annotate lib/acl-internal.h @ 14079:97fc9a21a8fb

maint: update almost all copyright ranges to include 2011 Run the new "make update-copyright" rule.
author Jim Meyering <meyering@redhat.com>
date Sat, 01 Jan 2011 20:17:23 +0100
parents 87aaf9340686
children a9b67d6b93df
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1 /* Internal implementation of access control lists.
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2
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3 Copyright (C) 2002-2003, 2005-2011 Free Software 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 3 of the License, or
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8 (at your option) 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, see <http://www.gnu.org/licenses/>.
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17
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18 Written by Paul Eggert, Andreas Grünbacher, and Bruno Haible. */
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19
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20 #include "acl.h"
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21
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22 #include <stdbool.h>
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23 #include <stdlib.h>
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24
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25 /* All systems define the ACL related API in <sys/acl.h>. */
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26 #if HAVE_SYS_ACL_H
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27 # include <sys/acl.h>
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28 #endif
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29 #if defined HAVE_FACL && ! defined GETACLCNT && defined ACL_CNT
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30 # define GETACLCNT ACL_CNT
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31 #endif
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32
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33 /* On Linux, additional ACL related API is available in <acl/libacl.h>. */
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34 #ifdef HAVE_ACL_LIBACL_H
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35 # include <acl/libacl.h>
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36 #endif
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37
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38 #include "error.h"
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39 #include "quote.h"
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40
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41 #include <errno.h>
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42 #ifndef ENOSYS
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43 # define ENOSYS (-1)
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44 #endif
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45 #ifndef ENOTSUP
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46 # define ENOTSUP (-1)
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47 #endif
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48
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49 #ifndef HAVE_FCHMOD
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50 # define HAVE_FCHMOD false
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51 # define fchmod(fd, mode) (-1)
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52 #endif
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53
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54 /* Recognize some common errors such as from an NFS mount that does
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55 not support ACLs, even when local drives do. */
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56 #if defined __APPLE__ && defined __MACH__ /* MacOS X */
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57 # define ACL_NOT_WELL_SUPPORTED(Err) \
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58 ((Err) == ENOTSUP || (Err) == ENOSYS || (Err) == EINVAL || (Err) == EBUSY || (Err) == ENOENT)
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59 #elif defined EOPNOTSUPP /* Tru64 NFS */
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60 # define ACL_NOT_WELL_SUPPORTED(Err) \
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61 ((Err) == ENOTSUP || (Err) == ENOSYS || (Err) == EINVAL || (Err) == EBUSY || (Err) == EOPNOTSUPP)
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62 #else
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63 # define ACL_NOT_WELL_SUPPORTED(Err) \
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64 ((Err) == ENOTSUP || (Err) == ENOSYS || (Err) == EINVAL || (Err) == EBUSY)
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65 #endif
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66
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67 #if USE_ACL
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68
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69 # if HAVE_ACL_GET_FILE
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70 /* POSIX 1003.1e (draft 17 -- abandoned) specific version. */
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71 /* Linux, FreeBSD, MacOS X, IRIX, Tru64 */
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72
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73 # ifndef MIN_ACL_ENTRIES
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74 # define MIN_ACL_ENTRIES 4
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75 # endif
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76
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77 /* POSIX 1003.1e (draft 17) */
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78 # ifdef HAVE_ACL_GET_FD
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79 /* Most platforms have a 1-argument acl_get_fd, only OSF/1 has a 2-argument
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80 macro(!). */
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81 # if HAVE_ACL_FREE_TEXT /* OSF/1 */
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82 static inline acl_t
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83 rpl_acl_get_fd (int fd)
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84 {
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85 return acl_get_fd (fd, ACL_TYPE_ACCESS);
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86 }
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87 # undef acl_get_fd
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88 # define acl_get_fd rpl_acl_get_fd
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89 # endif
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90 # else
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91 # define HAVE_ACL_GET_FD false
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92 # undef acl_get_fd
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93 # define acl_get_fd(fd) (NULL)
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94 # endif
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95
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96 /* POSIX 1003.1e (draft 17) */
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97 # ifdef HAVE_ACL_SET_FD
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98 /* Most platforms have a 2-argument acl_set_fd, only OSF/1 has a 3-argument
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99 macro(!). */
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100 # if HAVE_ACL_FREE_TEXT /* OSF/1 */
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101 static inline int
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102 rpl_acl_set_fd (int fd, acl_t acl)
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103 {
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104 return acl_set_fd (fd, ACL_TYPE_ACCESS, acl);
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105 }
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106 # undef acl_set_fd
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107 # define acl_set_fd rpl_acl_set_fd
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108 # endif
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109 # else
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110 # define HAVE_ACL_SET_FD false
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111 # undef acl_set_fd
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112 # define acl_set_fd(fd, acl) (-1)
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113 # endif
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114
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115 /* POSIX 1003.1e (draft 13) */
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116 # if ! HAVE_ACL_FREE_TEXT
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117 # define acl_free_text(buf) acl_free (buf)
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118 # endif
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119
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120 /* Linux-specific */
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121 # ifndef HAVE_ACL_EXTENDED_FILE
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122 # define HAVE_ACL_EXTENDED_FILE false
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123 # define acl_extended_file(name) (-1)
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124 # endif
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125
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126 /* Linux-specific */
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127 # ifndef HAVE_ACL_FROM_MODE
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128 # define HAVE_ACL_FROM_MODE false
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129 # define acl_from_mode(mode) (NULL)
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130 # endif
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131
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132 /* Set to 1 if a file's mode is implicit by the ACL.
