mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-12-27 21:44:34 +01:00
242afab281
Based on kib's reply on https://lists.freebsd.org/pipermail/freebsd-hackers/2016-July/049710.html PR: 210904 Submitted by: Yuri Victorovich <yuri AT rawbw DOT com> Reviewed by: jilles Approved by: bcr (mentor) MFC after: 5 days Differential Revision: https://reviews.freebsd.org/D12004
87 lines
2.8 KiB
Groff
87 lines
2.8 KiB
Groff
.\"
|
|
.\" Copyright (c) 2008 Peter Wemm
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd August 18, 2017
|
|
.Dt KINFO_GETVMMAP 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm kinfo_getvmmap
|
|
.Nd function for getting per-process memory map information
|
|
.Sh LIBRARY
|
|
.Lb libutil
|
|
.Sh SYNOPSIS
|
|
.In sys/types.h
|
|
.In sys/user.h
|
|
.In libutil.h
|
|
.Ft struct kinfo_vmentry *
|
|
.Fn kinfo_getvmmap "pid_t pid" "int *cntp"
|
|
.Sh DESCRIPTION
|
|
This function is used for obtaining virtual memory mapping information
|
|
of a particular process.
|
|
.Pp
|
|
The
|
|
.Ar pid
|
|
field contains the process identifier.
|
|
This should be the a process that you have privilege to access.
|
|
The
|
|
.Ar cntp
|
|
field is allows the caller to know how many records are returned.
|
|
.Pp
|
|
This function is a wrapper around
|
|
.Xr sysctl 3
|
|
with the
|
|
.Dv KERN_PROC_VMMAP
|
|
mib.
|
|
While the kernel returns a packed structure, this function expands the
|
|
data into a fixed record format.
|
|
.Sh CAVEAT
|
|
.Fn kinfo_getvmmap
|
|
calls can cause significant CPU consumption because calculating the residency
|
|
counts requires iterating over all memory pages of the process.
|
|
Setting the sysctl variable
|
|
.Va kern.proc_vmmap_skip_resident_count
|
|
to 1 prevents this calculation.
|
|
.Sh RETURN VALUES
|
|
On success the
|
|
.Fn kinfo_getvmmap
|
|
function returns a pointer to an array of
|
|
.Vt struct kinfo_vmentry
|
|
structures as defined by
|
|
.In sys/user.h .
|
|
The array was obtained by an internal call to
|
|
.Xr malloc 3
|
|
and must be freed by the caller with a call to
|
|
.Xr free 3 .
|
|
On failure the
|
|
.Fn kinfo_getvmmap
|
|
function returns
|
|
.Dv NULL .
|
|
.Sh SEE ALSO
|
|
.Xr free 3 ,
|
|
.Xr kinfo_getfile 3 ,
|
|
.Xr malloc 3
|