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1 | /* | |
2 | * This file is part of PowerDNS or dnsdist. | |
3 | * Copyright -- PowerDNS.COM B.V. and its contributors | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of version 2 of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * In addition, for the avoidance of any doubt, permission is granted to | |
10 | * link this program with OpenSSL and to (re)distribute the binaries | |
11 | * produced as the result of such linking. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
21 | */ | |
22 | #ifdef HAVE_CONFIG_H | |
23 | #include "config.h" | |
24 | #endif | |
25 | /* | |
26 | * NOTE: sys/devpoll.h relies on sigset_t being already defined so we need | |
27 | * to include sys/signal.h *before* including sys/devpoll.h. | |
28 | */ | |
29 | #include <sys/signal.h> | |
30 | #include <sys/devpoll.h> | |
31 | #include "mplexer.hh" | |
32 | #include "sstuff.hh" | |
33 | #include <iostream> | |
34 | #include <unistd.h> | |
35 | #include "misc.hh" | |
36 | ||
37 | #include "namespaces.hh" | |
38 | ||
39 | class DevPollFDMultiplexer : public FDMultiplexer | |
40 | { | |
41 | public: | |
42 | DevPollFDMultiplexer(); | |
43 | virtual ~DevPollFDMultiplexer() | |
44 | { | |
45 | close(d_devpollfd); | |
46 | } | |
47 | ||
48 | virtual int run(struct timeval* tv, int timeout=500) override; | |
49 | virtual void getAvailableFDs(std::vector<int>& fds, int timeout) override; | |
50 | ||
51 | virtual void addFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const funcparam_t& parameter, const struct timeval* ttd=nullptr) override; | |
52 | virtual void removeFD(callbackmap_t& cbmap, int fd) override; | |
53 | string getName() const override | |
54 | { | |
55 | return "/dev/poll"; | |
56 | } | |
57 | private: | |
58 | int d_devpollfd; | |
59 | }; | |
60 | ||
61 | ||
62 | static FDMultiplexer* makeDevPoll() | |
63 | { | |
64 | return new DevPollFDMultiplexer(); | |
65 | } | |
66 | ||
67 | static struct DevPollRegisterOurselves | |
68 | { | |
69 | DevPollRegisterOurselves() { | |
70 | FDMultiplexer::getMultiplexerMap().insert(make_pair(0, &makeDevPoll)); // priority 0! | |
71 | } | |
72 | } doItDevPoll; | |
73 | ||
74 | ||
75 | //int DevPollFDMultiplexer::s_maxevents=1024; | |
76 | DevPollFDMultiplexer::DevPollFDMultiplexer() | |
77 | { | |
78 | d_devpollfd=open("/dev/poll", O_RDWR); | |
79 | if(d_devpollfd < 0) | |
80 | throw FDMultiplexerException("Setting up /dev/poll: "+stringerror()); | |
81 | ||
82 | } | |
83 | ||
84 | void DevPollFDMultiplexer::addFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const funcparam_t& parameter, const struct timeval* ttd) | |
85 | { | |
86 | accountingAddFD(cbmap, fd, toDo, parameter, ttd); | |
87 | ||
88 | struct pollfd devent; | |
89 | devent.fd=fd; | |
90 | devent.events= (&cbmap == &d_readCallbacks) ? POLLIN : POLLOUT; | |
91 | devent.revents = 0; | |
92 | ||
93 | if(write(d_devpollfd, &devent, sizeof(devent)) != sizeof(devent)) { | |
94 | cbmap.erase(fd); | |
95 | throw FDMultiplexerException("Adding fd to /dev/poll/ set: "+stringerror()); | |
96 | } | |
97 | } | |
98 | ||
99 | void DevPollFDMultiplexer::removeFD(callbackmap_t& cbmap, int fd) | |
100 | { | |
101 | if(!cbmap.erase(fd)) | |
102 | throw FDMultiplexerException("Tried to remove unlisted fd "+std::to_string(fd)+ " from multiplexer"); | |
