1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*
* Copyright (C) 2003-2008 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "daemon.h"
#include "conf.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifndef WIN32
#include <signal.h>
#include <pwd.h>
#include <grp.h>
#endif
void
daemonize_kill(void)
{
#ifndef WIN32
FILE *fp;
struct config_param *param =
parseConfigFilePath(CONF_PID_FILE, 0);
int pid, ret;
if (param == NULL)
g_error("no pid_file specified in the config file");
fp = fopen(param->value, "r");
if (fp == NULL)
g_error("unable to open %s \"%s\": %s",
CONF_PID_FILE, param->value, g_strerror(errno));
if (fscanf(fp, "%i", &pid) != 1) {
g_error("unable to read the pid from file \"%s\"",
param->value);
}
fclose(fp);
ret = kill(pid, SIGTERM);
if (ret < 0)
g_error("unable to kill proccess %i: %s",
pid, g_strerror(errno));
exit(EXIT_SUCCESS);
#else
g_error("--kill is not available on WIN32");
#endif
}
void
daemonize_close_stdin(void)
{
int fd = open("/dev/null", O_RDONLY);
if (fd < 0)
close(STDIN_FILENO);
else if (fd != STDIN_FILENO) {
dup2(fd, STDIN_FILENO);
close(fd);
}
}
void
daemonize_set_user(void)
{
#ifndef WIN32
struct config_param *param = config_get_param(CONF_USER);
if (param && strlen(param->value)) {
/* get uid */
struct passwd *userpwd;
if ((userpwd = getpwnam(param->value)) == NULL) {
g_error("no such user \"%s\" at line %i",
param->value, param->line);
}
if (setgid(userpwd->pw_gid) == -1) {
g_error("cannot setgid for user \"%s\" at line %i: %s",
param->value, param->line, strerror(errno));
}
#ifdef _BSD_SOURCE
/* init suplementary groups
* (must be done before we change our uid)
*/
if (initgroups(param->value, userpwd->pw_gid) == -1) {
g_warning("cannot init supplementary groups "
"of user \"%s\" at line %i: %s",
param->value, param->line, strerror(errno));
}
#endif
/* set uid */
if (setuid(userpwd->pw_uid) == -1) {
g_error("cannot change to uid of user "
"\"%s\" at line %i: %s",
param->value, param->line, strerror(errno));
}
/* this is needed by libs such as arts */
if (userpwd->pw_dir) {
g_setenv("HOME", userpwd->pw_dir, true);
}
}
#endif
}
void
daemonize(Options *options)
{
#ifndef WIN32
FILE *fp = NULL;
struct config_param *pidFileParam =
parseConfigFilePath(CONF_PID_FILE, 0);
if (pidFileParam) {
/* do this before daemon'izing so we can fail gracefully if we can't
* write to the pid file */
g_debug("opening pid file");
fp = fopen(pidFileParam->value, "w+");
if (!fp) {
g_error("could not open %s \"%s\" (at line %i) for writing: %s",
CONF_PID_FILE, pidFileParam->value,
pidFileParam->line, strerror(errno));
}
}
if (options->daemon) {
int pid;
fflush(NULL);
pid = fork();
if (pid > 0)
_exit(EXIT_SUCCESS);
else if (pid < 0) {
g_error("problems fork'ing for daemon!");
}
if (chdir("/") < 0) {
g_error("problems changing to root directory");
}
setsid();
g_debug("daemonized!");
}
if (pidFileParam) {
g_debug("writing pid file");
fprintf(fp, "%lu\n", (unsigned long)getpid());
fclose(fp);
}
#else
/* no daemonization on WIN32 */
(void)options;
#endif
}
void
daemonize_delete_pidfile(void)
{
struct config_param *param = parseConfigFilePath(CONF_PID_FILE, 0);
if (param == NULL)
return;
g_debug("cleaning up pid file");
unlink(param->value);
}
|
