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, 2 insertions, 0 deletions

diff --git a/usys.S b/usys.S
index c7a162c..617fdc5 100644
--- a/usys.S
+++ b/usys.S
@@ -25,3 +25,5 @@ STUB(link)
 STUB(mkdir)
 STUB(chdir)
 STUB(dup)
+STUB(getpid)
+STUB(sbrk)