1 | /* |
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2 | * Copyright (C) 2014 Chris Johns (chrisj@rtems.org) |
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3 | * |
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4 | * The license and distribution terms for this file may be |
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5 | * found in the file LICENSE in this distribution. |
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6 | * |
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7 | * This software with is provided ``as is'' and with NO WARRANTY. |
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8 | */ |
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9 | |
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10 | /* |
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11 | * RTEMS std redirector. |
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12 | */ |
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13 | |
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14 | #include <errno.h> |
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15 | #include <stdio.h> |
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16 | #include <stdlib.h> |
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17 | #include <string.h> |
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18 | #include <strings.h> |
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19 | #include <sys/types.h> |
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20 | #include <unistd.h> |
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21 | |
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22 | #include <rtems/thread.h> |
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23 | #include <rtems/error.h> |
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24 | #include <rtems/stdio-redirect.h> |
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25 | |
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26 | #define RTEMS_STDIO_REDIRECT_RUNNING (1 << 0) |
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27 | #define RTEMS_STDIO_REDIRECT_FINISHED (1 << 1) |
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28 | |
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29 | static void |
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30 | rtems_stdio_redirect_lock(rtems_stdio_redirect* sr) |
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31 | { |
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32 | rtems_mutex_lock(&sr->lock); |
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33 | } |
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34 | |
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35 | static void |
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36 | rtems_stdio_redirect_unlock(rtems_stdio_redirect* sr) |
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37 | { |
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38 | rtems_mutex_unlock(&sr->lock); |
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39 | } |
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40 | |
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41 | static void |
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42 | rtems_stdio_redirect_write (rtems_stdio_redirect* sr, const char* buf, ssize_t len) |
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43 | { |
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44 | rtems_stdio_redirect_lock(sr); |
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45 | |
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46 | if (sr->buffer) |
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47 | { |
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48 | if (len >= sr->buffer_size) |
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49 | { |
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50 | ssize_t offset = len - sr->buffer_size; |
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51 | memcpy (sr->buffer, buf + offset, sr->buffer_size); |
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52 | sr->in = 0; |
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53 | sr->full = true; |
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54 | } |
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55 | else |
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56 | { |
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57 | if ((sr->in + len) > sr->buffer_size) |
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58 | { |
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59 | ssize_t bytes = sr->buffer_size - sr->in; |
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60 | memcpy (sr->buffer + sr->in, buf, bytes); |
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61 | buf += bytes; |
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62 | len -= bytes; |
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63 | sr->in = 0; |
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64 | sr->full = true; |
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65 | } |
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66 | else |
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67 | { |
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68 | memcpy (sr->buffer + sr->in, buf, len); |
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69 | sr->in += len; |
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70 | } |
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71 | } |
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72 | } |
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73 | |
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74 | if (sr->handler) |
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75 | sr->handler(buf, len); |
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76 | |
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77 | rtems_stdio_redirect_unlock(sr); |
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78 | } |
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79 | |
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80 | static rtems_task |
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81 | rtems_stdio_redirect_reader(rtems_task_argument arg) |
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82 | { |
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83 | rtems_stdio_redirect* sr = (rtems_stdio_redirect*) arg; |
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84 | |
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85 | while (sr->state & RTEMS_STDIO_REDIRECT_RUNNING) |
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86 | { |
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87 | ssize_t r = read (sr->pipe[0], sr->input, sr->input_size); |
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88 | |
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89 | if (r <= 0) |
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90 | break; |
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91 | |
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92 | if (sr->echo) |
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93 | write (sr->fd_dup, sr->input, r); |
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94 | |
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95 | rtems_stdio_redirect_write (sr, sr->input, r); |
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96 | } |
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97 | |
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98 | sr->state |= RTEMS_STDIO_REDIRECT_FINISHED; |
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99 | |
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100 | rtems_task_delete(RTEMS_SELF); |
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101 | } |
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102 | |
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103 | rtems_stdio_redirect* |
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104 | rtems_stdio_redirect_open(int fd, |
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105 | rtems_task_priority priority, |
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106 | size_t stack_size, |
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107 | ssize_t input_size, |
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108 | ssize_t buffer_size, |
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109 | bool echo, |
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110 | rtems_stdio_redirect_handler handler) |
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111 | { |
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112 | rtems_stdio_redirect* sr; |
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113 | rtems_name name; |
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114 | rtems_status_code sc; |
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115 | |
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116 | sr = malloc(sizeof(*sr)); |
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117 | if (!sr) |
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118 | { |
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119 | fprintf(stderr, "error: stdio-redirect: no memory\n"); |
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120 | return NULL; |
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121 | } |
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122 | |
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123 | memset(sr, 0, sizeof(*sr)); |
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124 | |
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125 | sr->input_size = input_size; |
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126 | sr->input = malloc(input_size); |
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127 | if (!sr->input) |
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128 | { |
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129 | fprintf(stderr, "error: stdio-redirect: no memory for input\n"); |
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130 | free(sr); |
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131 | return NULL; |
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132 | } |
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133 | |
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134 | if (buffer_size) |
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135 | { |
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136 | sr->buffer_size = buffer_size; |
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137 | sr->buffer = malloc(buffer_size); |
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138 | if (!sr->buffer) |
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139 | { |
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140 | fprintf(stderr, "error: stdio-redirect: no memory for buffer\n"); |
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141 | free(sr->input); |
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142 | free(sr); |
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143 | return NULL; |
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144 | } |
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145 | } |
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146 | |
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147 | sr->fd = fd; |
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148 | |
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149 | sr->fd_dup = dup(fd); |
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150 | if (sr->fd_dup < 0) |
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151 | { |
