237 lines
6.4 KiB
Groff
237 lines
6.4 KiB
Groff
.\" $NetBSD: kvm_getprocs.3,v 1.15 2009/03/10 23:49:07 joerg Exp $
|
|
.\"
|
|
.\" Copyright (c) 1992, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software developed by the Computer Systems
|
|
.\" Engineering group at Lawrence Berkeley Laboratory under DARPA contract
|
|
.\" BG 91-66 and contributed to Berkeley.
|
|
.\"
|
|
.\" 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.
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
|
.\"
|
|
.\" @(#)kvm_getprocs.3 8.1 (Berkeley) 6/4/93
|
|
.\"
|
|
.Dd February 10, 2004
|
|
.Dt KVM_GETPROCS 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm kvm_getprocs ,
|
|
.Nm kvm_getargv ,
|
|
.Nm kvm_getenvv
|
|
.Nd access user process state
|
|
.Sh LIBRARY
|
|
.Lb libkvm
|
|
.Sh SYNOPSIS
|
|
.In kvm.h
|
|
.In sys/param.h
|
|
.In sys/sysctl.h
|
|
.\" .Fa kvm_t *kd
|
|
.Ft struct kinfo_proc *
|
|
.Fn kvm_getprocs "kvm_t *kd" "int op" "int arg" "int *cnt"
|
|
.Ft char **
|
|
.Fn kvm_getargv "kvm_t *kd" "const struct kinfo_proc *p" "int nchr"
|
|
.Ft char **
|
|
.Fn kvm_getenvv "kvm_t *kd" "const struct kinfo_proc *p" "int nchr"
|
|
.Ft struct kinfo_proc2 *
|
|
.Fn kvm_getproc2 "kvm_t *kd" "int op" "int arg" "int elemsize" "int *cnt"
|
|
.Ft char **
|
|
.Fn kvm_getargv2 "kvm_t *kd" "const struct kinfo_proc2 *p" "int nchr"
|
|
.Ft char **
|
|
.Fn kvm_getenvv2 "kvm_t *kd" "const struct kinfo_proc2 *p" "int nchr"
|
|
.Sh DESCRIPTION
|
|
.Fn kvm_getprocs
|
|
returns a (sub-)set of active processes in the kernel indicated by
|
|
.Fa kd .
|
|
The
|
|
.Fa op
|
|
and
|
|
.Fa arg
|
|
arguments constitute a predicate
|
|
which limits the set of processes returned.
|
|
The value of
|
|
.Fa op
|
|
describes the filtering predicate as follows:
|
|
.Pp
|
|
.Bl -tag -width 20n -offset indent -compact
|
|
.It Sy KERN_PROC_ALL
|
|
all processes
|
|
.It Sy KERN_PROC_PID
|
|
processes with process id
|
|
.Fa arg
|
|
.It Sy KERN_PROC_PGRP
|
|
processes with process group
|
|
.Fa arg
|
|
.It Sy KERN_PROC_SESSION
|
|
processes with session id
|
|
.Fa arg
|
|
.It Sy KERN_PROC_TTY
|
|
processes with tty device
|
|
.Fa arg
|
|
.It Sy KERN_PROC_UID
|
|
processes with effective user id
|
|
.Fa arg
|
|
.It Sy KERN_PROC_RUID
|
|
processes with real user id
|
|
.Fa arg
|
|
.It Sy KERN_PROC_GID
|
|
processes with effective group id
|
|
.Fa arg
|
|
.It Sy KERN_PROC_RGID
|
|
processes with real group id
|
|
.Fa arg
|
|
.El
|
|
.Pp
|
|
The number of processes found is returned in the reference parameter
|
|
.Fa cnt .
|
|
The processes are returned as a contiguous array of
|
|
.Sy kinfo_proc
|
|
structures.
|
|
This memory is locally allocated, and subsequent calls to
|
|
.Fn kvm_getprocs
|
|
and
|
|
.Fn kvm_close
|
|
will overwrite this storage.
