my solution to lab5

lab/user/icode.c

@@ -0,0 +1,29 @@
+#include <inc/lib.h>
+
+void
+umain(int argc, char **argv)
+{
+	int fd, n, r;
+	char buf[512+1];
+
+	binaryname = "icode";
+
+	cprintf("icode startup\n");
+
+	cprintf("icode: open /motd\n");
+	if ((fd = open("/motd", O_RDONLY)) < 0)
+		panic("icode: open /motd: %e", fd);
+
+	cprintf("icode: read /motd\n");
+	while ((n = read(fd, buf, sizeof buf-1)) > 0)
+		sys_cputs(buf, n);
+
+	cprintf("icode: close /motd\n");
+	close(fd);
+
+	cprintf("icode: spawn /init\n");
+	if ((r = spawnl("/init", "init", "initarg1", "initarg2", (char*)0)) < 0)
+		panic("icode: spawn /init: %e", r);
+
+	cprintf("icode: exiting\n");
+}