1 | /////////////////////////////////////////////////////////////////////////////// |
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2 | // File : ksh.c |
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3 | // Date : October 2017 |
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4 | // Author : Alain Greiner |
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5 | /////////////////////////////////////////////////////////////////////////////// |
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6 | // This application implements a minimal shell for ALMOS-MKH. |
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7 | // |
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8 | // This user KSH process contains two POSIX threads: |
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9 | // - the "main" thread contains the infinite loop implementing |
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10 | // the children processes termination monitoring using the wait syscall. |
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11 | // - the "interactive" thread contains the infinite loop implementing |
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12 | // the command interpreter attached to the TXT terminal. |
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13 | // This "interactive" thread block and deschedules when the KSH process |
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14 | // loses the TXT terminal ownership. It is reactivated when the KSH |
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15 | // process returns in background. |
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16 | // |
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17 | // Note: the children processes are created by the <load> command, and are |
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18 | // attached to the same TXT terminal as the KSH process itself. |
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19 | // . A child process can be lauched in foreground: the KSH process loses |
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20 | // the TXT terminal ownership, that is transfered to the new process. |
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21 | // . A child process can be lauched in background: the KSH process keeps |
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22 | // the TXT terminal ownership. that is transfered to the new process. |
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23 | /////////////////////////////////////////////////////////////////////////////// |
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24 | |
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25 | #include <stdio.h> |
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26 | #include <stdlib.h> |
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27 | #include <string.h> |
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28 | #include <sys/wait.h> |
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29 | #include <signal.h> |
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30 | #include <unistd.h> |
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31 | #include <almosmkh.h> |
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32 | #include <semaphore.h> |
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33 | |
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34 | #define CMD_MAX_SIZE (256) // max number of characters in one command |
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35 | #define LOG_DEPTH (32) // max number of registered commands |
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36 | #define MAX_ARGS (32) // max number of arguments in a command |
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37 | #define FIFO_SIZE (1024) // FIFO depth for recursive ls |
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38 | |
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39 | #define KSH_DEBUG 0 |
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40 | |
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41 | //////////////////////////////////////////////////////////////////////////////// |
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42 | // Structures |
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43 | //////////////////////////////////////////////////////////////////////////////// |
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44 | |
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45 | // one entry in the registered commands array |
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46 | typedef struct log_entry_s |
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47 | { |
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48 | char buf[CMD_MAX_SIZE]; |
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49 | unsigned int count; |
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50 | } |
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51 | log_entry_t; |
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52 | |
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53 | // one entry in the supported command types array |
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54 | typedef struct ksh_cmd_s |
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55 | { |
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56 | char * name; |
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57 | char * desc; |
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58 | void (*fn)( int , char ** ); |
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59 | } |
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60 | ksh_cmd_t; |
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61 | |
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62 | |
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63 | //////////////////////////////////////////////////////////////////////////////// |
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64 | // Global Variables |
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65 | //////////////////////////////////////////////////////////////////////////////// |
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66 | |
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67 | ksh_cmd_t cmd[]; // array of supported commands |
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68 | |
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69 | log_entry_t log_entries[LOG_DEPTH]; // array of registered commands |
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70 | |
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71 | unsigned int ptw; // write pointer in log_entries[] |
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72 | unsigned int ptr; // read pointer in log_entries[] |
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73 | |
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74 | pthread_attr_t attr; // interactive thread attributes |
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75 | |
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76 | sem_t semaphore; // block interactive thread when zero |
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77 | |
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78 | //////////////////////////////////////////////////////////////////////////////// |
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79 | // Shell Commands |
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80 | //////////////////////////////////////////////////////////////////////////////// |
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81 | |
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82 | ///////////////////////////////////////////// |
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83 | static void cmd_cat( int argc , char **argv ) |
