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
191
192
193
194
195
196
|
/*
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., 675 Mass Ave, Cambridge, MA 02139, USA.
xrdp: A Remote Desktop Protocol server.
Copyright (C) Jay Sorg 2005-2010
*/
/**
*
* @file sig.c
* @brief signal handling functions
* @author Jay Sorg, Simone Fedele
*
*/
#include "sesman.h"
#include "signal.h"
extern int g_sck;
extern int g_pid;
extern struct config_sesman* g_cfg; /* in sesman.c */
extern tbus g_term_event;
/******************************************************************************/
void DEFAULT_CC
sig_sesman_shutdown(int sig)
{
char pid_file[256];
log_message(&(g_cfg->log), LOG_LEVEL_INFO, "shutting down sesman %d", 1);
if (g_getpid() != g_pid)
{
LOG_DBG(&(g_cfg->log), "g_getpid() [%d] differs from g_pid [%d]", (g_getpid()), g_pid);
return;
}
LOG_DBG(&(g_cfg->log), " - getting signal %d pid %d", sig, g_getpid());
g_set_wait_obj(g_term_event);
g_tcp_close(g_sck);
session_sigkill_all();
g_snprintf(pid_file, 255, "%s/xrdp-sesman.pid", XRDP_PID_PATH);
g_file_delete(pid_file);
}
/******************************************************************************/
void DEFAULT_CC
sig_sesman_reload_cfg(int sig)
{
int error;
struct config_sesman *cfg;
log_message(&(g_cfg->log), LOG_LEVEL_WARNING, "receiving SIGHUP %d", 1);
if (g_getpid() != g_pid)
{
LOG_DBG(&(g_cfg->log), "g_getpid() [%d] differs from g_pid [%d]", g_getpid(), g_pid);
return;
}
cfg = g_malloc(sizeof(struct config_sesman), 1);
if (0 == cfg)
{
log_message(&(g_cfg->log), LOG_LEVEL_ERROR, "error creating new config: - keeping old cfg");
return;
}
if (config_read(cfg) != 0)
{
log_message(&(g_cfg->log), LOG_LEVEL_ERROR, "error reading config - keeping old cfg");
return;
}
/* stop logging subsystem */
log_end(&(g_cfg->log));
/* replace old config with new readed one */
g_cfg = cfg;
/* start again logging subsystem */
error = log_start(&(g_cfg->log));
if (error != LOG_STARTUP_OK)
{
switch (error)
{
case LOG_ERROR_MALLOC:
g_printf("error on malloc. cannot restart logging. log stops here, sorry.\n");
break;
case LOG_ERROR_FILE_OPEN:
g_printf("error reopening log file [%s]. log stops here, sorry.\n", g_cfg->log.log_file);
break;
}
}
log_message(&(g_cfg->log), LOG_LEVEL_INFO, "configuration reloaded, log subsystem restarted");
}
/******************************************************************************/
void DEFAULT_CC
sig_sesman_session_end(int sig)
{
int pid;
if (g_getpid() != g_pid)
{
return;
}
pid = g_waitchild();
if (pid > 0)
{
session_kill(pid);
}
}
/******************************************************************************/
void* DEFAULT_CC
sig_handler_thread(void* arg)
{
int recv_signal;
sigset_t sigmask;
sigset_t oldmask;
sigset_t waitmask;
/* mask signals to be able to wait for them... */
sigfillset(&sigmask);
/* it is a good idea not to block SIGILL SIGSEGV */
/* SIGFPE -- see sigaction(2) NOTES */
pthread_sigmask(SIG_BLOCK, &sigmask, &oldmask);
/* building the signal wait mask... */
sigemptyset(&waitmask);
sigaddset(&waitmask, SIGHUP);
sigaddset(&waitmask, SIGCHLD);
sigaddset(&waitmask, SIGTERM);
sigaddset(&waitmask, SIGKILL);
sigaddset(&waitmask, SIGINT);
// sigaddset(&waitmask, SIGFPE);
// sigaddset(&waitmask, SIGILL);
// sigaddset(&waitmask, SIGSEGV);
do
{
LOG_DBG(&(g_cfg->log), "calling sigwait()",0);
sigwait(&waitmask, &recv_signal);
switch (recv_signal)
{
case SIGHUP:
//reload cfg
//we must stop & restart logging, or copy logging cfg!!!!
LOG_DBG(&(g_cfg->log), "sesman received SIGHUP", 0);
//return 0;
break;
case SIGCHLD:
/* a session died */
LOG_DBG(&(g_cfg->log), "sesman received SIGCHLD", 0);
sig_sesman_session_end(SIGCHLD);
break;
case SIGINT:
/* we die */
LOG_DBG(&(g_cfg->log), "sesman received SIGINT", 0);
sig_sesman_shutdown(recv_signal);
break;
case SIGKILL:
/* we die */
LOG_DBG(&(g_cfg->log), "sesman received SIGKILL", 0);
sig_sesman_shutdown(recv_signal);
break;
case SIGTERM:
/* we die */
LOG_DBG(&(g_cfg->log), "sesman received SIGTERM", 0);
sig_sesman_shutdown(recv_signal);
break;
}
} while (1);
return 0;
}
|