103 | ||
104 | struct pollfd devent; | |
105 | devent.fd=fd; | |
106 | devent.events= POLLREMOVE; | |
107 | devent.revents = 0; | |
108 | ||
109 | if(write(d_devpollfd, &devent, sizeof(devent)) != sizeof(devent)) { | |
110 | cbmap.erase(fd); | |
111 | throw FDMultiplexerException("Removing fd from epoll set: "+stringerror()); | |
112 | } | |
113 | } | |
114 | ||
115 | void DevPollFDMultiplexer::getAvailableFDs(std::vector<int>& fds, int timeout) | |
116 | { | |
117 | struct dvpoll dvp; | |
118 | dvp.dp_nfds = d_readCallbacks.size() + d_writeCallbacks.size(); | |
119 | dvp.dp_fds = new pollfd[dvp.dp_nfds]; | |
120 | dvp.dp_timeout = timeout; | |
121 | int ret=ioctl(d_devpollfd, DP_POLL, &dvp); | |
122 | ||
123 | if(ret < 0 && errno!=EINTR) { | |
124 | delete[] dvp.dp_fds; | |
125 | throw FDMultiplexerException("/dev/poll returned error: "+stringerror()); | |
126 | } | |
127 | ||
128 | for(int n=0; n < ret; ++n) { | |
129 | fds.push_back(dvp.dp_fds[n].fd); | |
130 | } | |
131 | ||
132 | delete[] dvp.dp_fds; | |
133 | } | |
134 | ||
135 | int DevPollFDMultiplexer::run(struct timeval* now, int timeout) | |
136 | { | |
137 | if(d_inrun) { | |
138 | throw FDMultiplexerException("FDMultiplexer::run() is not reentrant!\n"); | |
139 | } | |
140 | struct dvpoll dvp; | |
141 | dvp.dp_nfds = d_readCallbacks.size() + d_writeCallbacks.size(); | |
142 | dvp.dp_fds = new pollfd[dvp.dp_nfds]; | |
143 | dvp.dp_timeout = timeout; | |
144 | int ret=ioctl(d_devpollfd, DP_POLL, &dvp); | |
145 | gettimeofday(now,0); // MANDATORY! | |
146 | ||
147 | if(ret < 0 && errno!=EINTR) { | |
148 | delete[] dvp.dp_fds; | |
149 | throw FDMultiplexerException("/dev/poll returned error: "+stringerror()); | |
150 | } | |
151 | ||
152 | if(ret < 1) { // thanks AB! | |
153 | delete[] dvp.dp_fds; | |
154 | return 0; | |
155 | } | |
156 | ||
157 | d_inrun=true; | |
158 | for(int n=0; n < ret; ++n) { | |
159 | d_iter=d_readCallbacks.find(dvp.dp_fds[n].fd); | |
160 | ||
161 | if(d_iter != d_readCallbacks.end()) { | |
162 | d_iter->d_callback(d_iter->d_fd, d_iter->d_parameter); | |
163 | continue; // so we don't refind ourselves as writable! | |
164 | } | |
165 | d_iter=d_writeCallbacks.find(dvp.dp_fds[n].fd); | |
166 | ||
167 | if(d_iter != d_writeCallbacks.end()) { | |
168 | d_iter->d_callback(d_iter->d_fd, d_iter->d_parameter); | |
169 | } | |
170 | } | |
171 | delete[] dvp.dp_fds; | |
172 | d_inrun=false; | |
173 | return ret; | |
174 | } | |
175 | ||
176 | #if 0 | |
177 | void acceptData(int fd, funcparam_t& parameter) | |
178 | { | |
179 | cout<<"Have data on fd "<<fd<<endl; | |
180 | Socket* sock=funcparam_t_cast<Socket*>(parameter); | |
181 | string packet; | |
182 | IPEndpoint rem; | |
183 | sock->recvFrom(packet, rem); | |
184 | cout<<"Received "<<packet.size()<<" bytes!\n"; | |
185 | } | |
186 | ||
187 | ||
188 | int main() | |
189 | { | |
190 | Socket s(AF_INET, SOCK_DGRAM); | |
191 | ||
192 | IPEndpoint loc("0.0.0.0", 2000); | |
193 | s.bind(loc); | |
194 | ||
195 | DevPollFDMultiplexer sfm; | |
196 | ||
197 | sfm.addReadFD(s.getHandle(), &acceptData, &s); | |
198 | ||
199 | for(int n=0; n < 100 ; ++n) { | |
200 | sfm.run(); | |
201 | } | |
202 | sfm.removeReadFD(s.getHandle()); | |
203 | sfm.removeReadFD(s.getHandle()); | |
204 | } | |
205 | #endif | |
206 | ||
207 |