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84 | { |
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85 | char * path; |
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86 | |
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87 | if (argc != 2) |
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88 | { |
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89 | printf(" usage: cat pathname\n"); |
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90 | return; |
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91 | } |
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92 | |
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93 | path = argv[1]; |
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94 | |
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95 | printf(" error: not implemented yet\n"); |
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96 | |
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97 | /* |
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98 | // open the file |
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99 | fd = open( path , O_RDONLY , 0 ); |
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100 | if (fd < 0) |
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101 | { |
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102 | printf(" error: cannot open %s\n", path); |
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103 | goto exit; |
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104 | } |
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105 | |
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106 | // get file size |
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107 | if (stat(path, &st) == -1) |
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108 | { |
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109 | printf(" error: cannot stat %s\n", path); |
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110 | goto exit; |
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111 | } |
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112 | if (S_ISDIR(st.st_mode)) { |
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113 | printf(" error: %s is a directory\n", path); |
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114 | goto exit; |
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115 | } |
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116 | size = st.st_size; |
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117 | |
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118 | // mmap the file |
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119 | buf = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); |
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120 | if (buf == NULL || buf == (char *)-1) { |
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121 | printf(" error: cannot map %s\n", path); |
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122 | goto exit; |
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123 | } |
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124 | |
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125 | // set terminating '0' |
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126 | buf[size-1] = 0; |
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127 | |
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128 | // display the file content |
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129 | printf("%s", buf); |
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130 | |
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131 | exit: |
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132 | if (buf != NULL) munmap(buf, size); |
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133 | if (fd >= 0) close(fd); |
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134 | */ |
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135 | |
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136 | // release semaphore to get next command |
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137 | sem_post( &semaphore ); |
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138 | |
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139 | } // end cmd_cat() |
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140 | |
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141 | //////////////////////////////////////////// |
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142 | static void cmd_cd( int argc , char **argv ) |
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143 | { |
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144 | char * path; |
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145 | |
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146 | if (argc != 2) |
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147 | { |
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148 | printf(" usage: cd pathname\n"); |
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149 | return; |
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150 | } |
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151 | |
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152 | path = argv[1]; |
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153 | |
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154 | printf(" error: not implemented yet\n"); |
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155 | |
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156 | // release semaphore to get next command |
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157 | sem_post( &semaphore ); |
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158 | |
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159 | } // end cmd_cd() |
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160 | |
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161 | ///////////////////////////////////////// |
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162 | static void cmd_cp(int argc, char **argv) |
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163 | { |
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164 | // int src_fd = -1, dst_fd = -1; |
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165 | // char *srcpath, *dstpath; |
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166 | // struct stat st; |
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167 | // size_t size, i; |
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168 | // char buf[1024]; |
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169 | |
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170 | if (argc != 3) |
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171 | { |
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172 | printf(" usage: cp src_pathname dst_pathname\n"); |
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173 | return; |
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174 | } |
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175 | |
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176 | printf(" error: not implemented yet\n"); |
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177 | |
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178 | /* |
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179 | srcpath = argv[1]; |
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180 | dstpath = argv[2]; |
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181 | |
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182 | // open the src file |
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183 | src_fd = open(srcpath, O_RDONLY, 0); |
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184 | if (src_fd < 0) { |
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185 | printf(" error: cannot open %s / err = %d\n", srcpath, errno); |
