proto-shell: make handler dump code more generic

[project/netifd.git] / proto-shell.c

diff --git a/proto-shell.c b/proto-shell.c
index 3e13d0f..9c242e7 100644 (file)
--- a/proto-shell.c
+++ b/proto-shell.c
@@ -858,7 +858,48 @@ proto_shell_add_handler(const char *script, json_object *obj)
        add_proto_handler(proto);
 }
 
-static void proto_shell_add_script(const char *name)
+typedef void (*script_dump_cb)(const char *name, json_object *obj);
+
+static int
+netifd_dir_push(int fd)
+{
+       int prev_fd = open(".", O_RDONLY | O_DIRECTORY);
+       system_fd_set_cloexec(prev_fd);
+       if (fd >= 0)
+               fchdir(fd);
+       return prev_fd;
+}
+
+static void
+netifd_dir_pop(int prev_fd)
+{
+       fchdir(prev_fd);
+       close(prev_fd);
+}
+
+static int
+netifd_open_subdir(const char *name)
+{
+       int prev_dir;
+       int ret = -1;
+
+       prev_dir = netifd_dir_push(-1);
+       if (chdir(main_path)) {
+               perror("chdir(main path)");
+               goto out;
+       }
+
+       ret = open(name, O_RDONLY | O_DIRECTORY);
+       if (ret >= 0)
+               system_fd_set_cloexec(ret);
+
+out:
+       netifd_dir_pop(prev_dir);
+       return ret;
+}
+
+static void
+netifd_init_script_handler(const char *name, script_dump_cb cb)
 {
        struct json_tokener *tok = NULL;
        json_object *obj;
@@ -888,7 +929,7 @@ static void proto_shell_add_script(const char *name)
 
                obj = json_tokener_parse_ex(tok, start, len);
                if (!is_error(obj)) {
-                       proto_shell_add_handler(name, obj);
+                       cb(name, obj);
                        json_object_put(obj);
                        json_tokener_free(tok);
                        tok = NULL;
@@ -904,34 +945,24 @@ static void proto_shell_add_script(const char *name)
        pclose(f);
 }
 
-static void __init proto_shell_init(void)
+static void
+netifd_init_script_handlers(int dir_fd, script_dump_cb cb)
 {
        glob_t g;
-       int main_fd;
-       int i;
-
-       main_fd = open(".", O_RDONLY | O_DIRECTORY);
-       if (main_fd < 0)
-               return;
-
-       if (chdir(main_path)) {
-               perror("chdir(main path)");
-               goto close_cur;
-       }
-
-       if (chdir("./proto"))
-               goto close_cur;
+       int i, prev_fd;
 
-       proto_fd = open(".", O_RDONLY | O_DIRECTORY);
-       if (proto_fd < 0)
-               goto close_cur;
-
-       system_fd_set_cloexec(proto_fd);
+       prev_fd = netifd_dir_push(dir_fd);
        glob("./*.sh", 0, NULL, &g);
        for (i = 0; i < g.gl_pathc; i++)
-               proto_shell_add_script(g.gl_pathv[i]);
+               netifd_init_script_handler(g.gl_pathv[i], cb);
+       netifd_dir_pop(prev_fd);
+}
+
+static void __init proto_shell_init(void)
+{
+       proto_fd = netifd_open_subdir("proto");
+       if (proto_fd < 0)
+               return;
 
-close_cur:
-       fchdir(main_fd);
-       close(main_fd);
+       netifd_init_script_handlers(proto_fd, proto_shell_add_handler);
 }