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annotate lib/fsusage.c @ 4087:1546b85827ac

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Use full_read instead of safe_read.
author Bruno Haible <bruno@clisp.org>
date Tue, 17 Dec 2002 11:48:24 +0000
parents f1d0bc6f6458
children fcd34d3861a4
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1 /* fsusage.c -- return space usage of mounted filesystems
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2 Copyright (C) 1991, 1992, 1996, 1998, 1999, 2002 Free Software
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3 Foundation, Inc.
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4
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5 This program is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software Foundation,
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17 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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18
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19 #if HAVE_CONFIG_H
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20 # include <config.h>
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21 #endif
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22
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23 #if HAVE_INTTYPES_H
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24 # include <inttypes.h>
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25 #else
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26 # if HAVE_STDINT_H
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27 # include <stdint.h>
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28 # endif
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29 #endif
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30 #ifndef UINTMAX_MAX
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31 # define UINTMAX_MAX ((uintmax_t) -1)
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32 #endif
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33
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34 #include <sys/types.h>
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35 #include <sys/stat.h>
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36 #include "fsusage.h"
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37
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38 #if HAVE_LIMITS_H
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39 # include <limits.h>
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40 #endif
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41 #ifndef CHAR_BIT
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42 # define CHAR_BIT 8
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43 #endif
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44
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45 int statfs ();
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46
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47 #if HAVE_SYS_PARAM_H
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48 # include <sys/param.h>
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49 #endif
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50
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51 #if HAVE_SYS_MOUNT_H
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52 # include <sys/mount.h>
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53 #endif
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54
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55 #if HAVE_SYS_VFS_H
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56 # include <sys/vfs.h>
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57 #endif
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58
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59 #if HAVE_SYS_FS_S5PARAM_H /* Fujitsu UXP/V */
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60 # include <sys/fs/s5param.h>
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61 #endif
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62
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63 #if defined HAVE_SYS_FILSYS_H && !defined _CRAY
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64 # include <sys/filsys.h> /* SVR2 */
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65 #endif
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66
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67 #if HAVE_FCNTL_H
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68 # include <fcntl.h>
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69 #endif
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71 #if HAVE_SYS_STATFS_H
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72 # include <sys/statfs.h>
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73 #endif
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75 #if HAVE_DUSTAT_H /* AIX PS/2 */
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76 # include <sys/dustat.h>
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77 #endif
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78
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79 #if HAVE_SYS_STATVFS_H /* SVR4 */
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80 # include <sys/statvfs.h>
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81 int statvfs ();
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82 #endif
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83
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84 #include "full-read.h"
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85
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86 /* Many space usage primitives use all 1 bits to denote a value that is
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87 not applicable or unknown. Propagate this information by returning
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88 a uintmax_t value that is all 1 bits if X is all 1 bits, even if X
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89 is unsigned and narrower than uintmax_t. */
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90 #define PROPAGATE_ALL_ONES(x) \
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91 ((sizeof (x) < sizeof (uintmax_t) \
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92 && (~ (x) == (sizeof (x) < sizeof (int) \
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93 ? - (1 << (sizeof (x) * CHAR_BIT)) \
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94 : 0))) \
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95 ? UINTMAX_MAX : (x))
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96
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97 /* Extract the top bit of X as an uintmax_t value. */
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98 #define EXTRACT_TOP_BIT(x) ((x) \
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99 & ((uintmax_t) 1 << (sizeof (x) * CHAR_BIT - 1)))
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100
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101 /* If a value is negative, many space usage primitives store it into an
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102 integer variable by assignment, even if the variable's type is unsigned.
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103 So, if a space usage variable X's top bit is set, convert X to the
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104 uintmax_t value V such that (- (uintmax_t) V) is the negative of
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105 the original value. If X's top bit is clear, just yield X.
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106 Use PROPAGATE_TOP_BIT if the original value might be negative;
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107 otherwise, use PROPAGATE_ALL_ONES. */
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108 #define PROPAGATE_TOP_BIT(x) ((x) | ~ (EXTRACT_TOP_BIT (x) - 1))
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109
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110 /* Fill in the fields of FSP with information about space usage for
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111 the filesystem on which PATH resides.
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112 DISK is the device on which PATH is mounted, for space-getting
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113 methods that need to know it.
