1 | /** |
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2 | * @file rtems/libio.h |
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3 | */ |
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4 | |
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5 | /* |
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6 | * System call and file system interface definition |
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7 | * |
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8 | * General purpose communication channel for RTEMS to allow UNIX/POSIX |
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9 | * system call behavior under RTEMS. Initially this supported only |
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10 | * IO to devices but has since been enhanced to support networking |
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11 | * and support for mounted file systems. |
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12 | * |
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13 | * COPYRIGHT (c) 1989-1999. |
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14 | * On-Line Applications Research Corporation (OAR). |
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15 | * |
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16 | * The license and distribution terms for this file may be |
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17 | * found in the file LICENSE in this distribution or at |
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18 | * http://www.rtems.com/license/LICENSE. |
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19 | * |
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20 | * $Id$ |
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21 | */ |
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22 | |
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23 | #ifndef _RTEMS_RTEMS_LIBIO_H |
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24 | #define _RTEMS_RTEMS_LIBIO_H |
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25 | |
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26 | #include <rtems.h> |
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27 | #include <sys/types.h> |
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28 | #include <sys/stat.h> |
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29 | #include <sys/ioctl.h> |
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30 | |
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31 | /* |
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32 | * Define data types which must be constructed using forward references. |
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33 | */ |
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34 | |
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35 | #include <rtems/fs.h> |
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36 | |
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37 | /* |
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38 | * Valid RTEMS file types. |
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39 | */ |
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40 | |
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41 | #define RTEMS_FILESYSTEM_DIRECTORY 1 |
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42 | #define RTEMS_FILESYSTEM_DEVICE 2 |
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43 | #define RTEMS_FILESYSTEM_HARD_LINK 3 |
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44 | #define RTEMS_FILESYSTEM_SYM_LINK 4 |
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45 | #define RTEMS_FILESYSTEM_MEMORY_FILE 5 |
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46 | typedef int rtems_filesystem_node_types_t; |
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47 | |
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48 | /* |
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49 | * File Handler Operations Table |
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50 | */ |
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51 | |
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52 | typedef int (*rtems_filesystem_open_t)( |
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53 | rtems_libio_t *iop, |
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54 | const char *pathname, |
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55 | uint32_t flag, |
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56 | uint32_t mode |
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57 | ); |
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58 | |
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59 | typedef int (*rtems_filesystem_close_t)( |
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60 | rtems_libio_t *iop |
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61 | ); |
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62 | |
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63 | typedef ssize_t (*rtems_filesystem_read_t)( |
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64 | rtems_libio_t *iop, |
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65 | void *buffer, |
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66 | uint32_t count |
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67 | ); |
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68 | |
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69 | typedef ssize_t (*rtems_filesystem_write_t)( |
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70 | rtems_libio_t *iop, |
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71 | const void *buffer, |
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72 | uint32_t count |
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73 | ); |
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74 | |
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75 | typedef int (*rtems_filesystem_ioctl_t)( |
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76 | rtems_libio_t *iop, |
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77 | uint32_t command, |
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78 | void *buffer |
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79 | ); |
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80 | |
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81 | typedef int (*rtems_filesystem_lseek_t)( |
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82 | rtems_libio_t *iop, |
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83 | off_t length, |
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84 | int whence |
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85 | ); |
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86 | |
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87 | typedef int (*rtems_filesystem_fstat_t)( |
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88 | rtems_filesystem_location_info_t *loc, |
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89 | struct stat *buf |
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90 | ); |
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91 | |
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92 | typedef int (*rtems_filesystem_fchmod_t)( |
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93 | rtems_filesystem_location_info_t *loc, |
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94 | mode_t mode |
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95 | ); |
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96 | |
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97 | typedef int (*rtems_filesystem_ftruncate_t)( |
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98 | rtems_libio_t *iop, |
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99 | off_t length |
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100 | ); |
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101 | |
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102 | typedef int (*rtems_filesystem_fpathconf_t)( |
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103 | rtems_libio_t *iop, |
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104 | int name |
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105 | ); |
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106 | |
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107 | typedef int (*rtems_filesystem_fsync_t)( |
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108 | rtems_libio_t *iop |
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109 | ); |
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110 | |
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111 | typedef int (*rtems_filesystem_fdatasync_t)( |
