1 | /* |
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2 | * This file contains the support infrastructure used to manage the |
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3 | * table of integer style file descriptors used by the low level |
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4 | * POSIX system calls like open(), read, fstat(), etc. |
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5 | * |
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6 | * COPYRIGHT (c) 1989-1999. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.rtems.com/license/LICENSE. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #if HAVE_CONFIG_H |
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17 | #include "config.h" |
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18 | #endif |
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19 | |
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20 | #include <rtems/libio_.h> /* libio_.h pulls in rtems */ |
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21 | #include <rtems.h> |
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22 | #include <rtems/assoc.h> /* assoc.h not included by rtems.h */ |
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23 | |
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24 | #include <stdio.h> /* O_RDONLY, et.al. */ |
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25 | #include <fcntl.h> /* O_RDONLY, et.al. */ |
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26 | #include <assert.h> |
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27 | #include <errno.h> |
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28 | |
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29 | /* define this to alias O_NDELAY to O_NONBLOCK, i.e., |
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30 | * O_NDELAY is accepted on input but fcntl(F_GETFL) returns |
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31 | * O_NONBLOCK. This is because rtems has no distinction |
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32 | * between the two (but some systems have). |
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33 | * Note that accepting this alias creates a problem: |
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34 | * an application trying to clear the non-blocking flag |
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35 | * using a |
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36 | * |
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37 | * fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) & ~O_NDELAY); |
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38 | * |
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39 | * does (silently) ignore the operation. |
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40 | */ |
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41 | #undef ACCEPT_O_NDELAY_ALIAS |
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42 | |
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43 | #include <errno.h> |
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44 | #include <string.h> /* strcmp */ |
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45 | #include <unistd.h> |
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46 | #include <stdlib.h> /* calloc() */ |
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47 | |
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48 | #include <rtems/libio.h> /* libio.h not pulled in by rtems */ |
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49 | |
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50 | /* |
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51 | * File descriptor Table Information |
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52 | */ |
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53 | |
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54 | extern uint32_t rtems_libio_number_iops; |
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55 | extern rtems_id rtems_libio_semaphore; |
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56 | extern rtems_libio_t *rtems_libio_iops; |
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57 | extern rtems_libio_t *rtems_libio_iop_freelist; |
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58 | |
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59 | /* |
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60 | * rtems_libio_fcntl_flags |
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61 | * |
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62 | * Convert UNIX fnctl(2) flags to ones that RTEMS drivers understand |
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63 | */ |
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64 | |
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65 | const rtems_assoc_t access_modes_assoc[] = { |
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66 | { "READ", LIBIO_FLAGS_READ, O_RDONLY }, |
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67 | { "WRITE", LIBIO_FLAGS_WRITE, O_WRONLY }, |
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68 | { "READ/WRITE", LIBIO_FLAGS_READ_WRITE, O_RDWR }, |
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69 | { 0, 0, 0 }, |
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70 | }; |
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71 | |
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72 | const rtems_assoc_t status_flags_assoc[] = { |
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73 | #ifdef ACCEPT_O_NDELAY_ALIAS |
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74 | { "NO DELAY", LIBIO_FLAGS_NO_DELAY, O_NDELAY }, |
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75 | #endif |
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76 | { "NONBLOCK", LIBIO_FLAGS_NO_DELAY, O_NONBLOCK }, |
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77 | { "APPEND", LIBIO_FLAGS_APPEND, O_APPEND }, |
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78 | { "CREATE", LIBIO_FLAGS_CREATE, O_CREAT }, |
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79 | { 0, 0, 0 }, |
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80 | }; |
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81 | |
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82 | uint32_t rtems_libio_fcntl_flags( |
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83 | uint32_t fcntl_flags |
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84 | ) |
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85 | { |
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86 | uint32_t flags = 0; |
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87 | uint32_t access_modes; |
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88 | |
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89 | /* |
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90 | * Access mode is a small integer |
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91 | */ |
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92 | |
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93 | access_modes = fcntl_flags & O_ACCMODE; |
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94 | fcntl_flags &= ~O_ACCMODE; |
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95 | flags = rtems_assoc_local_by_remote( access_modes_assoc, access_modes ); |
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96 | |
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97 | /* |
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98 | * Everything else is single bits |
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99 | */ |
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100 | |
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101 | flags |= |
