1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28 #include <stdlib.h>
29 #include <unistd.h>
30 #include <fcntl.h>
31
daemon(int nochdir,int noclose)32 int daemon( int nochdir, int noclose )
33 {
34 pid_t pid;
35
36 if ( !nochdir && chdir("/") != 0 )
37 return -1;
38
39 if ( !noclose )
40 {
41 int fd = open("/dev/null", O_RDWR);
42
43 if ( fd < 0 )
44 return -1;
45
46 if ( dup2( fd, 0 ) < 0 ||
47 dup2( fd, 1 ) < 0 ||
48 dup2( fd, 2 ) < 0 )
49 {
50 close(fd);
51 return -1;
52 }
53 close(fd);
54 }
55
56 pid = fork();
57 if (pid < 0)
58 return -1;
59
60 if (pid > 0)
61 _exit(0);
62
63 if ( setsid() < 0 )
64 return -1;
65
66 return 0;
67 }
68
69