1 | /* |
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2 | * @(#)libio.c 1.1 - 95/06/02 |
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3 | * |
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4 | * |
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5 | * Provide UNIX/POSIX-like io system calls for RTEMS using the |
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6 | * RTEMS IO manager |
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7 | * |
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8 | * TODO |
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9 | * |
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10 | * $Id$ |
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11 | */ |
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12 | |
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13 | #include <rtems.h> |
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14 | #include <rtems/assoc.h> /* assoc.h not included by rtems.h */ |
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15 | |
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16 | #include <fcntl.h> /* O_RDONLY, et.al. */ |
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17 | #if defined(solaris2) |
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18 | #define O_NDELAY O_NONBLOCK |
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19 | #endif |
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20 | #include <errno.h> |
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21 | #include <string.h> /* strcmp */ |
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22 | #include <unistd.h> |
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23 | #include <stdlib.h> /* calloc() */ |
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24 | |
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25 | #include "libio.h" /* libio.h not pulled in by rtems */ |
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26 | |
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27 | /* |
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28 | * Semaphore to protect the io table |
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29 | */ |
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30 | |
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31 | Objects_Id rtems_libio_semaphore; |
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32 | |
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33 | #define RTEMS_LIBIO_SEM rtems_build_name('L', 'B', 'I', 'O') |
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34 | #define RTEMS_LIBIO_IOP_SEM(n) rtems_build_name('L', 'B', 'I', n) |
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35 | |
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36 | unsigned32 rtems_libio_number_iops; |
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37 | rtems_libio_t *rtems_libio_iops; |
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38 | rtems_libio_t *rtems_libio_last_iop; |
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39 | |
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40 | #define rtems_libio_iop(fd) ((((unsigned32)(fd)) < rtems_libio_number_iops) ? \ |
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41 | &rtems_libio_iops[fd] : 0) |
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42 | |
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43 | #define rtems_libio_check_fd(fd) \ |
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44 | do { \ |
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45 | if ((fd) >= rtems_libio_number_iops) \ |
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46 | { \ |
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47 | errno = EBADF; \ |
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48 | return -1; \ |
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49 | } \ |
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50 | } while (0) |
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51 | |
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52 | #define rtems_libio_check_buffer(buffer) \ |
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53 | do { \ |
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54 | if ((buffer) == 0) \ |
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55 | { \ |
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56 | errno = EINVAL; \ |
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57 | return -1; \ |
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58 | } \ |
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59 | } while (0) |
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60 | |
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61 | #define rtems_libio_check_count(count) \ |
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62 | do { \ |
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63 | if ((count) == 0) \ |
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64 | { \ |
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65 | return 0; \ |
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66 | } \ |
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67 | } while (0) |
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68 | |
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69 | #define rtems_libio_check_permissions(iop, flag) \ |
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70 | do { \ |
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71 | if (((iop)->flags & (flag)) == 0) \ |
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72 | { \ |
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73 | errno = EINVAL; \ |
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74 | return -1; \ |
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75 | } \ |
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76 | } while (0) |
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77 | |
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78 | |
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79 | void |
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80 | rtems_libio_config( |
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81 | rtems_configuration_table *config, |
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82 | unsigned32 max_fds |
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83 | ) |
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84 | { |
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85 | rtems_libio_number_iops = max_fds; |
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86 | |
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87 | /* |
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88 | * tweak config to reflect # of semaphores we will need |
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89 | */ |
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90 | |
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91 | config->maximum_semaphores += 1; /* one for iop table */ |
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92 | config->maximum_semaphores += max_fds; |
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93 | } |
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94 | |
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95 | /* |
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96 | * Called by bsp startup code to init the libio area. |
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97 | */ |
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98 | |
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99 | void |
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100 | rtems_libio_init(void) |
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101 | { |
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102 | rtems_status_code rc; |
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103 | |
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104 | if (rtems_libio_number_iops > 0) |
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105 | { |
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106 | rtems_libio_iops = (rtems_libio_t *) calloc(rtems_libio_number_iops, |
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107 | sizeof(rtems_libio_t)); |
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108 | if (rtems_libio_iops == NULL) |
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109 | rtems_fatal_error_occurred(RTEMS_NO_MEMORY); |