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186 | goto exit; |
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187 | } |
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188 | |
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189 | // get file size |
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190 | if (stat(srcpath, &st) == -1) { |
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191 | printf(" error: cannot stat %s\n", srcpath); |
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192 | goto exit; |
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193 | } |
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194 | if (S_ISDIR(st.st_mode)) { |
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195 | printf(" error: %s is a directory\n", srcpath); |
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196 | goto exit; |
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197 | } |
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198 | size = st.st_size; |
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199 | |
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200 | // open the dst file |
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201 | dst_fd = open(dstpath, O_CREAT|O_TRUNC|O_RDWR, 0); |
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202 | if (dst_fd < 0) { |
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203 | printf(" error: cannot open %s / err = %d\n", dstpath, errno); |
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204 | goto exit; |
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205 | } |
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206 | if (stat(dstpath, &st) == -1) { |
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207 | printf(" error: cannot stat %s\n", dstpath); |
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208 | goto exit; |
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209 | } |
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210 | if (S_ISDIR(st.st_mode)) { |
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211 | printf(" error: %s is a directory\n", dstpath); |
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212 | goto exit; |
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213 | } |
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214 | |
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215 | i = 0; |
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216 | while (i < size) |
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217 | { |
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218 | size_t rlen = (size - i < 1024 ? size - i : 1024); |
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219 | size_t wlen; |
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220 | ssize_t ret; |
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221 | |
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222 | // read the source |
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223 | ret = read(src_fd, buf, rlen); |
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224 | if (ret == -1) { |
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225 | printf(" error: cannot read from file %s\n", srcpath); |
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226 | goto exit; |
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227 | } |
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228 | rlen = (size_t)ret; |
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229 | |
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230 | // write to the destination |
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231 | ret = write(dst_fd, buf, rlen); |
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232 | if (ret == -1) { |
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233 | printf(" error: cannot write to file %s\n", dstpath); |
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234 | goto exit; |
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235 | } |
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236 | wlen = (size_t)ret; |
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237 | |
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238 | // check |
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239 | if (wlen != rlen) { |
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240 | printf(" error: cannot write on device\n"); |
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241 | goto exit; |
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242 | } |
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243 | |
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244 | i += rlen; |
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245 | } |
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246 | |
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247 | exit: |
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248 | if (src_fd >= 0) close(src_fd); |
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249 | if (dst_fd >= 0) close(dst_fd); |
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250 | */ |
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251 | |
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252 | // release semaphore to get next command |
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253 | sem_post( &semaphore ); |
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254 | |
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255 | } // end cmd_cp() |
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256 | |
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257 | ///////////////////////////////////////////////// |
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258 | static void cmd_display( int argc , char **argv ) |
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259 | { |
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260 | unsigned int cxy; |
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261 | unsigned int lid; |
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262 | unsigned int pid; |
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263 | unsigned int txt_id; |
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264 | |
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265 | if( strcmp( argv[1] , "vmm" ) == 0 ) |
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266 | { |
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267 | if( argc != 4 ) |
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268 | { |
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269 | printf(" usage: display vmm cxy pid\n"); |
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270 | return; |
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271 | } |
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272 | |
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273 | cxy = atoi(argv[2]); |
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274 | pid = atoi(argv[3]); |
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275 | |
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276 | if( display_vmm( cxy , pid ) ) |
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277 | { |
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278 | printf(" error: no process %x in cluster %x\n", pid , cxy ); |
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279 | } |
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280 | } |
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281 | else if( strcmp( argv[1] , "sched" ) == 0 ) |
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282 | { |
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283 | if( argc != 4 ) |
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284 | { |
