1 | /* |
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2 | * System call and file system interface definition |
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3 | * |
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4 | * General purpose communication channel for RTEMS to allow UNIX/POSIX |
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5 | * system call behavior under RTEMS. Initially this supported only |
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6 | * IO to devices but has since been enhanced to support networking |
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7 | * and support for mounted file systems. |
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8 | * |
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9 | * COPYRIGHT (c) 1989-1999. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.OARcorp.com/rtems/license.html. |
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15 | * |
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16 | * $Id$ |
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17 | */ |
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18 | |
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19 | #ifndef _RTEMS_LIBIO_H |
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20 | #define _RTEMS_LIBIO_H |
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21 | |
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22 | #include <rtems.h> |
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23 | #include <sys/types.h> |
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24 | #include <sys/stat.h> |
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25 | #include <sys/ioctl.h> |
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26 | |
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27 | /* |
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28 | * Define data types which must be constructed using forward references. |
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29 | */ |
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30 | |
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31 | typedef struct rtems_libio_tt rtems_libio_t; |
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32 | |
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33 | struct rtems_filesystem_location_info_tt; |
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34 | typedef struct rtems_filesystem_location_info_tt |
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35 | rtems_filesystem_location_info_t; |
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36 | |
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37 | struct rtems_filesystem_mount_table_entry_tt; |
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38 | typedef struct rtems_filesystem_mount_table_entry_tt |
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39 | rtems_filesystem_mount_table_entry_t; |
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40 | |
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41 | /* |
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42 | * Valid RTEMS file types. |
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43 | */ |
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44 | typedef enum { |
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45 | RTEMS_FILESYSTEM_DIRECTORY, |
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46 | RTEMS_FILESYSTEM_DEVICE, |
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47 | RTEMS_FILESYSTEM_HARD_LINK, |
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48 | RTEMS_FILESYSTEM_SYM_LINK, |
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49 | RTEMS_FILESYSTEM_MEMORY_FILE |
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50 | } rtems_filesystem_node_types_t; |
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51 | |
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52 | /* |
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53 | * File Handler Operations Table |
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54 | */ |
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55 | |
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56 | typedef int (*rtems_filesystem_open_t)( |
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57 | rtems_libio_t *iop, |
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58 | const char *pathname, |
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59 | unsigned32 flag, |
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60 | unsigned32 mode |
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61 | ); |
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62 | |
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63 | typedef int (*rtems_filesystem_close_t)( |
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64 | rtems_libio_t *iop |
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65 | ); |
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66 | |
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67 | typedef int (*rtems_filesystem_read_t)( |
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68 | rtems_libio_t *iop, |
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69 | void *buffer, |
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70 | unsigned32 count |
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71 | ); |
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72 | |
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73 | typedef int (*rtems_filesystem_write_t)( |
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74 | rtems_libio_t *iop, |
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75 | const void *buffer, |
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76 | unsigned32 count |
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77 | ); |
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78 | |
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79 | typedef int (*rtems_filesystem_ioctl_t)( |
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80 | rtems_libio_t *iop, |
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81 | unsigned32 command, |
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82 | void *buffer |
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83 | ); |
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84 | |
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85 | typedef int (*rtems_filesystem_lseek_t)( |
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86 | rtems_libio_t *iop, |
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87 | off_t length, |
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88 | int whence |
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89 | ); |
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90 | |
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91 | typedef int (*rtems_filesystem_fstat_t)( |
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92 | rtems_filesystem_location_info_t *loc, |
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93 | struct stat *buf |
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94 | ); |
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95 | |
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96 | typedef int (*rtems_filesystem_fchmod_t)( |
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97 | rtems_filesystem_location_info_t *loc, |
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98 | mode_t mode |
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99 | ); |
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100 | |
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101 | typedef int (*rtems_filesystem_ftruncate_t)( |
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102 | rtems_libio_t *iop, |
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103 | off_t length |
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104 | ); |
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105 | |
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106 | typedef int (*rtems_filesystem_fpathconf_t)( |
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107 | rtems_libio_t *iop, |
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108 | int name |
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109 | ); |
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110 | |
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111 | typedef int (*rtems_filesystem_fsync_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_fdatasync_t)( |
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116 | rtems_libio_t *iop |
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117 | ); |
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118 | |
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119 | typedef int (*rtems_filesystem_fcntl_t)( |
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120 | int cmd, |
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121 | rtems_libio_t *iop |
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122 | ); |
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123 | |
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124 | typedef int (*rtems_filesystem_rmnod_t)( |
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125 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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126 | ); |
