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fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
175 lines
5.1 KiB
Groff
175 lines
5.1 KiB
Groff
.\" Copyright (c) 1992, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software developed by the Computer Systems
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.\" Engineering group at Lawrence Berkeley Laboratory under DARPA contract
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.\" BG 91-66 and contributed to Berkeley.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)kvm_getprocs.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd November 22, 2011
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.Dt KVM_GETPROCS 3
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.Os
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.Sh NAME
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.Nm kvm_getprocs ,
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.Nm kvm_getargv ,
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.Nm kvm_getenvv
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.Nd access user process state
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.Sh LIBRARY
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.Lb libkvm
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.Sh SYNOPSIS
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.In kvm.h
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.In sys/param.h
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.In sys/sysctl.h
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.In sys/user.h
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.\" .Fa kvm_t *kd
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.Ft struct kinfo_proc *
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.Fn kvm_getprocs "kvm_t *kd" "int op" "int arg" "int *cnt"
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.Ft char **
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.Fn kvm_getargv "kvm_t *kd" "const struct kinfo_proc *p" "int nchr"
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.Ft char **
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.Fn kvm_getenvv "kvm_t *kd" "const struct kinfo_proc *p" "int nchr"
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.Sh DESCRIPTION
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The
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.Fn kvm_getprocs
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function returns a (sub-)set of active processes in the kernel indicated by
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.Fa kd .
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The
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.Fa op
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and
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.Fa arg
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arguments constitute a predicate which limits the set of processes
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returned.
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The value of
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.Fa op
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describes the filtering predicate as follows:
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.Pp
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.Bl -tag -width 20n -offset indent -compact
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.It Dv KERN_PROC_ALL
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all processes and kernel visible threads
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.It Dv KERN_PROC_PROC
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all processes, without threads
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.It Dv KERN_PROC_PID
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processes with process ID
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.Fa arg
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.It Dv KERN_PROC_PGRP
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processes with process group
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.Fa arg
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.It Dv KERN_PROC_SESSION
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processes with session
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.Fa arg
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.It Dv KERN_PROC_TTY
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processes with TTY
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.Fa arg
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.It Dv KERN_PROC_UID
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processes with effective user ID
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.Fa arg
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.It Dv KERN_PROC_RUID
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processes with real user ID
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.Fa arg
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.It Dv KERN_PROC_INC_THREAD
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modifier to return all kernel visible threads when filtering
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by process ID, process group, TTY, user ID, and real user ID
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.El
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.Pp
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The number of processes found is returned in the reference parameter
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.Fa cnt .
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The processes are returned as a contiguous array of kinfo_proc structures.
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This memory is locally allocated, and subsequent calls to
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.Fn kvm_getprocs
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and
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.Fn kvm_close
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will overwrite this storage.
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.Pp
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The
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.Fn kvm_getargv
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function returns a null-terminated argument vector that corresponds to the
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command line arguments passed to process indicated by
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.Fa p .
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Most likely, these arguments correspond to the values passed to
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.Xr exec 3
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on process creation.
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This information is, however,
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deliberately under control of the process itself.
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Note that the original command name can be found, unaltered,
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in the p_comm field of the process structure returned by
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.Fn kvm_getprocs .
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.Pp
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The
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.Fa nchr
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argument indicates the maximum number of characters, including null bytes,
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to use in building the strings.
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If this amount is exceeded, the string
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causing the overflow is truncated and the partial result is returned.
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This is handy for programs like
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.Xr ps 1
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and
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.Xr w 1
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that print only a one line summary of a command and should not copy
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out large amounts of text only to ignore it.
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If
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.Fa nchr
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is zero, no limit is imposed and all argument strings are returned in
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their entirety.
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.Pp
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The memory allocated to the argv pointers and string storage
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is owned by the kvm library.
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Subsequent
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.Fn kvm_getprocs
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and
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.Xr kvm_close 3
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calls will clobber this storage.
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.Pp
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The
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.Fn kvm_getenvv
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function is similar to
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.Fn kvm_getargv
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but returns the vector of environment strings.
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This data is
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also alterable by the process.
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.Sh RETURN VALUES
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The
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.Fn kvm_getprocs ,
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.Fn kvm_getargv ,
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and
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.Fn kvm_getenvv
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functions return
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.Dv NULL
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on failure.
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.Sh SEE ALSO
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.Xr kvm 3 ,
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.Xr kvm_close 3 ,
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.Xr kvm_geterr 3 ,
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.Xr kvm_nlist 3 ,
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.Xr kvm_open 3 ,
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.Xr kvm_openfiles 3 ,
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.Xr kvm_read 3 ,
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.Xr kvm_write 3
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.Sh BUGS
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These routines do not belong in the kvm interface.
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