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 | #include <sys/fcntl.h> /* O_RDONLY, et.al. */ |
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18 | #if defined(solaris2) |
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19 | #define O_NDELAY O_NONBLOCK |
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20 | #elif defined(RTEMS_NEWLIB) |
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21 | #define O_NDELAY _FNBIO |
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22 | #endif |
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23 | #include <errno.h> |
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24 | #include <string.h> /* strcmp */ |
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25 | #include <unistd.h> |
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26 | #include <stdlib.h> /* calloc() */ |
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27 | |
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28 | #include "libio.h" /* libio.h not pulled in by rtems */ |
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29 | |
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30 | /* |
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31 | * Semaphore to protect the io table |
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32 | */ |
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33 | |
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34 | Objects_Id rtems_libio_semaphore; |
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35 | |
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36 | #define RTEMS_LIBIO_SEM rtems_build_name('L', 'B', 'I', 'O') |
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37 | #define RTEMS_LIBIO_IOP_SEM(n) rtems_build_name('L', 'B', 'I', n) |
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38 | |
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39 | unsigned32 rtems_libio_number_iops; |
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40 | rtems_libio_t *rtems_libio_iops; |
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41 | rtems_libio_t *rtems_libio_last_iop; |
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42 | |
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43 | #define rtems_libio_iop(fd) ((((unsigned32)(fd)) < rtems_libio_number_iops) ? \ |
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44 | &rtems_libio_iops[fd] : 0) |
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45 | |
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46 | #define rtems_libio_check_fd(fd) \ |
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47 | do { \ |
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48 | if ((fd) >= rtems_libio_number_iops) \ |
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49 | { \ |
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50 | errno = EBADF; \ |
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51 | return -1; \ |
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52 | } \ |
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53 | } while (0) |
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54 | |
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55 | #define rtems_libio_check_buffer(buffer) \ |
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56 | do { \ |
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57 | if ((buffer) == 0) \ |
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58 | { \ |
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59 | errno = EINVAL; \ |
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60 | return -1; \ |
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61 | } \ |
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62 | } while (0) |
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63 | |
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64 | #define rtems_libio_check_count(count) \ |
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65 | do { \ |
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66 | if ((count) == 0) \ |
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67 | { \ |
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68 | return 0; \ |
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69 | } \ |
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70 | } while (0) |
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71 | |
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72 | #define rtems_libio_check_permissions(iop, flag) \ |
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73 | do { \ |
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74 | if (((iop)->flags & (flag)) == 0) \ |
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75 | { \ |
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76 | errno = EINVAL; \ |
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77 | return -1; \ |
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78 | } \ |
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79 | } while (0) |
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80 | |
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81 | |
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82 | void |
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83 | rtems_libio_config( |
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84 | rtems_configuration_table *config, |
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85 | unsigned32 max_fds |
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86 | ) |
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87 | { |
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88 | rtems_libio_number_iops = max_fds; |
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89 | |
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90 | /* |
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91 | * tweak config to reflect # of semaphores we will need |
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92 | */ |
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93 | |
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94 | config->maximum_semaphores += 1; /* one for iop table */ |
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95 | config->maximum_semaphores += max_fds; |
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96 | } |
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97 | |
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98 | /* |
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99 | * Called by bsp startup code to init the libio area. |
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100 | */ |
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101 | |
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102 | void |
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103 | rtems_libio_init(void) |
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104 | { |
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105 | rtems_status_code rc; |
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106 | |
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107 | if (rtems_libio_number_iops > 0) |
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108 | { |
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109 | rtems_libio_iops = (rtems_libio_t *) calloc(rtems_libio_number_iops, |
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110 | sizeof(rtems_libio_t)); |
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111 | if (rtems_libio_iops == NULL) |
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112 | rtems_fatal_error_occurred(RTEMS_NO_MEMORY); |
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113 | |
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114 | rtems_libio_last_iop = rtems_libio_iops + (rtems_libio_number_iops - 1); |
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115 | } |
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116 | |
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117 | rc = rtems_semaphore_create( |
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118 | RTEMS_LIBIO_SEM, |
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119 | 1, |
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120 | RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
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121 | RTEMS_NO_PRIORITY, |