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285 | printf(" usage: display sched cxy lid\n"); |
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286 | return; |
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287 | } |
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288 | |
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289 | cxy = atoi(argv[2]); |
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290 | lid = atoi(argv[3]); |
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291 | |
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292 | if( display_sched( cxy , lid ) ) |
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293 | { |
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294 | printf(" error: illegal arguments cxy = %x / lid = %d\n", cxy, lid ); |
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295 | } |
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296 | } |
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297 | else if( strcmp( argv[1] , "process" ) == 0 ) |
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298 | { |
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299 | if( argc != 3 ) |
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300 | { |
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301 | printf(" usage: display process cxy\n"); |
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302 | return; |
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303 | } |
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304 | |
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305 | cxy = atoi(argv[2]); |
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306 | |
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307 | if( display_cluster_processes( cxy ) ) |
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308 | { |
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309 | printf(" error: illegal argument cxy = %x\n", cxy ); |
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310 | } |
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311 | } |
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312 | else if( strcmp( argv[1] , "txt" ) == 0 ) |
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313 | { |
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314 | if( argc != 3 ) |
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315 | { |
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316 | printf(" usage: display txt txt_id\n"); |
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317 | return; |
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318 | } |
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319 | |
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320 | txt_id = atoi(argv[2]); |
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321 | |
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322 | if( display_txt_processes( txt_id ) ) |
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323 | { |
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324 | printf(" error: illegal argument txt_id = %x\n", txt_id ); |
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325 | } |
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326 | } |
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327 | else if( strcmp( argv[1] , "vfs" ) == 0 ) |
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328 | { |
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329 | if( argc != 2 ) |
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330 | { |
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331 | printf(" usage: display vfs\n"); |
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332 | return; |
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333 | } |
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334 | |
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335 | display_vfs(); |
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336 | } |
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337 | else if( strcmp( argv[1] , "chdev" ) == 0 ) |
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338 | { |
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339 | if( argc != 2 ) |
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340 | { |
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341 | printf(" usage: display chdev\n"); |
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342 | return; |
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343 | } |
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344 | |
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345 | display_chdev(); |
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346 | } |
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347 | else if( strcmp( argv[1] , "dqdt" ) == 0 ) |
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348 | { |
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349 | if( argc != 2 ) |
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350 | { |
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351 | printf(" usage: display dqdt\n"); |
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352 | return; |
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353 | } |
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354 | |
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355 | display_dqdt(); |
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356 | } |
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357 | else |
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358 | { |
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359 | printf(" usage: display (vmm/sched/process/vfs/chdev/txt) [arg2] [arg3]\n"); |
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360 | } |
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361 | |
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362 | // release semaphore to get next command |
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363 | sem_post( &semaphore ); |
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364 | |
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365 | } // end cmd_display() |
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366 | |
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367 | ///////////////////////////////////////// |
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368 | static void cmd_fg(int argc, char **argv) |
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369 | { |
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370 | unsigned int pid; |
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371 | |
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372 | if (argc != 2) |
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373 | { |
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374 | printf(" usage: %s pid\n", argv[0]); |
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375 | return; |
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376 | } |
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377 | |
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378 | pid = atoi( argv[1] ); |
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379 | |
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380 | if( pid == 0 ) |
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381 | { |
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382 | printf(" error: PID cannot be 0\n" ); |
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383 | } |
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384 | |
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385 | if( fg( pid ) ) |
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386 | { |
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387 | printf(" error: cannot find process %x\n", pid ); |
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388 | } |
