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annotate packages/io/fileio/current/src/devfs.cxx @ 172:cd45958b28ff

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Merge from eCos master repository on 2001-07-20-10:24:43-BST
author jlarmour
date Fri, 20 Jul 2001 10:23:16 +0000
parents 6ed91473a1cd
children 9b55e9c69693
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1 //==========================================================================
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2 //
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3 // devfs.cxx
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4 //
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5 // Fileio device filesystem
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): nickg
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35 // Contributors: nickg
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36 // Date: 2000-05-25
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37 // Purpose: Fileio device filesystem
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38 // Description: This file implements a simple filesystem that interfaces
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39 // to the existing device IO subsystem.
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40 //
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41 //
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42 //
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43 //
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44 //####DESCRIPTIONEND####
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45 //
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46 //==========================================================================
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47
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48 #include <pkgconf/hal.h>
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49 #include <pkgconf/kernel.h>
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50 #include <pkgconf/io_fileio.h>
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51
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52 #include <cyg/kernel/ktypes.h> // base kernel types
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53 #include <cyg/infra/cyg_trac.h> // tracing macros
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54 #include <cyg/infra/cyg_ass.h> // assertion macros
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55
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56 #include "fio.h" // Private header
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57
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58 #include <cyg/io/devtab.h> // device subsystem
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59 #include <cyg/io/config_keys.h> // CYG_IO_GET_CONFIG_SERIAL_OUTPUT_DRAIN
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60
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61 //==========================================================================
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62 // Forward definitions
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63
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64 // Filesystem operations
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65 static int dev_mount ( cyg_fstab_entry *fste, cyg_mtab_entry *mte );
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66 static int dev_umount ( cyg_mtab_entry *mte );
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67 static int dev_open ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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68 int mode, cyg_file *fte );
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69 static int dev_unlink ( cyg_mtab_entry *mte, cyg_dir dir, const char *name );
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70 static int dev_mkdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name );
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71 static int dev_rmdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name );
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72 static int dev_rename ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,
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73 cyg_dir dir2, const char *name2 );
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74 static int dev_link ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,
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75 cyg_dir dir2, const char *name2, int type );
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76 static int dev_opendir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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77 cyg_file *fte );
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78 static int dev_chdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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79 cyg_dir *dir_out );
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80 static int dev_stat ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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81 struct stat *buf);
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82 static int dev_getinfo ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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83 int key, void *buf, int len );
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84 static int dev_setinfo ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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85 int key, void *buf, int len );
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86
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87 // File operations
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88 static int dev_fo_read (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio);
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89 static int dev_fo_write (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio);
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90 static int dev_fo_lseek (struct CYG_FILE_TAG *fp, off_t *pos, int whence );
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91 static int dev_fo_ioctl (struct CYG_FILE_TAG *fp, CYG_ADDRWORD com,
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92 CYG_ADDRWORD data);
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93 static int dev_fo_select (struct CYG_FILE_TAG *fp, int which, CYG_ADDRWORD info);
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94 static int dev_fo_fsync (struct CYG_FILE_TAG *fp, int mode );
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95 static int dev_fo_close (struct CYG_FILE_TAG *fp);
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96 static int dev_fo_fstat (struct CYG_FILE_TAG *fp, struct stat *buf );
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97 static int dev_fo_getinfo (struct CYG_FILE_TAG *fp, int key, void *buf, int len );
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98 static int dev_fo_setinfo (struct CYG_FILE_TAG *fp, int key, void *buf, int len );
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99
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100
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101 //==========================================================================
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102 // Filesystem table entries
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103
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104 FSTAB_ENTRY( dev_fste, "devfs", 0,
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105 CYG_SYNCMODE_NONE, // dev system has its own sync mechanism
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106 dev_mount,
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107 dev_umount,
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108 dev_open,
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109 dev_unlink,
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110 dev_mkdir,
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111 dev_rmdir,
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112 dev_rename,
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113 dev_link,
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114 dev_opendir,
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115 dev_chdir,
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116 dev_stat,
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117 dev_getinfo,
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118 dev_setinfo);
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119
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120 MTAB_ENTRY( dev_mte,
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121 "/dev",
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122 "devfs",
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123 "",
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124 0);
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125
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126 static cyg_fileops dev_fileops =
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127 {
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128 dev_fo_read,
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129 dev_fo_write,
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130 dev_fo_lseek,
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131 dev_fo_ioctl,
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132 dev_fo_select,
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133 dev_fo_fsync,
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134 dev_fo_close,
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135 dev_fo_fstat,
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136 dev_fo_getinfo,
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137 dev_fo_setinfo
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138 };
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139
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140 //==========================================================================
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141 // Filesystem operations
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142
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143 // -------------------------------------------------------------------------
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144
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145 static int dev_mount ( cyg_fstab_entry *fste, cyg_mtab_entry *mte )
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146 {
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147 // Nothing to do here. The device IO subsystem has already initialized
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148 // iteslf, and the fileio infrastructure will do the rest.
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149
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150 return 0;
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151 }
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152
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153 // -------------------------------------------------------------------------
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154
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155 static int dev_umount ( cyg_mtab_entry *mte )
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156 {
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157 // Nothing to do here.
