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12471842 PL |
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 | */ | |
870a0fe4 AT |
22 | #ifdef HAVE_CONFIG_H |
23 | #include "config.h" | |
24 | #endif | |
e22156da JJS |
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> | |
781d550a BH |
30 | #include <sys/devpoll.h> |
31 | #include "mplexer.hh" | |
32 | #include "sstuff.hh" | |
33 | #include <iostream> | |
34 | #include <unistd.h> | |
35 | #include "misc.hh" | |
781d550a BH |
36 | #include "syncres.hh" |
37 | ||
10f4eea8 | 38 | #include "namespaces.hh" |
781d550a BH |
39 | |
40 | class DevPollFDMultiplexer : public FDMultiplexer | |
41 | { | |
42 | public: | |
43 | DevPollFDMultiplexer(); | |
44 | virtual ~DevPollFDMultiplexer() | |
45 | { | |
46 | close(d_devpollfd); | |
47 | } | |
48 | ||
5bdbb83d RG |
49 | virtual int run(struct timeval* tv, int timeout=500) override; |
50 | virtual void getAvailableFDs(std::vector<int>& fds, int timeout) override; | |
781d550a | 51 | |
27ae2e3c | 52 | virtual void addFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const funcparam_t& parameter, const struct timeval* ttd=nullptr) override; |
5bdbb83d RG |
53 | virtual void removeFD(callbackmap_t& cbmap, int fd) override; |
54 | string getName() const override | |
781d550a BH |
55 | { |
56 | return "/dev/poll"; | |
57 | } | |
58 | private: | |
59 | int d_devpollfd; | |
60 | }; | |
61 | ||
62 | ||
63 | static FDMultiplexer* makeDevPoll() | |
64 | { | |
65 | return new DevPollFDMultiplexer(); | |
66 | } | |
67 | ||
68 | static struct DevPollRegisterOurselves | |
69 | { | |
70 | DevPollRegisterOurselves() { | |
71 | FDMultiplexer::getMultiplexerMap().insert(make_pair(0, &makeDevPoll)); // priority 0! | |
72 | } | |
73 | } doItDevPoll; | |
74 | ||
75 | ||
76 | //int DevPollFDMultiplexer::s_maxevents=1024; | |
77 | DevPollFDMultiplexer::DevPollFDMultiplexer() | |
78 | { | |
79 | d_devpollfd=open("/dev/poll", O_RDWR); | |
80 | if(d_devpollfd < 0) | |
81 | throw FDMultiplexerException("Setting up /dev/poll: "+stringerror()); | |
82 | ||
83 | } | |
84 | ||
27ae2e3c | 85 | void DevPollFDMultiplexer::addFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const funcparam_t& parameter, const struct timeval* ttd) |
781d550a | 86 | { |
27ae2e3c | 87 | accountingAddFD(cbmap, fd, toDo, parameter, ttd); |
781d550a BH |
88 | |
89 | struct pollfd devent; | |
90 | devent.fd=fd; | |
91 | devent.events= (&cbmap == &d_readCallbacks) ? POLLIN : POLLOUT; | |
92 | devent.revents = 0; | |
93 | ||
94 | if(write(d_devpollfd, &devent, sizeof(devent)) != sizeof(devent)) { | |
95 | cbmap.erase(fd); | |
96 | throw FDMultiplexerException("Adding fd to /dev/poll/ set: "+stringerror()); | |
97 | } | |
98 | } | |
99 | ||
100 | void DevPollFDMultiplexer::removeFD(callbackmap_t& cbmap, int fd) | |
101 | { | |
102 | if(!cbmap.erase(fd)) | |
335da0ba | 103 | throw FDMultiplexerException("Tried to remove unlisted fd "+std::to_string(fd)+ " from multiplexer"); |
781d550a BH |
104 | |
105 | struct pollfd devent; | |
106 | devent.fd=fd; | |
107 | devent.events= POLLREMOVE; | |
108 | devent.revents = 0; | |
109 | ||
110 | if(write(d_devpollfd, &devent, sizeof(devent)) != sizeof(devent)) { | |
111 | cbmap.erase(fd); | |
