Initial import of the CDE 2.1.30 sources from the Open Group.

cde/programs/dtlogin/daemon.c

@@ -0,0 +1,89 @@
+/*                                                                      *
+ * (c) Copyright 1993, 1994 Hewlett-Packard Company                     *
+ * (c) Copyright 1993, 1994 International Business Machines Corp.       *
+ * (c) Copyright 1993, 1994 Sun Microsystems, Inc.                      *
+ * (c) Copyright 1993, 1994 Novell, Inc.                                *
+ */
+/*
+ * xdm - display manager daemon
+ *
+ * $TOG: daemon.c /main/5 1998/04/06 13:21:16 mgreess $
+ *
+ * Copyright 1988 Massachusetts Institute of Technology
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose and without fee is hereby granted, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of M.I.T. not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  M.I.T. makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as is"
+ * without express or implied warranty.
+ *
+ * Author:  Keith Packard, MIT X Consortium
+ */
+
+#include <X11/Xos.h>
+#include <sys/ioctl.h>
+#ifdef hpux
+#include <sys/ptyio.h>
+#endif
+
+#ifdef SVR4
+#include <termio.h>
+#endif
+
+extern void exit ();
+
+
+void
+BecomeDaemon( void )
+{
+    register int i;
+
+    /*
+     * fork so that the process goes into the background automatically. Also
+     * has a nice side effect of having the child process get inherited by
+     * init (pid 1).
+     */
+
+    if (fork ())			/* if parent */
+      exit (0);				/* then no more work to do */
+
+    /*
+     * Close standard file descriptors and get rid of controlling tty
+     */
+
+#ifdef __osf__
+/* use setsid() instead of setpgrp() */
+    setsid();
+#else
+#if defined(SYSV) || defined (SVR4) || defined(linux)
+    setpgrp ();
+#else
+    setpgrp (0, getpid());
+#endif
+#endif /* __osf__ */
+
+    close (0); 
+    close (1);
+    close (2);
+
+    if ((i = open ("/dev/tty", O_RDWR)) >= 0) {	/* did open succeed? */
+#if defined(SYSV) && defined(TIOCTTY)
+	int zero = 0;
+	(void) ioctl (i, TIOCTTY, &zero);
+#else
+	(void) ioctl (i, TIOCNOTTY, (char *) 0);    /* detach, BSD style */
+#endif
+	(void) close (i);
+    }
+
+    /*
+     * Set up the standard file descriptors.
+     */
+    (void) open ("/", O_RDONLY);	/* root inode already in core */
+    (void) dup2 (0, 1);
+    (void) dup2 (0, 2);
+}