Set owner of /var/run/utmp to root:utmp

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>

Changelog

@@ -1,6 +1,7 @@
 0.5 ()
 	- finit-alt listens to /dev/initctl to work with reboot(8)
 	- write runlevel to utmp, needed by Printerdrake (by Pascal Terjan)
+	- fix ownership of /var/run/utmp (reported by Pascal Terjan)
 
 O.4 (20080516)
 	- default username for finit-alt configurable in Makefile

finit-alt.c

@@ -325,6 +325,8 @@ int main()
 	}
 
 	touch("/var/run/utmp");
+	chown("/var/run/utmp", 0, getgroup("utmp"));
+
 #ifdef RUNLEVEL
 	memset(&entry, 0, sizeof(struct utmp));
 	entry.ut_type = RUN_LVL;

helpers.c

@@ -17,6 +17,8 @@
 #include <sys/wait.h>
 #endif
 
+#include <grp.h>
+
 #include "helpers.h"
 
 /*
@@ -157,6 +159,16 @@ int run_parts(char *dir, ...)
 	return 0;
 }
 
+int getgroup(char *s)
+{
+	struct group *grp;
+
+	if ((grp = getgrnam(s)) == NULL)
+		return -1;
+
+	return grp->gr_gid;
+}
+
 /*
  * Other convenience functions
  */

helpers.h

@@ -5,6 +5,7 @@ int	makepath	(char *);
 void	ifconfig	(char *, char *, char *, int);
 void	copyfile	(char *, char *, int);
 void	chomp		(char *);
+int	getgroup	(char *);
 
 #ifdef BUILTIN_RUNPARTS
 int	run_parts	(char *, ...);