Fork of Original Code Base: anongit.freedesktop.org/systemd

This is the initial fork of the code base from freedsktop.org.
The code is provided here as a reference of the initial starting
point and for possible future checkouts after a large portion
of this code is removed.

Merge git://anongit.freedesktop.org/systemd/systemd

1 files changed, 314 insertions, 0 deletions

diff --git a/src/libudev/libudev.c b/src/libudev/libudev.c
new file mode 100644
index 0000000000..d860ebc080
--- /dev/null
+++ b/src/libudev/libudev.c
@@ -0,0 +1,314 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
+
+  systemd 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.
+
+  systemd 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#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 <time.h>
+
+#include "libudev.h"
+#include "libudev-private.h"
+#include "missing.h"
+
+/**
+ * SECTION:libudev
+ * @short_description: libudev context
+ *
+ * The context contains the default values read from the udev config file,
+ * and is passed to all library operations.
+ */
+
+/**
+ * udev:
+ *
+ * Opaque object representing the library context.
+ */
+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;
+        struct udev_list properties_list;
+        int log_priority;
+};
+
+void udev_log(struct udev *udev,
+              int priority, const char *file, int line, const char *fn,
+              const char *format, ...)
+{
+        va_list args;
+
+        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);
+}
+
+/**
+ * udev_get_userdata:
+ * @udev: udev library context
+ *
+ * Retrieve stored data pointer from library context. This might be useful
+ * to access from callbacks like a custom logging function.
+ *
+ * Returns: stored userdata
+ **/
+_public_ void *udev_get_userdata(struct udev *udev)
+{
+        if (udev == NULL)
+                return 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 == NULL)
+                return;
+        udev->userdata = userdata;
+}
+
+/**
+ * udev_new:
+ *
+ * Create udev library context. This reads the udev configuration
+ * file, and fills in the default values.
+ *
+ * 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;
+        const char *env;
+        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, &udev->properties_list, true);
+
+        f = fopen("/etc/udev/udev.conf", "re");
+        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) {
+                                udev_err(udev, "missing <key>=<value> in /etc/udev/udev.conf[%i]; skip line\n", 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]) {
+                                        udev_err(udev, "inconsistent quoting in /etc/udev/udev.conf[%i]; skip line\n", line_nr);
+                                        continue;
+                                }
+                                val[len-1] = '\0';
+                                val++;
+                        }
+
+                        if (strcmp(key, "udev_log") == 0) {
+                                udev_set_log_priority(udev, util_log_priority(val));
+                                continue;
+                        }
+                }
+                fclose(f);
+        }
+
+        /* environment overrides config */
+        env = secure_getenv("UDEV_LOG");
+        if (env != NULL)
+                udev_set_log_priority(udev, util_log_priority(env));
+
+        return udev;
+}
+
+/**
+ * udev_ref:
+ * @udev: udev library context
+ *
+ * Take a reference of the udev library context.
+ *
+ * Returns: the passed udev library context
+ **/
+_public_ 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.
+ *
+ * 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 == NULL)
+                return NULL;
+        udev->refcount--;
+        if (udev->refcount > 0)
+                return udev;
+        udev_list_cleanup(&udev->properties_list);
+        free(udev);
+        return NULL;
+}
+
+/**
+ * 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.
+ *
+ **/
+_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))
+{
+        udev->log_fn = log_fn;
+        udev_dbg(udev, "custom logging function %p registered\n", log_fn);
+}
+
+/**
+ * udev_get_log_priority:
+ * @udev: udev library context
+ *
+ * The initial logging priority is read from the udev config file
+ * at startup.
+ *
+ * Returns: the current logging priority
+ **/
+_public_ int udev_get_log_priority(struct udev *udev)
+{
+        return udev->log_priority;
+}
+
+/**
+ * udev_set_log_priority:
+ * @udev: udev library context
+ * @priority: the new logging priority
+ *
+ * Set the current logging priority. The value controls which messages
+ * are logged.
+ **/
+_public_ 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);
+}
+
+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->properties_list, key, value);
+}
+
+struct udev_list_entry *udev_get_properties_list_entry(struct udev *udev)
+{
+        return udev_list_get_entry(&udev->properties_list);
+}