summaryrefslogtreecommitdiff
path: root/libc/sysdeps/linux/common/bits/mman.h
diff options
context:
space:
mode:
Diffstat (limited to 'libc/sysdeps/linux/common/bits/mman.h')
-rw-r--r--libc/sysdeps/linux/common/bits/mman.h87
1 files changed, 87 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/common/bits/mman.h b/libc/sysdeps/linux/common/bits/mman.h
new file mode 100644
index 000000000..f567b9baa
--- /dev/null
+++ b/libc/sysdeps/linux/common/bits/mman.h
@@ -0,0 +1,87 @@
+/* Definitions for BSD-style memory management.
+ Copyright (C) 1994-1998,2000,01 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. */
+
+/* These are the bits used by 4.4 BSD and its derivatives. On systems
+ (such as GNU) where these facilities are not system services but can be
+ emulated in the C library, these are the definitions we emulate. */
+
+#ifndef _SYS_MMAN_H
+# error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
+#endif
+
+/* 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_NONE 0x00 /* No access. */
+#define PROT_READ 0x04 /* Pages can be read. */
+#define PROT_WRITE 0x02 /* Pages can be written. */
+#define PROT_EXEC 0x01 /* Pages can be executed. */
+
+/* Flags contain mapping type, sharing type and options. */
+
+/* Mapping type (must choose one and only one of these). */
+#ifdef __USE_BSD
+# define MAP_FILE 0x0001 /* Mapped from a file or device. */
+# define MAP_ANON 0x0002 /* Allocated from anonymous virtual memory. */
+# define MAP_TYPE 0x000f /* Mask for type field. */
+# ifdef __USE_MISC
+# define MAP_ANONYMOUS MAP_ANON /* Linux name. */
+# endif
+#endif
+
+/* Sharing types (must choose one and only one of these). */
+#ifdef __USE_BSD
+# define MAP_COPY 0x0020 /* Virtual copy of region at mapping time. */
+#endif
+#define MAP_SHARED 0x0010 /* Share changes. */
+#define MAP_PRIVATE 0x0000 /* Changes private; copy pages on write. */
+
+/* Other flags. */
+#define MAP_FIXED 0x0100 /* Map address must be exactly as requested. */
+#ifdef __USE_BSD
+# define MAP_NOEXTEND 0x0200 /* For MAP_FILE, don't change file size. */
+# define MAP_HASSEMPHORE 0x0400 /* Region may contain semaphores. */
+# define MAP_INHERIT 0x0800 /* Region is retained after exec. */
+#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. */
+#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
+
+
+/* Flags for `mlockall' (can be OR'd together). */
+#define MCL_CURRENT 1 /* Lock all currently mapped pages. */
+#define MCL_FUTURE 2 /* Lock all additions to address
+ space. */