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Add MAP_ANONYMOUS.

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Many operating systems also provide MAP_ANONYMOUS. It's not hard to
support this ourselves, we'd better add it to make it more likely for
applications to work out of the box.

Reviewed by:	alc (mman.h)
This commit is contained in:
Ed Schouten 2009-11-06 07:17:31 +00:00
parent 9da005c692
commit 54a1c2b5aa
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=198973
2 changed files with 8 additions and 1 deletions
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6
lib/libc/sys/mmap.2
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@ -28,7 +28,7 @@
.\" @(#)mmap.2 8.4 (Berkeley) 5/11/95 .\" @(#)mmap.2 8.4 (Berkeley) 5/11/95
.\" $FreeBSD$ .\" $FreeBSD$
.\" .\"
.Dd July 26, 2009 .Dd November 6, 2009
.Dt MMAP 2 .Dt MMAP 2
.Os .Os
.Sh NAME .Sh NAME
@ -108,6 +108,10 @@ The
argument is ignored. argument is ignored.
.\".It Dv MAP_FILE .\".It Dv MAP_FILE
.\"Mapped from a regular file or character-special device memory. .\"Mapped from a regular file or character-special device memory.
.It Dv MAP_ANONYMOUS
This flag is identical to
.Dv MAP_ANON
and is provided for compatibility.
.It Dv MAP_FIXED .It Dv MAP_FIXED
Do not permit the system to select a different address than the one Do not permit the system to select a different address than the one
specified. specified.

3
sys/sys/mman.h
View File

@ -82,6 +82,9 @@
*/ */
#define MAP_FILE 0x0000 /* map from file (default) */ #define MAP_FILE 0x0000 /* map from file (default) */
#define MAP_ANON 0x1000 /* allocated from memory, swap space */ #define MAP_ANON 0x1000 /* allocated from memory, swap space */
#ifndef _KERNEL
#define MAP_ANONYMOUS MAP_ANON /* For compatibility. */
#endif /* !_KERNEL */
/* /*
* Extended flags * Extended flags