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122 | &rtems_libio_semaphore |
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123 | ); |
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124 | if (rc != RTEMS_SUCCESSFUL) |
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125 | rtems_fatal_error_occurred(rc); |
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126 | } |
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127 | |
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128 | /* |
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129 | * Convert RTEMS status to a UNIX errno |
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130 | */ |
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131 | |
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132 | rtems_assoc_t errno_assoc[] = { |
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133 | { "OK", RTEMS_SUCCESSFUL, 0 }, |
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134 | { "TIMEOUT", RTEMS_TIMEOUT, ETIME }, |
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135 | { "NO MEMORY", RTEMS_NO_MEMORY, ENOMEM }, |
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136 | { 0, 0, 0 }, |
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137 | }; |
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138 | |
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139 | static unsigned32 |
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140 | rtems_libio_errno(rtems_status_code code) |
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141 | { |
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142 | int rc; |
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143 | |
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144 | if ((rc = rtems_assoc_remote_by_local(errno_assoc, (unsigned32) code))) |
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145 | { |
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146 | errno = rc; |
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147 | return -1; |
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148 | } |
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149 | return 0; |
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150 | } |
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151 | |
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152 | /* |
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153 | * Convert UNIX fnctl(2) flags to ones that RTEMS drivers understand |
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154 | */ |
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155 | |
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156 | rtems_assoc_t access_modes_assoc[] = { |
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157 | { "READ", LIBIO_FLAGS_READ, O_RDONLY }, |
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158 | { "WRITE", LIBIO_FLAGS_WRITE, O_WRONLY }, |
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159 | { "READ/WRITE", LIBIO_FLAGS_READ_WRITE, O_RDWR }, |
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160 | { 0, 0, 0 }, |
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161 | }; |
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162 | |
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163 | rtems_assoc_t status_flags_assoc[] = { |
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164 | { "NO DELAY", LIBIO_FLAGS_NO_DELAY, O_NDELAY }, |
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165 | { "APPEND", LIBIO_FLAGS_APPEND, O_APPEND }, |
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166 | { "CREATE", LIBIO_FLAGS_CREATE, O_CREAT }, |
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167 | { 0, 0, 0 }, |
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168 | }; |
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169 | |
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170 | static unsigned32 |
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171 | rtems_libio_fcntl_flags(unsigned32 fcntl_flags) |
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172 | { |
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173 | unsigned32 flags = 0; |
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174 | unsigned32 access_modes; |
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175 | |
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176 | /* |
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177 | * Access mode is a small integer |
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178 | */ |
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179 | |
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180 | access_modes = fcntl_flags & O_ACCMODE; |
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181 | fcntl_flags &= ~O_ACCMODE; |
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182 | flags = rtems_assoc_local_by_remote(access_modes_assoc, access_modes); |
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183 | |
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184 | /* |
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185 | * Everything else is single bits |
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186 | */ |
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187 | |
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188 | flags |= rtems_assoc_local_by_remote_bitfield(status_flags_assoc, fcntl_flags); |
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189 | return flags; |
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190 | } |
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191 | |
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192 | |
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193 | static rtems_libio_t * |
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194 | rtems_libio_allocate(void) |
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195 | { |
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196 | rtems_libio_t *iop; |
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197 | rtems_status_code rc; |
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198 | |
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199 | rtems_semaphore_obtain(rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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200 | |
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201 | for (iop = rtems_libio_iops; iop <= rtems_libio_last_iop; iop++) |
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202 | if ((iop->flags & LIBIO_FLAGS_OPEN) == 0) |
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203 | { |
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204 | /* |
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205 | * Got one; create a semaphore for it |
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206 | */ |
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207 | |
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208 | rc = rtems_semaphore_create( |
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209 | RTEMS_LIBIO_IOP_SEM(iop - rtems_libio_iops), |
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210 | 1, |
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211 | RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
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212 | RTEMS_NO_PRIORITY, |
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213 | &iop->sem |
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214 | ); |
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215 | if (rc != RTEMS_SUCCESSFUL) |
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216 | goto failed; |
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217 | |
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218 | iop->flags = LIBIO_FLAGS_OPEN; |
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219 | goto done; |
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220 | } |
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221 | |
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222 | failed: |
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223 | iop = 0; |
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224 | |
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225 | done: |
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226 | rtems_semaphore_release(rtems_libio_semaphore); |
