diff -up xinit-1.3.4/xinit.c.client-session xinit-1.3.4/xinit.c
--- xinit-1.3.4/xinit.c.client-session	2014-03-25 10:20:26.000000000 +0100
+++ xinit-1.3.4/xinit.c	2014-09-11 17:03:30.928360694 +0200
@@ -89,6 +89,8 @@ char xserverrcbuf[256];
 
 #define TRUE 1
 #define FALSE 0
+#define OK_EXIT 0
+#define ERR_EXIT 1
 
 static char *default_server = "X";
 static char *default_display = ":0";        /* choose most efficient */
@@ -560,6 +562,7 @@ startClient(char *client_argv[])
 {
     clientpid = fork();
     if (clientpid == 0) {
+        int fd;
         set_environment();
         setWindowPath();
 
@@ -567,7 +570,16 @@ startClient(char *client_argv[])
             Error("cannot change uid");
             _exit(EXIT_FAILURE);
         }
-        setpgid(0, getpid());
+        fd = open ("/dev/null", O_RDONLY);
+
+        if (fd < 0) {
+            Error("cannot open /dev/null: %s\n", strerror(errno));
+            _exit(ERR_EXIT);
+        }
+        close (STDIN_FILENO);
+        dup2 (fd, STDIN_FILENO);
+        close (fd);
+        setsid();
         Execute(client_argv);
         Error("Unable to run program \"%s\"", client_argv[0]);