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