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112 | rtems_libio_t *iop |
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113 | ); |
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114 | |
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115 | typedef int (*rtems_filesystem_fcntl_t)( |
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116 | int cmd, |
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117 | rtems_libio_t *iop |
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118 | ); |
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119 | |
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120 | typedef int (*rtems_filesystem_rmnod_t)( |
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121 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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122 | ); |
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123 | |
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124 | struct _rtems_filesystem_file_handlers_r { |
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125 | rtems_filesystem_open_t open_h; |
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126 | rtems_filesystem_close_t close_h; |
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127 | rtems_filesystem_read_t read_h; |
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128 | rtems_filesystem_write_t write_h; |
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129 | rtems_filesystem_ioctl_t ioctl_h; |
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130 | rtems_filesystem_lseek_t lseek_h; |
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131 | rtems_filesystem_fstat_t fstat_h; |
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132 | rtems_filesystem_fchmod_t fchmod_h; |
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133 | rtems_filesystem_ftruncate_t ftruncate_h; |
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134 | rtems_filesystem_fpathconf_t fpathconf_h; |
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135 | rtems_filesystem_fsync_t fsync_h; |
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136 | rtems_filesystem_fdatasync_t fdatasync_h; |
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137 | rtems_filesystem_fcntl_t fcntl_h; |
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138 | rtems_filesystem_rmnod_t rmnod_h; |
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139 | }; |
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140 | |
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141 | /* |
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142 | * File System Operations Table |
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143 | */ |
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144 | |
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145 | /* |
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146 | * XXX |
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147 | * This routine does not allocate any space and rtems_filesystem_freenode_t |
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148 | * is not called by the generic after calling this routine. |
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149 | * ie. node_access does not have to contain valid data when the |
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150 | * routine returns. |
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151 | */ |
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152 | |
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153 | typedef int (*rtems_filesystem_mknod_t)( |
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154 | const char *path, /* IN */ |
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155 | mode_t mode, /* IN */ |
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156 | dev_t dev, /* IN */ |
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157 | rtems_filesystem_location_info_t *pathloc /* IN/OUT */ |
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158 | ); |
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159 | |
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160 | /* |
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161 | * rtems_filesystem_freenode_t must be called by the generic after |
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162 | * calling this routine |
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163 | */ |
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164 | |
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165 | typedef int (*rtems_filesystem_evalpath_t)( |
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166 | const char *pathname, /* IN */ |
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167 | int flags, /* IN */ |
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168 | rtems_filesystem_location_info_t *pathloc /* IN/OUT */ |
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169 | ); |
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170 | |
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171 | typedef int (*rtems_filesystem_evalmake_t)( |
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172 | const char *path, /* IN */ |
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173 | rtems_filesystem_location_info_t *pathloc, /* IN/OUT */ |
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174 | const char **name /* OUT */ |
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175 | ); |
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176 | |
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177 | typedef int (*rtems_filesystem_link_t)( |
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178 | rtems_filesystem_location_info_t *to_loc, /* IN */ |
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179 | rtems_filesystem_location_info_t *parent_loc, /* IN */ |
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180 | const char *name /* IN */ |
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181 | ); |
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182 | |
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183 | typedef int (*rtems_filesystem_unlink_t)( |
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184 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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185 | ); |
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186 | |
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187 | typedef int (*rtems_filesystem_chown_t)( |
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188 | rtems_filesystem_location_info_t *pathloc, /* IN */ |
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189 | uid_t owner, /* IN */ |
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190 | gid_t group /* IN */ |
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191 | ); |
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192 | |
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193 | typedef int (*rtems_filesystem_freenode_t)( |
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194 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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195 | ); |
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196 | |
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197 | typedef int (* rtems_filesystem_mount_t ) ( |
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198 | rtems_filesystem_mount_table_entry_t *mt_entry /* in */ |
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199 | ); |
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200 | |
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201 | typedef int (* rtems_filesystem_fsmount_me_t )( |
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202 | rtems_filesystem_mount_table_entry_t *mt_entry |
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203 | ); |
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204 | |
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205 | typedef int (* rtems_filesystem_unmount_t ) ( |
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206 | rtems_filesystem_mount_table_entry_t *mt_entry /* in */ |
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207 | ); |
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208 | |
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209 | typedef int (* rtems_filesystem_fsunmount_me_t ) ( |
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210 | rtems_filesystem_mount_table_entry_t *mt_entry /* in */ |
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211 | ); |
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212 | |