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127 | |
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128 | typedef struct { |
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129 | rtems_filesystem_open_t open; |
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130 | rtems_filesystem_close_t close; |
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131 | rtems_filesystem_read_t read; |
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132 | rtems_filesystem_write_t write; |
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133 | rtems_filesystem_ioctl_t ioctl; |
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134 | rtems_filesystem_lseek_t lseek; |
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135 | rtems_filesystem_fstat_t fstat; |
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136 | rtems_filesystem_fchmod_t fchmod; |
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137 | rtems_filesystem_ftruncate_t ftruncate; |
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138 | rtems_filesystem_fpathconf_t fpathconf; |
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139 | rtems_filesystem_fsync_t fsync; |
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140 | rtems_filesystem_fdatasync_t fdatasync; |
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141 | rtems_filesystem_fcntl_t fcntl; |
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142 | rtems_filesystem_rmnod_t rmnod; |
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143 | } rtems_filesystem_file_handlers_r; |
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144 | |
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145 | /* |
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146 | * File System Operations Table |
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147 | */ |
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148 | |
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149 | /* |
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150 | * XXX |
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151 | * This routine does not allocate any space and rtems_filesystem_freenode_t |
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152 | * is not called by the generic after calling this routine. |
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153 | * ie. node_access does not have to contain valid data when the |
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154 | * routine returns. |
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155 | */ |
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156 | |
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157 | typedef int (*rtems_filesystem_mknod_t)( |
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158 | const char *path, /* IN */ |
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159 | mode_t mode, /* IN */ |
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160 | dev_t dev, /* IN */ |
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161 | rtems_filesystem_location_info_t *pathloc /* IN/OUT */ |
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162 | ); |
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163 | |
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164 | /* |
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165 | * rtems_filesystem_freenode_t must be called by the generic after |
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166 | * calling this routine |
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167 | */ |
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168 | |
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169 | typedef int (*rtems_filesystem_evalpath_t)( |
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170 | const char *pathname, /* IN */ |
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171 | int flags, /* IN */ |
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172 | rtems_filesystem_location_info_t *pathloc /* IN/OUT */ |
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173 | ); |
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174 | |
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175 | typedef int (*rtems_filesystem_evalmake_t)( |
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176 | const char *path, /* IN */ |
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177 | rtems_filesystem_location_info_t *pathloc, /* IN/OUT */ |
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178 | const char **name /* OUT */ |
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179 | ); |
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180 | |
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181 | typedef int (*rtems_filesystem_link_t)( |
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182 | rtems_filesystem_location_info_t *to_loc, /* IN */ |
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183 | rtems_filesystem_location_info_t *parent_loc, /* IN */ |
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184 | const char *name /* IN */ |
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185 | ); |
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186 | |
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187 | typedef int (*rtems_filesystem_unlink_t)( |
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188 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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189 | ); |
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190 | |
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191 | typedef int (*rtems_filesystem_chown_t)( |
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192 | rtems_filesystem_location_info_t *pathloc, /* IN */ |
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193 | uid_t owner, /* IN */ |
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194 | gid_t group /* IN */ |
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195 | ); |
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196 | |
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197 | typedef int (*rtems_filesystem_freenode_t)( |
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198 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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199 | ); |
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200 | |
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201 | typedef int (* rtems_filesystem_mount_t ) ( |
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202 | rtems_filesystem_mount_table_entry_t *mt_entry /* in */ |
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203 | ); |
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204 | |
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205 | typedef int (* rtems_filesystem_fsmount_me_t )( |
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206 | rtems_filesystem_mount_table_entry_t *mt_entry |
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207 | ); |
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208 | |
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209 | typedef int (* rtems_filesystem_unmount_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 int (* rtems_filesystem_fsunmount_me_t ) ( |
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214 | rtems_filesystem_mount_table_entry_t *mt_entry /* in */ |
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215 | ); |
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216 | |
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217 | typedef rtems_filesystem_node_types_t (* rtems_filesystem_node_type_t) ( |
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218 | rtems_filesystem_location_info_t *pathloc /* in */ |
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219 | ); |
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220 | |
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221 | typedef int (* rtems_filesystem_utime_t)( |
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222 | rtems_filesystem_location_info_t *pathloc, /* IN */ |
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223 | time_t actime, /* IN */ |
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224 | time_t modtime /* IN */ |
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225 | ); |
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226 | |
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227 | typedef int (*rtems_filesystem_evaluate_link_t)( |
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228 | rtems_filesystem_location_info_t *pathloc, /* IN/OUT */ |
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229 | int flags /* IN */ |
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230 | ); |
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231 | |
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232 | typedef int (*rtems_filesystem_symlink_t)( |
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233 | rtems_filesystem_location_info_t *loc, /* IN */ |
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234 | const char *link_name, /* IN */ |
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235 | const char *node_name |
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236 | ); |
