From df3e1beed5bbb631975127133464b7e24fc38497 Mon Sep 17 00:00:00 2001
From: Kaleb Keithley <kaleb@freedesktop.org>
Date: Fri, 14 Nov 2003 15:54:53 +0000
Subject: R6.6 is the Xorg base-line

---
 daemon.c | 146 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 daemon.c

(limited to 'daemon.c')

diff --git a/daemon.c b/daemon.c
new file mode 100644
index 0000000..937240c
--- /dev/null
+++ b/daemon.c
@@ -0,0 +1,146 @@
+/* $Xorg: daemon.c,v 1.4 2001/02/09 02:05:40 xorgcvs Exp $ */
+/*
+
+Copyright 1988, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall
+not be used in advertising or otherwise to promote the sale, use or
+other dealings in this Software without prior written authorization
+from The Open Group.
+
+*/
+
+/*
+ * xdm - display manager daemon
+ * Author:  Keith Packard, MIT X Consortium
+ */
+
+#include <X11/Xos.h>
+
+#if defined(SVR4) || defined(USG)
+#include <termios.h>
+#else
+#include <sys/ioctl.h>
+#endif
+#if defined(__osf__) || defined(linux)
+#define setpgrp setpgid
+#endif
+#ifdef hpux
+#include <sys/ptyio.h>
+#endif
+#include <errno.h>
+#ifdef X_NOT_STDC_ENV
+extern int errno;
+#endif
+#include <sys/types.h>
+#ifdef X_NOT_POSIX
+#define Pid_t int
+#else
+#define Pid_t pid_t
+#endif
+
+extern void exit ();
+
+BecomeOrphan ()
+{
+    Pid_t child_id;
+    int stat;
+
+    /*
+     * 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).
+     * Separate the child into its own process group before the parent
+     * exits.  This eliminates the possibility that the child might get
+     * killed when the init script that's running xdm exits.
+     */
+
+    child_id = fork();
+    switch (child_id) {
+    case 0:
+	/* child */
+	break;
+    case -1:
+	/* error */
+	LogError("daemon fork failed, errno = %d\n", errno);
+	break;
+
+    default:
+	/* parent */
+
+#if defined(SVR4)
+	stat = setpgid(child_id, child_id);
+	/* This gets error EPERM.  Why? */
+#else
+#if defined(SYSV)
+	stat = 0;	/* don't know how to set child's process group */
+#else
+	stat = setpgrp(child_id, child_id);
+	if (stat != 0)
+	    LogError("setting process grp for daemon failed, errno = %d\n",
+		     errno);
+#endif
+#endif
+	exit (0);
+    }
+}
+
+BecomeDaemon ()
+{
+    register int i;
+
+    /*
+     * Close standard file descriptors and get rid of controlling tty
+     */
+
+#if defined(SYSV) || defined(SVR4)
+    setpgrp ();
+#else
+    setpgrp (0, getpid());
+#endif
+
+    close (0); 
+    close (1);
+    close (2);
+
+#if !((defined(SYSV) || defined(SVR4)) && defined(i386))
+    if ((i = open ("/dev/tty", O_RDWR)) >= 0) {	/* did open succeed? */
+#if defined(USG) && defined(TCCLRCTTY)
+	int zero = 0;
+	(void) ioctl (i, TCCLRCTTY, &zero);
+#else
+#if (defined(SYSV) || defined(SVR4)) && defined(TIOCTTY)
+	int zero = 0;
+	(void) ioctl (i, TIOCTTY, &zero);
+#else
+	(void) ioctl (i, TIOCNOTTY, (char *) 0);    /* detach, BSD style */
+#endif
+#endif
+	(void) close (i);
+    }
+#endif /* !i386 */
+
+    /*
+     * Set up the standard file descriptors.
+     */
+    (void) open ("/", O_RDONLY);	/* root inode already in core */
+    (void) dup2 (0, 1);
+    (void) dup2 (0, 2);
+}
-- 
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