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389 | |
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390 | // release semaphore to get next command |
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391 | sem_post( &semaphore ); |
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392 | |
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393 | } // end cmd_fg() |
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394 | |
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395 | ////////////////////////////////////////////// |
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396 | static void cmd_help( int argc , char **argv ) |
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397 | { |
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398 | unsigned int i; |
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399 | |
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400 | if (argc != 1) |
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401 | { |
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402 | printf(" usage: %s\n", argv[0]); |
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403 | return; |
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404 | } |
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405 | |
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406 | printf("available commands:\n"); |
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407 | for (i = 0 ; cmd[i].name ; i++) |
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408 | { |
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409 | printf("\t%s\t : %s\n", cmd[i].name , cmd[i].desc); |
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410 | } |
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411 | |
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412 | // release semaphore to get next command |
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413 | sem_post( &semaphore ); |
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414 | |
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415 | } // end cmd_help() |
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416 | |
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417 | ////////////////////////////////////////////// |
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418 | static void cmd_kill( int argc , char **argv ) |
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419 | { |
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420 | unsigned int pid; |
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421 | |
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422 | if (argc != 2) |
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423 | { |
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424 | printf(" usage: %s pid\n", argv[0]); |
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425 | return; |
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426 | } |
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427 | |
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428 | pid = atoi( argv[1] ); |
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429 | |
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430 | if( pid == 0 ) |
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431 | { |
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432 | printf(" error: kernel process 0 cannot be killed\n" ); |
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433 | } |
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434 | |
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435 | if( kill( pid , SIGKILL ) ) |
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436 | { |
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437 | printf(" error: process %x cannot be killed\n", pid ); |
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438 | } |
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439 | |
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440 | // release semaphore to get next command |
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441 | sem_post( &semaphore ); |
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442 | |
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443 | } // end cmd_kill() |
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444 | |
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445 | ////////////////////////////////////////////// |
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446 | static void cmd_load( int argc , char **argv ) |
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447 | { |
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448 | int ret_fork; // return value from fork |
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449 | int ret_exec; // return value from exec |
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450 | unsigned int ksh_pid; // KSH process PID |
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451 | char * pathname; // path to .elf file |
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452 | unsigned int background; // background execution if non zero |
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453 | |
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454 | if( (argc < 2) || (argc > 3) ) |
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455 | { |
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456 | printf(" usage: %s pathname [&]\n", argv[0] ); |
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457 | return; |
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458 | } |
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459 | |
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460 | pathname = argv[1]; |
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461 | |
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462 | if( argc == 3 ) background = (argv[2][0] == '&'); |
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463 | else background = 0; |
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464 | |
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465 | // get KSH process PID |
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466 | ksh_pid = getpid(); |
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467 | |
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468 | #if KSH_DEBUG |
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469 | printf("\n[KSH_DEBUG] in %s : ksh PID %x / path %s / background %d\n", |
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470 | __FUNCTION__, ksh_pid, argv[1], background ); |
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471 | #endif |
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472 | |
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473 | // KSH process fork CHILD process |
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474 | ret_fork = fork(); |
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475 | |
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476 | if ( ret_fork < 0 ) // it is a failure reported to KSH |
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477 | { |
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478 | printf(" error: ksh process unable to fork\n"); |
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479 | return; |
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480 | } |
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481 | else if (ret_fork == 0) // it is the CHILD process |
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482 | { |
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483 | // CHILD process exec NEW process |
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484 | ret_exec = execve( pathname , NULL , NULL ); |
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485 | |
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486 | // this is only executed in case of exec failure |
