NetBSD/lib/libkvm/kvm_getprocs.3

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.\" $NetBSD: kvm_getprocs.3,v 1.6 2000/04/15 04:38:47 simonb Exp $
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.\"
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.\" 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. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. 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
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" @(#)kvm_getprocs.3 8.1 (Berkeley) 6/4/93
.\"
.Dd June 4, 1993
.Dt KVM_GETPROCS 3
.Os
.Sh NAME
.Nm kvm_getprocs ,
.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
.Lb libkvm
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.Sh SYNOPSIS
.Fd #include <kvm.h>
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.Fd #include <sys/sysctl.h>
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.\" .Fa kvm_t *kd
.br
.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"
.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
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.It Sy KERN_PROC_ALL
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all processes
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.It Sy KERN_PROC_PID
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processes with process id
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.Fa arg
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.It Sy KERN_PROC_PGRP
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processes with process group
.Fa arg
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.It Sy KERN_PROC_SESSION
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processes with session
.Fa arg
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.It Sy KERN_PROC_TTY
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processes with tty
.Fa arg
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.It Sy KERN_PROC_UID
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processes with effective user id
.Fa arg
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.It Sy KERN_PROC_RUID
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processes with real user 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 kinfo_proc structures.
This memory is locally allocated, and subsequent calls to
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.Fn kvm_getprocs
and
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.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
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.Fn kvm_getargv
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returns a null-terminated argument vector that corresponds to the
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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
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The
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.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
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is zero, no limit is imposed and all argument strings are returned in
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their entirety.
.Pp
The memory allocated to the argv pointers and string storage
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is owned by the kvm library. Subsequent
.Fn kvm_getprocs
and
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.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.
.Sh RETURN VALUES
.Fn kvm_getprocs ,
.Fn kvm_getargv ,
and
.Fn kvm_getenvv ,
all return
.Dv NULL
on failure.
.Pp
.Sh BUGS
These routines do not belong in the kvm interface.
.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