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Annotation of src/lib/libc/gen/getmntinfo.c, Revision 1.13.2.1

1.13.2.1! tron        1: /*     $NetBSD$        */
1.5       cgd         2:
1.1       cgd         3: /*
1.5       cgd         4:  * Copyright (c) 1989, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd         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.
1.12      agc        15:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        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:
1.6       christos   32: #include <sys/cdefs.h>
1.1       cgd        33: #if defined(LIBC_SCCS) && !defined(lint)
1.5       cgd        34: #if 0
                     35: static char sccsid[] = "@(#)getmntinfo.c       8.1 (Berkeley) 6/4/93";
                     36: #else
1.13.2.1! tron       37: __RCSID("$NetBSD$");
1.5       cgd        38: #endif
1.1       cgd        39: #endif /* LIBC_SCCS and not lint */
                     40:
1.13      christos   41: #define __LIBC12_SOURCE__
                     42:
1.7       jtc        43: #include "namespace.h"
1.4       cgd        44: #include <sys/param.h>
1.5       cgd        45: #include <sys/ucred.h>
1.1       cgd        46: #include <sys/mount.h>
1.9       lukem      47:
                     48: #include <assert.h>
                     49: #include <errno.h>
1.1       cgd        50: #include <stdlib.h>
1.7       jtc        51:
                     52: #ifdef __weak_alias
1.11      mycroft    53: __weak_alias(getmntinfo,_getmntinfo)
1.7       jtc        54: #endif
1.1       cgd        55:
1.13.2.1! tron       56: int _getfsstat(struct statfs12 *, long, int);
        !            57:
1.1       cgd        58: /*
                     59:  * Return information about mounted filesystems.
                     60:  */
                     61: int
                     62: getmntinfo(mntbufp, flags)
1.13      christos   63:        struct statfs12 **mntbufp;
1.1       cgd        64:        int flags;
                     65: {
1.13      christos   66:        static struct statfs12 *mntbuf;
1.1       cgd        67:        static int mntsize;
1.8       perry      68:        static size_t bufsize;
1.9       lukem      69:
                     70:        _DIAGASSERT(mntbufp != NULL);
1.1       cgd        71:
1.8       perry      72:        if (mntsize <= 0 &&
1.13.2.1! tron       73:            (mntsize = _getfsstat(NULL, 0L, MNT_NOWAIT)) == -1)
1.1       cgd        74:                return (0);
1.8       perry      75:        if (bufsize > 0 &&
1.13.2.1! tron       76:            (mntsize = _getfsstat(mntbuf, (long)bufsize, flags)) == -1)
1.1       cgd        77:                return (0);
1.13      christos   78:        while (bufsize <= mntsize * sizeof(struct statfs12)) {
1.1       cgd        79:                if (mntbuf)
                     80:                        free(mntbuf);
1.13      christos   81:                bufsize = (mntsize + 1) * sizeof(struct statfs12);
                     82:                if ((mntbuf = malloc(bufsize)) == NULL)
1.1       cgd        83:                        return (0);
1.13.2.1! tron       84:                if ((mntsize = _getfsstat(mntbuf, (long)bufsize, flags)) == -1)
1.1       cgd        85:                        return (0);
                     86:        }
                     87:        *mntbufp = mntbuf;
                     88:        return (mntsize);
                     89: }