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