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133 Set to 0 if a file's mode is stored independently from the ACL. */
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134 # if HAVE_ACL_COPY_EXT_NATIVE && HAVE_ACL_CREATE_ENTRY_NP /* MacOS X */
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135 # define MODE_INSIDE_ACL 0
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136 # else
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137 # define MODE_INSIDE_ACL 1
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138 # endif
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139
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140 /* Return the number of entries in ACL.
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141 Return -1 and set errno upon failure to determine it. */
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142 /* Define a replacement for acl_entries if needed. (Only Linux has it.) */
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143 # if !HAVE_ACL_ENTRIES
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144 # define acl_entries rpl_acl_entries
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145 extern int acl_entries (acl_t);
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146 # endif
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147
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148 # if HAVE_ACL_TYPE_EXTENDED /* MacOS X */
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149 /* ACL is an ACL, from a file, stored as type ACL_TYPE_EXTENDED.
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150 Return 1 if the given ACL is non-trivial.
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151 Return 0 if it is trivial. */
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152 extern int acl_extended_nontrivial (acl_t);
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153 # else
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154 /* ACL is an ACL, from a file, stored as type ACL_TYPE_ACCESS.
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155 Return 1 if the given ACL is non-trivial.
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156 Return 0 if it is trivial, i.e. equivalent to a simple stat() mode.
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157 Return -1 and set errno upon failure to determine it. */
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158 extern int acl_access_nontrivial (acl_t);
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159 # endif
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160
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161 # elif HAVE_FACL && defined GETACL /* Solaris, Cygwin, not HP-UX */
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162
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163 /* Set to 1 if a file's mode is implicit by the ACL.
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164 Set to 0 if a file's mode is stored independently from the ACL. */
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165 # if defined __CYGWIN__ /* Cygwin */
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166 # define MODE_INSIDE_ACL 0
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167 # else /* Solaris */
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168 # define MODE_INSIDE_ACL 1
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169 # endif
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170
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171 # if !defined ACL_NO_TRIVIAL /* Solaris <= 10, Cygwin */
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172
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173 /* Return 1 if the given ACL is non-trivial.
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174 Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
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175 extern int acl_nontrivial (int count, aclent_t *entries);
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176
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177 # ifdef ACE_GETACL /* Solaris 10 */
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178
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179 /* Test an ACL retrieved with ACE_GETACL.
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180 Return 1 if the given ACL, consisting of COUNT entries, is non-trivial.
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181 Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
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182 extern int acl_ace_nontrivial (int count, ace_t *entries);
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183
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184 /* Definitions for when the built executable is executed on Solaris 10
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185 (newer version) or Solaris 11. */
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186 /* For a_type. */
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187 # define ACE_ACCESS_ALLOWED_ACE_TYPE 0 /* replaces ALLOW */
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188 # define ACE_ACCESS_DENIED_ACE_TYPE 1 /* replaces DENY */
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189 /* For a_flags. */
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190 # define NEW_ACE_OWNER 0x1000
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191 # define NEW_ACE_GROUP 0x2000
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192 # define NEW_ACE_IDENTIFIER_GROUP 0x0040
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193 # define ACE_EVERYONE 0x4000
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194 /* For a_access_mask. */
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195 # define NEW_ACE_READ_DATA 0x001 /* corresponds to 'r' */
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196 # define NEW_ACE_WRITE_DATA 0x002 /* corresponds to 'w' */
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197 # define NEW_ACE_EXECUTE 0x004 /* corresponds to 'x' */
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198
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199 # endif
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200
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201 # endif
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202
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203 # elif HAVE_GETACL /* HP-UX */
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204
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205 /* Return 1 if the given ACL is non-trivial.
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206 Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
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207 extern int acl_nontrivial (int count, struct acl_entry *entries, struct stat *sb);
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208
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209 # elif HAVE_ACLX_GET && 0 /* AIX */
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210
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211 /* TODO */
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212
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213 # elif HAVE_STATACL /* older AIX */
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214
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215 /* Return 1 if the given ACL is non-trivial.
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216 Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
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217 extern int acl_nontrivial (struct acl *a);
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218
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219 # elif HAVE_ACLSORT /* NonStop Kernel */
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220
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221 /* Return 1 if the given ACL is non-trivial.
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222 Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */
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223 extern int acl_nontrivial (int count, struct acl *entries);
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224
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225 # endif
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226
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227 #endif