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102 | rtems_assoc_local_by_remote_bitfield(status_flags_assoc, fcntl_flags); |
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103 | return flags; |
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104 | } |
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105 | |
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106 | /* |
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107 | * rtems_libio_to_fcntl_flags |
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108 | * |
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109 | * Convert RTEMS internal flags to UNIX fnctl(2) flags |
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110 | */ |
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111 | |
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112 | uint32_t rtems_libio_to_fcntl_flags( |
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113 | uint32_t flags |
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114 | ) |
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115 | { |
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116 | uint32_t fcntl_flags = 0; |
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117 | |
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118 | if ( (flags & LIBIO_FLAGS_READ_WRITE) == LIBIO_FLAGS_READ_WRITE ) { |
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119 | fcntl_flags |= O_RDWR; |
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120 | } else if ( (flags & LIBIO_FLAGS_READ) == LIBIO_FLAGS_READ) { |
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121 | fcntl_flags |= O_RDONLY; |
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122 | } else if ( (flags & LIBIO_FLAGS_WRITE) == LIBIO_FLAGS_WRITE) { |
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123 | fcntl_flags |= O_WRONLY; |
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124 | } |
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125 | |
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126 | if ( (flags & LIBIO_FLAGS_NO_DELAY) == LIBIO_FLAGS_NO_DELAY ) { |
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127 | fcntl_flags |= O_NONBLOCK; |
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128 | } |
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129 | |
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130 | if ( (flags & LIBIO_FLAGS_APPEND) == LIBIO_FLAGS_APPEND ) { |
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131 | fcntl_flags |= O_APPEND; |
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132 | } |
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133 | |
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134 | if ( (flags & LIBIO_FLAGS_CREATE) == LIBIO_FLAGS_CREATE ) { |
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135 | fcntl_flags |= O_CREAT; |
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136 | } |
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137 | |
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138 | return fcntl_flags; |
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139 | } |
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140 | |
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141 | /* |
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142 | * rtems_libio_allocate |
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143 | * |
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144 | * This routine searches the IOP Table for an unused entry. If it |
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145 | * finds one, it returns it. Otherwise, it returns NULL. |
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146 | */ |
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147 | |
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148 | rtems_libio_t *rtems_libio_allocate( void ) |
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149 | { |
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150 | rtems_libio_t *iop, *next; |
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151 | rtems_status_code rc; |
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152 | rtems_id sema; |
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153 | |
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154 | rtems_semaphore_obtain( rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT ); |
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155 | |
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156 | if (rtems_libio_iop_freelist) { |
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157 | rc = rtems_semaphore_create( |
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158 | RTEMS_LIBIO_IOP_SEM(rtems_libio_iop_freelist - rtems_libio_iops), |
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159 | 1, |
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160 | RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
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161 | RTEMS_NO_PRIORITY, |
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162 | &sema |
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163 | ); |
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164 | if (rc != RTEMS_SUCCESSFUL) |
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165 | goto failed; |
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166 | iop = rtems_libio_iop_freelist; |
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167 | next = iop->data1; |
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168 | (void) memset( iop, 0, sizeof(rtems_libio_t) ); |
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169 | iop->flags = LIBIO_FLAGS_OPEN; |
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170 | iop->sem = sema; |
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171 | rtems_libio_iop_freelist = next; |
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172 | goto done; |
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173 | } |
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174 | |
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175 | failed: |
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176 | iop = 0; |
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177 | |
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178 | done: |
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179 | rtems_semaphore_release( rtems_libio_semaphore ); |
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180 | return iop; |
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181 | } |
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182 | |
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183 | /* |
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184 | * rtems_libio_free |
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185 | * |
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186 | * This routine frees the resources associated with an IOP (file descriptor) |
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187 | * and clears the slot in the IOP Table. |
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188 | */ |
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189 | |
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190 | void rtems_libio_free( |
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191 | rtems_libio_t *iop |
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192 | ) |
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193 | { |
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194 | rtems_semaphore_obtain( rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT ); |
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195 | |
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196 | if (iop->sem) |
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197 | rtems_semaphore_delete(iop->sem); |
