Add extra argument to substitute_hook_functions and interpose_imports for use with unhooking.

I think we'll need to explicitly record trampoline locations to avoid
the possibility of stomping on someone else's stuff if the function was
re-patched...

Also, document substitute_hook_functions.

1 files changed, 2 insertions, 1 deletions

diff --git a/darwin-bootstrap/posixspawn-hook.c b/darwin-bootstrap/posixspawn-hook.c
index b467ca5..51ab5b3 100644
--- a/darwin-bootstrap/posixspawn-hook.c
+++ b/darwin-bootstrap/posixspawn-hook.c
@@ -425,7 +425,8 @@ static void init() {
         {"_sandbox_check", hook_sandbox_check, &old_sandbox_check},
     };
 
-    int err = substitute_interpose_imports(im, hooks, sizeof(hooks)/sizeof(*hooks), 0);
+    int err = substitute_interpose_imports(im, hooks, sizeof(hooks)/sizeof(*hooks),
+                                           NULL, 0);
     if (err) {
         ib_log("posixspawn-hook: substitute_interpose_imports failed: %s",
                substitute_strerror(err));