Add libkvm man pages

freebsd-userspace/lib/libkvm/kvm_geterr.3

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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.
+.\" 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_geterr.3	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt KVM_GETERR 3
+.Os
+.Sh NAME
+.Nm kvm_geterr
+.Nd get error message on kvm descriptor
+.Sh LIBRARY
+.Lb libkvm
+.Sh SYNOPSIS
+.In kvm.h
+.Ft char *
+.Fn kvm_geterr "kvm_t *kd"
+.Sh DESCRIPTION
+This function returns a string describing the most recent error condition
+on the descriptor
+.Fa kd .
+The results are undefined if the most recent
+.Xr kvm 3
+library call did not produce an error.
+The string returned is stored in memory owned by
+.Xr kvm 3
+so the message should be copied out and saved elsewhere if necessary.
+.Sh SEE ALSO
+.Xr kvm 3 ,
+.Xr kvm_close 3 ,
+.Xr kvm_getargv 3 ,
+.Xr kvm_getenvv 3 ,
+.Xr kvm_getprocs 3 ,
+.Xr kvm_nlist 3 ,
+.Xr kvm_open 3 ,
+.Xr kvm_openfiles 3 ,
+.Xr kvm_read 3 ,
+.Xr kvm_write 3
+.Sh BUGS
+This routine cannot be used to access error conditions due to a failed
+.Fn kvm_openfiles
+call, since failure is indicated by returning a
+.Dv NULL
+descriptor.
+Therefore, errors on open are output to the special error buffer
+passed to
+.Fn kvm_openfiles .
+This option is not available to
+.Fn kvm_open .