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213 | typedef rtems_filesystem_node_types_t (* rtems_filesystem_node_type_t) ( |
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214 | rtems_filesystem_location_info_t *pathloc /* in */ |
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215 | ); |
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216 | |
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217 | typedef int (* rtems_filesystem_utime_t)( |
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218 | rtems_filesystem_location_info_t *pathloc, /* IN */ |
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219 | time_t actime, /* IN */ |
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220 | time_t modtime /* IN */ |
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221 | ); |
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222 | |
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223 | typedef int (*rtems_filesystem_evaluate_link_t)( |
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224 | rtems_filesystem_location_info_t *pathloc, /* IN/OUT */ |
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225 | int flags /* IN */ |
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226 | ); |
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227 | |
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228 | typedef int (*rtems_filesystem_symlink_t)( |
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229 | rtems_filesystem_location_info_t *loc, /* IN */ |
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230 | const char *link_name, /* IN */ |
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231 | const char *node_name |
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232 | ); |
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233 | |
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234 | typedef int (*rtems_filesystem_readlink_t)( |
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235 | rtems_filesystem_location_info_t *loc, /* IN */ |
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236 | char *buf, /* OUT */ |
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237 | size_t bufsize |
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238 | ); |
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239 | |
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240 | /* |
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241 | * operations table that must be defined for every file system. |
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242 | */ |
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243 | |
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244 | /* |
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245 | * File system types |
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246 | */ |
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247 | struct _rtems_filesystem_operations_table { |
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248 | rtems_filesystem_evalpath_t evalpath_h; |
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249 | rtems_filesystem_evalmake_t evalformake_h; |
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250 | rtems_filesystem_link_t link_h; |
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251 | rtems_filesystem_unlink_t unlink_h; |
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252 | rtems_filesystem_node_type_t node_type_h; |
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253 | rtems_filesystem_mknod_t mknod_h; |
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254 | rtems_filesystem_chown_t chown_h; |
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255 | rtems_filesystem_freenode_t freenod_h; |
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256 | rtems_filesystem_mount_t mount_h; |
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257 | rtems_filesystem_fsmount_me_t fsmount_me_h; |
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258 | rtems_filesystem_unmount_t unmount_h; |
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259 | rtems_filesystem_fsunmount_me_t fsunmount_me_h; |
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260 | rtems_filesystem_utime_t utime_h; |
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261 | rtems_filesystem_evaluate_link_t eval_link_h; |
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262 | rtems_filesystem_symlink_t symlink_h; |
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263 | rtems_filesystem_readlink_t readlink_h; |
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264 | }; |
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265 | |
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266 | #if 0 |
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267 | /* Now in exec/include/rtems/fs.h */ |
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268 | |
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269 | /* |
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270 | * Structure used to determine a location/filesystem in the tree. |
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271 | */ |
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272 | |
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273 | struct rtems_filesystem_location_info_tt |
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274 | { |
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275 | void *node_access; |
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276 | rtems_filesystem_file_handlers_r *handlers; |
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277 | rtems_filesystem_operations_table *ops; |
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278 | rtems_filesystem_mount_table_entry_t *mt_entry; |
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279 | }; |
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280 | #endif |
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281 | |
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282 | /* |
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283 | * Structure used to contain file system specific information which |
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284 | * is required to support fpathconf(). |
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285 | */ |
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286 | |
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287 | typedef struct { |
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288 | int link_max; |
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289 | int max_canon; |
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290 | int max_input; |
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291 | int name_max; |
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292 | int path_max; |
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293 | int pipe_buf; |
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294 | int posix_async_io; |
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295 | int posix_chown_restrictions; |
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296 | int posix_no_trunc; |
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297 | int posix_prio_io; |
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298 | int posix_sync_io; |
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299 | int posix_vdisable; |
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300 | } rtems_filesystem_limits_and_options_t; |
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301 | |
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302 | /* |
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303 | * Structure for a mount table entry. |
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304 | */ |
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305 | |
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306 | struct rtems_filesystem_mount_table_entry_tt { |
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307 | Chain_Node Node; |
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308 | rtems_filesystem_location_info_t mt_point_node; |
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309 | rtems_filesystem_location_info_t mt_fs_root; |
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310 | int options; |
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311 | void *fs_info; |
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312 | |
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313 | rtems_filesystem_limits_and_options_t pathconf_limits_and_options; |
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314 | |
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315 | /* |