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110 | |
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111 | rtems_libio_last_iop = rtems_libio_iops + (rtems_libio_number_iops - 1); |
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112 | } |
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113 | |
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114 | rc = rtems_semaphore_create(RTEMS_LIBIO_SEM, |
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115 | 1, |
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116 | RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
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117 | &rtems_libio_semaphore); |
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118 | if (rc != RTEMS_SUCCESSFUL) |
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119 | rtems_fatal_error_occurred(rc); |
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120 | } |
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121 | |
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122 | /* |
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123 | * Convert RTEMS status to a UNIX errno |
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124 | */ |
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125 | |
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126 | rtems_assoc_t errno_assoc[] = { |
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127 | { "OK", RTEMS_SUCCESSFUL, 0 }, |
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128 | { "TIMEOUT", RTEMS_TIMEOUT, ETIME }, |
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129 | { "NO MEMORY", RTEMS_NO_MEMORY, ENOMEM }, |
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130 | { 0, 0, 0 }, |
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131 | }; |
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132 | |
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133 | static unsigned32 |
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134 | rtems_libio_errno(rtems_status_code code) |
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135 | { |
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136 | int rc; |
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137 | |
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138 | if ((rc = rtems_assoc_remote_by_local(errno_assoc, (unsigned32) code))) |
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139 | { |
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140 | errno = rc; |
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141 | return -1; |
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142 | } |
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143 | return 0; |
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144 | } |
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145 | |
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146 | /* |
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147 | * Convert UNIX fnctl(2) flags to ones that RTEMS drivers understand |
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148 | */ |
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149 | |
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150 | rtems_assoc_t access_modes_assoc[] = { |
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151 | { "READ", LIBIO_FLAGS_READ, O_RDONLY }, |
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152 | { "WRITE", LIBIO_FLAGS_WRITE, O_WRONLY }, |
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153 | { "READ/WRITE", LIBIO_FLAGS_READ_WRITE, O_RDWR }, |
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154 | { 0, 0, 0 }, |
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155 | }; |
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156 | |
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157 | rtems_assoc_t status_flags_assoc[] = { |
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158 | { "NO DELAY", LIBIO_FLAGS_NO_DELAY, O_NDELAY }, |
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159 | { "APPEND", LIBIO_FLAGS_APPEND, O_APPEND }, |
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160 | { "CREATE", LIBIO_FLAGS_CREATE, O_CREAT }, |
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161 | { 0, 0, 0 }, |
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162 | }; |
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163 | |
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164 | static unsigned32 |
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165 | rtems_libio_fcntl_flags(unsigned32 fcntl_flags) |
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166 | { |
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167 | unsigned32 flags = 0; |
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168 | unsigned32 access_modes; |
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169 | |
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170 | /* |
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171 | * Access mode is a small integer |
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172 | */ |
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173 | |
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174 | access_modes = fcntl_flags & O_ACCMODE; |
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175 | fcntl_flags &= ~O_ACCMODE; |
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176 | flags = rtems_assoc_local_by_remote(access_modes_assoc, access_modes); |
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177 | |
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178 | /* |
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179 | * Everything else is single bits |
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180 | */ |
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181 | |
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182 | flags |= rtems_assoc_local_by_remote_bitfield(status_flags_assoc, fcntl_flags); |
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183 | return flags; |
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184 | } |
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185 | |
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186 | |
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187 | static rtems_libio_t * |
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188 | rtems_libio_allocate(void) |
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189 | { |
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190 | rtems_libio_t *iop; |
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191 | rtems_status_code rc; |
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192 | |
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193 | rtems_semaphore_obtain(rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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194 | |
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195 | for (iop = rtems_libio_iops; iop <= rtems_libio_last_iop; iop++) |
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196 | if ((iop->flags & LIBIO_FLAGS_OPEN) == 0) |
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197 | { |
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198 | /* |
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199 | * Got one; create a semaphore for it |
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200 | */ |
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201 | |
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202 | rc = rtems_semaphore_create(RTEMS_LIBIO_IOP_SEM(iop - rtems_libio_iops), |
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203 | 1, RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
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204 | &iop->sem); |
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205 | if (rc != RTEMS_SUCCESSFUL) |
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206 | goto failed; |
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207 | |
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208 | iop->flags = LIBIO_FLAGS_OPEN; |
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209 | goto done; |
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210 | } |
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211 | |
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212 | failed: |
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213 | iop = 0; |
