1 | /* |
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2 | * Copyright (c) 2016, 2020 Joel Sherrill <joel@rtems.org>. |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * |
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14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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24 | * SUCH DAMAGE. |
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25 | */ |
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26 | |
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27 | #ifdef HAVE_CONFIG_H |
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28 | #include "config.h" |
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29 | #endif |
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30 | |
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31 | #define _POSIX_26_C_SOURCE |
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32 | |
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33 | #include <devctl.h> |
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34 | #include <sys/ioctl.h> |
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35 | #include <rtems/seterr.h> |
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36 | |
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37 | #include <unistd.h> |
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38 | #include <fcntl.h> |
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39 | |
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40 | int posix_devctl( |
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41 | int fd, |
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42 | int dcmd, |
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43 | void *__restrict dev_data_ptr, |
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44 | size_t nbyte, |
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45 | int *__restrict dev_info_ptr |
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46 | ) |
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47 | { |
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48 | int rv = 0; |
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49 | |
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50 | /* |
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51 | * posix_devctl() is supposed to return an errno. errno needs to be |
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52 | * preserved in spite of calling methods (e.g., close, fcntl, and ioctl) |
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53 | * that set it. |
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54 | */ |
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55 | int errno_copy = errno; |
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56 | |
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57 | /* |
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58 | * The POSIX 1003.26 standard allows for library implementations |
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59 | * that implement posix_devctl() using ioctl(). In this case, |
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60 | * the extra parameters are largely ignored. |
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61 | * |
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62 | * The FACE Technical Standard requires only that FIONBIO |
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63 | * be supported for sockets. |
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64 | * |
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65 | * This method appears to be rarely implemented and there are |
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66 | * no known required use cases for this method beyond those |
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67 | * from the FACE Technical Standard. |
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68 | */ |
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69 | |
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70 | /* |
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71 | * POSIX 1003.26 mentions that nbyte must be non-negative but this |
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72 | * doesn't make sense because size_t is guaranteed to be unsigned. |
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73 | */ |
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74 | |
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75 | /* |
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76 | * Since this is implemented on top of ioctl(), the device information |
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77 | * is not going to be passed down. Fill it in with zero so the behavior |
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78 | * is defined. |
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79 | */ |
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80 | if (dev_info_ptr != NULL) { |
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81 | *dev_info_ptr = 0; |
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82 | } |
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83 | |
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84 | /* |
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85 | * |
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86 | */ |
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87 | switch (dcmd) { |
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88 | |
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89 | /* |
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90 | * The FACE Technical Standard Edition 3.0 and newer requires the SOCKCLOSE |
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91 | * ioctl command. This is because the Security Profile does not include |
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92 | * close() and applications need a way to close sockets. Closing sockets is |
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93 | * a minimum requirement so using close() in the implementation meets that |
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94 | * requirement but also lets the application close other file types. |
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95 | */ |
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96 | case SOCKCLOSE: |
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97 | if (close(fd) != 0) { |
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98 | rv = errno; |
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99 | errno = errno_copy; |
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100 | |
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101 | return rv; |
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102 | } |
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103 | break; |
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104 | |
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105 | /* |
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106 | * The FACE Technical Standard Edition 3.0 and newer requires the |
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107 | * posix_devctl command to support the FIONBIO subcommand. |
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108 | */ |
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109 | case FIONBIO: { |
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110 | int tmp_flag; |
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111 | int flag; |
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112 | |
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113 | if (nbyte != sizeof(int)) { |
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114 | return EINVAL; |
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115 | } |
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116 | |
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117 | tmp_flag = fcntl(fd, F_GETFL, 0); |
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118 | if (tmp_flag == -1) { |
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119 | rv = errno; |
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120 | errno = errno_copy; |
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121 | |
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122 | return rv; |
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123 | } |
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124 | |
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125 | flag = *(int *)dev_data_ptr; |
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126 | |
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127 | if (flag != 0) { |
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128 | tmp_flag |= O_NONBLOCK; |
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129 | } else { |
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130 | tmp_flag &= ~O_NONBLOCK; |
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131 | } |
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132 | |
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133 | (void) fcntl(fd, F_SETFL, tmp_flag); |
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134 | break; |
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135 | } |
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136 | |
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137 | default: |
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138 | if (ioctl(fd, dcmd, dev_data_ptr) != 0) { |
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139 | rv = errno; |
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140 | errno = errno_copy; |
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141 | |
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142 | return rv; |
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143 | } |
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144 | break; |
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145 | } |
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146 | |
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147 | errno = errno_copy; |
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148 | |
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149 | return rv; |
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150 | } |
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