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158
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159 return 0;
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160 }
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161
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162 // -------------------------------------------------------------------------
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163
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164 static int dev_open ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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165 int mode, cyg_file *file )
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166 {
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167 Cyg_ErrNo err;
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168 cyg_io_handle_t handle;
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169
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170 // The name we are passed will point to the first character after
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171 // "/dev/". We know that the full string contains the prefix string,
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172 // so we back the pointer up by 5 chars.
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173 // A better approach would be for the device table entries to only
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174 // contain the part of the string after the prefix.
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175
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176 name -= 5;
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177
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178 err = cyg_io_lookup( name, &handle );
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179
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180 if( err < 0 )
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181 return -err;
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182
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183 // If we want non-blocking mode, configure the device for it.
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184 if( (mode & (O_NONBLOCK|O_RDONLY)) == (O_NONBLOCK|O_RDONLY) )
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185 {
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186 cyg_uint32 f = 0;
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187 cyg_uint32 fsize = sizeof(f);
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188 err = cyg_io_set_config( handle, CYG_IO_SET_CONFIG_READ_BLOCKING,
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189 (void *)&f, &fsize);
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190 if( err < 0 )
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191 return -err;
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192 }
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193
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194 if( (mode & (O_NONBLOCK|O_WRONLY)) == (O_NONBLOCK|O_WRONLY) )
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195 {
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196 cyg_uint32 f = 0;
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197 cyg_uint32 fsize = sizeof(f);
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198 err = cyg_io_set_config( handle, CYG_IO_SET_CONFIG_WRITE_BLOCKING,
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199 (void *)&f, &fsize);
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200 if( err < 0 )
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201 return -err;
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202 }
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203
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204 // Initialize the file object
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205
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206 file->f_flag |= mode & CYG_FILE_MODE_MASK;
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207 file->f_type = CYG_FILE_TYPE_FILE;
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208 file->f_ops = &dev_fileops;
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209 file->f_offset = 0;
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210 file->f_data = (CYG_ADDRWORD)handle;
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211 file->f_xops = 0;
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212
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213 return 0;
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214 }
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215
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216 // -------------------------------------------------------------------------
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217
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218 static int dev_unlink ( cyg_mtab_entry *mte, cyg_dir dir, const char *name )
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219 {
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220 return EROFS;
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221 }
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222
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223 // -------------------------------------------------------------------------
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224
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225 static int dev_mkdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name )
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226 {
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227 return EROFS;
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228 }
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229
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230 // -------------------------------------------------------------------------
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231
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232 static int dev_rmdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name )
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233 {
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234 return EROFS;
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235 }
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236
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237 // -------------------------------------------------------------------------
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238
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239 static int dev_rename ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,
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240 cyg_dir dir2, const char *name2 )
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241 {
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242 return EROFS;
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243 }
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244
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245 // -------------------------------------------------------------------------
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246
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247 static int dev_link ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,
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248 cyg_dir dir2, const char *name2, int type )
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249 {
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250 return EROFS;
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251 }
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252
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253 // -------------------------------------------------------------------------
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254
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255 static int dev_opendir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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256 cyg_file *fte )
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257 {
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258 return ENOTDIR;
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259 }
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260
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261 // -------------------------------------------------------------------------
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262
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263 static int dev_chdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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264 cyg_dir *dir_out )
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265 {
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266 return ENOTDIR;
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267 }
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268
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269 // -------------------------------------------------------------------------
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270
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271 static int dev_stat ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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272 struct stat *buf)
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273 {
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274 Cyg_ErrNo err;
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275 cyg_io_handle_t handle;
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276
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277 name -= 5; // See comment in dev_open()
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278
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279 err = cyg_io_lookup( name, &handle );
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280
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281 if( err < 0 )
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282 return -err;
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283
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284 // Just fill in the stat buffer with some constant values.
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285
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286 // FIXME: change this when block devices are available
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287 buf->st_mode = __stat_mode_CHR;
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288
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289 buf->st_ino = (ino_t)handle; // map dev handle to inode
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290 buf->st_dev = (dev_t)handle; // same with dev id
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291 buf->st_nlink = 0;
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292 buf->st_uid = 0;
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293 buf->st_gid = 0;
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294 buf->st_size = 0;
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295 buf->st_atime = 0;
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296 buf->st_mtime = 0;
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297 buf->st_ctime = 0;
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298
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299 return ENOERR;
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300 }
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301
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302 // -------------------------------------------------------------------------
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303
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304 static int dev_getinfo ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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305 int key, void *buf, int len )
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306 {
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307 return ENOSYS;
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308 }
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309
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310 // -------------------------------------------------------------------------
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311
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312 static int dev_setinfo ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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313 int key, void *buf, int len )
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314 {
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315 return ENOSYS;
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316 }
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317
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318 //==========================================================================
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319 // File operations
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320
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321
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322 // -------------------------------------------------------------------------
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323
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324 static int dev_fo_read (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio)
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325 {
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326 Cyg_ErrNo err = 0;
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327 int i;
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328
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329 // Now loop over the iovecs until they are all done, or
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330 // we get an error.