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487 | if( ret_exec ) |
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488 | { |
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489 | printf(" error: child process unable to exec <%s>\n", pathname ); |
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490 | exit( 0 ); |
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491 | } |
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492 | } |
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493 | else // it is the KSH process : ret_fork is the new process PID |
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494 | { |
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495 | |
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496 | #if KSH_DEBUG |
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497 | int sem_value; |
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498 | sem_getvalue( &semaphore , &sem_value ); |
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499 | printf("\n[KSH_DEBUG] in %s : child PID %x / background %d / sem_value %d\n", |
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500 | ret_fork, background, sem_value ); |
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501 | #endif |
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502 | |
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503 | if( background ) // child in background => KSH keeps TXT ownership |
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504 | { |
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505 | // execve() tranfered TXT ownership to child => give it back to KSH |
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506 | fg( ksh_pid ); |
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507 | |
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508 | // release semaphore to get next command |
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509 | sem_post( &semaphore ); |
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510 | } |
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511 | } |
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512 | } // end cmd_load |
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513 | |
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514 | ///////////////////////////////////////////// |
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515 | static void cmd_log( int argc , char **argv ) |
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516 | { |
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517 | unsigned int i; |
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518 | |
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519 | printf("--- registered commands ---\n"); |
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520 | for (i = 0; i < LOG_DEPTH; i++) |
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521 | { |
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522 | printf(" - %d\t: %s\n", i, &log_entries[i].buf); |
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523 | } |
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524 | |
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525 | // release semaphore to get next command |
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526 | sem_post( &semaphore ); |
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527 | |
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528 | } // end cmd_log() |
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529 | |
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530 | |
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531 | //////////////////////////////////////////// |
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532 | static void cmd_ls( int argc , char **argv ) |
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533 | { |
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534 | char * path; |
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535 | |
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536 | // struct dirent * file; |
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537 | // DIR *dir; |
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538 | |
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539 | if (argc == 1) |
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540 | { |
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541 | path = "."; |
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542 | } |
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543 | else if (argc == 2) |
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544 | { |
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545 | path = argv[1]; |
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546 | } |
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547 | else |
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548 | { |
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549 | printf(" usage: ls [path]\n"); |
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550 | return; |
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551 | } |
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552 | |
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553 | printf(" error: not implemented yet\n"); |
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554 | /* |
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555 | dir = opendir( path ); |
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556 | while ((file = readdir(dir)) != NULL) |
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557 | { |
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558 | printf(" %s\n", file->d_name); |
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559 | } |
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560 | closedir(dir); |
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561 | */ |
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562 | |
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563 | // release semaphore to get next command |
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564 | sem_post( &semaphore ); |
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565 | |
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566 | } // end cmd_ls() |
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567 | |
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568 | /////////////////////////////////////////////// |
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569 | static void cmd_mkdir( int argc , char **argv ) |
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570 | { |
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571 | char * pathname; |
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572 | |
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573 | if (argc != 2) |
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574 | { |
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575 | printf(" usage: mkdir pathname\n"); |
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576 | return; |
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577 | } |
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578 | |
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579 | pathname = argv[1]; |
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580 | |
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581 | printf(" error: not implemented yet\n"); |
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582 | |
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583 | // release semaphore to get next command |
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584 | sem_post( &semaphore ); |
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585 | |
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586 | } // end cmd_mkdir() |
