my solution to lab 6

lab/net/input.c

@@ -0,0 +1,53 @@
+#include "ns.h"
+#include <kern/e1000.h>
+
+
+extern union Nsipc nsipcbuf;
+
+
+void
+sleep(int msec)
+{
+	unsigned now = sys_time_msec();
+	unsigned end = now + msec;
+
+	if ((int)now < 0 && (int)now > -MAXERROR)
+		panic("sys_time_msec: %e", (int)now);
+	if (end < now)
+		panic("sleep: wrap");
+
+	while (sys_time_msec() < end)
+		sys_yield();
+}
+
+
+
+
+void
+input(envid_t ns_envid)
+{
+	binaryname = "ns_input";
+
+	// LAB 6: Your code here:
+	// 	- read a packet from the device driver
+	//	- send it to the network server
+	// Hint: When you IPC a page to the network server, it will be
+	// reading from it for a while, so don't immediately receive
+	// another packet in to the same physical page.
+	size_t len;
+	char rev_buf[RX_PACKET_SIZE];
+	size_t i = 0;
+	while(1) {
+		// 阻塞式读
+		while ( sys_pkt_try_receive(rev_buf, &len)  < 0) {
+			sys_yield();	
+		}
+		memcpy(nsipcbuf.pkt.jp_data, rev_buf, len);
+		nsipcbuf.pkt.jp_len = len;
+		
+		ipc_send(ns_envid, NSREQ_INPUT, &nsipcbuf, PTE_P|PTE_U);
+		sleep(50);
+	}
+	
+}
+