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/*
* Copyright 2002 Massachusetts Institute of Technology
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that both the above copyright notice and this
* permission notice appear in all copies, that both the above
* copyright notice and this permission notice appear in all
* supporting documentation, and that the name of M.I.T. not be used
* in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. M.I.T. makes
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "namespace.h"
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/statvfs.h>
#include <errno.h>
#include <limits.h>
#include <unistd.h>
#include "un-namespace.h"
static int sfs2svfs(const struct statfs *from, struct statvfs *to);
int
fstatvfs(int fd, struct statvfs *result)
{
struct statfs sfs;
int rv;
long pcval;
rv = _fstatfs(fd, &sfs);
if (rv != 0)
return (rv);
rv = sfs2svfs(&sfs, result);
if (rv != 0)
return (rv);
/*
* Whether pathconf's -1 return means error or unlimited does not
* make any difference in this best-effort implementation.
*/
pcval = _fpathconf(fd, _PC_NAME_MAX);
if (pcval == -1)
result->f_namemax = ~0UL;
else
result->f_namemax = (unsigned long)pcval;
return (0);
}
int
statvfs(const char * __restrict path, struct statvfs * __restrict result)
{
struct statfs sfs;
int rv;
long pcval;
rv = statfs(path, &sfs);
if (rv != 0)
return (rv);
sfs2svfs(&sfs, result);
/*
* Whether pathconf's -1 return means error or unlimited does not
* make any difference in this best-effort implementation.
*/
pcval = pathconf(path, _PC_NAME_MAX);
if (pcval == -1)
result->f_namemax = ~0UL;
else
result->f_namemax = (unsigned long)pcval;
return (0);
}
static int
sfs2svfs(const struct statfs *from, struct statvfs *to)
{
static const struct statvfs zvfs;
*to = zvfs;
if (from->f_flags & MNT_RDONLY)
to->f_flag |= ST_RDONLY;
if (from->f_flags & MNT_NOSUID)
to->f_flag |= ST_NOSUID;
/* XXX should we clamp negative values? */
#define COPY(field) \
do { \
to->field = from->field; \
if (from->field != to->field) { \
errno = EOVERFLOW; \
return (-1); \
} \
} while(0)
COPY(f_bavail);
COPY(f_bfree);
COPY(f_blocks);
COPY(f_ffree);
COPY(f_files);
to->f_bsize = from->f_iosize;
to->f_frsize = from->f_bsize;
to->f_favail = to->f_ffree;
return (0);
}
#ifdef MAIN
#include <err.h>
#include <stdint.h>
#include <stdio.h>
int
main(int argc, char **argv)
{
struct statvfs buf;
if (statvfs(argv[1], &buf) < 0)
err(1, "statvfs");
#define SHOW(field) \
printf(#field ": %ju\n", (uintmax_t)buf.field)
SHOW(f_bavail);
SHOW(f_bfree);
SHOW(f_blocks);
SHOW(f_favail);
SHOW(f_ffree);
SHOW(f_files);
SHOW(f_bsize);
SHOW(f_frsize);
SHOW(f_namemax);
printf("f_flag: %lx\n", (unsigned long)buf.f_flag);
return 0;
}
#endif /* MAIN */
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