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gdaemon_unix.cpp
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1 //
2 // Copyright (C) 2001-2013 Graeme Walker <graeme_walker@users.sourceforge.net>
3 //
4 // This program is free software: you can redistribute it and/or modify
5 // it under the terms of the GNU General Public License as published by
6 // the Free Software Foundation, either version 3 of the License, or
7 // (at your option) any later version.
8 //
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
13 //
14 // You should have received a copy of the GNU General Public License
15 // along with this program. If not, see <http://www.gnu.org/licenses/>.
16 // ===
17 //
18 // gdaemon_unix.cpp
19 //
20
21 #include "gdef.h"
22 #include "gdaemon.h"
23 #include "gprocess.h"
24 #include "gnewprocess.h"
25
26 void G::Daemon::detach( PidFile & pid_file )
27 {
28 pid_file.check() ; // absolute path
29 detach() ;
30 }
31
32 void G::Daemon::detach()
33 {
34 // see Stevens, ISBN 0-201-563137-7, ch 13.
35
36 if( NewProcess::fork() == NewProcess::Parent )
37 ::_exit( 0 ) ;
38
39 setsid() ;
40 G_IGNORE_RETURN(bool) Process::cd( "/" , Process::NoThrow() ) ;
41
42 if( NewProcess::fork() == NewProcess::Parent )
43 ::_exit( 0 ) ;
44 }
45
46 void G::Daemon::setsid()
47 {
48 G_IGNORE_RETURN(pid_t) ::setsid() ;
49 }
50
G::PidFile::check
void check()
Throws an exception if the path is not absolute.
Definition: gpidfile.cpp:92
G::NewProcess::Parent
Definition: gnewprocess.h:53
G::Process::NoThrow
An overload discriminator for Process.
Definition: gprocess.h:76
G::NewProcess::fork
static Who fork()
Forks a child process.
Definition: gnewprocess_unix_exec_enabled.cpp:134
gprocess.h
gnewprocess.h
gdaemon.h
G::Daemon::detach
static void detach()
Detaches from the parent environment.
Definition: gdaemon_unix.cpp:32
G::Process::cd
static void cd(const Path &dir)
Changes directory.
Definition: gprocess_unix.cpp:52
G::PidFile
A class for creating pid files.
Definition: gpidfile.h:56