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annotate src/ch/ethz/ssh2/sftp/OpenFlags.java @ 337:0d0d2fc9918c ganymed

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merge
author Carl Byington <carl@five-ten-sg.com>
date Thu, 31 Jul 2014 15:00:28 -0700
parents 91a31873c42a
children
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1 /*
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2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
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3 * Please refer to the LICENSE.txt for licensing details.
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4 */
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5 package ch.ethz.ssh2.sftp;
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6
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7 /**
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8 * SFTP Open Flags.
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9 * <p/>
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10 * The following table is provided to assist in mapping POSIX semantics
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11 * to equivalent SFTP file open parameters:
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12 * <p/>
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13 * <ul>
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14 * <li>O_RDONLY
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15 * <ul><li>desired-access = READ_DATA | READ_ATTRIBUTES</li></ul>
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16 * </li>
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17 * </ul>
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18 * <ul>
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19 * <li>O_WRONLY
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20 * <ul><li>desired-access = WRITE_DATA | WRITE_ATTRIBUTES</li></ul>
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21 * </li>
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22 * </ul>
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23 * <ul>
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24 * <li>O_RDWR
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25 * <ul><li>desired-access = READ_DATA | READ_ATTRIBUTES | WRITE_DATA | WRITE_ATTRIBUTES</li></ul>
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26 * </li>
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27 * </ul>
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28 * <ul>
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29 * <li>O_APPEND
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30 * <ul>
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31 * <li>desired-access = WRITE_DATA | WRITE_ATTRIBUTES | APPEND_DATA</li>
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32 * <li>flags = SSH_FXF_ACCESS_APPEND_DATA and or SSH_FXF_ACCESS_APPEND_DATA_ATOMIC</li>
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33 * </ul>
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34 * </li>
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35 * </ul>
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36 * <ul>
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37 * <li>O_CREAT
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38 * <ul>
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39 * <li>flags = SSH_FXF_OPEN_OR_CREATE</li>
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40 * </ul>
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41 * </li>
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42 * </ul>
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43 * <ul>
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44 * <li>O_TRUNC
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45 * <ul>
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46 * <li>flags = SSH_FXF_TRUNCATE_EXISTING</li>
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47 * </ul>
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48 * </li>
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49 * </ul>
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50 * <ul>
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51 * <li>O_TRUNC|O_CREATE
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52 * <ul>
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53 * <li>flags = SSH_FXF_CREATE_TRUNCATE</li>
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54 * </ul>
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55 * </li>
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56 * </ul>
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57 *
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58 * @author Christian Plattner
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59 * @version 2.50, 03/15/10
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60 */
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61 public final class OpenFlags {
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62 private OpenFlags() {
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63 }
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64
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65 /**
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66 * Disposition is a 3 bit field that controls how the file is opened.
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67 * The server MUST support these bits (possible enumaration values:
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68 * SSH_FXF_CREATE_NEW, SSH_FXF_CREATE_TRUNCATE, SSH_FXF_OPEN_EXISTING,
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69 * SSH_FXF_OPEN_OR_CREATE or SSH_FXF_TRUNCATE_EXISTING).
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70 */
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71 public static final int SSH_FXF_ACCESS_DISPOSITION = 0x00000007;
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72
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73 /**
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74 * A new file is created; if the file already exists, the server
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75 * MUST return status SSH_FX_FILE_ALREADY_EXISTS.
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76 */
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77 public static final int SSH_FXF_CREATE_NEW = 0x00000000;
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78
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79 /**
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80 * A new file is created; if the file already exists, it is opened
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81 * and truncated.
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82 */
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83 public static final int SSH_FXF_CREATE_TRUNCATE = 0x00000001;
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84
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85 /**
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86 * An existing file is opened. If the file does not exist, the
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87 * server MUST return SSH_FX_NO_SUCH_FILE. If a directory in the
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88 * path does not exist, the server SHOULD return
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89 * SSH_FX_NO_SUCH_PATH. It is also acceptable if the server
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90 * returns SSH_FX_NO_SUCH_FILE in this case.
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91 */
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92 public static final int SSH_FXF_OPEN_EXISTING = 0x00000002;
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93
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94 /**
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95 * If the file exists, it is opened. If the file does not exist,
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96 * it is created.
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97 */
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98 public static final int SSH_FXF_OPEN_OR_CREATE = 0x00000003;
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99
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100 /**
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101 * An existing file is opened and truncated. If the file does not
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102 * exist, the server MUST return the same error codes as defined
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103 * for SSH_FXF_OPEN_EXISTING.
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104 */
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105 public static final int SSH_FXF_TRUNCATE_EXISTING = 0x00000004;
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106
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107 /**
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108 * Data is always written at the end of the file. The offset field
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109 * of the SSH_FXP_WRITE requests are ignored.
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110 * <p/>
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111 * Data is not required to be appended atomically. This means that
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112 * if multiple writers attempt to append data simultaneously, data
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113 * from the first may be lost. However, data MAY be appended
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114 * atomically.
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115 */
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116 public static final int SSH_FXF_ACCESS_APPEND_DATA = 0x00000008;
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117
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118 /**
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119 * Data is always written at the end of the file. The offset field
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120 * of the SSH_FXP_WRITE requests are ignored.
