--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xwrited-utmp-utmpx.c	Sun Apr 27 23:07:51 2014 +0200
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2010 Guido Berhoerster <guido+xwrited@berhoerster.name>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#define	_XOPEN_SOURCE	600
+
+#include <glib.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <pwd.h>
+#include <utmpx.h>
+#include <errno.h>
+#include <sys/time.h>
+
+#define	DEV_PREFIX	"/dev/"
+
+static void
+utmp_write_entry(int fd, gboolean add)
+{
+	struct utmpx	utmpx;
+	char		*line = NULL;
+	size_t		line_len;
+	char		*id;
+	struct passwd	*pwd;
+
+	line = ptsname(fd);
+	if (line == NULL) {
+		g_critical("failed to obtain slave pty name");
+		return;
+	}
+	if (g_str_has_prefix(line, DEV_PREFIX)) {
+		line += strlen(DEV_PREFIX);
+	}
+
+	line_len = strlen(line);
+	id = (line_len >= sizeof (utmpx.ut_pid)) ?
+	    line + (line_len - sizeof (utmpx.ut_pid)) :
+	    line;
+
+	pwd = getpwuid(getuid());
+	if (pwd == NULL) {
+		g_critical("failed to get username: %s", g_strerror(errno));
+		return;
+	}
+
+	memset(&utmpx, 0, sizeof (utmpx));
+	strncpy(utmpx.ut_name, pwd->pw_name, sizeof (utmpx.ut_name));
+	strncpy(utmpx.ut_id, id, sizeof (utmpx.ut_id));
+	strncpy(utmpx.ut_line, line, sizeof (utmpx.ut_line));
+	utmpx.ut_pid = getpid();
+	utmpx.ut_type = add ? USER_PROCESS : DEAD_PROCESS;
+	gettimeofday(&utmpx.ut_tv, NULL);
+
+	setutxent();
+	if (pututxline(&utmpx) == NULL) {
+		g_critical("failed to write to utmpx database: %s",
+		    g_strerror(errno));
+		return;
+	}
+	endutxent();
+}
+
+void
+xwrited_utmp_add_entry(int fd)
+{
+	utmp_write_entry(fd, TRUE);
+}
+
+void
+xwrited_utmp_remove_entry(int fd)
+{
+	utmp_write_entry(fd, FALSE);
+}