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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: util.c,v 1.3 2004/04/08 01:36:17 mdw Exp $ |
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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 | |
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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 | |
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46 | /* --- @u_detach@ --- * |
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47 | * |
48 | * Arguments: --- |
49 | * |
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50 | * Returns: --- |
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51 | * |
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52 | * Use: Detaches from the current terminal and ensures it can never |
53 | * acquire a new one. Calls @fork@. |
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54 | */ |
55 | |
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56 | void u_detach(void) |
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57 | { |
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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(); |
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68 | if (fork() > 0) |
69 | _exit(0); |
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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 | |
81 | int 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(); |
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90 | return (0); |
91 | } |
92 | |
93 | /*----- That's all, folks -------------------------------------------------*/ |