1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief File Descriptor Routines |
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5 | * @ingroup LibIOInternal |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-1999. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <fcntl.h> |
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22 | #include <stdio.h> |
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23 | #include <stdlib.h> |
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24 | #include <string.h> |
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25 | #include <unistd.h> |
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26 | |
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27 | #include <rtems.h> |
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28 | #include <rtems/libio_.h> |
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29 | #include <rtems/assoc.h> |
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30 | |
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31 | /* define this to alias O_NDELAY to O_NONBLOCK, i.e., |
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32 | * O_NDELAY is accepted on input but fcntl(F_GETFL) returns |
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33 | * O_NONBLOCK. This is because rtems has no distinction |
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34 | * between the two (but some systems have). |
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35 | * Note that accepting this alias creates a problem: |
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36 | * an application trying to clear the non-blocking flag |
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37 | * using a |
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38 | * |
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39 | * fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) & ~O_NDELAY); |
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40 | * |
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41 | * does (silently) ignore the operation. |
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42 | */ |
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43 | #undef ACCEPT_O_NDELAY_ALIAS |
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44 | |
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45 | static const rtems_assoc_t access_modes_assoc[] = { |
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46 | { "READ", LIBIO_FLAGS_READ, O_RDONLY }, |
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47 | { "WRITE", LIBIO_FLAGS_WRITE, O_WRONLY }, |
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48 | { "READ/WRITE", LIBIO_FLAGS_READ_WRITE, O_RDWR }, |
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49 | { 0, 0, 0 }, |
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50 | }; |
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51 | |
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52 | static const rtems_assoc_t status_flags_assoc[] = { |
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53 | #ifdef ACCEPT_O_NDELAY_ALIAS |
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54 | { "NO DELAY", LIBIO_FLAGS_NO_DELAY, O_NDELAY }, |
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55 | #endif |
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56 | { "NONBLOCK", LIBIO_FLAGS_NO_DELAY, O_NONBLOCK }, |
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57 | { "APPEND", LIBIO_FLAGS_APPEND, O_APPEND }, |
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58 | { 0, 0, 0 }, |
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59 | }; |
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60 | |
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61 | unsigned int rtems_libio_fcntl_flags( int fcntl_flags ) |
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62 | { |
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63 | unsigned int flags = 0; |
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64 | uint32_t access_modes; |
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65 | |
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66 | /* |
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67 | * Access mode is a small integer |
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68 | */ |
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69 | |
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70 | access_modes = (unsigned int) (fcntl_flags & O_ACCMODE); |
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71 | fcntl_flags &= ~O_ACCMODE; |
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72 | flags = rtems_assoc_local_by_remote( access_modes_assoc, access_modes ); |
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73 | |
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74 | /* |
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75 | * Everything else is single bits |
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76 | */ |
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77 | |
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78 | flags |= (unsigned int ) rtems_assoc_local_by_remote_bitfield( |
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79 | status_flags_assoc, |
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80 | (uint32_t) fcntl_flags |
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81 | ); |
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82 | |
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83 | return flags; |
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84 | } |
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85 | |
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86 | int rtems_libio_to_fcntl_flags( unsigned int flags ) |
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87 | { |
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88 | int fcntl_flags = 0; |
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89 | |
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90 | if ( (flags & LIBIO_FLAGS_READ_WRITE) == LIBIO_FLAGS_READ_WRITE ) { |
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91 | fcntl_flags |= O_RDWR; |
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92 | } else if ( (flags & LIBIO_FLAGS_READ) == LIBIO_FLAGS_READ) { |
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93 | fcntl_flags |= O_RDONLY; |
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94 | } else if ( (flags & LIBIO_FLAGS_WRITE) == LIBIO_FLAGS_WRITE) { |
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95 | fcntl_flags |= O_WRONLY; |
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96 | } |
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97 | |
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98 | if ( (flags & LIBIO_FLAGS_NO_DELAY) == LIBIO_FLAGS_NO_DELAY ) { |
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99 | fcntl_flags |= O_NONBLOCK; |
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100 | } |
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101 | |
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102 | if ( (flags & LIBIO_FLAGS_APPEND) == LIBIO_FLAGS_APPEND ) { |
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103 | fcntl_flags |= O_APPEND; |
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104 | } |
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105 | |
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106 | return fcntl_flags; |
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107 | } |
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108 | |
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109 | rtems_libio_t *rtems_libio_allocate( void ) |
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110 | { |
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111 | rtems_libio_t *iop; |
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112 | |
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113 | rtems_libio_lock(); |
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114 | |
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115 | iop = rtems_libio_iop_free_head; |
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116 | |
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117 | if ( iop != NULL ) { |
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118 | void *next; |
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119 | |
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120 | next = iop->data1; |
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121 | rtems_libio_iop_free_head = next; |
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122 | |
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123 | if ( next == NULL ) { |
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124 | rtems_libio_iop_free_tail = &rtems_libio_iop_free_head; |
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125 | } |
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126 | } |
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127 | |
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128 | rtems_libio_unlock(); |
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129 | |
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130 | return iop; |
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131 | } |
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132 | |
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133 | void rtems_libio_free( |
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134 | rtems_libio_t *iop |
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135 | ) |
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136 | { |
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137 | size_t zero; |
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138 | |
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139 | rtems_filesystem_location_free( &iop->pathinfo ); |
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140 | |
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141 | rtems_libio_lock(); |
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142 | |
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143 | /* |
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144 | * Clear everything except the reference count part. At this point in time |
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145 | * there may be still some holders of this file descriptor. |
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146 | */ |
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147 | rtems_libio_iop_flags_clear( iop, LIBIO_FLAGS_REFERENCE_INC - 1U ); |
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148 | zero = offsetof( rtems_libio_t, offset ); |
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149 | memset( (char *) iop + zero, 0, sizeof( *iop ) - zero ); |
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150 | |
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151 | /* |
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152 | * Append it to the free list. This increases the likelihood that a use |
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153 | * after close is detected. |
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154 | */ |
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155 | *rtems_libio_iop_free_tail = iop; |
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156 | rtems_libio_iop_free_tail = &iop->data1; |
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157 | |
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158 | rtems_libio_unlock(); |
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159 | } |
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