[9c7a701] | 1 | #include "owl.h" |
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| 2 | |
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| 3 | static const char fileIdent[] = "$Id: select.c 894 2008-01-17 07:13:44Z asedeno $"; |
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| 4 | |
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| 5 | /* Returns the index of the dispatch for the file descriptor. */ |
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| 6 | int owl_select_find_dispatch(int fd) |
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| 7 | { |
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| 8 | int i, len; |
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| 9 | owl_list *dl; |
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| 10 | owl_dispatch *d; |
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| 11 | |
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| 12 | dl = owl_global_get_dispatchlist(&g); |
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| 13 | len = owl_list_get_size(dl); |
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| 14 | for(i = 0; i < len; i++) { |
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| 15 | d = (owl_dispatch*)owl_list_get_element(dl, i); |
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| 16 | if (d->fd == fd) return i; |
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| 17 | } |
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| 18 | return -1; |
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| 19 | } |
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| 20 | |
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| 21 | /* Adds a new owl_dispatch to the list, replacing existing ones if needed. */ |
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| 22 | void owl_select_add_dispatch(owl_dispatch *d) |
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| 23 | { |
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| 24 | int elt; |
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| 25 | owl_list *dl; |
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| 26 | |
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| 27 | elt = owl_select_find_dispatch(d->fd); |
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| 28 | dl = owl_global_get_dispatchlist(&g); |
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| 29 | |
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| 30 | if (elt != -1) { /* If we have a dispatch for this FD */ |
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| 31 | owl_dispatch *d_old; |
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| 32 | d_old = (owl_dispatch*)owl_list_get_element(dl, elt); |
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| 33 | /* Ignore if we're adding the same dispatch again. Otherwise |
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| 34 | replace the old dispatch. */ |
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| 35 | if (d_old != d) { |
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| 36 | owl_list_replace_element(dl, elt, d); |
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| 37 | owl_free(d_old); |
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| 38 | } |
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| 39 | } |
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| 40 | else { |
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| 41 | owl_list_append_element(dl, d); |
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| 42 | } |
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| 43 | } |
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| 44 | |
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| 45 | /* Removes an owl_dispatch to the list, based on it's file descriptor. */ |
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| 46 | void owl_select_remove_dispatch(int fd) |
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| 47 | { |
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| 48 | int elt; |
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| 49 | owl_list *dl; |
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| 50 | |
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| 51 | elt = owl_select_find_dispatch(fd); |
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| 52 | dl = owl_global_get_dispatchlist(&g); |
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| 53 | |
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| 54 | if (elt != -1) { |
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| 55 | owl_dispatch *d; |
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| 56 | d = (owl_dispatch*)owl_list_get_element(dl, elt); |
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| 57 | owl_list_remove_element(dl, elt); |
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| 58 | if (d->pfunc) { |
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| 59 | owl_perlconfig_dispatch_free(d); |
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| 60 | } |
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| 61 | owl_free(d); |
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| 62 | } |
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| 63 | } |
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| 64 | |
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| 65 | int owl_select_dispatch_count() |
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| 66 | { |
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| 67 | return owl_list_get_size(owl_global_get_dispatchlist(&g)); |
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| 68 | } |
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| 69 | |
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| 70 | int owl_select_add_perl_dispatch(int fd, SV *cb) |
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| 71 | { |
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| 72 | int elt; |
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| 73 | owl_dispatch *d; |
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| 74 | elt = owl_select_find_dispatch(fd); |
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| 75 | if (elt != -1) { |
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| 76 | d = (owl_dispatch*)owl_list_get_element(owl_global_get_dispatchlist(&g), elt); |
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| 77 | if (d->pfunc == NULL) { |
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| 78 | /* don't mess with non-perl dispatch functions from here. */ |
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| 79 | return 1; |
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| 80 | } |
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| 81 | } |
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| 82 | |
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| 83 | d = malloc(sizeof(owl_dispatch)); |
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| 84 | d->fd = fd; |
