1 /* $OpenBSD: getmntinfo.c,v 1.11 2019/06/28 13:32:41 deraadt Exp $ */ 2 /* 3 * Copyright (c) 1989, 1993 4 * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/types.h> 32 #include <sys/mount.h> 33 #include <stdlib.h> 34 35 /* 36 * Return information about mounted filesystems. 37 */ 38 int 39 getmntinfo(struct statfs **mntbufp, int flags) 40 { 41 static struct statfs *mntbuf; 42 static int mntsize; 43 static size_t bufsize; 44 45 if (mntsize <= 0 && (mntsize = getfsstat(0, 0, MNT_NOWAIT)) == -1) 46 return (0); 47 if (bufsize > 0 && (mntsize = getfsstat(mntbuf, bufsize, flags)) == -1) 48 return (0); 49 while (bufsize <= mntsize * sizeof(struct statfs)) { 50 free(mntbuf); 51 bufsize = (mntsize + 1) * sizeof(struct statfs); 52 if ((mntbuf = malloc(bufsize)) == NULL) { 53 bufsize = 0; 54 return (0); 55 } 56 if ((mntsize = getfsstat(mntbuf, bufsize, flags)) == -1) 57 return (0); 58 } 59 *mntbufp = mntbuf; 60 return (mntsize); 61 } 62