|
|
.Pp
|
|
If the
|
|
.Fa op
|
|
argument for
|
|
.Fn kvm_getprocs
|
|
is
|
|
.Sy KERN_PROC_TTY ,
|
|
.Fa arg
|
|
can also be
|
|
.Sy KERN_PROC_TTY_NODEV
|
|
to select processes with no controlling tty and
|
|
.Sy KERN_PROC_TTY_REVOKE
|
|
to select processes which have had their controlling tty
|
|
revoked.
|
|
.Pp
|
|
.Fn kvm_getargv
|
|
returns a null-terminated argument vector that corresponds to the
|
|
command line arguments passed to process indicated by
|
|
.Fa p .
|
|
Most likely, these arguments correspond to the values passed to
|
|
.Xr exec 3
|
|
on process creation.
|
|
This information is, however,
|
|
deliberately under control of the process itself.
|
|
Note that the original command name can be found, unaltered,
|
|
in the p_comm field of the process structure returned by
|
|
.Fn kvm_getprocs .
|
|
.Pp
|
|
The
|
|
.Fa nchr
|
|
argument indicates the maximum number of characters, including null bytes,
|
|
to use in building the strings.
|
|
If this amount is exceeded, the string
|
|
causing the overflow is truncated and the partial result is returned.
|
|
This is handy for programs like
|
|
.Xr ps 1
|
|
and
|
|
.Xr w 1
|
|
that print only a one line summary of a command and should not copy
|
|
out large amounts of text only to ignore it.
|
|
If
|
|
.Fa nchr
|
|
is zero, no limit is imposed and all argument strings are returned in
|
|
their entirety.
|
|
.Pp
|
|
The memory allocated to the argv pointers and string storage
|
|
is owned by the kvm library.
|
|
Subsequent
|
|
.Fn kvm_getprocs
|
|
and
|
|
.Xr kvm_close 3
|
|
calls will clobber this storage.
|
|
.Pp
|
|
The
|
|
.Fn kvm_getenvv
|
|
function is similar to
|
|
.Fn kvm_getargv
|
|
but returns the vector of environment strings.
|
|
This data is also alterable by the process.
|
|
.Pp
|
|
.Fn kvm_getproc2
|
|
is similar to
|
|
.Fn kvm_getprocs
|
|
but returns an array of
|
|
.Sy kinfo_proc2
|
|
structures.
|
|
Additionally, only the first
|
|
.Fa elemsize
|
|
bytes of each array entry are returned.
|
|
If the size of the
|
|
.Sy kinfo_proc2
|
|
structure increases in size in a future release of
|
|
.Nx
|
|
the kernel will only return the requested amount of data for
|
|
each array entry and programs that use
|
|
.Fn kvm_getproc2
|
|
will continue to function without the need for recompilation.
|
|
.Pp
|
|
The
|
|
.Fn kvm_getargv2
|
|
and
|
|
.Fn kvm_getenvv2
|
|
are equivalents to the
|
|
.Fn kvm_getargv
|
|
and
|
|
.Fn kvm_getenvv
|
|
functions but use a
|
|
.Sy kinfo_proc2
|
|
structure to specify the process.
|
|
.Pp
|
|
If called against an active kernel, the
|
|
.Fn kvm_getproc2 ,
|
|
.Fn kvm_getargv2 ,
|
|
and
|
|
.Fn kvm_getenvv2
|
|
functions will use the
|
|
.Xr sysctl 3
|
|
interface and do not require access to the kernel memory device
|
|
file or swap device.
|
|
.Sh RETURN VALUES
|
|
.Fn kvm_getprocs ,
|
|
.Fn kvm_getargv ,
|
|
.Fn kvm_getenvv ,
|
|
.Fn kvm_getproc2 ,
|
|
.Fn kvm_getargv2 ,
|
|
and
|
|
.Fn kvm_getenvv2
|
|
all return
|
|
.Dv NULL
|
|
on failure.
|
|
.Sh SEE ALSO
|
|
.Xr kvm 3 ,
|
|
.Xr kvm_close 3 ,
|
|
.Xr kvm_geterr 3 ,
|
|
.Xr kvm_nlist 3 ,
|
|
.Xr kvm_open 3 ,
|
|
.Xr kvm_openfiles 3 ,
|
|
.Xr kvm_read 3 ,
|
|
.Xr kvm_write 3
|
|
.Sh BUGS
|
|
These routines do not belong in the kvm interface.
|