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
|
/*
* Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by John Birrell.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <signal.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#ifdef _THREAD_SAFE
#include <pthread.h>
#include "pthread_private.h"
void
_thread_sig_handler(int sig, int code, struct sigcontext * scp)
{
char c;
int i;
pthread_t pthread;
/*
* Check if the pthread kernel has unblocked signals (or is about to)
* and was on its way into a _thread_sys_select when the current
* signal interrupted it:
*/
if (_thread_kern_in_select) {
/* Cast the signal number to a character variable: */
c = sig;
/*
* Write the signal number to the kernel pipe so that it will
* be ready to read when this signal handler returns. This
* means that the _thread_sys_select call will complete
* immediately.
*/
if (_thread_sys_write(_thread_kern_pipe[1], &c, 1) != 1) {
}
}
/* Check if the signal requires a dump of thread information: */
if (sig == SIGINFO) {
/* Dump thread information to file: */
_thread_dump_info();
} else {
/* Handle depending on signal type: */
switch (sig) {
/* Interval timer used for timeslicing: */
case SIGVTALRM:
/*
* Don't add the signal to any thread. Just want to
* call the scheduler:
*/
break;
/* Child termination: */
case SIGCHLD:
/*
* Enter a loop to process each thread in the linked
* list:
*/
for (pthread = _thread_link_list; pthread != NULL;
pthread = pthread->nxt) {
/*
* Add the signal to the set of pending
* signals:
*/
pthread->sigpend[sig] += 1;
if (pthread->state == PS_WAIT_WAIT) {
/* Reset the error: */
/* There should be another flag so that this is not required! ### */
_thread_seterrno(pthread, 0);
/* Change the state of the thread to run: */
PTHREAD_NEW_STATE(pthread,PS_RUNNING);
}
}
/*
* Go through the file list and set all files
* to non-blocking again in case the child
* set some of them to block. Sigh.
*/
for (i = 0; i < _thread_dtablesize; i++) {
/* Check if this file is used: */
if (_thread_fd_table[i] != NULL) {
/* Set the file descriptor to non-blocking: */
_thread_sys_fcntl(i, F_SETFL, _thread_fd_table[i]->flags | O_NONBLOCK);
}
}
break;
/* Signals specific to the running thread: */
case SIGBUS:
case SIGEMT:
case SIGFPE:
case SIGILL:
case SIGPIPE:
case SIGSEGV:
case SIGSYS:
/* Add the signal to the set of pending signals: */
_thread_run->sigpend[sig] += 1;
break;
/* Signals to send to all threads: */
default:
/*
* Enter a loop to process each thread in the linked
* list:
*/
for (pthread = _thread_link_list; pthread != NULL;
pthread = pthread->nxt) {
/*
* Add the signal to the set of pending
* signals:
*/
pthread->sigpend[sig] += 1;
}
break;
}
/* Check if the kernel is not locked: */
if (_thread_run != &_thread_kern_thread) {
/*
* Schedule the next thread. This function is not
* expected to return because it will do a longjmp
* instead.
*/
_thread_kern_sched(scp);
/*
* This point should not be reached, so abort the
* process:
*/
PANIC("Returned to signal function from scheduler");
}
}
/* Returns nothing. */
return;
}
#endif
|
