add Getwd, Fchdir, tests

R=r
DELTA=215  (186 added, 0 deleted, 29 changed)
OCL=28968
CL=28995

1 files changed, 15 insertions, 0 deletions

diff --git a/src/lib/syscall/file_darwin.go b/src/lib/syscall/file_darwin.go
index e3c9567e3..6c4eee6fb 100644
--- a/src/lib/syscall/file_darwin.go
+++ b/src/lib/syscall/file_darwin.go
@@ -111,6 +111,11 @@ func Chdir(dir string) (ret, errno int64) {
 	return r1, err;
 }
 
+func Fchdir(fd int64) (ret, errno int64) {
+	r1, r2, err := Syscall(SYS_FCHDIR, fd, 0, 0);
+	return r1, err;
+}
+
 func Link(oldname, newname string) (ret, errno int64) {
 	oldbuf := StringBytePtr(oldname);
 	newbuf := StringBytePtr(newname);
@@ -169,3 +174,13 @@ func Ftruncate(fd, length int64) (ret, errno int64) {
 	r1, r2, err := Syscall(SYS_FTRUNCATE, fd, length, 0);
 	return r1, err;
 }
+
+// The const provides a compile-time constant so clients
+// can adjust to whether there is a working Getwd and avoid
+// even linking this function into the binary.  See ../os/getwd.go.
+const ImplementsGetwd = false
+
+func Getwd() (string, int64) {
+	return "", ENOTSUP;
+}
+