--- a/src/impl/PipeRead.cbc	Sun Dec 15 13:43:23 2019 +0900
+++ b/src/impl/PipeRead.cbc	Sun Dec 15 13:57:57 2019 +0900
@@ -26,7 +26,7 @@
     pipe_read->cbc_piperead1 = C_cbc_piperead1PipeRead;
     pipe_read->cbc_piperead2 = C_cbc_piperead2PipeRead;
     pipe_read->cbc_piperead3 = C_cbc_piperead3PipeRead;
-    pipe_read->next = C_nextPipeRead;
+    //pipe_read->next = C_nextPipeRead;
     sys_read->read = C_readPipeRead;
     sys_read->next = C_nextPipeRead;
     return sys_read;
@@ -36,34 +36,49 @@
     struct SysRead* sys_read  = new SysRead();
     struct PipeRead* pipe_read = new PipeRead();
     sys_read->sys_read = (union Data*)pipe_read;
+
     pipe_read->p = p;
-    pipe_read->i  = 0;
-    pipe_read->n  = n;
+    pipe_read->i = 0;
+    pipe_read->n = n;
+
     sys_read->impl = (union Data*)p;
     sys_read->addr = addr;
-    sys_read->n  = n;
+    sys_read->n    = n;
+
+    pipe_read->cbc_piperead1 = C_cbc_piperead1PipeRead;
+    pipe_read->cbc_piperead2 = C_cbc_piperead2PipeRead;
+    pipe_read->cbc_piperead3 = C_cbc_piperead3PipeRead;
+    //pipe_read->next          = C_nextPipeRead;
+
     sys_read->read = C_readPipeRead;
     sys_read->next = C_nextPipeRead;
     return sys_read;
 }
 
-__code cbc_piperead1PipeRead(struct PipeRead* sys_read, struct pipe* p, __code next(...)) {
-
-  goto next(...);
+__code cbc_piperead1PipeRead(struct PipeRead* sys_read, struct pipe* p, __code error(int err), __code next(int i, p,...)) {
+   if (p->nread == p->nwrite && p->writeopen){
+     if(proc->killed){
+         release(&p->lock);
+         goto error(-1);
+     }
+     goto cbc_sleep(&p->nread, &p->lock, cbc_piperead1);
+   }
+  goto next(i,p,...);
 }
 
-__code cbc_piperead2PipeRead(struct PipeRead* sys_read, int i, int n, struct pipe* p, __code next(...)) {
-
+__code cbc_piperead2PipeRead(struct PipeRead* sys_read, int i, int n, struct pipe* p,char* addr, __code next(...)) {
+  if (i < n && !(p->nread == p->nwrite)) {
+      addr[i] = p->data[p->nread++ % PIPESIZE];
+      i++;
+      goto sys_read->cbc_piperead2(i,n,p,addr,cbc_wakeup);
+  }
+  goto cbc_wakeup(&p->nwrite, cbc_piperead3);  //DOC: piperead-wakeup
   goto next(...);
 }
 
 __code cbc_piperead3PipeRead(struct PipeRead* sys_read, int i, struct pipe* p, __code next(...)) {
-
-  goto next(...);
-}
-
-__code nextPipeRead(...) {
-
+  release(&p->lock);
+  goto sys_read->ret(i,...);
 }
 
 __code readPipeRead(struct PipeRead* sys_read, union Data* impl, char* addr, int n, __code next(int ret,...)) {
@@ -71,7 +86,4 @@
   goto next(int ret,...);
 }
 
-__code nextPipeRead(...) {
 
-}
-