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.TH MMAN.H 3HEAD "Feb 5, 2008"
.SH NAME
mman.h, mman \- memory management declarations
.SH SYNOPSIS
.LP
.nf
#include <\fBsys/mman.h\fR>
.fi

.SH DESCRIPTION
.sp
.LP
The <\fBsys/mman.h\fR> header supports the following options:
.RS +4
.TP
.ie t \(bu
.el o
the Memory Mapped Files option
.RE
.RS +4
.TP
.ie t \(bu
.el o
the Shared Memory Objects option
.RE
.RS +4
.TP
.ie t \(bu
.el o
the Process Memory Locking option
.RE
.RS +4
.TP
.ie t \(bu
.el o
the Memory Protection option
.RE
.RS +4
.TP
.ie t \(bu
.el o
the Synchronized Input and Output option
.RE
.sp
.LP
For Memory Mapped Files and Shared Memory Objects options, the following
protection options are defined:
.sp
.ne 2
.na
\fB\fBPROT_READ\fR\fR
.ad
.RS 14n
Page can be read.
.RE

.sp
.ne 2
.na
\fB\fBPROT_WRITE\fR\fR
.ad
.RS 14n
Page can be written.
.RE

.sp
.ne 2
.na
\fB\fBPROT_EXEC\fR\fR
.ad
.RS 14n
Page can be executed.
.RE

.sp
.ne 2
.na
\fB\fBPROT_NONE\fR\fR
.ad
.RS 14n
Page cannot be accessed.
.RE

.sp
.LP
The following \fIflag\fR options are defined:
.sp
.ne 2
.na
\fB\fBMAP_SHARED\fR\fR
.ad
.RS 15n
Share changes.
.RE

.sp
.ne 2
.na
\fB\fBMAP_PRIVATE\fR\fR
.ad
.RS 15n
Changes are private.
.RE

.sp
.ne 2
.na
\fB\fBMAP_FIXED\fR\fR
.ad
.RS 15n
Interpret \fBaddr\fR exactly.
.RE

.sp
.LP
The flags immediately following are defined for \fBmsync()\fR. See
\fBmsync\fR(3C).
.sp
.ne 2
.na
\fB\fBMS_ASYNC\fR\fR
.ad
.RS 17n
Perform asynchronous writes.
.RE

.sp
.ne 2
.na
\fB\fBMS_SYNC\fR\fR
.ad
.RS 17n
Perform synchronous writes.
.RE

.sp
.ne 2
.na
\fB\fBMS_INVALIDATE\fR\fR
.ad
.RS 17n
Invalidate mappings.
.RE

.sp
.LP
The symbolic constants immediately following are defined for the
\fBmlockall()\fR function. See \fBmlockall\fR(3C).
.sp
.ne 2
.na
\fB\fBMCL_CURRENT\fR\fR
.ad
.RS 15n
Lock currently mapped pages.
.RE

.sp
.ne 2
.na
\fB\fBMCL_FUTURE\fR\fR
.ad
.RS 15n
Lock pages that become mapped.
.RE

.sp
.LP
The symbolic constant \fBMAP_FAILED\fR is defined to indicate a failure from
the \fBmmap()\fR function. See \fBmmap\fR(2).
.sp
.LP
The \fBmode_t\fR, \fBoff_t\fR, and \fBsize_t\fR types are be defined as
described in <\fBsys/types.h\fR>. See \fBtypes\fR(3HEAD).
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
_
Standard	See \fBstandards\fR(5).
.TE

.SH SEE ALSO
.sp
.LP
\fBmmap\fR(2), \fBmprotect\fR(2), \fBmunmap\fR(2), \fBmadvise\fR(3C),
\fBmlock\fR(3C), \fBmlockall\fR(3C), \fBmsync\fR(3C), \fBshm_open\fR(3C),
\fBshm_unlink\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5)