_ANON	/* Linux name.  */
+# endif
+#endif
+
+/* Other flags.  */
+#define MAP_FIXED	0x10		/* Interpret addr exactly.  */
+#ifdef __USE_MISC
+# define MAP_GROWSDOWN	0x00100		/* Stack-like segment.  */
+# define MAP_DENYWRITE	0x00800		/* ETXTBSY */
+# define MAP_EXECUTABLE	0x01000		/* Mark it as an executable.  */
+# define MAP_LOCKED	0x02000		/* Lock the mapping.  */
+# define MAP_NORESERVE	0x04000		/* Don't check for reservations.  */
+# define MAP_POPULATE	0x08000		/* Populate (prefault) pagetables.  */
+# define MAP_NONBLOCK	0x10000		/* Do not block on IO.  */
+# define MAP_STACK	0x20000		/* Allocation is for a stack.  */
+# define MAP_HUGETLB	0x40000		/* Create huge page mapping.  */
+#endif
+
+/* Flags to `msync'.  */
+#define MS_ASYNC	1	/* Sync memory asynchronously.  */
+#define MS_INVALIDATE	2	/* Invalidate the caches.  */
+#define MS_SYNC		4	/* Synchronous memory sync.  */
+
+/* Flags for `mlockall'.  */
+#define MCL_CURRENT	1	/* Lock all currently mapped pages.  */
+#define MCL_FUTURE	2	/* Lock all additions to address space.  */
+
+/* Flags for `mremap'.  */
+#ifdef __USE_GNU
+# define MREMAP_MAYMOVE	1	/* Mapping address may change.  */
+# define MREMAP_FIXED	2	/* Fifth argument sets new address.  */
+#endif
+
+/* Advice to `madvise'.  */
+#ifdef __USE_BSD
+# define MADV_NORMAL	   0	/* No further special treatment.  */
+# define MADV_RANDOM	   1	/* Expect random page references.  */
+# define MADV_SEQUENTIAL   2	/* Expect sequential page references.  */
+# define MADV_WILLNEED	   3	/* Will need these pages.  */
+# define MADV_DONTNEED	   4	/* Don't need these pages.  */
+# define MADV_REMOVE	   9	/* Remove these pages and resources.  */
+# define MADV_DONTFORK	   10	/* Do not inherit across fork.  */
+# define MADV_DOFORK	   11	/* Do inherit across fork.  */
+# define MADV_MERGEABLE	   12	/* KSM may merge identical pages.  */
+# define MADV_UNMERGEABLE  13	/* KSM may not merge identical pages.  */
+# define MADV_HUGEPAGE	   14	/* Worth backing with hugepages.  */
+# define MADV_NOHUGEPAGE   15	/* Not worth backing with hugepages.  */
+# define MADV_HWPOISON	   100	/* Poison a page for testing.  */
+# define MADV_SOFT_OFFLINE 101	/* Soft offline page for testing */
+#endif
+
+/* The POSIX people had to invent similar names for the same things.  */
+#ifdef __USE_XOPEN2K
+# define POSIX_MADV_NORMAL	0 /* No further special treatment.  */
+# define POSIX_MADV_RANDOM	1 /* Expect random page references.  */
+# define POSIX_MADV_SEQUENTIAL	2 /* Expect sequential page references.  */
+# define POSIX_MADV_WILLNEED	3 /* Will need these pages.  */
+# define POSIX_MADV_DONTNEED	4 /* Don't need these pages.  */
+#endif


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