getmntinfo.c revision 302408
1200583Srdivacky/* 2200583Srdivacky * Copyright (c) 1989, 1993 3200583Srdivacky * The Regents of the University of California. All rights reserved. 4200583Srdivacky * 5200583Srdivacky * Redistribution and use in source and binary forms, with or without 6200583Srdivacky * modification, are permitted provided that the following conditions 7200583Srdivacky * are met: 8200583Srdivacky * 1. Redistributions of source code must retain the above copyright 9200583Srdivacky * notice, this list of conditions and the following disclaimer. 10200583Srdivacky * 2. Redistributions in binary form must reproduce the above copyright 11200583Srdivacky * notice, this list of conditions and the following disclaimer in the 12200583Srdivacky * documentation and/or other materials provided with the distribution. 13200583Srdivacky * 4. Neither the name of the University nor the names of its contributors 14200583Srdivacky * may be used to endorse or promote products derived from this software 15200583Srdivacky * without specific prior written permission. 16200583Srdivacky * 17200583Srdivacky * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18200583Srdivacky * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19200583Srdivacky * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20200583Srdivacky * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21200583Srdivacky * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22200583Srdivacky * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23200583Srdivacky * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24200583Srdivacky * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25200583Srdivacky * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26200583Srdivacky * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27200583Srdivacky * SUCH DAMAGE. 28200583Srdivacky */ 29200583Srdivacky 30200583Srdivacky#if defined(LIBC_SCCS) && !defined(lint) 31200583Srdivackystatic char sccsid[] = "@(#)getmntinfo.c 8.1 (Berkeley) 6/4/93"; 32200583Srdivacky#endif /* LIBC_SCCS and not lint */ 33200583Srdivacky#include <sys/cdefs.h> 34200583Srdivacky__FBSDID("$FreeBSD: stable/11/lib/libc/gen/getmntinfo.c 297790 2016-04-10 19:33:58Z pfg $"); 35200583Srdivacky 36200583Srdivacky#include <sys/param.h> 37200583Srdivacky#include <sys/ucred.h> 38200583Srdivacky#include <sys/mount.h> 39200583Srdivacky#include <stdlib.h> 40200583Srdivacky 41200583Srdivacky/* 42200583Srdivacky * Return information about mounted filesystems. 43200583Srdivacky */ 44200583Srdivackyint 45200583Srdivackygetmntinfo(struct statfs **mntbufp, int flags) 46200583Srdivacky{ 47200583Srdivacky static struct statfs *mntbuf; 48200583Srdivacky static int mntsize; 49200583Srdivacky static long bufsize; 50200583Srdivacky 51200583Srdivacky if (mntsize <= 0 && (mntsize = getfsstat(0, 0, MNT_NOWAIT)) < 0) 52200583Srdivacky return (0); 53200583Srdivacky if (bufsize > 0 && (mntsize = getfsstat(mntbuf, bufsize, flags)) < 0) 54200583Srdivacky return (0); 55200583Srdivacky while (bufsize <= mntsize * sizeof(struct statfs)) { 56200583Srdivacky if (mntbuf) 57200583Srdivacky free(mntbuf); 58200583Srdivacky bufsize = (mntsize + 1) * sizeof(struct statfs); 59200583Srdivacky if ((mntbuf = malloc(bufsize)) == NULL) 60200583Srdivacky return (0); 61200583Srdivacky if ((mntsize = getfsstat(mntbuf, bufsize, flags)) < 0) 62200583Srdivacky return (0); 63200583Srdivacky } 64200583Srdivacky *mntbufp = mntbuf; 65200583Srdivacky return (mntsize); 66200583Srdivacky} 67200583Srdivacky