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121 * <p/>
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122 * Data MUST be written atomically so that there is no chance that
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123 * multiple appenders can collide and result in data being lost.
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124 * <p/>
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125 * If both append flags are specified, the server SHOULD use atomic
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126 * append if it is available, but SHOULD use non-atomic appends
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127 * otherwise. The server SHOULD NOT fail the request in this case.
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128 */
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129 public static final int SSH_FXF_ACCESS_APPEND_DATA_ATOMIC = 0x00000010;
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130
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131 /**
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132 * Indicates that the server should treat the file as text and
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133 * convert it to the canonical newline convention in use.
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134 * (See Determining Server Newline Convention in section 5.3 in the
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135 * SFTP standard draft).
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136 * <p/>
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137 * When a file is opened with this flag, the offset field in the read
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138 * and write functions is ignored.
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139 * <p/>
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140 * Servers MUST process multiple, parallel reads and writes correctly
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141 * in this mode. Naturally, it is permissible for them to do this by
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142 * serializing the requests.
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143 * <p/>
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144 * Clients SHOULD use the SSH_FXF_ACCESS_APPEND_DATA flag to append
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145 * data to a text file rather then using write with a calculated offset.
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146 */
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147 public static final int SSH_FXF_ACCESS_TEXT_MODE = 0x00000020;
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148
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149 /**
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150 * The server MUST guarantee that no other handle has been opened
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151 * with ACE4_READ_DATA access, and that no other handle will be
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152 * opened with ACE4_READ_DATA access until the client closes the
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153 * handle. (This MUST apply both to other clients and to other
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154 * processes on the server.)
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155 * <p/>
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156 * If there is a conflicting lock the server MUST return
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157 * SSH_FX_LOCK_CONFLICT. If the server cannot make the locking
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158 * guarantee, it MUST return SSH_FX_OP_UNSUPPORTED.
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159 * <p/>
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160 * Other handles MAY be opened for ACE4_WRITE_DATA or any other
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161 * combination of accesses, as long as ACE4_READ_DATA is not included
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162 * in the mask.
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163 */
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164 public static final int SSH_FXF_ACCESS_BLOCK_READ = 0x00000040;
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165
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166 /**
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167 * The server MUST guarantee that no other handle has been opened
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168 * with ACE4_WRITE_DATA or ACE4_APPEND_DATA access, and that no other
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169 * handle will be opened with ACE4_WRITE_DATA or ACE4_APPEND_DATA
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170 * access until the client closes the handle. (This MUST apply both
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171 * to other clients and to other processes on the server.)
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172 * <p/>
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173 * If there is a conflicting lock the server MUST return
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174 * SSH_FX_LOCK_CONFLICT. If the server cannot make the locking
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175 * guarantee, it MUST return SSH_FX_OP_UNSUPPORTED.
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176 * <p/>
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177 * Other handles MAY be opened for ACE4_READ_DATA or any other
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178 * combination of accesses, as long as neither ACE4_WRITE_DATA nor
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179 * ACE4_APPEND_DATA are included in the mask.
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180 */
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181 public static final int SSH_FXF_ACCESS_BLOCK_WRITE = 0x00000080;
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182
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183 /**
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184 * The server MUST guarantee that no other handle has been opened
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185 * with ACE4_DELETE access, opened with the
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186 * SSH_FXF_ACCESS_DELETE_ON_CLOSE flag set, and that no other handle
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187 * will be opened with ACE4_DELETE access or with the
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188 * SSH_FXF_ACCESS_DELETE_ON_CLOSE flag set, and that the file itself
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189 * is not deleted in any other way until the client closes the handle.
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190 * <p/>
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191 * If there is a conflicting lock the server MUST return
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192 * SSH_FX_LOCK_CONFLICT. If the server cannot make the locking
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193 * guarantee, it MUST return SSH_FX_OP_UNSUPPORTED.
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194 */
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195 public static final int SSH_FXF_ACCESS_BLOCK_DELETE = 0x00000100;
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196
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197 /**
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198 * If this bit is set, the above BLOCK modes are advisory. In advisory
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199 * mode, only other accesses that specify a BLOCK mode need be
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200 * considered when determining whether the BLOCK can be granted,
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201 * and the server need not prevent I/O operations that violate the
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202 * block mode.
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203 * <p/>
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204 * The server MAY perform mandatory locking even if the BLOCK_ADVISORY
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205 * bit is set.
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206 */
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207 public static final int SSH_FXF_ACCESS_BLOCK_ADVISORY = 0x00000200;
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208
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209 /**
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210 * If the final component of the path is a symlink, then the open
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211 * MUST fail, and the error SSH_FX_LINK_LOOP MUST be returned.
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212 */
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213 public static final int SSH_FXF_ACCESS_NOFOLLOW = 0x00000400;
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214
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215 /**
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216 * The file should be deleted when the last handle to it is closed.
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217 * (The last handle may not be an sftp-handle.) This MAY be emulated
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218 * by a server if the OS doesn't support it by deleting the file when
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219 * this handle is closed.
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220 * <p/>
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221 * It is implementation specific whether the directory entry is
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222 * removed immediately or when the handle is closed.
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223 */
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224 public static final int SSH_FXF_ACCESS_DELETE_ON_CLOSE = 0x00000800;
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225 }