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227 | return iop; |
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228 | } |
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229 | |
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230 | static void |
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231 | rtems_libio_free(rtems_libio_t *iop) |
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232 | { |
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233 | rtems_semaphore_obtain(rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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234 | |
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235 | if (iop->sem) |
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236 | rtems_semaphore_delete(iop->sem); |
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237 | (void) memset(iop, 0, sizeof(*iop)); |
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238 | |
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239 | rtems_semaphore_release(rtems_libio_semaphore); |
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240 | } |
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241 | |
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242 | int |
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243 | __open( |
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244 | const char *pathname, |
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245 | unsigned32 flag, |
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246 | unsigned32 mode) |
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247 | { |
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248 | rtems_status_code rc; |
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249 | rtems_libio_t *iop = 0; |
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250 | rtems_driver_name_t *np; |
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251 | rtems_libio_open_close_args_t args; |
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252 | |
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253 | if ((rc = rtems_io_lookup_name(pathname, &np)) != RTEMS_SUCCESSFUL) |
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254 | goto done; |
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255 | |
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256 | iop = rtems_libio_allocate(); |
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257 | if (iop == 0) |
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258 | { |
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259 | rc = RTEMS_TOO_MANY; |
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260 | goto done; |
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261 | } |
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262 | |
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263 | iop->driver = np; |
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264 | iop->pathname = (char *) pathname; |
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265 | iop->flags |= rtems_libio_fcntl_flags(flag); |
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266 | |
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267 | args.iop = iop; |
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268 | args.flags = iop->flags; |
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269 | args.mode = mode; |
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270 | |
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271 | rc = rtems_io_open(np->major, np->minor, (void *) &args); |
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272 | |
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273 | done: |
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274 | if (rc != RTEMS_SUCCESSFUL) |
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275 | { |
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276 | if (iop) |
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277 | rtems_libio_free(iop); |
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278 | return rtems_libio_errno(rc); |
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279 | } |
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280 | |
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281 | return iop - rtems_libio_iops; |
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282 | } |
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283 | |
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284 | int |
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285 | __close( |
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286 | int fd |
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287 | ) |
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288 | { |
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289 | rtems_status_code rc; |
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290 | rtems_driver_name_t *np; |
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291 | rtems_libio_t *iop = rtems_libio_iop(fd); |
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292 | rtems_libio_open_close_args_t args; |
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293 | |
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294 | rtems_libio_check_fd(fd); |
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295 | |
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296 | np = iop->driver; |
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297 | |
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298 | args.iop = iop; |
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299 | args.flags = 0; |
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300 | args.mode = 0; |
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301 | |
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302 | rc = rtems_io_close(np->major, np->minor, (void *) &args); |
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303 | |
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304 | if (rc != RTEMS_SUCCESSFUL) |
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305 | return rtems_libio_errno(rc); |
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306 | return 0; |
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307 | } |
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308 | |
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309 | int |
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310 | __read( |
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311 | int fd, |
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312 | void * buffer, |
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313 | unsigned32 count |
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314 | ) |
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315 | { |
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316 | rtems_status_code rc; |
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317 | rtems_driver_name_t *np; |
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318 | rtems_libio_t *iop = rtems_libio_iop(fd); |
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319 | rtems_libio_rw_args_t args; |
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320 | |
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321 | rtems_libio_check_fd(fd); |
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322 | rtems_libio_check_buffer(buffer); |
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323 | rtems_libio_check_count(count); |
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324 | rtems_libio_check_permissions(iop, LIBIO_FLAGS_READ); |
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325 | |
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326 | np = iop->driver; |
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327 | |
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328 | args.iop = iop; |
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329 | args.offset = iop->offset; |
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330 | args.buffer = buffer; |
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331 | args.count = count; |
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332 | args.flags = iop->flags; |
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333 | args.bytes_moved = 0; |
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334 | |
