libudev: move to top-level directory

1 files changed, 374 insertions, 0 deletions

diff --git a/libudev/libudev.c b/libudev/libudev.c
new file mode 100644
index 0000000000..a9baa70799
--- /dev/null
+++ b/libudev/libudev.c
@@ -0,0 +1,374 @@
+/*
+ * libudev - interface to udev device information
+ *
+ * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "libudev.h"
+#include "libudev-private.h"
+
+struct udev {
+	int refcount;
+	void (*log_fn)(struct udev *udev,
+		       int priority, const char *file, int line, const char *fn,
+		       const char *format, va_list args);
+	void *userdata;
+	char *sys_path;
+	char *dev_path;
+	char *rules_path;
+	struct udev_list_node properties_list;
+	int log_priority;
+	int run;
+};
+
+void udev_log(struct udev *udev,
+	      int priority, const char *file, int line, const char *fn,
+	      const char *format, ...)
+{
+	va_list args;
+
+	if (priority > udev->log_priority)
+		return;
+
+	va_start(args, format);
+	udev->log_fn(udev, priority, file, line, fn, format, args);
+	va_end(args);
+}
+
+static void log_stderr(struct udev *udev,
+		       int priority, const char *file, int line, const char *fn,
+		       const char *format, va_list args)
+{
+	fprintf(stderr, "libudev: %s: ", fn);
+	vfprintf(stderr, format, args);
+}
+
+void *udev_get_userdata(struct udev *udev)
+{
+	if (udev == NULL)
+		return NULL;
+	return udev->userdata;
+}
+
+void udev_set_userdata(struct udev *udev, void *userdata)
+{
+	if (udev == NULL)
+		return;
+	udev->userdata = userdata;
+}
+
+/**
+ * udev_new:
+ *
+ * Create udev library context.
+ *
+ * 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
+ **/
+struct udev *udev_new(void)
+{
+	struct udev *udev;
+	const char *env;
+	char *config_file;
+	FILE *f;
+
+	udev = calloc(1, sizeof(struct udev));
+	if (udev == NULL)
+		return NULL;
+	udev->refcount = 1;
+	udev->log_fn = log_stderr;
+	udev->log_priority = LOG_ERR;
+	udev_list_init(&udev->properties_list);
+	udev->run = 1;
+	udev->dev_path = strdup(UDEV_PREFIX "/dev");
+	udev->sys_path = strdup("/sys");
+	config_file = strdup(SYSCONFDIR "/udev/udev.conf");
+	if (udev->dev_path == NULL ||
+	    udev->sys_path == NULL ||
+	    config_file == NULL)
+		goto err;
+
+	/* settings by environment and config file */
+	env = getenv("SYSFS_PATH");
+	if (env != NULL) {
+		free(udev->sys_path);
+		udev->sys_path = strdup(env);
+		util_remove_trailing_chars(udev->sys_path, '/');
+		udev_add_property(udev, "SYSFS_PATH", udev->sys_path);
+	}
+
+	env = getenv("UDEV_RUN");
+	if (env != NULL && strcmp(env, "0") == 0)
+		udev->run = 0;
+
+	env = getenv("UDEV_CONFIG_FILE");
+	if (env != NULL) {
+		free(config_file);
+		config_file = strdup(env);
+		util_remove_trailing_chars(config_file, '/');
+	}
+	if (config_file == NULL)
+		goto err;
+	f = fopen(config_file, "r");
+	if (f != NULL) {
+		char line[UTIL_LINE_SIZE];
+		int line_nr = 0;
+
+		while (fgets(line, sizeof(line), f)) {
+			size_t len;
+			char *key;
+			char *val;
+
+			line_nr++;
+
+			/* find key */
+			key = line;
+			while (isspace(key[0]))
+				key++;
+
+			/* comment or empty line */
+			if (key[0] == '#' || key[0] == '\0')
+				continue;
+
+			/* split key/value */
+			val = strchr(key, '=');
+			if (val == NULL) {
+				err(udev, "missing <key>=<value> in '%s'[%i], skip line\n", config_file, line_nr);
+				continue;
+			}
+			val[0] = '\0';
+			val++;
+
+			/* find value */
+			while (isspace(val[0]))
+				val++;
+
+			/* terminate key */
+			len = strlen(key);
+			if (len == 0)
+				continue;
+			while (isspace(key[len-1]))
+				len--;
+			key[len] = '\0';
+
+			/* terminate value */
+			len = strlen(val);
+			if (len == 0)
+				continue;
+			while (isspace(val[len-1]))
+				len--;
+			val[len] = '\0';
+
+			if (len == 0)
+				continue;
+
+			/* unquote */
+			if (val[0] == '"' || val[0] == '\'') {
+				if (val[len-1] != val[0]) {
+					err(udev, "inconsistent quoting in '%s'[%i], skip line\n", config_file, line_nr);
+					continue;
+				}
+				val[len-1] = '\0';
+				val++;
+			}
+
+			if (strcmp(key, "udev_log") == 0) {
+				udev_set_log_priority(udev, util_log_priority(val));
+				continue;
+			}
