libusbgx: Add remove binding functionality.

Add function which allow to remove binding between function
and configuration. This functions also remove binding from
internal library structures wht means that after this
operation all pointers to removed binding are invalid.

Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
[Port from libusbg and update description]
Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>

diff --git a/include/usbg/usbg.h b/include/usbg/usbg.h
index e160da1..5ebc273 100644 (file)
--- a/include/usbg/usbg.h
+++ b/include/usbg/usbg.h
@@ -276,6 +276,16 @@ extern usbg_function *usbg_get_function(usbg_gadget *g,
  */
 extern usbg_config *usbg_get_config(usbg_gadget *g, int id, const char *label);
 
+/* USB gadget/config/function/binding removal */
+
+/**
+ * @brief Remove binding between configuration and function
+ * @details This function frees also the memory allocated for binding
+ * @param b Binding to be removed
+ * @return 0 on success, usbg_error if error occurred
+ */
+extern int usbg_rm_binding(usbg_binding *b);
+
 /* USB gadget allocation and configuration */
 
 /**

diff --git a/src/usbg.c b/src/usbg.c
index f7bd7aa..6eacd3f 100644 (file)
--- a/src/usbg.c
+++ b/src/usbg.c
@@ -146,6 +146,7 @@ static int usbg_translate_error(int error)
                break;
        case EACCES:
        case EROFS:
+       case EPERM:
                ret = USBG_ERROR_NO_ACCESS;
                break;
        case ENOENT:
@@ -677,6 +678,25 @@ static usbg_binding *usbg_allocate_binding(char *path, char *name,
        return b;
 }
 
+static int ubsg_rm_file(char *path, char *name)
+{
+       int ret = USBG_SUCCESS;
+       int nmb;
+       char buf[USBG_MAX_PATH_LENGTH];
+
+       nmb = snprintf(buf, sizeof(buf), "%s/%s", path, name);
+       if (nmb < sizeof(buf)) {
+               nmb = unlink(buf);
+               if (nmb != 0)
+                       ret = usbg_translate_error(errno);
+       } else {
+               ret = USBG_ERROR_PATH_TOO_LONG;
+       }
+
+       return ret;
+}
+
+
 static int usbg_parse_function_net_attrs(usbg_function *f,
                usbg_function_attrs *f_attrs)
 {
@@ -1263,6 +1283,25 @@ usbg_binding *usbg_get_link_binding(usbg_config *c, usbg_function *f)
        return NULL;
 }
 
+int usbg_rm_binding(usbg_binding *b)
+{
+       int ret = USBG_SUCCESS;
+       usbg_config *c;
+
+       if (!b)
+               return USBG_ERROR_INVALID_PARAM;
+
+       c = b->parent;
+
+       ret = ubsg_rm_file(b->path, b->name);
+       if (ret == USBG_SUCCESS) {
+               TAILQ_REMOVE(&(c->bindings), b, bnode);
+               usbg_free_binding(b);
+       }
+
+       return ret;
+}
+
 static int usbg_create_empty_gadget(usbg_state *s, char *name, usbg_gadget **g)
 {
        char gpath[USBG_MAX_PATH_LENGTH];