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316 | * When someone adds a mounted filesystem on a real device, |
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317 | * this will need to be used. |
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318 | * |
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319 | * The best option long term for this is probably an open file descriptor. |
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320 | */ |
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321 | char *dev; |
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322 | }; |
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323 | |
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324 | /* |
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325 | * Valid RTEMS file systems options |
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326 | */ |
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327 | |
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328 | typedef enum |
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329 | { |
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330 | RTEMS_FILESYSTEM_READ_ONLY, |
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331 | RTEMS_FILESYSTEM_READ_WRITE, |
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332 | RTEMS_FILESYSTEM_BAD_OPTIONS |
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333 | } rtems_filesystem_options_t; |
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334 | |
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335 | |
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336 | /* |
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337 | * An open file data structure, indexed by 'fd' |
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338 | * TODO: |
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339 | * should really have a separate per/file data structure that this |
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340 | * points to (eg: size, offset, driver, pathname should be in that) |
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341 | */ |
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342 | |
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343 | struct rtems_libio_tt { |
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344 | rtems_driver_name_t *driver; |
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345 | off_t size; /* size of file */ |
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346 | off_t offset; /* current offset into file */ |
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347 | uint32_t flags; |
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348 | rtems_filesystem_location_info_t pathinfo; |
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349 | rtems_id sem; |
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350 | uint32_t data0; /* private to "driver" */ |
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351 | void *data1; /* ... */ |
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352 | void *file_info; /* used by file handlers */ |
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353 | rtems_filesystem_file_handlers_r *handlers; /* type specific handlers */ |
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354 | }; |
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355 | |
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356 | /* |
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357 | * param block for read/write |
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358 | * Note: it must include 'offset' instead of using iop's offset since |
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359 | * we can have multiple outstanding i/o's on a device. |
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360 | */ |
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361 | |
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362 | typedef struct { |
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363 | rtems_libio_t *iop; |
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364 | off_t offset; |
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365 | char *buffer; |
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366 | uint32_t count; |
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367 | uint32_t flags; |
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368 | uint32_t bytes_moved; |
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369 | } rtems_libio_rw_args_t; |
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370 | |
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371 | /* |
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372 | * param block for open/close |
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373 | */ |
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374 | |
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375 | typedef struct { |
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376 | rtems_libio_t *iop; |
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377 | uint32_t flags; |
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378 | uint32_t mode; |
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379 | } rtems_libio_open_close_args_t; |
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380 | |
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381 | /* |
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382 | * param block for ioctl |
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383 | */ |
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384 | |
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385 | typedef struct { |
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386 | rtems_libio_t *iop; |
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387 | uint32_t command; |
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388 | void *buffer; |
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389 | uint32_t ioctl_return; |
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390 | } rtems_libio_ioctl_args_t; |
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391 | |
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392 | /* |
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393 | * Values for 'flag' |
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394 | */ |
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395 | |
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396 | #define LIBIO_FLAGS_NO_DELAY 0x0001 /* return immediately if no data */ |
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397 | #define LIBIO_FLAGS_READ 0x0002 /* reading */ |
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398 | #define LIBIO_FLAGS_WRITE 0x0004 /* writing */ |
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399 | #define LIBIO_FLAGS_OPEN 0x0100 /* device is open */ |
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400 | #define LIBIO_FLAGS_APPEND 0x0200 /* all writes append */ |
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401 | #define LIBIO_FLAGS_CREATE 0x0400 /* create file */ |
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402 | #define LIBIO_FLAGS_CLOSE_ON_EXEC 0x0800 /* close on process exec() */ |
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403 | #define LIBIO_FLAGS_READ_WRITE (LIBIO_FLAGS_READ | LIBIO_FLAGS_WRITE) |
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404 | |
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405 | void rtems_libio_init(void); |
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406 | |
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407 | /* |
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408 | * External I/O handlers |
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409 | */ |
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410 | |
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411 | typedef int (*rtems_libio_open_t)( |
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412 | const char *pathname, |
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413 | uint32_t flag, |
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414 | uint32_t mode |
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415 | ); |
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416 | |
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417 | typedef int (*rtems_libio_close_t)( |
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418 | int fd |
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419 | ); |
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420 | |
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421 | typedef int (*rtems_libio_read_t)( |