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587 | |
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588 | //////////////////////////////////////////// |
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589 | static void cmd_mv( int argc , char **argv ) |
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590 | { |
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591 | |
---|
592 | if (argc < 3) |
---|
593 | { |
---|
594 | printf(" usage : %s src_pathname dst_pathname\n", argv[0]); |
---|
595 | return; |
---|
596 | } |
---|
597 | |
---|
598 | printf(" error: not implemented yet\n"); |
---|
599 | |
---|
600 | // release semaphore to get next command |
---|
601 | sem_post( &semaphore ); |
---|
602 | |
---|
603 | } // end cmd_mv |
---|
604 | |
---|
605 | ///////////////////////////////////////////// |
---|
606 | static void cmd_pwd( int argc , char **argv ) |
---|
607 | { |
---|
608 | char buf[1024]; |
---|
609 | |
---|
610 | if (argc != 1) |
---|
611 | { |
---|
612 | printf(" usage: pwd\n"); |
---|
613 | return; |
---|
614 | } |
---|
615 | |
---|
616 | if ( getcwd( buf , 1024 ) ) |
---|
617 | { |
---|
618 | printf(" error: unable to get current directory\n"); |
---|
619 | } |
---|
620 | else |
---|
621 | { |
---|
622 | printf("%s\n", buf); |
---|
623 | } |
---|
624 | |
---|
625 | // release semaphore to get next command |
---|
626 | sem_post( &semaphore ); |
---|
627 | |
---|
628 | } // end cmd_pwd() |
---|
629 | |
---|
630 | //////////////////////////////////////////// |
---|
631 | static void cmd_rm( int argc , char **argv ) |
---|
632 | { |
---|
633 | char * pathname; |
---|
634 | |
---|
635 | if (argc != 2) |
---|
636 | { |
---|
637 | printf(" usage: rm pathname\n"); |
---|
638 | return; |
---|
639 | } |
---|
640 | |
---|
641 | pathname = argv[1]; |
---|
642 | |
---|
643 | printf(" error: not implemented yet\n"); |
---|
644 | |
---|
645 | // release semaphore to get next command |
---|
646 | sem_post( &semaphore ); |
---|
647 | |
---|
648 | } // end_cmd_rm() |
---|
649 | |
---|
650 | /////////////////////////////////////////////// |
---|
651 | static void cmd_rmdir( int argc , char **argv ) |
---|
652 | { |
---|
653 | // same as cmd_rm() |
---|
654 | cmd_rm(argc, argv); |
---|
655 | } |
---|
656 | |
---|
657 | /////////////////////////////////////////////// |
---|
658 | static void cmd_trace( int argc , char **argv ) |
---|
659 | { |
---|
660 | unsigned int cxy; |
---|
661 | unsigned int lid; |
---|
662 | |
---|
663 | if (argc != 3) |
---|
664 | { |
---|
665 | printf(" usage: trace cxy lid \n"); |
---|
666 | return; |
---|
667 | } |
---|
668 | |
---|
669 | cxy = atoi(argv[1]); |
---|
670 | lid = atoi(argv[2]); |
---|
671 | |
---|
672 | if( trace( 1 , cxy , lid ) ) |
---|
673 | { |
---|
674 | printf(" error: core[%x,%d] not found\n", cxy, lid ); |
---|
675 | } |
---|
676 | |
---|
677 | // release semaphore to get next command |
---|
678 | sem_post( &semaphore ); |
---|
679 | |
---|
680 | } // end cmd_trace |
---|
681 | |
---|
682 | /////////////////////////////////////////////// |
---|
683 | static void cmd_untrace( int argc , char **argv ) |
---|
684 | { |
---|
685 | unsigned int cxy; |
---|
686 | unsigned int lid; |
---|
687 | |
---|
688 | if (argc != 3) |
---|
689 | { |
---|
690 | printf(" usage: untrace cxy lid \n"); |
---|
691 | return; |
---|
692 | } |
---|
693 | |
---|
694 | cxy = atoi(argv[1]); |
---|
695 | lid = atoi(argv[2]); |
---|
696 | |
---|
697 | if( trace( 0 , cxy , lid ) ) |
---|
698 | { |
---|
699 | printf(" error: core[%x,%d] not found\n", cxy, lid ); |
---|
700 | } |
---|
701 | |
---|
702 | // release semaphore to get next command |
---|
703 | sem_post( &semaphore ); |
---|
704 | |
---|
705 | } // end cmd_untrace() |
---|
706 | |
---|
707 | /////////////////////////////////////////////////////////////////////////////////// |
---|
708 | // Array of commands |
---|
709 | /////////////////////////////////////////////////////////////////////////////////// |
---|
710 | |
---|
711 | ksh_cmd_t cmd[] = |
---|
712 | { |
---|
713 | { "cat", "display file content", cmd_cat }, |
---|
714 | { "cd", "change current directory", cmd_cd }, |
---|
715 | { "cp", "replicate a file in file system", cmd_cp }, |
---|
716 | { "fg", "put a process in foreground", cmd_fg }, |
---|
717 | { "display", "display vmm/sched/process/vfs/chdev/txt", cmd_display }, |
---|
718 | { "load", "load an user application", cmd_load }, |
---|
719 | { "help", "list available commands", cmd_help }, |
---|
720 | { "kill", "kill a process (all threads)", cmd_kill }, |
---|
721 | { "log", "list registered commands", cmd_log }, |
---|
722 | { "ls", "list directory entries", cmd_ls }, |
---|
723 | { "mkdir", "create a new directory", cmd_mkdir }, |
---|
724 | { "mv", "move a file in file system", cmd_mv }, |
---|
725 | { "pwd", "print current working directory", cmd_pwd }, |
---|
726 | { "rm", "remove a file from file system", cmd_rm }, |
---|
727 | { "rmdir", "remove a directory from file system", cmd_rmdir }, |
---|
728 | { "trace", "activate trace for a given core", cmd_trace }, |
---|
729 | { "untrace", "desactivate trace for a given core", cmd_untrace }, |
---|
730 | { NULL, NULL, NULL } |
---|
731 | }; |
---|
732 | |
---|
733 | //////////////////////////////////////////////////////////////////////////////////// |
---|
734 | // This function analyses one command (with arguments), executes it, and returns. |
---|
735 | //////////////////////////////////////////////////////////////////////////////////// |
---|
736 | static void parse( char * buf ) |
---|
737 | { |
---|
738 | int argc = 0; |
---|
739 | char *argv[MAX_ARGS]; |
---|
740 | int i; |
---|
741 | int len = strlen(buf); |
---|
742 | |
---|
743 | // build argc/argv |
---|
744 | for (i = 0; i < len; i++) |
---|
745 | { |
---|
746 | if (buf[i] == ' ') |
---|
747 | { |
---|
748 | buf[i] = '\0'; |
---|
749 | } |
---|
750 | else if (i == 0 || buf[i - 1] == '\0') |
---|
751 | { |
---|
752 | if (argc < MAX_ARGS) |
---|
753 | { |
---|
754 | argv[argc] = &buf[i]; |
---|
755 | argc++; |
---|
756 | } |
---|
757 | } |
---|
758 | } |
---|
759 | |
---|
760 | if (argc > 0) |
---|
761 | { |
---|
762 | int found = 0; |
---|
763 | |
---|
764 | argv[argc] = NULL; |
---|
765 | |
---|
766 | // try to match typed command |
---|
767 | for (i = 0; cmd[i].name; i++) |
---|
768 | { |
---|
769 | if (strcmp(argv[0], cmd[i].name) == 0) |
---|
770 | { |
---|
771 | cmd[i].fn(argc, argv); |
---|
772 | found = 1; |
---|
773 | break; |
---|
774 | } |
---|
775 | } |
---|
776 | |
---|
777 | if (!found) // undefined command |
---|
778 | { |
---|
779 | printf(" error : undefined command <%s>\n", argv[0]); |
---|
780 | |
---|
781 | // release semaphore to get next command |
---|
782 | sem_post( &semaphore ); |
---|
783 | } |
---|
784 | } |
---|
785 | } // end parse() |
---|
786 | |
---|
787 | ///////////////////////// |
---|
788 | static void interactive() |
---|
789 | { |
---|
790 | char c; // read character |
---|
791 | char buf[CMD_MAX_SIZE]; // buffer for one command |
---|
792 | unsigned int end_command; // last character found in a command |
---|
793 | unsigned int count; // pointer in command buffer |
---|
794 | unsigned int i; // index for loops |
---|
795 | unsigned int state; // escape sequence state |
---|
796 | |
---|
797 | char string[80]; |
---|
798 | |
---|
799 | enum fsm_states |
---|
800 | { |
---|
801 | NORMAL = 0, |
---|
802 | ESCAPE = 1, |
---|
803 | BRAKET = 2, |
---|
804 | }; |
---|
805 | |
---|
806 | // This lexical analyser writes one command line in the command buffer. |
---|
807 | // It is implemented as a 3 states FSM to handle the following escape sequences: |
---|
808 | // - ESC [ A : up arrow |
---|
809 | // - ESC [ B : down arrow |
---|
810 | // - ESC [ C : right arrow |
---|
811 | // - ESC [ D : left arrow |
---|
812 | // The three states have the following semantic: |