112 | throw FDMultiplexerException("Removing fd from epoll set: "+stringerror()); | |
113 | } | |
114 | } | |
115 | ||
5bdbb83d RG |
116 | void DevPollFDMultiplexer::getAvailableFDs(std::vector<int>& fds, int timeout) |
117 | { | |
118 | struct dvpoll dvp; | |
119 | dvp.dp_nfds = d_readCallbacks.size() + d_writeCallbacks.size(); | |
120 | dvp.dp_fds = new pollfd[dvp.dp_nfds]; | |
121 | dvp.dp_timeout = timeout; | |
122 | int ret=ioctl(d_devpollfd, DP_POLL, &dvp); | |
123 | ||
124 | if(ret < 0 && errno!=EINTR) { | |
125 | delete[] dvp.dp_fds; | |
126 | throw FDMultiplexerException("/dev/poll returned error: "+stringerror()); | |
127 | } | |
128 | ||
129 | for(int n=0; n < ret; ++n) { | |
130 | fds.push_back(dvp.dp_fds[n].fd); | |
131 | } | |
132 | ||
133 | delete[] dvp.dp_fds; | |
134 | } | |
135 | ||
0e663c3b | 136 | int DevPollFDMultiplexer::run(struct timeval* now, int timeout) |
781d550a BH |
137 | { |
138 | if(d_inrun) { | |
139 | throw FDMultiplexerException("FDMultiplexer::run() is not reentrant!\n"); | |
140 | } | |
141 | struct dvpoll dvp; | |
142 | dvp.dp_nfds = d_readCallbacks.size() + d_writeCallbacks.size(); | |
143 | dvp.dp_fds = new pollfd[dvp.dp_nfds]; | |
0e663c3b | 144 | dvp.dp_timeout = timeout; |
5bdbb83d | 145 | int ret=ioctl(d_devpollfd, DP_POLL, &dvp); |
55df795b | 146 | gettimeofday(now,0); // MANDATORY! |
5bdbb83d | 147 | |
6b1933ac JJS |
148 | if(ret < 0 && errno!=EINTR) { |
149 | delete[] dvp.dp_fds; | |
781d550a | 150 | throw FDMultiplexerException("/dev/poll returned error: "+stringerror()); |
6b1933ac | 151 | } |
781d550a | 152 | |
6b1933ac JJS |
153 | if(ret < 1) { // thanks AB! |
154 | delete[] dvp.dp_fds; | |
781d550a | 155 | return 0; |
6b1933ac | 156 | } |
781d550a BH |
157 | |
158 | d_inrun=true; | |
159 | for(int n=0; n < ret; ++n) { | |
160 | d_iter=d_readCallbacks.find(dvp.dp_fds[n].fd); | |
161 | ||
162 | if(d_iter != d_readCallbacks.end()) { | |
ac3da0c2 | 163 | d_iter->d_callback(d_iter->d_fd, d_iter->d_parameter); |
781d550a BH |
164 | continue; // so we don't refind ourselves as writable! |
165 | } | |
166 | d_iter=d_writeCallbacks.find(dvp.dp_fds[n].fd); | |
167 | ||
168 | if(d_iter != d_writeCallbacks.end()) { | |
ac3da0c2 | 169 | d_iter->d_callback(d_iter->d_fd, d_iter->d_parameter); |
781d550a BH |
170 | } |
171 | } | |
172 | delete[] dvp.dp_fds; | |
173 | d_inrun=false; | |
0e663c3b | 174 | return ret; |
781d550a BH |
175 | } |
176 | ||
177 | #if 0 | |
178 | void acceptData(int fd, funcparam_t& parameter) | |
179 | { | |
180 | cout<<"Have data on fd "<<fd<<endl; | |
181 | Socket* sock=funcparam_t_cast<Socket*>(parameter); | |
182 | string packet; | |
183 | IPEndpoint rem; | |
184 | sock->recvFrom(packet, rem); | |
185 | cout<<"Received "<<packet.size()<<" bytes!\n"; | |
186 | } | |
187 | ||
188 | ||
189 | int main() | |
190 | { | |
a5794017 | 191 | Socket s(AF_INET, SOCK_DGRAM); |
781d550a BH |
192 | |
193 | IPEndpoint loc("0.0.0.0", 2000); | |
194 | s.bind(loc); | |
195 | ||
196 | DevPollFDMultiplexer sfm; | |
197 | ||
198 | sfm.addReadFD(s.getHandle(), &acceptData, &s); | |
199 | ||
200 | for(int n=0; n < 100 ; ++n) { | |
201 | sfm.run(); | |
202 | } | |
203 | sfm.removeReadFD(s.getHandle()); | |
204 | sfm.removeReadFD(s.getHandle()); | |
205 | } | |
206 | #endif | |
207 | ||
208 |