i/o redirection in sh

better parsing of sh commands (copied from jos sh)
cat: read from 1 if no args
sbrk system call, but untested
getpid system call
moved locks in keyboard intr, but why do we get intr w. null characters from keyboard?

1 files changed, 1 insertions, 1 deletions

diff --git a/lapic.c b/lapic.c
index 161d0a5..0d389f1 100644
--- a/lapic.c
+++ b/lapic.c
@@ -120,7 +120,7 @@ lapic_timerinit(void)
 void
 lapic_timerintr(void)
 {
-  cprintf("cpu%d: timer interrupt!\n", cpu());
+  // cprintf("cpu%d: timer interrupt!\n", cpu());
   lapic_write (LAPIC_EOI, 0);
 }