Intercept calls to `openat' under Android

* exec/configure.ac (OPEN_SYSCALL, OPENAT_SYSCALL): Define new
macros.

* exec/exec.h (struct exec_tracee): New field `sp'.

* exec/trace.c (handle_openat): New function.
(process_system_call): If handle_openat executes successfully,
save the unmodified stack pointer within the tracee structure to
be restored once the system call completes.

1 files changed, 4 insertions, 0 deletions

diff --git a/exec/exec.h b/exec/exec.h
index bed5edc9bab..ad1b50276c8 100644
--- a/exec/exec.h
+++ b/exec/exec.h
@@ -148,6 +148,10 @@ struct exec_tracee
   /* The next process being traced.  */
   struct exec_tracee *next;
 
+  /* Address of any stack pointer to restore after system call
+     completion.  */
+  USER_WORD sp;
+
   /* The thread ID of this process.  */
   pid_t pid;