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authorAleksander Morgado <aleksander@aleksander.es>2021-02-12 11:00:08 +0100
committerAleksander Morgado <aleksander@aleksander.es>2021-03-10 10:59:22 +0100
commit73830f0bd094c35ff5f364e5265d4b61bf0a5110 (patch)
treef2129517d8a417a396311ae3f0d8249a30e4585e /src/kerneldevice/mm-kernel-device-helpers.c
parent6a791dd8b79f92058adf4fc2ade60385b43d8339 (diff)
kernel-device: new helper to load lower device link names
Based exclusively on sysfs for now. We could do this via netlink if needed as well.
Diffstat (limited to 'src/kerneldevice/mm-kernel-device-helpers.c')
-rw-r--r--src/kerneldevice/mm-kernel-device-helpers.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/src/kerneldevice/mm-kernel-device-helpers.c b/src/kerneldevice/mm-kernel-device-helpers.c
new file mode 100644
index 00000000..d9bcfd97
--- /dev/null
+++ b/src/kerneldevice/mm-kernel-device-helpers.c
@@ -0,0 +1,62 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details:
+ *
+ * Copyright (C) 2021 Aleksander Morgado <aleksander@aleksander.es>
+ */
+
+#include <stdlib.h>
+
+#include <glib.h>
+#include <glib-object.h>
+#include <gio/gio.h>
+
+#include "mm-kernel-device-helpers.h"
+
+gchar *
+mm_kernel_device_get_lower_device_name (const gchar *sysfs_path)
+{
+ g_autoptr(GFile) dirfile = NULL;
+ g_autoptr(GFileEnumerator) direnum = NULL;
+
+ dirfile = g_file_new_for_path (sysfs_path);
+ direnum = g_file_enumerate_children (dirfile,
+ G_FILE_ATTRIBUTE_STANDARD_NAME,
+ G_FILE_QUERY_INFO_NONE,
+ NULL,
+ NULL);
+ if (!direnum)
+ return NULL;
+
+ while (TRUE) {
+ GFileInfo *info;
+ g_autofree gchar *filename = NULL;
+ g_autofree gchar *link_path = NULL;
+ g_autofree gchar *real_path = NULL;
+ g_autofree gchar *basename = NULL;
+
+ if (!g_file_enumerator_iterate (direnum, &info, NULL, NULL, NULL) || !info)
+ break;
+
+ filename = g_file_info_get_attribute_as_string (info, G_FILE_ATTRIBUTE_STANDARD_NAME);
+ if (!filename || !g_str_has_prefix (filename, "lower_"))
+ continue;
+
+ link_path = g_strdup_printf ("%s/%s", sysfs_path, filename);
+ real_path = realpath (link_path, NULL);
+ if (!real_path)
+ continue;
+
+ return g_path_get_basename (real_path);
+ }
+
+ return NULL;
+}