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1 | /* for broken bsd's */ |
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2 | #include <sys/time.h> |
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3 | #include <sys/types.h> |
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4 | #include <unistd.h> |
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5 | |
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6 | /* for unix systems */ |
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7 | #include <sys/select.h> |
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8 | |
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9 | #include <string.h> |
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10 | #include <inttypes.h> |
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11 | |
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12 | static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo; |
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13 | static int vec_max; |
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14 | |
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15 | static void |
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16 | select_modify (int fd, int oev, int nev) |
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17 | { |
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18 | int offs = fd >> 3; |
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19 | int mask = 1 << (fd & 7); |
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20 | |
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21 | if (vec_max < (fd >> 5) + 1) |
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22 | { |
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23 | vec_max = (fd >> 5) + 1; |
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24 | |
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25 | vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); |
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26 | vec_ro = (unsigned char *)realloc (vec_ro, vec_max * 4); /* could free/malloc */ |
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27 | vec_wi = (unsigned char *)realloc (vec_wi, vec_max * 4); |
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28 | vec_wo = (unsigned char *)realloc (vec_wo, vec_max * 4); /* could free/malloc */ |
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29 | } |
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30 | |
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31 | vec_ri [offs] |= mask; |
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32 | if (!(nev & EV_READ)) |
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33 | vec_ri [offs] &= ~mask; |
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34 | |
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35 | vec_wi [offs] |= mask; |
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36 | if (!(nev & EV_WRITE)) |
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37 | vec_wi [offs] &= ~mask; |
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38 | } |
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39 | |
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40 | static void select_poll (ev_tstamp timeout) |
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41 | { |
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42 | struct timeval tv; |
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43 | int res; |
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44 | |
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45 | memcpy (vec_ro, vec_ri, vec_max * 4); |
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46 | memcpy (vec_wo, vec_wi, vec_max * 4); |
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47 | |
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48 | tv.tv_sec = (long)timeout; |
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49 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
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50 | |
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51 | res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
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52 | |
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53 | if (res > 0) |
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54 | { |
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55 | int word, offs; |
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56 | |
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57 | for (word = vec_max; word--; ) |
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58 | { |
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59 | if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word]) |
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60 | for (offs = 4; offs--; ) |
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61 | { |
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62 | int idx = word * 4 + offs; |
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63 | unsigned char byte_r = vec_ro [idx]; |
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64 | unsigned char byte_w = vec_wo [idx]; |
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65 | int bit; |
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66 | |
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67 | if (byte_r | byte_w) |
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68 | for (bit = 8; bit--; ) |
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69 | { |
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70 | int events = 0; |
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71 | events |= byte_r & (1 << bit) ? EV_READ : 0; |
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72 | events |= byte_w & (1 << bit) ? EV_WRITE : 0; |
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73 | |
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74 | if (events) |
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75 | fd_event (idx * 8 + bit, events); |
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76 | } |
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77 | } |
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78 | } |
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79 | } |
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80 | } |
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81 | |
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82 | int select_init (int flags) |
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83 | { |
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84 | ev_method = EVMETHOD_SELECT; |
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85 | method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ |
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86 | method_modify = select_modify; |
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87 | method_poll = select_poll; |
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88 | |
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89 | return 1; |
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90 | } |
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91 | |
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92 | |
