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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