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 #include "namespace.h" 32 #include <sys/param.h> 33 #include <sys/mount.h> 34 #include <sys/statvfs.h> 35 36 #include <errno.h> 37 #include <limits.h> 38 #include <unistd.h> 39 #include "un-namespace.h" 40 41 static int sfs2svfs(const struct statfs *from, struct statvfs *to); 42 43 int 44 fstatvfs(int fd, struct statvfs *result) 45 { 46 struct statfs sfs; 47 int rv; 48 long pcval; 49 50 rv = _fstatfs(fd, &sfs); 51 if (rv != 0) 52 return (rv); 53 54 rv = sfs2svfs(&sfs, result); 55 if (rv != 0) 56 return (rv); 57 58 /* 59 * Whether pathconf's -1 return means error or unlimited does not 60 * make any difference in this best-effort implementation. 61 */ 62 pcval = _fpathconf(fd, _PC_NAME_MAX); 63 if (pcval == -1) 64 result->f_namemax = ~0UL; 65 else 66 result->f_namemax = (unsigned long)pcval; 67 return (0); 68 } 69 70 int 71 statvfs(const char * __restrict path, struct statvfs * __restrict result) 72 { 73 struct statfs sfs; 74 int rv; 75 long pcval; 76 77 rv = statfs(path, &sfs); 78 if (rv != 0) 79 return (rv); 80 81 sfs2svfs(&sfs, result); 82 83 /* 84 * Whether pathconf's -1 return means error or unlimited does not 85 * make any difference in this best-effort implementation. 86 */ 87 pcval = pathconf(path, _PC_NAME_MAX); 88 if (pcval == -1) 89 result->f_namemax = ~0UL; 90 else 91 result->f_namemax = (unsigned long)pcval; 92 return (0); 93 } 94 95 static int 96 sfs2svfs(const struct statfs *from, struct statvfs *to) 97 { 98 static const struct statvfs zvfs; 99 100 *to = zvfs; 101 102 if (from->f_flags & MNT_RDONLY) 103 to->f_flag |= ST_RDONLY; 104 if (from->f_flags & MNT_NOSUID) 105 to->f_flag |= ST_NOSUID; 106 107 /* XXX should we clamp negative values? */ 108 #define COPY(field) \ 109 do { \ 110 to->field = from->field; \ 111 if (from->field != to->field) { \ 112 errno = EOVERFLOW; \ 113 return (-1); \ 114 } \ 115 } while(0) 116 117 COPY(f_bavail); 118 COPY(f_bfree); 119 COPY(f_blocks); 120 COPY(f_ffree); 121 COPY(f_files); 122 to->f_bsize = from->f_iosize; 123 to->f_frsize = from->f_bsize; 124 to->f_favail = to->f_ffree; 125 return (0); 126 } 127 128 #ifdef MAIN 129 #include <err.h> 130 #include <stdint.h> 131 #include <stdio.h> 132 133 int 134 main(int argc, char **argv) 135 { 136 struct statvfs buf; 137 138 if (statvfs(argv[1], &buf) < 0) 139 err(1, "statvfs"); 140 141 #define SHOW(field) \ 142 printf(#field ": %ju\n", (uintmax_t)buf.field) 143 144 SHOW(f_bavail); 145 SHOW(f_bfree); 146 SHOW(f_blocks); 147 SHOW(f_favail); 148 SHOW(f_ffree); 149 SHOW(f_files); 150 SHOW(f_bsize); 151 SHOW(f_frsize); 152 SHOW(f_namemax); 153 printf("f_flag: %lx\n", (unsigned long)buf.f_flag); 154 155 return 0; 156 } 157 158 #endif /* MAIN */ 159