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1 office 1 /**
2 * @file BThreadSignal.c
3 * @author Ambroz Bizjak <ambrop7@gmail.com>
4 *
5 * @section LICENSE
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the author nor the
15 * names of its contributors may be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29  
30 #include <errno.h>
31 #include <unistd.h>
32  
33 #include <misc/debug.h>
34 #include <misc/nonblocking.h>
35 #include <base/BLog.h>
36  
37 #include "BThreadSignal.h"
38  
39 #include <generated/blog_channel_BThreadSignal.h>
40  
41 static void bfd_handler (void *user, int events)
42 {
43 BThreadSignal *o = user;
44 DebugObject_Access(&o->d_obj);
45  
46 char byte;
47 ssize_t res = read(o->pipe[0], &byte, sizeof(byte));
48  
49 if (res < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) {
50 return;
51 }
52  
53 if (res < 0) {
54 BLog(BLOG_ERROR, "read failed");
55 return;
56 }
57  
58 if (res != sizeof(byte)) {
59 BLog(BLOG_ERROR, "bad read");
60 return;
61 }
62  
63 o->handler(o);
64 }
65  
66 int BThreadSignal_Init (BThreadSignal *o, BReactor *reactor, BThreadSignal_handler handler)
67 {
68 o->reactor = reactor;
69 o->handler = handler;
70  
71 if (pipe(o->pipe) < 0) {
72 BLog(BLOG_ERROR, "pipe failed");
73 goto fail0;
74 }
75  
76 if (!badvpn_set_nonblocking(o->pipe[0]) || !badvpn_set_nonblocking(o->pipe[1])) {
77 BLog(BLOG_ERROR, "badvpn_set_nonblocking failed");
78 goto fail1;
79 }
80  
81 BFileDescriptor_Init(&o->bfd, o->pipe[0], bfd_handler, o);
82  
83 if (!BReactor_AddFileDescriptor(o->reactor, &o->bfd)) {
84 BLog(BLOG_ERROR, "BReactor_AddFileDescriptor failed");
85 goto fail1;
86 }
87  
88 BReactor_SetFileDescriptorEvents(o->reactor, &o->bfd, BREACTOR_READ);
89  
90 DebugObject_Init(&o->d_obj);
91 return 1;
92  
93 fail1:
94 if (close(o->pipe[1]) < 0) {
95 BLog(BLOG_ERROR, "close failed");
96 }
97 if (close(o->pipe[0]) < 0) {
98 BLog(BLOG_ERROR, "close failed");
99 }
100 fail0:
101 return 0;
102 }
103  
104 void BThreadSignal_Free (BThreadSignal *o)
105 {
106 DebugObject_Free(&o->d_obj);
107  
108 BReactor_RemoveFileDescriptor(o->reactor, &o->bfd);
109  
110 if (close(o->pipe[1]) < 0) {
111 BLog(BLOG_ERROR, "close failed");
112 }
113 if (close(o->pipe[0]) < 0) {
114 BLog(BLOG_ERROR, "close failed");
115 }
116 }
117  
118 int BThreadSignal_Thread_Signal (BThreadSignal *o)
119 {
120 DebugObject_Access(&o->d_obj);
121  
122 char byte = 0;
123 ssize_t res = write(o->pipe[1], &byte, sizeof(byte));
124  
125 if (res < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) {
126 return 0;
127 }
128  
129 if (res < 0) {
130 BLog(BLOG_ERROR, "write failed");
131 } else if (res != sizeof(byte)) {
132 BLog(BLOG_ERROR, "bad write");
133 }
134  
135 return 1;
136 }