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422 | int fd, |
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423 | void *buffer, |
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424 | uint32_t count |
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425 | ); |
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426 | |
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427 | typedef int (*rtems_libio_write_t)( |
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428 | int fd, |
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429 | const void *buffer, |
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430 | uint32_t count |
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431 | ); |
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432 | |
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433 | typedef int (*rtems_libio_ioctl_t)( |
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434 | int fd, |
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435 | uint32_t command, |
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436 | void *buffer |
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437 | ); |
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438 | |
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439 | typedef int (*rtems_libio_lseek_t)( |
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440 | int fd, |
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441 | off_t offset, |
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442 | int whence |
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443 | ); |
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444 | |
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445 | /* |
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446 | * The following macros are used to build up the permissions sets |
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447 | * used to check permissions. These are similar in style to the |
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448 | * mode_t bits and should stay compatible with them. |
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449 | */ |
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450 | |
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451 | #define RTEMS_LIBIO_PERMS_READ S_IROTH |
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452 | #define RTEMS_LIBIO_PERMS_WRITE S_IWOTH |
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453 | #define RTEMS_LIBIO_PERMS_RDWR (S_IROTH|S_IWOTH) |
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454 | #define RTEMS_LIBIO_PERMS_EXEC S_IXOTH |
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455 | #define RTEMS_LIBIO_PERMS_SEARCH RTEMS_LIBIO_PERMS_EXEC |
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456 | #define RTEMS_LIBIO_PERMS_RWX S_IRWXO |
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457 | |
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458 | /* |
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459 | * Macros |
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460 | */ |
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461 | |
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462 | #if 0 |
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463 | #define rtems_filesystem_make_dev_t( _major, _minor ) \ |
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464 | ((((dev_t)(_major)) << 32) | (dev_t)(_minor)) |
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465 | |
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466 | #define rtems_filesystem_dev_major_t( _dev ) \ |
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467 | (rtems_device_major_number) ((_dev) >> 32) |
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468 | |
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469 | #define rtems_filesystem_dev_minor_t( _dev ) \ |
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470 | (rtems_device_minor_number) ((_dev) & 0xFFFFFFFF) |
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471 | #else |
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472 | |
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473 | #include <unistd.h> |
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474 | |
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475 | union __rtems_dev_t { |
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476 | dev_t device; |
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477 | struct { |
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478 | rtems_device_major_number major; |
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479 | rtems_device_minor_number minor; |
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480 | } __overlay; |
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481 | }; |
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482 | |
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483 | static inline dev_t rtems_filesystem_make_dev_t( |
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484 | rtems_device_major_number _major, |
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485 | rtems_device_minor_number _minor |
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486 | ) |
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487 | { |
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488 | union __rtems_dev_t temp; |
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489 | |
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490 | temp.__overlay.major = _major; |
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491 | temp.__overlay.minor = _minor; |
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492 | return temp.device; |
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493 | } |
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494 | |
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495 | static inline rtems_device_major_number rtems_filesystem_dev_major_t( |
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496 | dev_t device |
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497 | ) |
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498 | { |
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499 | union __rtems_dev_t temp; |
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500 | |
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501 | temp.device = device; |
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502 | return temp.__overlay.major; |
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503 | } |
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504 | |
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505 | |
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506 | static inline rtems_device_minor_number rtems_filesystem_dev_minor_t( |
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507 | dev_t device |
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508 | ) |
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509 | { |
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510 | union __rtems_dev_t temp; |
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511 | |
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512 | temp.device = device; |
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513 | return temp.__overlay.minor; |
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514 | } |
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515 | |
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516 | #endif |
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517 | |
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518 | #define rtems_filesystem_split_dev_t( _dev, _major, _minor ) \ |
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519 | do { \ |
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520 | (_major) = rtems_filesystem_dev_major_t ( _dev ); \ |
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521 | (_minor) = rtems_filesystem_dev_minor_t( _dev ); \ |
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522 | } while(0) |
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523 | |
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524 | /* |
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525 | * Verifies that the permission flag is valid. |
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526 | */ |
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527 | #define rtems_libio_is_valid_perms( _perm ) \ |
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528 | (~ ((~RTEMS_LIBIO_PERMS_RWX) & _perm )) |
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529 | |
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530 | |
