1 files changed, 154 insertions, 0 deletions
diff --git a/src/libudev/libudev.c b/src/libudev/libudev.c
new file mode 100644
index 0000000..7357487
--- /dev/null
+++ b/src/libudev/libudev.c
@@ -0,0 +1,154 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <ctype.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "libudev.h"
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "string-util.h"
+
+/**
+ * SECTION:libudev
+ * @short_description: libudev context
+ */
+
+/**
+ * udev:
+ *
+ * Opaque object representing the library context.
+ */
+struct udev {
+        unsigned n_ref;
+        void *userdata;
+};
+
+/**
+ * udev_get_userdata:
+ * @udev: udev library context
+ *
+ * Retrieve stored data pointer from library context. This might be useful
+ * to access from callbacks.
+ *
+ * Returns: stored userdata
+ **/
+_public_ void *udev_get_userdata(struct udev *udev) {
+        assert_return(udev, NULL);
+
+        return udev->userdata;
+}
+
+/**
+ * udev_set_userdata:
+ * @udev: udev library context
+ * @userdata: data pointer
+ *
+ * Store custom @userdata in the library context.
+ **/
+_public_ void udev_set_userdata(struct udev *udev, void *userdata) {
+        if (!udev)
+                return;
+
+        udev->userdata = userdata;
+}
+
+/**
+ * udev_new:
+ *
+ * Create udev library context. This only allocates the basic data structure.
+ *
+ * The initial refcount is 1, and needs to be decremented to
+ * release the resources of the udev library context.
+ *
+ * Returns: a new udev library context
+ **/
+_public_ struct udev *udev_new(void) {
+        struct udev *udev;
+
+        udev = new(struct udev, 1);
+        if (!udev)
+                return_with_errno(NULL, ENOMEM);
+
+        *udev = (struct udev) {
+                .n_ref = 1,
+        };
+
+        return udev;
+}
+
+/**
+ * udev_ref:
+ * @udev: udev library context
+ *
+ * Take a reference of the udev library context.
+ *
+ * Returns: the passed udev library context
+ **/
+DEFINE_PUBLIC_TRIVIAL_REF_FUNC(struct udev, udev);
+
+/**
+ * udev_unref:
+ * @udev: udev library context
+ *
+ * Drop a reference of the udev library context. If the refcount
+ * reaches zero, the resources of the context will be released.
+ *
+ * Returns: the passed udev library context if it has still an active reference, or #NULL otherwise.
+ **/
+_public_ struct udev *udev_unref(struct udev *udev) {
+        if (!udev)
+                return NULL;
+
+        assert(udev->n_ref > 0);
+        udev->n_ref--;
+        if (udev->n_ref > 0)
+                /* This is different from our convention, but let's keep backward
+                 * compatibility. So, do not use DEFINE_PUBLIC_TRIVIAL_UNREF_FUNC()
+                 * macro to define this function. */
+                return udev;
+
+        return mfree(udev);
+}
+
+/**
+ * udev_set_log_fn:
+ * @udev: udev library context
+ * @log_fn: function to be called for log messages
+ *
+ * This function is deprecated.
+ *
+ **/
+_public_ void udev_set_log_fn(
+                        struct udev *udev,
+                        void (*log_fn)(struct udev *udev,
+                                       int priority, const char *file, int line, const char *fn,
+                                       const char *format, va_list args)) {
+        return;
+}
+
+/**
+ * udev_get_log_priority:
+ * @udev: udev library context
+ *
+ * This function is deprecated.
+ *
+ **/
+_public_ int udev_get_log_priority(struct udev *udev) {
+        return log_get_max_level();
+}
+
+/**
+ * udev_set_log_priority:
+ * @udev: udev library context
+ * @priority: the new log priority
+ *
+ * This function is deprecated.
+ *
+ **/
+_public_ void udev_set_log_priority(struct udev *udev, int priority) {
+        log_set_max_level(priority);
+}