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214 | |
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215 | done: |
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216 | rtems_semaphore_release(rtems_libio_semaphore); |
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217 | return iop; |
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218 | } |
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219 | |
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220 | static void |
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221 | rtems_libio_free(rtems_libio_t *iop) |
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222 | { |
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223 | rtems_semaphore_obtain(rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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224 | |
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225 | if (iop->sem) |
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226 | rtems_semaphore_delete(iop->sem); |
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227 | (void) memset(iop, 0, sizeof(*iop)); |
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228 | |
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229 | rtems_semaphore_release(rtems_libio_semaphore); |
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230 | } |
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231 | |
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232 | int |
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233 | __open( |
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234 | const char *pathname, |
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235 | unsigned32 flag, |
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236 | unsigned32 mode) |
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237 | { |
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238 | rtems_status_code rc; |
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239 | rtems_libio_t *iop = 0; |
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240 | rtems_driver_name_t *np; |
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241 | rtems_libio_open_close_args_t args; |
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242 | |
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243 | if ((rc = rtems_io_lookup_name(pathname, &np)) != RTEMS_SUCCESSFUL) |
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244 | goto done; |
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245 | |
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246 | iop = rtems_libio_allocate(); |
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247 | if (iop == 0) |
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248 | { |
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249 | rc = RTEMS_TOO_MANY; |
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250 | goto done; |
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251 | } |
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252 | |
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253 | iop->driver = np; |
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254 | iop->pathname = (char *) pathname; |
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255 | iop->flags |= rtems_libio_fcntl_flags(flag); |
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256 | |
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257 | args.iop = iop; |
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258 | args.flags = iop->flags; |
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259 | args.mode = mode; |
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260 | |
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261 | rc = rtems_io_open(np->major, np->minor, (void *) &args); |
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262 | |
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263 | done: |
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264 | if (rc != RTEMS_SUCCESSFUL) |
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265 | { |
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266 | if (iop) |
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267 | rtems_libio_free(iop); |
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268 | return rtems_libio_errno(rc); |
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269 | } |
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270 | |
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271 | return iop - rtems_libio_iops; |
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272 | } |
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273 | |
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274 | int |
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275 | __close( |
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276 | int fd |
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277 | ) |
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278 | { |
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279 | rtems_status_code rc; |
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280 | rtems_driver_name_t *np; |
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281 | rtems_libio_t *iop = rtems_libio_iop(fd); |
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282 | rtems_libio_open_close_args_t args; |
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283 | |
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284 | rtems_libio_check_fd(fd); |
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285 | |
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286 | np = iop->driver; |
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287 | |
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288 | args.iop = iop; |
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289 | args.flags = 0; |
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290 | args.mode = 0; |
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291 | |
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292 | rc = rtems_io_close(np->major, np->minor, (void *) &args); |
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293 | |
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294 | if (rc != RTEMS_SUCCESSFUL) |
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295 | return rtems_libio_errno(rc); |
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296 | return 0; |
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297 | } |
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298 | |
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299 | int |
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300 | __read( |
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301 | int fd, |
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302 | void * buffer, |
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303 | unsigned32 count |
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304 | ) |
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305 | { |
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306 | rtems_status_code rc; |
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307 | rtems_driver_name_t *np; |
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308 | rtems_libio_t *iop = rtems_libio_iop(fd); |
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309 | rtems_libio_rw_args_t args; |
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310 | |
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311 | rtems_libio_check_fd(fd); |
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312 | rtems_libio_check_buffer(buffer); |
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313 | rtems_libio_check_count(count); |
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314 | rtems_libio_check_permissions(iop, LIBIO_FLAGS_READ); |
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315 | |
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316 | np = iop->driver; |
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317 | |
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318 | args.iop = iop; |
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319 | args.offset = iop->offset; |
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320 | args.buffer = buffer; |
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321 | args.count = count; |
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322 | args.flags = iop->flags; |