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114 Return 0 if successful, -1 if not. When returning -1, ensure that
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115 ERRNO is either a system error value, or zero if DISK is NULL
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116 on a system that requires a non-NULL value. */
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117 int
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118 get_fs_usage (const char *path, const char *disk, struct fs_usage *fsp)
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119 {
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120 #ifdef STAT_STATFS3_OSF1
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121
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122 struct statfs fsd;
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123
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124 if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
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125 return -1;
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126
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127 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
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128
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129 #endif /* STAT_STATFS3_OSF1 */
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130
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131 #ifdef STAT_STATFS2_FS_DATA /* Ultrix */
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132
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133 struct fs_data fsd;
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134
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135 if (statfs (path, &fsd) != 1)
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136 return -1;
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137
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138 fsp->fsu_blocksize = 1024;
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139 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.fd_req.btot);
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140 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.fd_req.bfree);
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141 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.fd_req.bfreen);
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142 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.fd_req.bfreen) != 0;
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143 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.fd_req.gtot);
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144 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.fd_req.gfree);
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145
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146 #endif /* STAT_STATFS2_FS_DATA */
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147
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148 #ifdef STAT_READ_FILSYS /* SVR2 */
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149 # ifndef SUPERBOFF
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150 # define SUPERBOFF (SUPERB * 512)
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151 # endif
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152
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153 struct filsys fsd;
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154 int fd;
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155
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156 if (! disk)
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157 {
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158 errno = 0;
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159 return -1;
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160 }
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161
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162 fd = open (disk, O_RDONLY);
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163 if (fd < 0)
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164 return -1;
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165 lseek (fd, (off_t) SUPERBOFF, 0);
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166 if (full_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
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167 {
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168 close (fd);
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169 return -1;
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170 }
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171 close (fd);
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172
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173 fsp->fsu_blocksize = (fsd.s_type == Fs2b ? 1024 : 512);
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174 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.s_fsize);
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175 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.s_tfree);
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176 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.s_tfree);
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177 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.s_tfree) != 0;
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178 fsp->fsu_files = (fsd.s_isize == -1
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179 ? UINTMAX_MAX
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180 : (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1));
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181 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.s_tinode);
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182
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183 #endif /* STAT_READ_FILSYS */
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184
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185 #ifdef STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX */
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186
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187 struct statfs fsd;
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188
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189 if (statfs (path, &fsd) < 0)
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190 return -1;
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191
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192 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
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193
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194 # ifdef STATFS_TRUNCATES_BLOCK_COUNTS
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195
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196 /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
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197 struct statfs are truncated to 2GB. These conditions detect that
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198 truncation, presumably without botching the 4.1.1 case, in which
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199 the values are not truncated. The correct counts are stored in
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200 undocumented spare fields. */
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201 if (fsd.f_blocks == 0x7fffffff / fsd.f_bsize && fsd.f_spare[0] > 0)
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202 {
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203 fsd.f_blocks = fsd.f_spare[0];
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204 fsd.f_bfree = fsd.f_spare[1];
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205 fsd.f_bavail = fsd.f_spare[2];
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206 }
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207 # endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
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208
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209 #endif /* STAT_STATFS2_BSIZE */
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210
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211 #ifdef STAT_STATFS2_FSIZE /* 4.4BSD */
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212
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213 struct statfs fsd;
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214
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215 if (statfs (path, &fsd) < 0)
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216 return -1;
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217
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218 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
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219
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220 #endif /* STAT_STATFS2_FSIZE */
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221
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222 #ifdef STAT_STATFS4 /* SVR3, Dynix, Irix, AIX */
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223
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224 # if !_AIX && !defined _SEQUENT_ && !defined DOLPHIN
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225 # define f_bavail f_bfree
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226 # endif
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227
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228 struct statfs fsd;
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229
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230 if (statfs (path, &fsd, sizeof fsd, 0) < 0)
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231 return -1;
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232
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233 /* Empirically, the block counts on most SVR3 and SVR3-derived
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234 systems seem to always be in terms of 512-byte blocks,
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235 no matter what value f_bsize has. */
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236 # if _AIX || defined _CRAY
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237 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
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238 # else
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239 fsp->fsu_blocksize = 512;
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240 # endif
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241
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242 #endif /* STAT_STATFS4 */
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243
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244 #ifdef STAT_STATVFS /* SVR4 */
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245
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246 struct statvfs fsd;
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247
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248 if (statvfs (path, &fsd) < 0)
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249 return -1;
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250
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251 /* f_frsize isn't guaranteed to be supported. */
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252 fsp->fsu_blocksize = (fsd.f_frsize
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253 ? PROPAGATE_ALL_ONES (fsd.f_frsize)
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254 : PROPAGATE_ALL_ONES (fsd.f_bsize));
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255
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256 #endif /* STAT_STATVFS */
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257
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258 #if !defined STAT_STATFS2_FS_DATA && !defined STAT_READ_FILSYS
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259 /* !Ultrix && !SVR2 */
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260
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261 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks);
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262 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree);
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263 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.f_bavail);
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264 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.f_bavail) != 0;
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265 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.f_files);
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266 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.f_ffree);
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267
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268 #endif /* not STAT_STATFS2_FS_DATA && not STAT_READ_FILSYS */
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269
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270 return 0;
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271 }
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272
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273 #if defined _AIX && defined _I386
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274 /* AIX PS/2 does not supply statfs. */
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275
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276 int
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277 statfs (char *path, struct statfs *fsb)
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278 {
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279 struct stat stats;
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280 struct dustat fsd;
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281
426
defe7888e2f3 (statfs): Use stat, not safe_stat.
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diff changeset
282 if (stat (path, &stats))
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283 return -1;
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284 if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
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285 return -1;
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286 fsb->f_type = 0;
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287 fsb->f_bsize = fsd.du_bsize;
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288 fsb->f_blocks = fsd.du_fsize - fsd.du_isize;
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289 fsb->f_bfree = fsd.du_tfree;
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290 fsb->f_bavail = fsd.du_tfree;
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291 fsb->f_files = (fsd.du_isize - 2) * fsd.du_inopb;
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292 fsb->f_ffree = fsd.du_tinode;
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293 fsb->f_fsid.val[0] = fsd.du_site;
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294 fsb->f_fsid.val[1] = fsd.du_pckno;
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295 return 0;
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296 }
780
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297
5
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298 #endif /* _AIX && _I386 */