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531 | /* |
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532 | * Prototypes for filesystem |
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533 | */ |
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534 | |
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535 | void rtems_filesystem_initialize( void ); |
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536 | |
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537 | |
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538 | /* |
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539 | * Callbacks from TERMIOS routines to device-dependent code |
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540 | */ |
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541 | |
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542 | #include <termios.h> |
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543 | |
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544 | typedef struct rtems_termios_callbacks { |
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545 | int (*firstOpen)(int major, int minor, void *arg); |
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546 | int (*lastClose)(int major, int minor, void *arg); |
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547 | int (*pollRead)(int minor); |
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548 | int (*write)(int minor, const char *buf, int len); |
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549 | int (*setAttributes)(int minor, const struct termios *t); |
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550 | int (*stopRemoteTx)(int minor); |
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551 | int (*startRemoteTx)(int minor); |
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552 | int outputUsesInterrupts; |
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553 | } rtems_termios_callbacks; |
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554 | |
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555 | /* |
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556 | * Device-independent TERMIOS routines |
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557 | */ |
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558 | |
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559 | void rtems_termios_initialize (void); |
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560 | |
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561 | /* |
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562 | * CCJ: Change before opening a tty. Newer code from Eric is coming |
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563 | * so extra work to handle an open tty is not worth it. If the tty |
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564 | * is open, close then open it again. |
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565 | */ |
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566 | rtems_status_code rtems_termios_bufsize ( |
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567 | int cbufsize, /* cooked buffer size */ |
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568 | int raw_input, /* raw input buffer size */ |
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569 | int raw_output /* raw output buffer size */ |
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570 | ); |
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571 | |
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572 | rtems_status_code rtems_termios_open ( |
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573 | rtems_device_major_number major, |
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574 | rtems_device_minor_number minor, |
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575 | void *arg, |
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576 | const rtems_termios_callbacks *callbacks |
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577 | ); |
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578 | |
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579 | rtems_status_code rtems_termios_close( |
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580 | void *arg |
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581 | ); |
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582 | |
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583 | rtems_status_code rtems_termios_read( |
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584 | void *arg |
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585 | ); |
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586 | |
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587 | rtems_status_code rtems_termios_write( |
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588 | void *arg |
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589 | ); |
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590 | |
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591 | rtems_status_code rtems_termios_ioctl( |
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592 | void *arg |
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593 | ); |
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594 | |
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595 | int rtems_termios_enqueue_raw_characters( |
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596 | void *ttyp, |
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597 | char *buf, |
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598 | int len |
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599 | ); |
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600 | |
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601 | int rtems_termios_dequeue_characters( |
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602 | void *ttyp, |
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603 | int len |
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604 | ); |
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605 | |
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606 | void rtems_termios_reserve_resources( |
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607 | rtems_configuration_table *configuration, |
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608 | uint32_t number_of_devices |
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609 | ); |
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610 | |
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611 | int unmount( |
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612 | const char *mount_path |
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613 | ); |
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614 | |
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615 | int mount( |
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616 | rtems_filesystem_mount_table_entry_t **mt_entry, |
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617 | rtems_filesystem_operations_table *fs_ops, |
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618 | rtems_filesystem_options_t fsoptions, |
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619 | char *device, |
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620 | char *mount_point |
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621 | ); |
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622 | |
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623 | /* |
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624 | * Boot Time Mount Table Structure |
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625 | */ |
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626 | |
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627 | typedef struct { |
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628 | rtems_filesystem_operations_table *fs_ops; |
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629 | rtems_filesystem_options_t fsoptions; |
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630 | char *device; |
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631 | char *mount_point; |
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632 | } rtems_filesystem_mount_table_t; |
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633 | |
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634 | extern rtems_filesystem_mount_table_t *rtems_filesystem_mount_table; |
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635 | extern int rtems_filesystem_mount_table_size; |
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636 | |
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637 | #endif /* _RTEMS_LIBIO_H */ |
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