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335 | rc = rtems_io_read(np->major, np->minor, (void *) &args); |
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336 | |
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337 | iop->offset += args.bytes_moved; |
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338 | |
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339 | if (rc != RTEMS_SUCCESSFUL) |
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340 | return rtems_libio_errno(rc); |
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341 | |
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342 | return args.bytes_moved; |
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343 | } |
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344 | |
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345 | int |
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346 | __write( |
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347 | int fd, |
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348 | const void *buffer, |
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349 | unsigned32 count |
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350 | ) |
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351 | { |
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352 | rtems_status_code rc; |
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353 | rtems_driver_name_t *np; |
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354 | rtems_libio_t *iop = rtems_libio_iop(fd); |
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355 | rtems_libio_rw_args_t args; |
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356 | |
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357 | rtems_libio_check_fd(fd); |
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358 | rtems_libio_check_buffer(buffer); |
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359 | rtems_libio_check_count(count); |
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360 | rtems_libio_check_permissions(iop, LIBIO_FLAGS_WRITE); |
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361 | |
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362 | np = iop->driver; |
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363 | |
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364 | args.iop = iop; |
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365 | args.offset = iop->offset; |
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366 | args.buffer = (void *) buffer; |
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367 | args.count = count; |
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368 | args.flags = iop->flags; |
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369 | args.bytes_moved = 0; |
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370 | |
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371 | rc = rtems_io_write(np->major, np->minor, (void *) &args); |
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372 | |
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373 | iop->offset += args.bytes_moved; |
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374 | |
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375 | if (rc != RTEMS_SUCCESSFUL) |
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376 | return rtems_libio_errno(rc); |
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377 | |
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378 | return args.bytes_moved; |
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379 | } |
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380 | |
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381 | int |
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382 | __ioctl( |
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383 | int fd, |
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384 | unsigned32 command, |
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385 | void * buffer) |
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386 | { |
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387 | rtems_status_code rc; |
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388 | rtems_driver_name_t *np; |
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389 | rtems_libio_t *iop = rtems_libio_iop(fd); |
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390 | rtems_libio_ioctl_args_t args; |
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391 | |
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392 | rtems_libio_check_fd(fd); |
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393 | |
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394 | np = iop->driver; |
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395 | |
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396 | args.iop = iop; |
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397 | args.command = command; |
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398 | args.buffer = buffer; |
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399 | |
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400 | rc = rtems_io_control(np->major, np->minor, (void *) &args); |
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401 | |
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402 | if (rc != RTEMS_SUCCESSFUL) |
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403 | return rtems_libio_errno(rc); |
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404 | |
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405 | return args.ioctl_return; |
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406 | } |
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407 | |
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408 | /* |
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409 | * internal only?? |
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410 | */ |
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411 | |
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412 | |
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413 | int |
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414 | __lseek( |
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415 | int fd, |
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416 | rtems_libio_offset_t offset, |
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417 | int whence |
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418 | ) |
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419 | { |
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420 | rtems_libio_t *iop = rtems_libio_iop(fd); |
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421 | |
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422 | rtems_libio_check_fd(fd); |
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423 | |
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424 | switch (whence) |
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425 | { |
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426 | case SEEK_SET: |
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427 | iop->offset = offset; |
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428 | break; |
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429 | |
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430 | case SEEK_CUR: |
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431 | iop->offset += offset; |
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432 | break; |
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433 | |
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434 | case SEEK_END: |
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435 | iop->offset = iop->size - offset; |
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436 | break; |
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437 | |
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438 | default: |
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439 | errno = EINVAL; |
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440 | return -1; |
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441 | } |
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442 | return 0; |
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443 | } |
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