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198 | |
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199 | iop->flags &= ~LIBIO_FLAGS_OPEN; |
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200 | iop->data1 = rtems_libio_iop_freelist; |
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201 | rtems_libio_iop_freelist = iop; |
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202 | |
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203 | rtems_semaphore_release(rtems_libio_semaphore); |
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204 | } |
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205 | |
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206 | /* |
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207 | * rtems_libio_is_open_files_in_fs |
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208 | * |
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209 | * This routine scans the entire file descriptor table to determine if the |
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210 | * are any active file descriptors that refer to the at least one node in the |
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211 | * file system that we are trying to dismount. |
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212 | * |
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213 | * If there is at least one node in the file system referenced by the mount |
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214 | * table entry a 1 is returned, otherwise a 0 is returned. |
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215 | */ |
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216 | |
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217 | int rtems_libio_is_open_files_in_fs( |
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218 | rtems_filesystem_mount_table_entry_t * fs_mt_entry |
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219 | ) |
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220 | { |
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221 | rtems_libio_t *iop; |
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222 | int result = 0; |
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223 | uint32_t i; |
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224 | |
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225 | rtems_semaphore_obtain( rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT ); |
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226 | |
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227 | /* |
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228 | * Look for any active file descriptor entry. |
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229 | */ |
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230 | |
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231 | for (iop=rtems_libio_iops,i=0; i < rtems_libio_number_iops; iop++, i++){ |
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232 | |
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233 | if ((iop->flags & LIBIO_FLAGS_OPEN) != 0) { |
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234 | |
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235 | /* |
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236 | * Check if this node is under the file system that we |
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237 | * are trying to dismount. |
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238 | */ |
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239 | |
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240 | if ( iop->pathinfo.mt_entry == fs_mt_entry ) { |
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241 | result = 1; |
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242 | break; |
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243 | } |
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244 | } |
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245 | } |
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246 | |
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247 | rtems_semaphore_release( rtems_libio_semaphore ); |
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248 | |
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249 | return result; |
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250 | } |
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251 | |
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252 | /* |
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253 | * rtems_libio_is_file_open |
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254 | * |
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255 | * This routine scans the entire file descriptor table to determine if the |
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256 | * given file refers to an active file descriptor. |
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257 | * |
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258 | * If the given file is open a 1 is returned, otherwise a 0 is returned. |
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259 | */ |
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260 | |
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261 | int rtems_libio_is_file_open( |
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262 | void *node_access |
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263 | ) |
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264 | { |
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265 | rtems_libio_t *iop; |
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266 | int result=0; |
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267 | uint32_t i; |
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268 | |
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269 | rtems_semaphore_obtain( rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT ); |
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270 | |
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271 | /* |
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272 | * Look for any active file descriptor entry. |
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273 | */ |
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274 | |
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275 | for (iop=rtems_libio_iops,i=0; i < rtems_libio_number_iops; iop++, i++){ |
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276 | if ((iop->flags & LIBIO_FLAGS_OPEN) != 0) { |
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277 | |
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278 | /* |
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279 | * Check if this node is under the file system that we |
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280 | * are trying to dismount. |
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281 | */ |
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282 | |
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283 | if ( iop->pathinfo.node_access == node_access ) { |
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284 | result = 1; |
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285 | break; |
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286 | } |
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287 | } |
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288 | } |
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289 | |
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290 | rtems_semaphore_release( rtems_libio_semaphore ); |
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291 | |
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292 | return result; |
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293 | } |
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