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323 | args.bytes_moved = 0; |
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324 | |
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325 | rc = rtems_io_read(np->major, np->minor, (void *) &args); |
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326 | |
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327 | iop->offset += args.bytes_moved; |
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328 | |
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329 | if (rc != RTEMS_SUCCESSFUL) |
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330 | return rtems_libio_errno(rc); |
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331 | |
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332 | return args.bytes_moved; |
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333 | } |
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334 | |
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335 | int |
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336 | __write( |
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337 | int fd, |
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338 | const void *buffer, |
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339 | unsigned32 count |
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340 | ) |
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341 | { |
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342 | rtems_status_code rc; |
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343 | rtems_driver_name_t *np; |
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344 | rtems_libio_t *iop = rtems_libio_iop(fd); |
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345 | rtems_libio_rw_args_t args; |
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346 | |
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347 | rtems_libio_check_fd(fd); |
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348 | rtems_libio_check_buffer(buffer); |
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349 | rtems_libio_check_count(count); |
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350 | rtems_libio_check_permissions(iop, LIBIO_FLAGS_WRITE); |
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351 | |
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352 | np = iop->driver; |
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353 | |
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354 | args.iop = iop; |
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355 | args.offset = iop->offset; |
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356 | args.buffer = (void *) buffer; |
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357 | args.count = count; |
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358 | args.flags = iop->flags; |
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359 | args.bytes_moved = 0; |
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360 | |
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361 | rc = rtems_io_write(np->major, np->minor, (void *) &args); |
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362 | |
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363 | iop->offset += args.bytes_moved; |
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364 | |
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365 | if (rc != RTEMS_SUCCESSFUL) |
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366 | return rtems_libio_errno(rc); |
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367 | |
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368 | return args.bytes_moved; |
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369 | } |
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370 | |
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371 | int |
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372 | __ioctl( |
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373 | int fd, |
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374 | unsigned32 command, |
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375 | void * buffer) |
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376 | { |
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377 | rtems_status_code rc; |
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378 | rtems_driver_name_t *np; |
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379 | rtems_libio_t *iop = rtems_libio_iop(fd); |
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380 | rtems_libio_ioctl_args_t args; |
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381 | |
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382 | rtems_libio_check_fd(fd); |
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383 | |
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384 | np = iop->driver; |
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385 | |
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386 | args.iop = iop; |
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387 | args.command = command; |
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388 | args.buffer = buffer; |
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389 | |
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390 | rc = rtems_io_control(np->major, np->minor, (void *) &args); |
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391 | |
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392 | if (rc != RTEMS_SUCCESSFUL) |
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393 | return rtems_libio_errno(rc); |
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394 | |
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395 | return args.ioctl_return; |
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396 | } |
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397 | |
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398 | /* |
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399 | * internal only?? |
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400 | */ |
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401 | |
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402 | |
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403 | int |
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404 | __lseek( |
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405 | int fd, |
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406 | rtems_libio_offset_t offset, |
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407 | int whence |
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408 | ) |
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409 | { |
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410 | rtems_libio_t *iop = rtems_libio_iop(fd); |
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411 | |
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412 | rtems_libio_check_fd(fd); |
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413 | |
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414 | switch (whence) |
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415 | { |
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416 | case SEEK_SET: |
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417 | iop->offset = offset; |
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418 | break; |
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419 | |
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420 | case SEEK_CUR: |
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421 | iop->offset += offset; |
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422 | break; |
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423 | |
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424 | case SEEK_END: |
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425 | iop->offset = iop->size - offset; |
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426 | break; |
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427 | |
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428 | default: |
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429 | errno = EINVAL; |
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430 | return -1; |
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431 | } |
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432 | return 0; |
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433 | } |
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