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152 | fprintf(stderr, "error: stdio-redirect: dup: %s\n", strerror(errno)); |
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153 | free(sr->buffer); |
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154 | free(sr->input); |
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155 | free(sr); |
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156 | return NULL; |
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157 | } |
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158 | |
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159 | if (pipe(sr->pipe) < 0) |
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160 | { |
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161 | fprintf(stderr, "error: stdio-redirect: pipe create: %s\n", strerror(errno)); |
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162 | free(sr->buffer); |
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163 | free(sr->input); |
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164 | free(sr); |
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165 | return NULL; |
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166 | |
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167 | } |
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168 | |
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169 | sr->echo = echo; |
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170 | sr->handler = handler; |
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171 | |
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172 | rtems_mutex_init(&sr->lock, "stdio-redirect"); |
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173 | |
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174 | name = rtems_build_name ('S', 'R', '0' + (fd / 10), '0' + (fd % 10)); |
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175 | sc = rtems_task_create (name, |
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176 | priority, |
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177 | stack_size, |
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178 | RTEMS_PREEMPT | RTEMS_NO_TIMESLICE | RTEMS_NO_ASR, |
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179 | RTEMS_LOCAL | RTEMS_NO_FLOATING_POINT, |
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180 | &sr->reader); |
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181 | if (sc != RTEMS_SUCCESSFUL) |
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182 | { |
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183 | fprintf(stderr, "error: stdio-redirect: reader create: %s\n", rtems_status_text(sc)); |
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184 | rtems_mutex_destroy(&sr->lock); |
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185 | free(sr->buffer); |
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186 | free(sr->input); |
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187 | free(sr); |
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188 | return NULL; |
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189 | } |
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190 | |
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191 | sr->state |= RTEMS_STDIO_REDIRECT_RUNNING; |
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192 | |
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193 | if (dup2 (sr->pipe[1], fd) < 0) |
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194 | { |
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195 | fprintf(stderr, "error: stdio-redirect: dup2: %s\n", strerror(errno)); |
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196 | free(sr->buffer); |
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197 | free(sr->input); |
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198 | free(sr); |
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199 | return NULL; |
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200 | } |
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201 | |
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202 | sc = rtems_task_start (sr->reader, |
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203 | rtems_stdio_redirect_reader, |
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204 | (rtems_task_argument) sr); |
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205 | |
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206 | if (sc != RTEMS_SUCCESSFUL) |
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207 | { |
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208 | fprintf(stderr, "error: stdio-redirect: reader start: %s\n", rtems_status_text(sc)); |
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209 | rtems_task_delete(sr->reader); |
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210 | rtems_mutex_destroy(&sr->lock); |
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211 | free(sr->buffer); |
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212 | free(sr->input); |
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213 | free(sr); |
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214 | return NULL; |
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215 | } |
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216 | |
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217 | return sr; |
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218 | } |
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219 | |
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220 | void |
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221 | rtems_stdio_redirect_close(rtems_stdio_redirect* sr) |
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222 | { |
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223 | rtems_stdio_redirect_lock(sr); |
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224 | |
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225 | sr->state &= ~RTEMS_STDIO_REDIRECT_RUNNING; |
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226 | close(sr->pipe[0]); |
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227 | |
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228 | rtems_stdio_redirect_unlock(sr); |
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229 | |
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230 | while (sr->state & RTEMS_STDIO_REDIRECT_FINISHED) |
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231 | { |
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232 | usleep(250UL * 1000000UL); |
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233 | } |
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234 | |
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235 | rtems_stdio_redirect_lock(sr); |
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236 | |
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237 | dup2(sr->fd, sr->fd_dup); |
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238 | |
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239 | free(sr->buffer); |
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240 | free(sr->input); |
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241 | |
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242 | rtems_stdio_redirect_unlock(sr); |
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243 | |
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244 | rtems_mutex_destroy(&sr->lock); |
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245 | |
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246 | free(sr); |
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247 | } |
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248 | |
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249 | ssize_t |
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250 | rtems_stdio_redirect_read(rtems_stdio_redirect* sr, |
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251 | char* buffer, |
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252 | ssize_t length) |
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253 | { |
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254 | ssize_t written = 0; |
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255 | |
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256 | rtems_stdio_redirect_lock(sr); |
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257 | |
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258 | if (sr->buffer) |
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259 | { |
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260 | ssize_t rem = 0; |
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261 | |
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262 | if (sr->full) |
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263 | { |
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264 | if (length < sr->buffer_size) |
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265 | { |
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266 | if (length > sr->in) |
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267 | { |
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268 | rem = length - sr->in; |
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269 | memcpy (buffer, sr->buffer + sr->buffer_size - rem, rem); |
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270 | } |
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271 | |
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272 | memcpy (buffer + rem, sr->buffer, sr->in); |
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273 | written = length; |
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274 | } |
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275 | else |
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276 | { |
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277 | rem = sr->buffer_size - sr->in; |
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278 | memcpy (buffer, sr->buffer + sr->in, rem); |
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279 | memcpy (buffer + rem, sr->buffer, sr->in); |
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280 | written = sr->buffer_size; |
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281 | } |
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282 | |
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283 | sr->full = false; |
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284 | } |
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285 | else if (length < sr->in) |
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286 | { |
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287 | rem = sr->in - length; |
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288 | memcpy (buffer, sr->buffer + rem, length); |
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289 | written = length; |
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290 | } |
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291 | else |
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292 | { |
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293 | memcpy (buffer, sr->buffer, sr->in); |
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294 | written = sr->in; |
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295 | } |
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296 | } |
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297 | |
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298 | rtems_stdio_redirect_unlock(sr); |
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299 | |
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300 | return written; |
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301 | } |
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