/*
* Empire - A multi-player, client/server Internet based war game.
- * Copyright (C) 1986-2005, Dave Pare, Jeff Bailey, Thomas Ruschak,
+ * Copyright (C) 1986-2008, Dave Pare, Jeff Bailey, Thomas Ruschak,
* Ken Stevens, Steve McClure
*
* This program is free software; you can redistribute it and/or modify
*
* ---
*
- * See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
- * related information and legal notices. It is expected that any future
- * projects/authors will amend these files as needed.
+ * See files README, COPYING and CREDITS in the root of the source
+ * tree for related information and legal notices. It is expected
+ * that future projects/authors will amend these files as needed.
*
* ---
*
- * disassoc.c: Fork and close
- *
+ * disassoc.c: Boilerplate daemonization code
+ *
* Known contributors to this file:
* Doug Hay, 1998
+ * Markus Armbruster, 2005
*/
/*
- * boilerplate daemon code; disassociate from
- * the current tty by forking, closing all file
- * descriptors, opening slash, and ioctl-ing
- * TIOCNOTTY
+ * See W. Richard Stevens: UNIX Network Programming, Vol. 1
*/
-#include <sys/types.h>
-#if !defined(_WIN32)
-#include <sys/ioctl.h>
-#include <unistd.h> /* fork close dup2 */
-#endif
+#include <config.h>
+
+#ifndef _WIN32
#include <fcntl.h>
-#include "gen.h"
+#include <sys/types.h>
+#include <unistd.h>
+#include "prototypes.h"
-void
+int
disassoc(void)
{
-#if !defined(_WIN32)
+ pid_t pid;
int i;
- if (fork() != 0)
- exit(0);
- for (i = 0; i < 2; i++)
- (void)close(i);
- (void)open("/", O_RDONLY, 0);
- (void)dup2(0, 1);
- (void)dup2(0, 2);
-#if defined hpux || defined Rel4
- setsid();
-#else
- i = open("/dev/tty", O_RDWR, 0);
- if (i > 0) {
- (void)ioctl(i, TIOCNOTTY, 0);
- (void)close(i);
- }
-#endif
-#endif
+ if ((pid = fork()) < 0)
+ return -1;
+ else if (pid)
+ _exit(0); /* parent */
+
+ /* Become session leader of new session, lose controlling tty */
+ if (setsid() < 0)
+ return -1;
+
+ /* Lose session leader status, so we can't acquire a controlling tty */
+ if ((pid = fork()) < 0)
+ return -1;
+ else if (pid)
+ _exit(0); /* parent */
+ /* Note: no controlling tty, therefore no SIGHUP sent */
+
+ /* datadir is working directory, that's fine */
+
+ /* We opened a bunch of files already, so just close 0..2 */
+ for (i = 0; i < 3; i++)
+ close(i);
+
+ /* Library code may use 0..2; make sure that's safe */
+ open("/dev/null", O_RDWR);
+ dup(0);
+ dup(0);
+
+ return 0;
}
+#endif