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237 | |
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238 | typedef int (*rtems_filesystem_readlink_t)( |
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239 | rtems_filesystem_location_info_t *loc, /* IN */ |
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240 | char *buf, /* OUT */ |
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241 | size_t bufsize |
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242 | ); |
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243 | |
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244 | /* |
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245 | * operations table that must be defined for every file system. |
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246 | */ |
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247 | |
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248 | /* |
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249 | * File system types |
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250 | */ |
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251 | typedef struct { |
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252 | rtems_filesystem_evalpath_t evalpath; |
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253 | rtems_filesystem_evalmake_t evalformake; |
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254 | rtems_filesystem_link_t link; |
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255 | rtems_filesystem_unlink_t unlink; |
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256 | rtems_filesystem_node_type_t node_type; |
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257 | rtems_filesystem_mknod_t mknod; |
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258 | rtems_filesystem_chown_t chown; |
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259 | rtems_filesystem_freenode_t freenod; |
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260 | rtems_filesystem_mount_t mount; |
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261 | rtems_filesystem_fsmount_me_t fsmount_me; |
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262 | rtems_filesystem_unmount_t unmount; |
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263 | rtems_filesystem_fsunmount_me_t fsunmount_me; |
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264 | rtems_filesystem_utime_t utime; |
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265 | rtems_filesystem_evaluate_link_t eval_link; |
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266 | rtems_filesystem_symlink_t symlink; |
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267 | rtems_filesystem_readlink_t readlink; |
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268 | } rtems_filesystem_operations_table; |
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269 | |
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270 | #define IMFS_FILE_SYSTEM IMFS_ops |
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271 | extern rtems_filesystem_operations_table IMFS_ops; |
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272 | |
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273 | |
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274 | /* |
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275 | * Structure used to determine a location/filesystem in the tree. |
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276 | */ |
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277 | |
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278 | struct rtems_filesystem_location_info_tt |
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279 | { |
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280 | void *node_access; |
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281 | rtems_filesystem_file_handlers_r *handlers; |
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282 | rtems_filesystem_operations_table *ops; |
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283 | rtems_filesystem_mount_table_entry_t *mt_entry; |
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284 | }; |
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285 | |
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286 | /* |
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287 | * Structure used to contain file system specific information which |
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288 | * is required to support fpathconf(). |
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289 | */ |
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290 | |
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291 | typedef struct { |
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292 | int link_max; |
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293 | int max_canon; |
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294 | int max_input; |
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295 | int name_max; |
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296 | int path_max; |
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297 | int pipe_buf; |
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298 | int posix_async_io; |
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299 | int posix_chown_restrictions; |
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300 | int posix_no_trunc; |
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301 | int posix_prio_io; |
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302 | int posix_sync_io; |
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303 | int posix_vdisable; |
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304 | } rtems_filesystem_limits_and_options_t; |
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305 | |
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306 | /* |
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307 | * Structure for a mount table entry. |
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308 | */ |
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309 | |
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310 | struct rtems_filesystem_mount_table_entry_tt { |
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311 | Chain_Node Node; |
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312 | rtems_filesystem_location_info_t mt_point_node; |
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313 | rtems_filesystem_location_info_t mt_fs_root; |
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314 | int options; |
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315 | void *fs_info; |
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316 | |
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317 | rtems_filesystem_limits_and_options_t pathconf_limits_and_options; |
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318 | |
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319 | /* |
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320 | * When someone adds a mounted filesystem on a real device, |
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321 | * this will need to be used. |
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322 | * |
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323 | * The best option long term for this is probably an open file descriptor. |
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324 | */ |
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325 | char *dev; |
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326 | }; |
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327 | |
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328 | /* |
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329 | * Valid RTEMS file systems options |
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330 | */ |
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331 | |
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332 | typedef enum |
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333 | { |
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334 | RTEMS_FILESYSTEM_READ_ONLY, |
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335 | RTEMS_FILESYSTEM_READ_WRITE, |
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336 | RTEMS_FILESYSTEM_BAD_OPTIONS |
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337 | } rtems_filesystem_options_t; |
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338 | |
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339 | |
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340 | /* |
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341 | * An open file data structure, indexed by 'fd' |
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342 | * TODO: |
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343 | * should really have a separate per/file data structure that this |
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344 | * points to (eg: size, offset, driver, pathname should be in that) |
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345 | */ |
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346 | |
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347 | struct rtems_libio_tt { |
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348 | rtems_driver_name_t *driver; |
