1 /*
2 * Copyright 2002 Massachusetts Institute of Technology
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission. M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose. It is provided "as is" without express or implied
14 * warranty.
15 *
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: stable/12/lib/libc/gen/statvfs.c 103012 2002-09-06 11:24:06Z tjr $");
32
33 #include "namespace.h"
34 #include <sys/param.h>
35 #include <sys/mount.h>
36 #include <sys/statvfs.h>
37
38 #include <errno.h>
39 #include <limits.h>
40 #include <unistd.h>
41 #include "un-namespace.h"
42
43 static int sfs2svfs(const struct statfs *from, struct statvfs *to);
44
45 int
fstatvfs(int fd,struct statvfs * result)46 fstatvfs(int fd, struct statvfs *result)
47 {
48 struct statfs sfs;
49 int rv;
50 long pcval;
51
52 rv = _fstatfs(fd, &sfs);
53 if (rv != 0)
54 return (rv);
55
56 rv = sfs2svfs(&sfs, result);
57 if (rv != 0)
58 return (rv);
59
60 /*
61 * Whether pathconf's -1 return means error or unlimited does not
62 * make any difference in this best-effort implementation.
63 */
64 pcval = _fpathconf(fd, _PC_NAME_MAX);
65 if (pcval == -1)
66 result->f_namemax = ~0UL;
67 else
68 result->f_namemax = (unsigned long)pcval;
69 return (0);
70 }
71
72 int
statvfs(const char * __restrict path,struct statvfs * __restrict result)73 statvfs(const char * __restrict path, struct statvfs * __restrict result)
74 {
75 struct statfs sfs;
76 int rv;
77 long pcval;
78
79 rv = statfs(path, &sfs);
80 if (rv != 0)
81 return (rv);
82
83 sfs2svfs(&sfs, result);
84
85 /*
86 * Whether pathconf's -1 return means error or unlimited does not
87 * make any difference in this best-effort implementation.
88 */
89 pcval = pathconf(path, _PC_NAME_MAX);
90 if (pcval == -1)
91 result->f_namemax = ~0UL;
92 else
93 result->f_namemax = (unsigned long)pcval;
94 return (0);
95 }
96
97 static int
sfs2svfs(const struct statfs * from,struct statvfs * to)98 sfs2svfs(const struct statfs *from, struct statvfs *to)
99 {
100 static const struct statvfs zvfs;
101
102 *to = zvfs;
103
104 if (from->f_flags & MNT_RDONLY)
105 to->f_flag |= ST_RDONLY;
106 if (from->f_flags & MNT_NOSUID)
107 to->f_flag |= ST_NOSUID;
108
109 /* XXX should we clamp negative values? */
110 #define COPY(field) \
111 do { \
112 to->field = from->field; \
113 if (from->field != to->field) { \
114 errno = EOVERFLOW; \
115 return (-1); \
116 } \
117 } while(0)
118
119 COPY(f_bavail);
120 COPY(f_bfree);
121 COPY(f_blocks);
122 COPY(f_ffree);
123 COPY(f_files);
124 to->f_bsize = from->f_iosize;
125 to->f_frsize = from->f_bsize;
126 to->f_favail = to->f_ffree;
127 return (0);
128 }
129
130 #ifdef MAIN
131 #include <err.h>
132 #include <stdint.h>
133 #include <stdio.h>
134
135 int
main(int argc,char ** argv)136 main(int argc, char **argv)
137 {
138 struct statvfs buf;
139
140 if (statvfs(argv[1], &buf) < 0)
141 err(1, "statvfs");
142
143 #define SHOW(field) \
144 printf(#field ": %ju\n", (uintmax_t)buf.field)
145
146 SHOW(f_bavail);
147 SHOW(f_bfree);
148 SHOW(f_blocks);
149 SHOW(f_favail);
150 SHOW(f_ffree);
151 SHOW(f_files);
152 SHOW(f_bsize);
153 SHOW(f_frsize);
154 SHOW(f_namemax);
155 printf("f_flag: %lx\n", (unsigned long)buf.f_flag);
156
157 return 0;
158 }
159
160 #endif /* MAIN */
161