1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief FIFO Support |
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5 | * @ingroup IMFS |
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6 | */ |
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7 | |
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8 | /* |
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9 | * Author: Wei Shen <cquark@gmail.com> |
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10 | * |
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11 | * The license and distribution terms for this file may be |
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12 | * found in the file LICENSE in this distribution or at |
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13 | * http://www.rtems.com/license/LICENSE. |
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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 "imfs.h" |
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21 | |
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22 | #define JNODE2PIPE(_jnode) ( (_jnode)->info.fifo.pipe ) |
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23 | |
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24 | #define LIBIO2PIPE(_iop) ( JNODE2PIPE((IMFS_jnode_t *)(_iop)->pathinfo.node_access) ) |
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25 | |
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26 | /* Set errno and return -1 if error, else return _err */ |
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27 | #define IMFS_FIFO_RETURN(_err) \ |
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28 | do { \ |
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29 | if (_err < 0) \ |
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30 | rtems_set_errno_and_return_minus_one(-_err); \ |
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31 | return _err; \ |
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32 | } while (0) |
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33 | |
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34 | static int IMFS_fifo_open( |
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35 | rtems_libio_t *iop, |
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36 | const char *pathname, |
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37 | int oflag, |
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38 | mode_t mode |
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39 | ) |
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40 | { |
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41 | IMFS_jnode_t *jnode = iop->pathinfo.node_access; |
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42 | |
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43 | int err = fifo_open(&JNODE2PIPE(jnode), iop); |
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44 | IMFS_FIFO_RETURN(err); |
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45 | } |
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46 | |
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47 | static int IMFS_fifo_close( |
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48 | rtems_libio_t *iop |
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49 | ) |
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50 | { |
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51 | int err = 0; |
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52 | IMFS_jnode_t *jnode = iop->pathinfo.node_access; |
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53 | |
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54 | pipe_release(&JNODE2PIPE(jnode), iop); |
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55 | |
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56 | IMFS_FIFO_RETURN(err); |
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57 | } |
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58 | |
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59 | static ssize_t IMFS_fifo_read( |
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60 | rtems_libio_t *iop, |
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61 | void *buffer, |
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62 | size_t count |
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63 | ) |
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64 | { |
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65 | IMFS_jnode_t *jnode = iop->pathinfo.node_access; |
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66 | |
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67 | int err = pipe_read(JNODE2PIPE(jnode), buffer, count, iop); |
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68 | if (err > 0) |
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69 | IMFS_update_atime(jnode); |
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70 | |
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71 | IMFS_FIFO_RETURN(err); |
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72 | } |
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73 | |
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74 | static ssize_t IMFS_fifo_write( |
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75 | rtems_libio_t *iop, |
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76 | const void *buffer, |
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77 | size_t count |
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78 | ) |
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79 | { |
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80 | IMFS_jnode_t *jnode = iop->pathinfo.node_access; |
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81 | |
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82 | int err = pipe_write(JNODE2PIPE(jnode), buffer, count, iop); |
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83 | if (err > 0) { |
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84 | IMFS_mtime_ctime_update(jnode); |
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85 | } |
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86 | |
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87 | IMFS_FIFO_RETURN(err); |
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88 | } |
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89 | |
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90 | static int IMFS_fifo_ioctl( |
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91 | rtems_libio_t *iop, |
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92 | ioctl_command_t command, |
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93 | void *buffer |
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94 | ) |
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95 | { |
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96 | int err; |
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97 | |
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98 | if (command == FIONBIO) { |
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99 | if (buffer == NULL) |
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100 | err = -EFAULT; |
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101 | else { |
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102 | if (*(int *)buffer) |
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103 | iop->flags |= LIBIO_FLAGS_NO_DELAY; |
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104 | else |
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105 | iop->flags &= ~LIBIO_FLAGS_NO_DELAY; |
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106 | return 0; |
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107 | } |
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108 | } |
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109 | else |
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110 | err = pipe_ioctl(LIBIO2PIPE(iop), command, buffer, iop); |
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111 | |
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112 | IMFS_FIFO_RETURN(err); |
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113 | } |
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114 | |
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115 | static const rtems_filesystem_file_handlers_r IMFS_fifo_handlers = { |
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116 | .open_h = IMFS_fifo_open, |
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117 | .close_h = IMFS_fifo_close, |
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118 | .read_h = IMFS_fifo_read, |
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119 | .write_h = IMFS_fifo_write, |
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120 | .ioctl_h = IMFS_fifo_ioctl, |
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121 | .lseek_h = rtems_filesystem_default_lseek, |
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122 | .fstat_h = IMFS_stat, |
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123 | .ftruncate_h = rtems_filesystem_default_ftruncate, |
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124 | .fsync_h = rtems_filesystem_default_fsync_or_fdatasync, |
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125 | .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync, |
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126 | .fcntl_h = rtems_filesystem_default_fcntl, |
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127 | .readv_h = rtems_filesystem_default_readv, |
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128 | .writev_h = rtems_filesystem_default_writev |
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129 | }; |
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130 | |
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131 | const IMFS_node_control IMFS_node_control_fifo = { |
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132 | .imfs_type = IMFS_FIFO, |
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133 | .handlers = &IMFS_fifo_handlers, |
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134 | .node_initialize = IMFS_node_initialize_default, |
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135 | .node_remove = IMFS_node_remove_default, |
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136 | .node_destroy = IMFS_node_destroy_default |
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137 | }; |
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