/*      $NetBSD: procfs_auxv.c,v 1.4 2019/09/27 14:36:18 christos Exp $ */

/*-
* Copyright (c) 2017 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: procfs_auxv.c,v 1.4 2019/09/27 14:36:18 christos Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/kmem.h>

#include <miscfs/procfs/procfs.h>

int
procfs_doauxv(struct lwp *curl, struct proc *p, struct pfsnode *pfs,
    struct uio *uio)
{
       int error;
       void *buffer;
       size_t bufsize;

       if (uio->uio_rw != UIO_READ)
               return EOPNOTSUPP;

       if ((error = proc_getauxv(p, &buffer, &bufsize)) != 0)
               return error;

       if ((uintmax_t)uio->uio_offset < bufsize)
               error = uiomove((char *)buffer + uio->uio_offset,
                   bufsize - uio->uio_offset, uio);
       else
               error = 0;

       kmem_free(buffer, bufsize);
       return error;
}

int
procfs_validauxv(struct lwp *l, struct mount *mp)
{
       return l != NULL && l->l_proc != NULL && l->l_proc->p_execsw != NULL;
}