Properly set up SIGCHLD handlers

Instead of having all-purpose SIGCHLD handlers that try to catch
every occurrence, we instead create a per-PID handler. This will
allow us to specify callbacks to occur when certain children exit.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/providers/child_common.h b/src/providers/child_common.h
index 0b2081d2d..22a77dbbe 100644
--- a/src/providers/child_common.h
+++ b/src/providers/child_common.h
@@ -45,6 +45,18 @@ struct io_buffer {
     size_t size;
 };
 
+/* Callback to be invoked when a sigchld handler is called.
+ * The tevent_signal * associated with the handler will be
+ * freed automatically when this function returns.
+ */
+typedef void (*sss_child_callback_t)(int child_status,
+                                     struct tevent_signal *sige,
+                                     void *pvt);
+
+/* Set up child termination signal handler */
+int child_handler_setup(struct tevent_context *ev, int pid,
+                        sss_child_callback_t cb, void *pvt);
+
 /* Async communication with the child process via a pipe */
 struct tevent_req *write_pipe_send(TALLOC_CTX *mem_ctx,
                                    struct tevent_context *ev,