Add GNU/kFreeBSD support (#645)

* GNU/kFreeBSD is a FreeBSD variant, for code purposes.

* GNU/kFreeBSD uses GNU/Linux-ish init scripts, however.

common/os_calls.c

@@ -87,8 +87,8 @@ extern char **environ;
 #endif
 
 /* sys/ucred.h needs to be included to use struct xucred
- * in FreeBSD and OS X. No need for other BSDs  */
-#if defined(__FreeBSD__) || defined(__APPLE__)
+ * in FreeBSD and OS X. No need for other BSDs except GNU/kFreeBSD */
+#if defined(__FreeBSD__) || defined(__APPLE__) || defined(__FreeBSD_kernel__)
 #include <sys/ucred.h>
 #endif
 

configure.ac

@@ -28,6 +28,9 @@ case $host_os in
 	*linux*)
 		linux=yes
 		;;
+	*kfreebsd*)
+		linux=yes # only used in instfiles/ so that’s ok for us for now
+		;;
 	*freebsd*)
 		freebsd=yes
 		;;

sesman/session.c

@@ -503,7 +503,7 @@ session_start_fork(tbus data, tui8 type, struct SCP_SESSION *s)
         g_sprintf(geometry, "%dx%d", s->width, s->height);
         g_sprintf(depth, "%d", s->bpp);
         g_sprintf(screen, ":%d", display);
-#ifdef __FreeBSD__
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
         /*
          * FreeBSD bug
          * ports/157282: effective login name is not set by xrdp-sesman