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| 85 | d->cfunc = NULL; |
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| 86 | d->pfunc = cb; |
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| 87 | owl_select_add_dispatch(d); |
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| 88 | return 0; |
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| 89 | } |
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| 90 | |
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| 91 | int owl_select_remove_perl_dispatch(int fd) |
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| 92 | { |
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| 93 | int elt; |
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| 94 | owl_dispatch *d; |
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| 95 | |
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| 96 | elt = owl_select_find_dispatch(fd); |
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| 97 | if (elt != -1) { |
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| 98 | d = (owl_dispatch*)owl_list_get_element(owl_global_get_dispatchlist(&g), elt); |
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| 99 | if (d->pfunc != NULL) { |
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| 100 | owl_select_remove_dispatch(fd); |
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| 101 | return 0; |
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| 102 | } |
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| 103 | } |
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| 104 | return 1; |
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| 105 | } |
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| 106 | |
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[2f69081] | 107 | int owl_select_dispatch_prepare_fd_sets(fd_set *r, fd_set *e) |
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[9c7a701] | 108 | { |
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| 109 | int i, len, max_fd; |
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| 110 | owl_dispatch *d; |
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| 111 | owl_list *dl; |
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| 112 | |
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| 113 | dl = owl_global_get_dispatchlist(&g); |
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| 114 | FD_ZERO(r); |
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| 115 | FD_ZERO(e); |
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| 116 | max_fd = 0; |
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| 117 | len = owl_select_dispatch_count(g); |
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| 118 | for(i = 0; i < len; i++) { |
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| 119 | d = (owl_dispatch*)owl_list_get_element(dl, i); |
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| 120 | FD_SET(d->fd, r); |
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| 121 | FD_SET(d->fd, e); |
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| 122 | if (max_fd < d->fd) max_fd = d->fd; |
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| 123 | } |
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| 124 | return max_fd + 1; |
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| 125 | } |
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| 126 | |
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| 127 | void owl_select_dispatch(fd_set *fds, int max_fd) |
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| 128 | { |
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| 129 | int i, len; |
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| 130 | owl_dispatch *d; |
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| 131 | owl_list *dl; |
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| 132 | |
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| 133 | dl = owl_global_get_dispatchlist(&g); |
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| 134 | len = owl_select_dispatch_count(); |
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| 135 | for(i = 0; i < len; i++) { |
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| 136 | d = (owl_dispatch*)owl_list_get_element(dl, i); |
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[18a54ee] | 137 | /* While d shouldn't normally be null, the list may be altered by |
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| 138 | * functions we dispatch to. */ |
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| 139 | if (d != NULL && FD_ISSET(d->fd, fds)) { |
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[9c7a701] | 140 | if (d->cfunc != NULL) { |
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| 141 | (d->cfunc)(); |
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| 142 | } |
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| 143 | else if (d->pfunc != NULL) { |
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| 144 | owl_perlconfig_do_dispatch(d); |
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| 145 | } |
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| 146 | } |
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| 147 | } |
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| 148 | } |
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| 149 | |
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| 150 | void owl_select() |
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| 151 | { |
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[c453ada] | 152 | int max_fd; |
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[9c7a701] | 153 | fd_set r; |
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| 154 | fd_set e; |
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| 155 | struct timeval timeout; |
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| 156 | |
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| 157 | timeout.tv_sec = 1; |
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| 158 | timeout.tv_usec = 0; |
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| 159 | |
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[2f69081] | 160 | max_fd = owl_select_dispatch_prepare_fd_sets(&r, &e); |
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[9c7a701] | 161 | |
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[c453ada] | 162 | if ( select(max_fd+1, &r, NULL, &e, &timeout) ) { |
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[9c7a701] | 163 | /* NOTE: the same dispatch function is called for both exceptional |
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| 164 | and read ready FDs. */ |
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| 165 | owl_select_dispatch(&r, max_fd); |
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| 166 | } |
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| 167 | } |
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