Index: uspace/lib/c/Makefile
===================================================================
--- uspace/lib/c/Makefile	(revision 857edacfd2083028539297de5770b5f4a4a4dd36)
+++ uspace/lib/c/Makefile	(revision 322a8066dd6a2df80d2650aaf0b4e19bbe60b576)
@@ -77,4 +77,5 @@
 	generic/io/io.c \
 	generic/io/printf.c \
+	generic/io/log.c \
 	generic/io/klog.c \
 	generic/io/snprintf.c \
Index: uspace/lib/c/generic/devman.c
===================================================================
--- uspace/lib/c/generic/devman.c	(revision 857edacfd2083028539297de5770b5f4a4a4dd36)
+++ uspace/lib/c/generic/devman.c	(revision 322a8066dd6a2df80d2650aaf0b4e19bbe60b576)
@@ -147,6 +147,4 @@
 		ret = devman_send_match_id(phone, match_id);
 		if (ret != EOK) {
-			printf("Driver failed to send match id, error %d\n",
-			    ret);
 			return ret;
 		}
@@ -195,10 +193,15 @@
 	}
 	
-	devman_send_match_ids(phone, match_ids);
-	
-	async_wait_for(req, &retval);
-	
-	async_serialize_end();
-	
+	int match_ids_rc = devman_send_match_ids(phone, match_ids);
+	
+	async_wait_for(req, &retval);
+	
+	async_serialize_end();
+	
+	/* Prefer the answer to DEVMAN_ADD_FUNCTION in case of errors. */
+	if ((match_ids_rc != EOK) && (retval == EOK)) {
+		retval = match_ids_rc;
+	}
+
 	if (retval == EOK)
 		fun_handle = (int) IPC_GET_ARG1(answer);
@@ -326,4 +329,49 @@
 }
 
+int devman_device_get_handle_by_class(const char *classname,
+    const char *devname, devman_handle_t *handle, unsigned int flags)
+{
+	int phone = devman_get_phone(DEVMAN_CLIENT, flags);
+
+	if (phone < 0)
+		return phone;
+
+	async_serialize_start();
+
+	ipc_call_t answer;
+	aid_t req = async_send_1(phone, DEVMAN_DEVICE_GET_HANDLE_BY_CLASS,
+	    flags, &answer);
+
+	sysarg_t retval = async_data_write_start(phone, classname,
+	    str_size(classname));
+	if (retval != EOK) {
+		async_wait_for(req, NULL);
+		async_serialize_end();
+		return retval;
+	}
+	retval = async_data_write_start(phone, devname,
+	    str_size(devname));
+	if (retval != EOK) {
+		async_wait_for(req, NULL);
+		async_serialize_end();
+		return retval;
+	}
+
+	async_wait_for(req, &retval);
+
+	async_serialize_end();
+
+	if (retval != EOK) {
+		if (handle != NULL)
+			*handle = (devman_handle_t) -1;
+		return retval;
+	}
+
+	if (handle != NULL)
+		*handle = (devman_handle_t) IPC_GET_ARG1(answer);
+
+	return retval;
+}
+
 
