lib/libc/gen/getmntvinfo.c

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 2008 The DragonFly Project.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. All advertising materials mentioning features or use of this software
  15  *    must display the following acknowledgement:
  16  *      This product includes software developed by the University of
  17  *      California, Berkeley and its contributors.
  18  * 4. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * @(#)getmntinfo.c     8.1 (Berkeley) 6/4/93
  35  * $DragonFly: src/lib/libc/gen/getmntvinfo.c,v 1.1 2008/06/01 20:46:44 dillon Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/ucred.h>
  40 #include <sys/mount.h>
  41 #include <sys/statvfs.h>
  42 #include <stdlib.h>
  43
  44 /*
  45  * Return information about mounted filesystems.
  46  */
  47 int
  48 getmntvinfo(struct statfs **mntbufp, struct statvfs **mntvbufp, int flags)
  49 {
  50         static struct statfs *mntsbuf;
  51         static struct statvfs *mntvbuf;
  52         static int mntsize;
  53         static int bufsize;
  54         static int vbufsize;
  55
  56         if (mntsize <= 0 && (mntsize = getvfsstat(NULL, NULL, 0, MNT_NOWAIT)) < 0)
  57                 return (0);
  58         if (vbufsize > 0 && (mntsize = getvfsstat(mntsbuf, mntvbuf, vbufsize, flags)) < 0)
  59                 return (0);
  60         while (vbufsize <= mntsize * (int)sizeof(struct statvfs)) {
  61                 if (mntsbuf)
  62                         free(mntsbuf);
  63                 bufsize = (mntsize + 1) * sizeof(struct statfs);
  64                 vbufsize = (mntsize + 1) * sizeof(struct statvfs);
  65                 if ((mntsbuf = (struct statfs *)malloc(bufsize)) == 0)
  66                         return (0);
  67                 if ((mntvbuf = (struct statvfs *)malloc(vbufsize)) == 0)
  68                         return (0);
  69                 if ((mntsize = getvfsstat(mntsbuf, mntvbuf, vbufsize, flags)) < 0)
  70                         return (0);
  71         }
  72         *mntbufp = mntsbuf;
  73         *mntvbufp = mntvbuf;
  74         return (mntsize);
  75 }
  76