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132
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1 module tango.sys.linux.epoll;
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2
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3 version (linux)
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4 {
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5 // From <sys/epoll.h>: support for the Linux epoll_*() system calls
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6 extern (C)
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7 {
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8 enum: uint
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9 {
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10 EPOLLIN = 0x001,
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11 EPOLLPRI = 0x002,
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12 EPOLLOUT = 0x004,
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13 EPOLLRDNORM = 0x040,
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14 EPOLLRDBAND = 0x080,
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15 EPOLLWRNORM = 0x100,
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16 EPOLLWRBAND = 0x200,
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17 EPOLLMSG = 0x400,
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18 EPOLLERR = 0x008,
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19 EPOLLHUP = 0x010,
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20 EPOLLONESHOT = (1 << 30),
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21 EPOLLET = (1 << 31)
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22 }
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23
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24 // Valid opcodes ( "op" parameter ) to issue to epoll_ctl().
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25 public const int EPOLL_CTL_ADD = 1; // Add a file descriptor to the interface.
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26 public const int EPOLL_CTL_DEL = 2; // Remove a file descriptor from the interface.
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27 public const int EPOLL_CTL_MOD = 3; // Change file descriptor epoll_event structure.
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28
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29 align(1) union epoll_data
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30 {
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31 void* ptr;
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32 int fd;
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33 uint u32;
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34 ulong u64;
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35 }
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36
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37 alias epoll_data epoll_data_t;
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38
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39 align(1) struct epoll_event
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40 {
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41 uint events; // Epoll events
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42 epoll_data_t data; // User data variable
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43 }
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44
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45 // Creates an epoll instance. Returns an fd for the new instance.
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46 // The "size" parameter is a hint specifying the number of file
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47 // descriptors to be associated with the new instance. The fd
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48 // returned by epoll_create() should be closed with close().
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49 int epoll_create(int size);
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50
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51 // Manipulate an epoll instance "epfd". Returns 0 in case of success,
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52 // -1 in case of error (the "errno" variable will contain the
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53 // specific error code) The "op" parameter is one of the EPOLL_CTL_*
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54 // constants defined above. The "fd" parameter is the target of the
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55 // operation. The "event" parameter describes which events the caller
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56 // is interested in and any associated user data.
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57 int epoll_ctl(int epfd, int op, int fd, epoll_event* event);
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58
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59 // Wait for events on an epoll instance "epfd". Returns the number of
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60 // triggered events returned in "events" buffer. Or -1 in case of
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61 // error with the "errno" variable set to the specific error code. The
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62 // "events" parameter is a buffer that will contain triggered
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63 // events. The "maxevents" is the maximum number of events to be
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64 // returned (usually size of "events"). The "timeout" parameter
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65 // specifies the maximum wait time in milliseconds (-1 == infinite).
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66 int epoll_wait(int epfd, epoll_event* events, int maxevents, int timeout);
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67 }
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68 }
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