/*      $NetBSD: getmntinfo.c,v 1.2 2020/06/17 00:16:21 kamil Exp $     */

/*
* Copyright (c) 1989, 1993
*      The Regents of the University of California.  All rights reserved.
*
* 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. 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.
*/

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)getmntinfo.c        8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: getmntinfo.c,v 1.2 2020/06/17 00:16:21 kamil Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>
#include <sys/ucred.h>
#include <sys/mount.h>

#include <rump/rump.h>
#include <rump/rump_syscallshotgun.h>
#include <rump/rump_syscalls.h>

#include <assert.h>
#include <errno.h>
#include <stdlib.h>

#define getvfsstat(a,b,c) rump_sys_getvfsstat(a,b,c)

/*
* Return information about mounted filesystems.
*/
int
getmntinfo(mntbufp, flags)
       struct statvfs **mntbufp;
       int flags;
{
       static struct statvfs *mntbuf;
       static int mntsize;
       static size_t bufsize;

       _DIAGASSERT(mntbufp != NULL);

       if (mntsize <= 0 &&
           (mntsize = getvfsstat(NULL, (size_t)0, MNT_NOWAIT)) == -1)
               return (0);
       if (bufsize > 0 &&
           (mntsize = getvfsstat(mntbuf, bufsize, flags)) == -1)
               return (0);
       while (bufsize <= mntsize * sizeof(struct statvfs)) {
               if (mntbuf)
                       free(mntbuf);
               bufsize = (mntsize + 1) * sizeof(struct statvfs);
               if ((mntbuf = malloc(bufsize)) == NULL)
                       return (0);
               if ((mntsize = getvfsstat(mntbuf, bufsize, flags)) == -1)
                       return (0);
       }
       *mntbufp = mntbuf;
       return (mntsize);
}