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349 | off_t size; /* size of file */ |
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350 | off_t offset; /* current offset into file */ |
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351 | unsigned32 flags; |
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352 | rtems_filesystem_location_info_t pathinfo; |
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353 | Objects_Id sem; |
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354 | unsigned32 data0; /* private to "driver" */ |
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355 | void *data1; /* ... */ |
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356 | void *file_info; /* used by file handlers */ |
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357 | rtems_filesystem_file_handlers_r *handlers; /* type specific handlers */ |
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358 | }; |
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359 | |
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360 | /* |
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361 | * param block for read/write |
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362 | * Note: it must include 'offset' instead of using iop's offset since |
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363 | * we can have multiple outstanding i/o's on a device. |
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364 | */ |
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365 | |
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366 | typedef struct { |
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367 | rtems_libio_t *iop; |
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368 | off_t offset; |
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369 | unsigned8 *buffer; |
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370 | unsigned32 count; |
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371 | unsigned32 flags; |
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372 | unsigned32 bytes_moved; |
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373 | } rtems_libio_rw_args_t; |
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374 | |
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375 | /* |
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376 | * param block for open/close |
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377 | */ |
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378 | |
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379 | typedef struct { |
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380 | rtems_libio_t *iop; |
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381 | unsigned32 flags; |
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382 | unsigned32 mode; |
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383 | } rtems_libio_open_close_args_t; |
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384 | |
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385 | /* |
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386 | * param block for ioctl |
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387 | */ |
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388 | |
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389 | typedef struct { |
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390 | rtems_libio_t *iop; |
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391 | unsigned32 command; |
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392 | void *buffer; |
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393 | unsigned32 ioctl_return; |
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394 | } rtems_libio_ioctl_args_t; |
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395 | |
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396 | /* |
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397 | * Values for 'flag' |
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398 | */ |
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399 | |
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400 | #define LIBIO_FLAGS_NO_DELAY 0x0001 /* return immediately if no data */ |
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401 | #define LIBIO_FLAGS_READ 0x0002 /* reading */ |
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402 | #define LIBIO_FLAGS_WRITE 0x0004 /* writing */ |
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403 | #define LIBIO_FLAGS_OPEN 0x0100 /* device is open */ |
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404 | #define LIBIO_FLAGS_APPEND 0x0200 /* all writes append */ |
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405 | #define LIBIO_FLAGS_CREATE 0x0400 /* create file */ |
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406 | #define LIBIO_FLAGS_CLOSE_ON_EXEC 0x0800 /* close on process exec() */ |
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407 | #define LIBIO_FLAGS_READ_WRITE (LIBIO_FLAGS_READ | LIBIO_FLAGS_WRITE) |
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408 | |
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409 | void rtems_libio_init(void); |
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410 | |
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411 | /* |
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412 | * External I/O handlers |
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413 | */ |
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414 | |
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415 | typedef int (*rtems_libio_open_t)( |
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416 | const char *pathname, |
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417 | unsigned32 flag, |
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418 | unsigned32 mode |
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419 | ); |
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420 | |
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421 | typedef int (*rtems_libio_close_t)( |
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422 | int fd |
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423 | ); |
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424 | |
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425 | typedef int (*rtems_libio_read_t)( |
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426 | int fd, |
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427 | void *buffer, |
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428 | unsigned32 count |
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429 | ); |
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430 | |
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431 | typedef int (*rtems_libio_write_t)( |
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432 | int fd, |
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433 | const void *buffer, |
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434 | unsigned32 count |
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435 | ); |
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436 | |
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437 | typedef int (*rtems_libio_ioctl_t)( |
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438 | int fd, |
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439 | unsigned32 command, |
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440 | void *buffer |
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441 | ); |
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442 | |
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443 | typedef int (*rtems_libio_lseek_t)( |
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444 | int fd, |
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445 | off_t offset, |
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446 | int whence |
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447 | ); |
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448 | |
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449 | /* |
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450 | * The following macros are used to build up the permissions sets |
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451 | * used to check permissions. These are similar in style to the |
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452 | * mode_t bits and should stay compatible with them. |
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453 | */ |
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454 | |
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455 | #define RTEMS_LIBIO_PERMS_READ S_IROTH |
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456 | #define RTEMS_LIBIO_PERMS_WRITE S_IWOTH |
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457 | #define RTEMS_LIBIO_PERMS_RDWR (S_IROTH|S_IWOTH) |
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458 | #define RTEMS_LIBIO_PERMS_EXEC S_IXOTH |
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459 | #define RTEMS_LIBIO_PERMS_SEARCH RTEMS_LIBIO_PERMS_EXEC |
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460 | #define RTEMS_LIBIO_PERMS_RWX S_IRWXO |
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461 | |
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462 | /* |
