1 /* $Id: daemonize.c,v 1.3 2010/11/11 23:48:13 jmaggard Exp $ */
3 * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
5 * Copyright (c) 2006, Thomas Bernard
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * * The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
30 #include <sys/types.h>
40 #include "daemonize.h"
60 /* obtain a new process group */
61 if( (pid
= setsid()) < 0)
67 /* close all descriptors */
68 for (i
=getdtablesize();i
>=0;--i
) close(i
);
70 i
= open("/dev/null",O_RDWR
); /* open stdin */
75 chdir("/"); /* chdir to /tmp ? */
87 writepidfile(const char * fname
, int pid
)
93 if(!fname
|| (strlen(fname
) == 0))
96 if( (pidfile
= open(fname
, O_WRONLY
|O_CREAT
|O_TRUNC
, 0666)) < 0)
98 DPRINTF(E_INFO
, L_GENERAL
, "Unable to open pidfile for writing %s: %s\n", fname
, strerror(errno
));
102 pidstringlen
= snprintf(pidstring
, sizeof(pidstring
), "%d\n", pid
);
103 if(pidstringlen
<= 0)
105 DPRINTF(E_INFO
, L_GENERAL
,
106 "Unable to write to pidfile %s: snprintf(): FAILED\n", fname
);
112 if(write(pidfile
, pidstring
, pidstringlen
) < 0)
113 DPRINTF(E_INFO
, L_GENERAL
, "Unable to write to pidfile %s: %s\n", fname
, strerror(errno
));
122 checkforrunning(const char * fname
)
128 if(!fname
|| (strlen(fname
) == 0))
131 if( (pidfile
= open(fname
, O_RDONLY
)) < 0)
134 memset(buffer
, 0, 64);
136 if(read(pidfile
, buffer
, 63))
138 if( (pid
= atol(buffer
)) > 0)