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0
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1 #include "types.h"
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2 #include "defs.h"
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3 #include "param.h"
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4 #include "mmu.h"
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5 #include "proc.h"
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6 #include "fs.h"
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7 #include "file.h"
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8 #include "spinlock.h"
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9
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10 #define PIPESIZE 512
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11
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52
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12 #define __ncode __code
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13 #
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154
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14 /*
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0
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15 struct pipe {
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16 struct spinlock lock;
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17 char data[PIPESIZE];
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18 uint nread; // number of bytes read
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19 uint nwrite; // number of bytes written
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20 int readopen; // read fd is still open
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21 int writeopen; // write fd is still open
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22 };
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154
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23 */
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0
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24
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25 int pipealloc(struct file **f0, struct file **f1)
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26 {
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27 struct pipe *p;
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28
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29 p = 0;
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30 *f0 = *f1 = 0;
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31
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32 if((*f0 = filealloc()) == 0 || (*f1 = filealloc()) == 0) {
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33 goto bad;
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34 }
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35
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36 if((p = kmalloc (get_order(sizeof(*p)))) == 0) {
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37 goto bad;
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38 }
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39
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40 p->readopen = 1;
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41 p->writeopen = 1;
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42 p->nwrite = 0;
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43 p->nread = 0;
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44
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45 initlock(&p->lock, "pipe");
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46
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47 (*f0)->type = FD_PIPE;
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48 (*f0)->readable = 1;
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49 (*f0)->writable = 0;
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50 (*f0)->pipe = p;
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51 (*f1)->type = FD_PIPE;
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52 (*f1)->readable = 0;
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53 (*f1)->writable = 1;
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54 (*f1)->pipe = p;
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55
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56 return 0;
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57
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58 //PAGEBREAK: 20
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59 bad:
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60 if(p) {
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61 kfree (p, get_order(sizeof*p));
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62 }
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63
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64 if(*f0) {
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65 fileclose(*f0);
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66 }
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67
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68 if(*f1) {
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69 fileclose(*f1);
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70 }
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71
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72 return -1;
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73 }
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74
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75 void pipeclose(struct pipe *p, int writable)
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76 {
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77 acquire(&p->lock);
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78
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79 if(writable){
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80 p->writeopen = 0;
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81 wakeup(&p->nread);
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82
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83 } else {
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84 p->readopen = 0;
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85 wakeup(&p->nwrite);
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86 }
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87
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88 if(p->readopen == 0 && p->writeopen == 0){
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89 release(&p->lock);
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90 kfree (p, get_order(sizeof(*p)));
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91
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92 } else {
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93 release(&p->lock);
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94 }
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95 }
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96
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97 //PAGEBREAK: 40
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98 int pipewrite(struct pipe *p, char *addr, int n)
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99 {
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100 int i;
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101
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102 acquire(&p->lock);
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103
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104 for(i = 0; i < n; i++){
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105 while(p->nwrite == p->nread + PIPESIZE){ //DOC: pipewrite-full
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106 if(p->readopen == 0 /*|| proc->killed*/){
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107 release(&p->lock);
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108 return -1;
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109 }
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110
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111 wakeup(&p->nread);
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112 sleep(&p->nwrite, &p->lock); //DOC: pipewrite-sleep
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113 }
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114
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115 p->data[p->nwrite++ % PIPESIZE] = addr[i];
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116 }
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117
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118 wakeup(&p->nread); //DOC: pipewrite-wakeup1
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119 release(&p->lock);
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120 return n;
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121 }
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122
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52
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123 __ncode cbc_piperead3(){
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36
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124 struct pipe *p = proc->cbc_arg.cbc_console_arg.p;
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125 int i = proc->cbc_arg.cbc_console_arg.i;
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37
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126 __code(*next)(int ret) = proc->cbc_arg.cbc_console_arg.next;
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36
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127 release(&p->lock);
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128
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129 goto next(i);
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130 }
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35
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131
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52
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132 __ncode cbc_piperead2(){
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36
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133 int i = proc->cbc_arg.cbc_console_arg.i;
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134 int n = proc->cbc_arg.cbc_console_arg.n;
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135 struct pipe *p = proc->cbc_arg.cbc_console_arg.p;
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136 char *addr = proc->cbc_arg.cbc_console_arg.addr;
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37
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137 if (i < n && !(p->nread == p->nwrite)) {
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36
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138 addr[i] = p->data[p->nread++ % PIPESIZE];
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139 i ++;
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140 proc->cbc_arg.cbc_console_arg.i = i;
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141 proc->cbc_arg.cbc_console_arg.p = p;
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142 proc->cbc_arg.cbc_console_arg.addr = addr;
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143 goto cbc_piperead2();
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144 }
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145 proc->cbc_arg.cbc_console_arg.p = p;
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146 goto cbc_wakeup(&p->nwrite, cbc_piperead3); //DOC: piperead-wakeup
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147 }
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35
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148
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113
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149 __ncode cbc_piperead1(){
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150 struct pipe *p = proc->cbc_arg.cbc_console_arg.p;
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37
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151 __code(*next)(int ret) = proc->cbc_arg.cbc_console_arg.next;
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113
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152 if (p->nread == p->nwrite && p->writeopen){
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35
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153 if(proc->killed){
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113
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154 release(&p->lock);
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35
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155 goto next(-1);
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156 }
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113
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157 proc->cbc_arg.cbc_console_arg.p = p;
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158 goto cbc_sleep(&p->nread, &p->lock, cbc_piperead1);
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35
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159 }
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36
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160 int i = 0;
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113
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161 proc->cbc_arg.cbc_console_arg.i = i;
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162 proc->cbc_arg.cbc_console_arg.p = p;
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36
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163 goto cbc_piperead2();
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164 }
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35
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165
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113
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166 __ncode cbc_piperead(struct pipe *p, char *addr, int n, __code (*next)(int ret))
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36
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167 {
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168 acquire(&p->lock);
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113
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169 proc->cbc_arg.cbc_console_arg.n = n;
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170 proc->cbc_arg.cbc_console_arg.p = p;
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171 proc->cbc_arg.cbc_console_arg.addr = addr;
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172 proc->cbc_arg.cbc_console_arg.next = next;
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36
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173 goto cbc_piperead1();
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174 }
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35
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175
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0
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176 int piperead(struct pipe *p, char *addr, int n)
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177 {
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178 int i;
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179
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180 acquire(&p->lock);
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181
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182 while(p->nread == p->nwrite && p->writeopen){ //DOC: pipe-empty
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183 if(proc->killed){
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184 release(&p->lock);
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185 return -1;
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186 }
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187
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188 sleep(&p->nread, &p->lock); //DOC: piperead-sleep*/
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189 }
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190
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191 for(i = 0; i < n; i++){ //DOC: piperead-copy
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192 if(p->nread == p->nwrite) {
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193 break;
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194 }
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195
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196 addr[i] = p->data[p->nread++ % PIPESIZE];
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197 }
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198
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199 wakeup(&p->nwrite); //DOC: piperead-wakeup
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200 release(&p->lock);
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201
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202 return i;
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203 }
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