.\" 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 .\" 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 June 4, 1993 .Dt KVM_GETPROCS 3 .Os .Sh NAME .Nm kvm_getprocs , .Nm kvm_getargv , .Nm kvm_getenvv .Nd access user process state .Sh SYNOPSIS .Fd #include <kvm.h> .Fd #include <sys/sysctl.h> .\" .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 .It Sy KINFO_PROC_ALL all processes .It Sy KINFO_PROC_PID processes with process id .Fa arg .It Sy KINFO_PROC_PGRP processes with process group .Fa arg .It Sy KINFO_PROC_SESSION processes with session .Fa arg .It Sy KINFO_PROC_TTY processes with tty .Fa arg .It Sy KINFO_PROC_UID processes with effective user id .Fa arg .It Sy KINFO_PROC_RUID 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 .Fn kvm_getprocs and .Fn kvm_close will overwrite this storage. .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. .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