1 | /* SPDX-License-Identifier: BSD-2-Clause */ |
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2 | |
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3 | /** |
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4 | * @file |
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5 | * |
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6 | * @ingroup IMFS |
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7 | * |
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8 | * @brief FIFO Support |
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9 | */ |
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10 | |
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11 | /* |
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12 | * Author: Wei Shen <cquark@gmail.com> |
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13 | * |
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14 | * Redistribution and use in source and binary forms, with or without |
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15 | * modification, are permitted provided that the following conditions |
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16 | * are met: |
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17 | * 1. Redistributions of source code must retain the above copyright |
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18 | * notice, this list of conditions and the following disclaimer. |
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19 | * 2. Redistributions in binary form must reproduce the above copyright |
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20 | * notice, this list of conditions and the following disclaimer in the |
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21 | * documentation and/or other materials provided with the distribution. |
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22 | * |
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23 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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24 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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27 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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28 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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29 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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30 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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31 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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32 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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33 | * POSSIBILITY OF SUCH DAMAGE. |
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34 | */ |
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35 | |
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36 | #ifdef HAVE_CONFIG_H |
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37 | #include "config.h" |
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38 | #endif |
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39 | |
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40 | #include <rtems/imfsimpl.h> |
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41 | |
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42 | #include <sys/filio.h> |
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43 | |
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44 | #define JNODE2PIPE(_jnode) ( ((IMFS_fifo_t *)(_jnode))->pipe ) |
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45 | |
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46 | #define LIBIO2PIPE(_iop) ( JNODE2PIPE((IMFS_jnode_t *)(_iop)->pathinfo.node_access) ) |
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47 | |
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48 | /* Set errno and return -1 if error, else return _err */ |
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49 | #define IMFS_FIFO_RETURN(_err) \ |
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50 | do { \ |
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51 | if (_err < 0) \ |
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52 | rtems_set_errno_and_return_minus_one(-_err); \ |
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53 | return _err; \ |
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54 | } while (0) |
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55 | |
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56 | static int IMFS_fifo_open( |
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57 | rtems_libio_t *iop, |
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58 | const char *pathname, |
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59 | int oflag, |
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60 | mode_t mode |
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61 | ) |
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62 | { |
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63 | IMFS_jnode_t *jnode = iop->pathinfo.node_access; |
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64 | |
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65 | int err = fifo_open(&JNODE2PIPE(jnode), iop); |
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66 | IMFS_FIFO_RETURN(err); |
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67 | } |
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68 | |
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69 | static int IMFS_fifo_close( |
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70 | rtems_libio_t *iop |
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71 | ) |
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72 | { |
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73 | int err = 0; |
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74 | IMFS_jnode_t *jnode = iop->pathinfo.node_access; |
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75 | |
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76 | pipe_release(&JNODE2PIPE(jnode), iop); |
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77 | |
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78 | IMFS_FIFO_RETURN(err); |
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79 | } |
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80 | |
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81 | static ssize_t IMFS_fifo_read( |
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82 | rtems_libio_t *iop, |
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83 | void *buffer, |
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84 | size_t count |
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85 | ) |
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86 | { |
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87 | IMFS_jnode_t *jnode = iop->pathinfo.node_access; |
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88 | |
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89 | int err = pipe_read(JNODE2PIPE(jnode), buffer, count, iop); |
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90 | if (err > 0) |
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91 | IMFS_update_atime(jnode); |
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92 | |
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93 | IMFS_FIFO_RETURN(err); |
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94 | } |
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95 | |
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96 | static ssize_t IMFS_fifo_write( |
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97 | rtems_libio_t *iop, |
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98 | const void *buffer, |
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99 | size_t count |
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100 | ) |
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101 | { |
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102 | IMFS_jnode_t *jnode = iop->pathinfo.node_access; |
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103 | |
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104 | int err = pipe_write(JNODE2PIPE(jnode), buffer, count, iop); |
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105 | if (err > 0) { |
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106 | IMFS_mtime_ctime_update(jnode); |
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107 | } |
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108 | |
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109 | IMFS_FIFO_RETURN(err); |
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110 | } |
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111 | |
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112 | static int IMFS_fifo_ioctl( |
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113 | rtems_libio_t *iop, |
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114 | ioctl_command_t command, |
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115 | void *buffer |
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116 | ) |
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117 | { |
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118 | int err; |
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119 | |
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120 | if (command == FIONBIO) { |
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121 | if (buffer == NULL) |
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122 | err = -EFAULT; |
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123 | else { |
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124 | if (*(int *)buffer) |
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125 | rtems_libio_iop_flags_set( iop, LIBIO_FLAGS_NO_DELAY ); |
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126 | else |
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127 | rtems_libio_iop_flags_clear( iop, LIBIO_FLAGS_NO_DELAY ); |
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128 | return 0; |
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129 | } |
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130 | } |
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131 | else |
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132 | err = pipe_ioctl(LIBIO2PIPE(iop), command, buffer, iop); |
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133 | |
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134 | IMFS_FIFO_RETURN(err); |
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135 | } |
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136 | |
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137 | static const rtems_filesystem_file_handlers_r IMFS_fifo_handlers = { |
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138 | .open_h = IMFS_fifo_open, |
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139 | .close_h = IMFS_fifo_close, |
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140 | .read_h = IMFS_fifo_read, |
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141 | .write_h = IMFS_fifo_write, |
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142 | .ioctl_h = IMFS_fifo_ioctl, |
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143 | .lseek_h = rtems_filesystem_default_lseek, |
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144 | .fstat_h = IMFS_stat, |
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145 | .ftruncate_h = rtems_filesystem_default_ftruncate, |
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146 | .fsync_h = rtems_filesystem_default_fsync_or_fdatasync, |
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147 | .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync, |
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148 | .fcntl_h = rtems_filesystem_default_fcntl, |
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149 | .kqfilter_h = rtems_filesystem_default_kqfilter, |
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150 | .mmap_h = rtems_filesystem_default_mmap, |
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151 | .poll_h = rtems_filesystem_default_poll, |
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152 | .readv_h = rtems_filesystem_default_readv, |
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153 | .writev_h = rtems_filesystem_default_writev |
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154 | }; |
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155 | |
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156 | const IMFS_mknod_control IMFS_mknod_control_fifo = { |
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157 | { |
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158 | .handlers = &IMFS_fifo_handlers, |
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159 | .node_initialize = IMFS_node_initialize_default, |
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160 | .node_remove = IMFS_node_remove_default, |
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161 | .node_destroy = IMFS_node_destroy_default |
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162 | }, |
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163 | .node_size = sizeof( IMFS_fifo_t ) |
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164 | }; |
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