chiark / gitweb /
admin: Initialize reference counter for client blocks.
[tripe] / util.c
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410c8acf 1/* -*-c-*-
2 *
b4e56668 3 * $Id: util.c,v 1.3 2004/04/08 01:36:17 mdw Exp $
410c8acf 4 *
5 * Utilities for the client and the server
6 *
7 * (c) 2001 Straylight/Edgeware
8 */
9
10/*----- Licensing notice --------------------------------------------------*
11 *
12 * This file is part of Trivial IP Encryption (TrIPE).
13 *
14 * TrIPE is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * TrIPE is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with TrIPE; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 */
28
410c8acf 29/*----- Header files ------------------------------------------------------*/
30
31#include <errno.h>
32#include <stdio.h>
33#include <stdlib.h>
34#include <string.h>
35
36#include <sys/types.h>
37#include <unistd.h>
38#include <fcntl.h>
39
40#include "util.h"
41
42#include <sys/ioctl.h>
43
44/*----- Main code ---------------------------------------------------------*/
45
b542dd0b 46/* --- @u_detach@ --- *
410c8acf 47 *
48 * Arguments: ---
49 *
b542dd0b 50 * Returns: ---
410c8acf 51 *
b542dd0b 52 * Use: Detaches from the current terminal and ensures it can never
53 * acquire a new one. Calls @fork@.
410c8acf 54 */
55
b542dd0b 56void u_detach(void)
410c8acf 57{
410c8acf 58#ifdef TIOCNOTTY
59 {
60 int fd;
61 if ((fd = open("/dev/tty", O_RDONLY)) >= 0) {
62 ioctl(fd, TIOCNOTTY);
63 close(fd);
64 }
65 }
66#endif
67 setsid();
410c8acf 68 if (fork() > 0)
69 _exit(0);
b542dd0b 70}
71
72/* --- @u_daemon@ --- *
73 *
74 * Arguments: ---
75 *
76 * Returns: Zero if OK, nonzero on failure.
77 *
78 * Use: Becomes a daemon.
79 */
80
81int u_daemon(void)
82{
83 pid_t kid;
84
85 if ((kid = fork()) < 0)
86 return (-1);
87 if (kid)
88 _exit(0);
89 u_detach();
410c8acf 90 return (0);
91}
92
93/*----- That's all, folks -------------------------------------------------*/