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463 | * Macros |
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464 | */ |
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465 | |
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466 | #define rtems_filesystem_make_dev_t( _major, _minor ) \ |
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467 | ((((dev_t)(_major)) << 32) | (dev_t)(_minor)) |
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468 | |
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469 | #define rtems_filesystem_split_dev_t( _dev, _major, _minor ) \ |
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470 | do { \ |
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471 | (_major) = (rtems_device_major_number) ((_dev) >> 32); \ |
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472 | (_minor) = (rtems_device_minor_number) ((_dev) & 0xFFFFFFFF); \ |
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473 | } while(0) |
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474 | |
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475 | /* |
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476 | * Verifies that the permission flag is valid. |
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477 | */ |
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478 | #define rtems_libio_is_valid_perms( _perm ) \ |
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479 | (~ ((~RTEMS_LIBIO_PERMS_RWX) & _perm )) |
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480 | |
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481 | |
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482 | /* |
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483 | * Prototypes for filesystem |
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484 | */ |
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485 | |
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486 | void rtems_filesystem_initialize( void ); |
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487 | |
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488 | |
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489 | /* |
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490 | * Callbacks from TERMIOS routines to device-dependent code |
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491 | */ |
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492 | |
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493 | #include <termios.h> |
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494 | |
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495 | typedef struct rtems_termios_callbacks { |
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496 | int (*firstOpen)(int major, int minor, void *arg); |
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497 | int (*lastClose)(int major, int minor, void *arg); |
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498 | int (*pollRead)(int minor); |
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499 | int (*write)(int minor, const char *buf, int len); |
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500 | int (*setAttributes)(int minor, const struct termios *t); |
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501 | int (*stopRemoteTx)(int minor); |
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502 | int (*startRemoteTx)(int minor); |
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503 | int outputUsesInterrupts; |
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504 | } rtems_termios_callbacks; |
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505 | |
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506 | /* |
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507 | * Device-independent TERMIOS routines |
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508 | */ |
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509 | |
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510 | void rtems_termios_initialize (void); |
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511 | |
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512 | rtems_status_code rtems_termios_open ( |
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513 | rtems_device_major_number major, |
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514 | rtems_device_minor_number minor, |
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515 | void *arg, |
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516 | const rtems_termios_callbacks *callbacks |
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517 | ); |
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518 | |
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519 | rtems_status_code rtems_termios_close( |
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520 | void *arg |
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521 | ); |
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522 | |
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523 | rtems_status_code rtems_termios_read( |
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524 | void *arg |
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525 | ); |
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526 | |
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527 | rtems_status_code rtems_termios_write( |
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528 | void *arg |
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529 | ); |
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530 | |
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531 | rtems_status_code rtems_termios_ioctl( |
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532 | void *arg |
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533 | ); |
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534 | |
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535 | int rtems_termios_enqueue_raw_characters( |
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536 | void *ttyp, |
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537 | char *buf, |
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538 | int len |
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539 | ); |
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540 | |
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541 | int rtems_termios_dequeue_characters( |
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542 | void *ttyp, |
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543 | int len |
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544 | ); |
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545 | |
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546 | void rtems_termios_reserve_resources( |
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547 | rtems_configuration_table *configuration, |
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548 | rtems_unsigned32 number_of_devices |
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549 | ); |
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550 | |
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551 | int unmount( |
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552 | const char *mount_path |
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553 | ); |
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554 | |
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555 | int mount( |
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556 | rtems_filesystem_mount_table_entry_t **mt_entry, |
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557 | rtems_filesystem_operations_table *fs_ops, |
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558 | rtems_filesystem_options_t fsoptions, |
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559 | char *device, |
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560 | char *mount_point |
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561 | ); |
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562 | |
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563 | /* |
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564 | * Boot Time Mount Table Structure |
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565 | */ |
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566 | |
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567 | typedef struct { |
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568 | rtems_filesystem_operations_table *fs_ops; |
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569 | rtems_filesystem_options_t fsoptions; |
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570 | char *device; |
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571 | char *mount_point; |
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572 | } rtems_filesystem_mount_table_t; |
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573 | |
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574 | extern rtems_filesystem_mount_table_t *rtems_filesystem_mount_table; |
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575 | extern int rtems_filesystem_mount_table_size; |
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576 | |
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577 | #endif /* _RTEMS_LIBIO_H */ |
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