+			if (strcmp(key, "udev_root") == 0) {
+				free(udev->dev_path);
+				udev->dev_path = strdup(val);
+				util_remove_trailing_chars(udev->dev_path, '/');
+				continue;
+			}
+			if (strcmp(key, "udev_rules") == 0) {
+				free(udev->rules_path);
+				udev->rules_path = strdup(val);
+				util_remove_trailing_chars(udev->rules_path, '/');
+				continue;
+			}
+		}
+		fclose(f);
+	}
+
+	env = getenv("UDEV_ROOT");
+	if (env != NULL) {
+		free(udev->dev_path);
+		udev->dev_path = strdup(env);
+		util_remove_trailing_chars(udev->dev_path, '/');
+		udev_add_property(udev, "UDEV_ROOT", udev->dev_path);
+	}
+
+	env = getenv("UDEV_LOG");
+	if (env != NULL)
+		udev_set_log_priority(udev, util_log_priority(env));
+
+	if (udev->dev_path == NULL || udev->sys_path == NULL)
+		goto err;
+	dbg(udev, "context %p created\n", udev);
+	dbg(udev, "log_priority=%d\n", udev->log_priority);
+	dbg(udev, "config_file='%s'\n", config_file);
+	dbg(udev, "dev_path='%s'\n", udev->dev_path);
+	dbg(udev, "sys_path='%s'\n", udev->sys_path);
+	if (udev->rules_path != NULL)
+		dbg(udev, "rules_path='%s'\n", udev->rules_path);
+	free(config_file);
+	return udev;
+err:
+	free(config_file);
+	err(udev, "context creation failed\n");
+	udev_unref(udev);
+	return NULL;
+}
+
+/**
+ * udev_ref:
+ * @udev: udev library context
+ *
+ * Take a reference of the udev library context.
+ *
+ * Returns: the passed udev library context
+ **/
+struct udev *udev_ref(struct udev *udev)
+{
+	if (udev == NULL)
+		return NULL;
+	udev->refcount++;
+	return 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.
+ *
+ **/
+void udev_unref(struct udev *udev)
+{
+	if (udev == NULL)
+		return;
+	udev->refcount--;
+	if (udev->refcount > 0)
+		return;
+	udev_list_cleanup_entries(udev, &udev->properties_list);
+	free(udev->dev_path);
+	free(udev->sys_path);
+	free(udev->rules_path);
+	dbg(udev, "context %p released\n", udev);
+	free(udev);
+}
+
+/**
+ * udev_set_log_fn:
+ * @udev: udev library context
+ * @log_fn: function to be called for logging messages
+ *
+ * The built-in logging writes to stderr. It can be
+ * overridden by a custom function, to plug log messages
+ * into the users' logging functionality.
+ *
+ **/
+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))
+{
+	udev->log_fn = log_fn;
+	info(udev, "custom logging function %p registered\n", udev);
+}
+
+int udev_get_log_priority(struct udev *udev)
+{
+	return udev->log_priority;
+}
+
+void udev_set_log_priority(struct udev *udev, int priority)
+{
+	char num[32];
+
+	udev->log_priority = priority;
+	snprintf(num, sizeof(num), "%u", udev->log_priority);
+	udev_add_property(udev, "UDEV_LOG", num);
+}
+
+const char *udev_get_rules_path(struct udev *udev)
+{
+	return udev->rules_path;
+}
+
+int udev_get_run(struct udev *udev)
+{
+	return udev->run;
+}
+
+/**
+ * udev_get_sys_path:
+ * @udev: udev library context
+ *
+ * Retrieve the sysfs mount point. The default is "/sys". For
+ * testing purposes, it can be overridden with the environment
+ * variable SYSFS_PATH.
+ *
+ * Returns: the sys mount point
+ **/
+const char *udev_get_sys_path(struct udev *udev)
+{
+	if (udev == NULL)
+		return NULL;
+	return udev->sys_path;
+}
+
+/**
+ * udev_get_dev_path:
+ * @udev: udev library context
+ *
+ * Retrieve the device directory path. The default value is "/dev",
+ * the actual value may be overridden in the udev configuration
+ * file.
+ *
+ * Returns: the device directory path
+ **/
+const char *udev_get_dev_path(struct udev *udev)
+{
+	if (udev == NULL)
+		return NULL;
+	return udev->dev_path;
+}
+
+struct udev_list_entry *udev_add_property(struct udev *udev, const char *key, const char *value)
+{
+	if (value == NULL) {
+		struct udev_list_entry *list_entry;
+
+		list_entry = udev_get_properties_list_entry(udev);
+		list_entry = udev_list_entry_get_by_name(list_entry, key);
+		if (list_entry != NULL)
+			udev_list_entry_delete(list_entry);
+		return NULL;
+	}
+	return udev_list_entry_add(udev, &udev->properties_list, key, value, 1, 0);
+}
+
+struct udev_list_entry *udev_get_properties_list_entry(struct udev *udev)
+{
+	return udev_list_get_entry(&udev->properties_list);
+}