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331 for( i = 0; i < uio->uio_iovcnt; i++ )
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332 {
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333 cyg_iovec *iov = &uio->uio_iov[i];
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334 cyg_uint32 len = iov->iov_len;
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335
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336 err = cyg_io_read( (cyg_io_handle_t)fp->f_data,
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337 iov->iov_base,
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338 &len);
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339
172
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340 if( EAGAIN == err ) // must be in non-blocking mode
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341 {
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342 uio->uio_resid -= len;
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343 return ENOERR;
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344 }
115
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345 if( err < 0 ) break;
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346
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347 uio->uio_resid -= len;
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348 }
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349
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350 return -err;
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351 }
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352
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353 // -------------------------------------------------------------------------
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354
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355 static int dev_fo_write (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio)
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356 {
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357 Cyg_ErrNo err = 0;
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358 int i;
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359
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360 // Now loop over the iovecs until they are all done, or
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361 // we get an error.
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362 for( i = 0; i < uio->uio_iovcnt; i++ )
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363 {
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364 cyg_iovec *iov = &uio->uio_iov[i];
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365 cyg_uint32 len = iov->iov_len;
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366
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367 err = cyg_io_write( (cyg_io_handle_t)fp->f_data,
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368 iov->iov_base,
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369 &len);
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370
172
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371 if( EAGAIN == err ) // must be in non-blocking mode
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372 {
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373 uio->uio_resid -= len;
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374 return ENOERR;
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375 }
115
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376 if( err < 0 ) break;
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377
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378 uio->uio_resid -= len;
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379 }
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380
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381 return -err;
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382 }
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383
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384 // -------------------------------------------------------------------------
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385
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386 static int dev_fo_lseek (struct CYG_FILE_TAG *fp, off_t *pos, int whence )
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387 {
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388 // All current devices have no notion of position. Just return zero
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389 // as the new position.
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390
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391 *pos = 0;
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392
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393 return ENOERR;
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394 }
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395
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396 // -------------------------------------------------------------------------
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397
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398 static int dev_fo_ioctl (struct CYG_FILE_TAG *fp, CYG_ADDRWORD com,
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399 CYG_ADDRWORD data)
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400 {
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401 return ENOSYS;
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402 }
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403
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404 // -------------------------------------------------------------------------
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405
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406 static cyg_bool dev_fo_select (struct CYG_FILE_TAG *fp, int which, CYG_ADDRWORD info)
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407 {
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408 return cyg_io_select( (cyg_io_handle_t)fp->f_data,
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409 which,
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410 info);
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411 }
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412
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413 // -------------------------------------------------------------------------
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414
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415 static int dev_fo_fsync (struct CYG_FILE_TAG *fp, int mode )
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416 {
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417 Cyg_ErrNo err;
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418
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419 err = cyg_io_get_config((cyg_io_handle_t)fp->f_data,
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420 CYG_IO_GET_CONFIG_SERIAL_OUTPUT_DRAIN,
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421 NULL, NULL);
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422
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423 return -err;
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424 }
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425
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426 // -------------------------------------------------------------------------
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427
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428 static int dev_fo_close (struct CYG_FILE_TAG *fp)
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429 {
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430 return ENOERR;
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431 }
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432
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433 // -------------------------------------------------------------------------
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434
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435 static int dev_fo_fstat (struct CYG_FILE_TAG *fp, struct stat *buf )
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436 {
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437 // Just fill in the stat buffer with some constant values.
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438
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439 // FIXME: change this when block devices are available
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440 buf->st_mode = __stat_mode_CHR;
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441
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442 buf->st_ino = (ino_t)fp->f_data; // map dev handle to inode
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443 buf->st_dev = (dev_t)fp->f_data; // same with dev id
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444 buf->st_nlink = 0;
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445 buf->st_uid = 0;
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446 buf->st_gid = 0;
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447 buf->st_size = 0;
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448 buf->st_atime = 0;
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449 buf->st_mtime = 0;
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450 buf->st_ctime = 0;
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451
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452 return ENOERR;
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453 }
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454
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455 // -------------------------------------------------------------------------
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456
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457 static int dev_fo_getinfo (struct CYG_FILE_TAG *fp, int key, void *buf, int len )
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458 {
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459 Cyg_ErrNo err = 0;
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460 cyg_uint32 ll = len;
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461
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462 err = cyg_io_get_config( (cyg_io_handle_t)fp->f_data, key, buf, &ll );
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463
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464 return -err;
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465 }
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466
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467 // -------------------------------------------------------------------------
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468
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469 static int dev_fo_setinfo (struct CYG_FILE_TAG *fp, int key, void *buf, int len )
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470 {
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471 Cyg_ErrNo err = 0;
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472 cyg_uint32 ll = len;
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473
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474 err = cyg_io_set_config( (cyg_io_handle_t)fp->f_data, key, buf, &ll );
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475
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476 return -err;
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477 }
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478
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479 // -------------------------------------------------------------------------
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480 // EOF devfs.cxx