1 /* $NetBSD: getmntinfo.c,v 1.12 2003/08/07 16:42:50 agc Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)getmntinfo.c 8.1 (Berkeley) 6/4/93"; 36 #else 37 __RCSID("$NetBSD: getmntinfo.c,v 1.12 2003/08/07 16:42:50 agc Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 #include <sys/param.h> 43 #include <sys/ucred.h> 44 #include <sys/mount.h> 45 46 #include <assert.h> 47 #include <errno.h> 48 #include <stdlib.h> 49 50 #ifdef __weak_alias 51 __weak_alias(getmntinfo,_getmntinfo) 52 #endif 53 54 /* 55 * Return information about mounted filesystems. 56 */ 57 int 58 getmntinfo(mntbufp, flags) 59 struct statfs **mntbufp; 60 int flags; 61 { 62 static struct statfs *mntbuf; 63 static int mntsize; 64 static size_t bufsize; 65 66 _DIAGASSERT(mntbufp != NULL); 67 68 if (mntsize <= 0 && 69 (mntsize = getfsstat(NULL, 0L, MNT_NOWAIT)) < 0) 70 return (0); 71 if (bufsize > 0 && 72 (mntsize = getfsstat(mntbuf, (long)bufsize, flags)) < 0) 73 return (0); 74 while (bufsize <= mntsize * sizeof(struct statfs)) { 75 if (mntbuf) 76 free(mntbuf); 77 bufsize = (mntsize + 1) * sizeof(struct statfs); 78 if ((mntbuf = (struct statfs *)malloc(bufsize)) == 0) 79 return (0); 80 if ((mntsize = getfsstat(mntbuf, (long)bufsize, flags)) < 0) 81 return (0); 82 } 83 *mntbufp = mntbuf; 84 return (mntsize); 85 } 86