Prefer using the C++ version of the standard headers. These place the

names within the std namespace (and possibly within the global
namespace).

The main advantage is that the C++ versions can provide optimized
versions or simplified interfaces.

sbin/devd/devd.cc

@@ -73,19 +73,20 @@ __FBSDID("$FreeBSD$");
 #include <sys/wait.h>
 #include <sys/un.h>
 
-#include <ctype.h>
+#include <cctype>
+#include <cerrno>
+#include <cstdlib>
+#include <cstdio>
+#include <csignal>
+#include <cstring>
+
 #include <dirent.h>
-#include <errno.h>
 #include <err.h>
 #include <fcntl.h>
 #include <libutil.h>
 #include <paths.h>
 #include <poll.h>
 #include <regex.h>
-#include <signal.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
 #include <unistd.h>
 
 #include <algorithm>