 /** @}
Index: uspace/lib/c/generic/io/log.c
===================================================================
--- uspace/lib/c/generic/io/log.c	(revision 322a8066dd6a2df80d2650aaf0b4e19bbe60b576)
+++ uspace/lib/c/generic/io/log.c	(revision 322a8066dd6a2df80d2650aaf0b4e19bbe60b576)
@@ -0,0 +1,123 @@
+/*
+ * Copyright (c) 2011 Vojtech Horky
+ * Copyright (c) 2011 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libc
+ * @{
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <fibril_synch.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <io/log.h>
+
+/** Serialization mutex for logging functions. */
+static FIBRIL_MUTEX_INITIALIZE(log_serializer);
+
+/** Current log level. */
+static log_level_t log_level;
+
+static FILE *log_stream;
+
+static const char *log_prog_name;
+
+/** Prefixes for individual logging levels. */
+static const char *log_level_names[] = {
+	[LVL_FATAL] = "Fatal error",
+	[LVL_ERROR] = "Error",
+	[LVL_WARN] = "Warning",
+	[LVL_NOTE] = "Note",
+	[LVL_DEBUG] = "Debug",
+	[LVL_DEBUG2] = "Debug2"
+};
+
+/** Initialize the logging system.
+ *
+ * @param prog_name	Program name, will be printed as part of message
+ * @param level		Minimum message level to print
+ */
+int log_init(const char *prog_name, log_level_t level)
+{
+	assert(level < LVL_LIMIT);
+	log_level = level;
+
+	log_stream = stdout;
+	log_prog_name = str_dup(prog_name);
+	if (log_prog_name == NULL)
+		return ENOMEM;
+
+	return EOK;
+}
+
+/** Write an entry to the log.
+ *
+ * @param level		Message verbosity level. Message is only printed
+ *			if verbosity is less than or equal to current
+ *			reporting level.
+ * @param fmt		Format string (no traling newline).
+ */
+void log_msg(log_level_t level, const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	log_msgv(level, fmt, args);
+	va_end(args);
+}
+
+/** Write an entry to the log (va_list variant).
+ *
+ * @param level		Message verbosity level. Message is only printed
+ *			if verbosity is less than or equal to current
+ *			reporting level.
+ * @param fmt		Format string (no trailing newline)
+ */
+void log_msgv(log_level_t level, const char *fmt, va_list args)
+{
+	assert(level < LVL_LIMIT);
+
+	/* Higher number means higher verbosity. */
+	if (level <= log_level) {
+		fibril_mutex_lock(&log_serializer);
+
+		fprintf(log_stream, "%s: %s: ", log_prog_name,
+		    log_level_names[level]);
+		vfprintf(log_stream, fmt, args);
+		fputc('\n', log_stream);
+		fflush(log_stream);
+
+		fibril_mutex_unlock(&log_serializer);
+	}
+}
+
+/** @}
+ */
Index: uspace/lib/c/include/devman.h
===================================================================
--- uspace/lib/c/include/devman.h	(revision 857edacfd2083028539297de5770b5f4a4a4dd36)
+++ uspace/lib/c/include/devman.h	(revision 322a8066dd6a2df80d2650aaf0b4e19bbe60b576)
@@ -53,4 +53,6 @@
 extern int devman_device_get_handle(const char *, devman_handle_t *,
     unsigned int);
+extern int devman_device_get_handle_by_class(const char *, const char *,
+    devman_handle_t *, unsigned int);
 
 extern int devman_add_device_to_class(devman_handle_t, const char *);
Index: uspace/lib/c/include/io/log.h
===================================================================
--- uspace/lib/c/include/io/log.h	(revision 322a8066dd6a2df80d2650aaf0b4e19bbe60b576)
+++ uspace/lib/c/include/io/log.h	(revision 322a8066dd6a2df80d2650aaf0b4e19bbe60b576)
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2011 Vojtech Horky
+ * Copyright (c) 2011 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libc
+ * @{
+ */
+
+#ifndef LIBC_IO_LOG_H_
+#define LIBC_IO_LOG_H_
+
+#include <stdarg.h>
+
+typedef enum {
+	LVL_FATAL,
+	LVL_ERROR,
+	LVL_WARN,
+	LVL_NOTE,
+	LVL_DEBUG,
+	LVL_DEBUG2,
+
+	/** For checking range of values */
+	LVL_LIMIT
+} log_level_t;
+
+extern int log_init(const char *, log_level_t);
+extern void log_msg(log_level_t, const char *, ...);
+extern void log_msgv(log_level_t, const char *, va_list);
+
+#endif
+
+/** @}
+ */
Index: uspace/lib/c/include/ipc/devman.h
===================================================================
--- uspace/lib/c/include/ipc/devman.h	(revision 857edacfd2083028539297de5770b5f4a4a4dd36)
+++ uspace/lib/c/include/ipc/devman.h	(revision 322a8066dd6a2df80d2650aaf0b4e19bbe60b576)
@@ -148,5 +148,6 @@
 
 typedef enum {
-	DEVMAN_DEVICE_GET_HANDLE = IPC_FIRST_USER_METHOD
+	DEVMAN_DEVICE_GET_HANDLE = IPC_FIRST_USER_METHOD,
+	DEVMAN_DEVICE_GET_HANDLE_BY_CLASS
 } client_to_devman_t;
 