---|
813 | // - NORMAL : no (ESC) character has been found |
---|
814 | // - ESCAPE : the character (ESC) has been found |
---|
815 | // - BRAKET : the wo characters (ESC,[) have been found |
---|
816 | |
---|
817 | // external loop on the commands |
---|
818 | // the in teractive thread should not exit this loop |
---|
819 | while (1) |
---|
820 | { |
---|
821 | // initialize command buffer |
---|
822 | memset( buf, 0x20 , sizeof(buf) ); // TODO useful ? |
---|
823 | count = 0; |
---|
824 | state = NORMAL; |
---|
825 | |
---|
826 | // block if the KSH process is not the TXT owner |
---|
827 | // - if the command is not a "load" |
---|
828 | // the semaphore must be released by the cmd_***() |
---|
829 | // - if the command is a load, it depends on |
---|
830 | // the "background" argument |
---|
831 | sem_wait( &semaphore ); |
---|
832 | |
---|
833 | // display prompt on a new line |
---|
834 | printf("\n[ksh] "); |
---|
835 | |
---|
836 | end_command = 0; |
---|
837 | |
---|
838 | // internal loop on characters in one command |
---|
839 | while( end_command == 0 ) |
---|
840 | { |
---|
841 | // get one character from TXT_RX |
---|
842 | c = (char)getchar(); |
---|
843 | |
---|
844 | if( c == 0 ) continue; |
---|
845 | |
---|
846 | if( state == NORMAL ) // we are not in an escape sequence |
---|
847 | { |
---|
848 | if ((c == '\b') || (c == 0x7F)) // backspace => remove one character |
---|
849 | { |
---|
850 | if (count > 0) |
---|
851 | { |
---|
852 | printf("\b \b"); |
---|
853 | count--; |
---|
854 | } |
---|
855 | } |
---|
856 | else if (c == '\n') // new line => end of command |
---|
857 | { |
---|
858 | if (count > 0) // analyse & execute command |
---|
859 | { |
---|
860 | // complete command with NUL character |
---|
861 | buf[count] = 0; |
---|
862 | count++; |
---|
863 | |
---|
864 | // register command in log arrays |
---|
865 | strcpy(log_entries[ptw].buf, buf); |
---|
866 | log_entries[ptw].count = count; |
---|
867 | ptw = (ptw + 1) % LOG_DEPTH; |
---|
868 | ptr = ptw; |
---|
869 | |
---|
870 | // echo character |
---|
871 | putchar( c ); |
---|
872 | |
---|
873 | // call parser to analyse and execute command |
---|
874 | parse( buf ); |
---|
875 | } |
---|
876 | else // no command registered |
---|
877 | { |
---|
878 | // release semaphore to get next command |
---|
879 | sem_post( &semaphore ); |
---|
880 | } |
---|
881 | |
---|
882 | // exit internal loop on characters |
---|
883 | end_command = 1; |
---|
884 | } |
---|
885 | else if (c == '\t') // tabulation => do nothing |
---|
886 | { |
---|
887 | } |
---|
888 | else if (c == (char)0x1B) // ESC => start an escape sequence |
---|
889 | { |
---|
890 | state = ESCAPE; |
---|
891 | } |
---|
892 | else // normal character |
---|
893 | { |
---|
894 | if (count < sizeof(buf) - 1) |
---|
895 | { |
---|
896 | // register character in command buffer |
---|
897 | buf[count] = c; |
---|
898 | count++; |
---|
899 | |
---|
900 | // echo character |
---|
901 | putchar( c ); |
---|
902 | } |
---|
903 | } |
---|
904 | } |
---|
905 | else if( state == ESCAPE ) |
---|
906 | { |
---|
907 | if (c == '[') // valid sequence => continue |
---|
908 | { |
---|
909 | state = BRAKET; |
---|
910 | } |
---|
911 | else // invalid sequence => do nothing |
---|
912 | { |
---|
913 | state = NORMAL; |
---|
914 | } |
---|
915 | } |
---|
916 | else if( state == BRAKET ) |
---|
917 | { |
---|
918 | if (c == 'D') // valid LEFT sequence => move buf pointer left |
---|
919 | { |
---|
920 | if (count > 0) |
---|
921 | { |
---|
922 | printf("\b"); |
---|
923 | count--; |
---|
924 | } |
---|
925 | |
---|
926 | // get next user char |
---|
927 | state = NORMAL; |
---|
928 | } |
---|
929 | else if (c == 'C') // valid RIGHT sequence => move buf pointer right |
---|
930 | { |
---|
931 | if (count < sizeof(buf) - 1) |
---|
932 | { |
---|
933 | printf("%c", buf[count]); |
---|
934 | count++; |
---|
935 | } |
---|
936 | |
---|
937 | // get next user char |
---|
938 | state = NORMAL; |
---|
939 | } |
---|
940 | else if (c == 'A') // valid UP sequence => move log pointer backward |
---|
941 | { |
---|
942 | // cancel current command |
---|
943 | for (i = 0; i < count; i++) printf("\b \b"); |
---|
944 | count = 0; |
---|
945 | |
---|
946 | // copy log command into buf |
---|
947 | ptr = (ptr - 1) % LOG_DEPTH; |
---|
948 | strcpy(buf, log_entries[ptr].buf); |
---|
949 | count = log_entries[ptr].count; |
---|
950 | |
---|
951 | // display log command |
---|
952 | printf("%s", buf); |
---|
953 | |
---|
954 | // get next user char |
---|
955 | state = NORMAL; |
---|
956 | } |
---|
957 | else if (c == 'B') // valid DOWN sequence => move log pointer forward |
---|
958 | { |
---|
959 | // cancel current command |
---|
960 | for (i = 0 ; i < count; i++) printf("\b \b"); |
---|
961 | count = 0; |
---|
962 | |
---|
963 | // copy log command into buf |
---|
964 | ptr = (ptr + 1) % LOG_DEPTH; |
---|
965 | strcpy(buf, log_entries[ptr].buf); |
---|
966 | count = log_entries[ptr].count; |
---|
967 | |
---|
968 | // display log command |
---|
969 | printf("%s", buf); |
---|
970 | |
---|
971 | // get next user char |
---|
972 | state = NORMAL; |
---|
973 | } |
---|
974 | else // other character => do nothing |
---|
975 | { |
---|
976 | // get next user char |
---|
977 | state = NORMAL; |
---|
978 | } |
---|
979 | } |
---|
980 | } // end internal while loop on characters |
---|
981 | } // end external while loop on commands |
---|
982 | } // end interactive() |
---|
983 | |
---|
984 | /////////////////////////////////// |
---|
985 | int main( int argc , char *argv[] ) |
---|
986 | { |
---|
987 | unsigned int cxy; // owner cluster identifier for this KSH process |
---|
988 | unsigned int lid; // core identifier for this KSH main thread |
---|
989 | int status; // child process termination status |
---|
990 | int child_pid; // child process identifier |
---|
991 | int parent_pid; // parent process identifier |
---|
992 | pthread_t trdid; // kernel allocated index for interactive thread |
---|
993 | unsigned int is_owner; // non-zero if KSH process is TXT owner |
---|
994 | |
---|
995 | // initialize log buffer |
---|
996 | memset( &log_entries , 0, sizeof(log_entries)); |
---|
997 | ptw = 0; |
---|
998 | ptr = 0; |
---|
999 | |
---|
1000 | // get KSH process pid and core |
---|
1001 | parent_pid = getpid(); |
---|
1002 | get_core( &cxy , & lid ); |
---|
1003 | |
---|
1004 | printf( "\n\n~~~ KSH on core[%x,%d] ~~~\n\n", cxy , lid ); |
---|
1005 | |
---|
1006 | // initializes the semaphore used to unblock the interactive thread |
---|
1007 | sem_init( &semaphore , 0 , 1 ); |
---|
1008 | |
---|
1009 | // initialize interactive thread attributes |
---|
1010 | attr.attributes = PT_ATTR_DETACH | PT_ATTR_CLUSTER_DEFINED; |
---|
1011 | attr.cxy = cxy; |
---|
1012 | |
---|
1013 | // lauch the interactive thread |
---|
1014 | pthread_create( &trdid, |
---|
1015 | &attr, |
---|
1016 | &interactive, // entry function |
---|
1017 | NULL ); |
---|
1018 | |
---|
1019 | // enter infinite loop monitoring children processes termination |
---|
1020 | while( 1 ) |
---|
1021 | { |
---|
1022 | // wait children termination |
---|
1023 | child_pid = wait( &status ); |
---|
1024 | |
---|
1025 | #if KSH_DEBUG |
---|
1026 | if( WIFEXITED (status) ) printf("\n[KSH] child process %x exited\n" , child_pid ); |
---|
1027 | if( WIFSIGNALED(status) ) printf("\n[KSH] child process %x killed\n" , child_pid ); |
---|
1028 | if( WIFSTOPPED (status) ) printf("\n[KSH] child process %x stopped\n", child_pid ); |
---|
1029 | #endif |
---|
1030 | |
---|
1031 | // release semaphore if KSH process is TXT owner, to unblock interactive thread |
---|
1032 | is_fg( parent_pid , &is_owner ); |
---|
1033 | if( is_owner ) sem_post( &semaphore ); |
---|
1034 | |
---|
1035 | } |
---|
1036 | } // end main() |
---|
1037 | |
---|
1038 | |
---|