1 | /* |
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2 | * Copyright (C) 2003 - 2004 Mike Wray <mike.wray@hp.com>. |
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3 | * |
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4 | * This library is free software; you can redistribute it and/or modify |
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5 | * it under the terms of the GNU Lesser General Public License as |
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6 | * published by the Free Software Foundation; either version 2.1 of the |
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7 | * License, or (at your option) any later version. This library is |
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8 | * distributed in the hope that it will be useful, but WITHOUT ANY |
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9 | * WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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10 | * FITNESS FOR A PARTICULAR PURPOSE. |
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11 | * See the GNU Lesser General Public License for more details. |
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12 | * |
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13 | * You should have received a copy of the GNU Lesser General Public License |
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14 | * along with this library; if not, write to the Free Software Foundation, |
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15 | * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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16 | */ |
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17 | #ifndef _VFC_SELECT_H_ |
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18 | #define _VFC_SELECT_H_ |
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19 | |
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20 | /** Set of file descriptors for select. |
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21 | */ |
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22 | typedef struct SelectSet { |
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23 | int n; |
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24 | fd_set rd, wr, er; |
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25 | } SelectSet; |
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26 | |
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27 | enum { |
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28 | SELECT_READ = 1, |
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29 | SELECT_WRITE = 2, |
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30 | SELECT_ERROR = 4, |
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31 | }; |
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32 | |
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33 | extern void SelectSet_zero(SelectSet *set); |
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34 | extern void SelectSet_add(SelectSet *set, int fd, int mode); |
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35 | extern void SelectSet_add_read(SelectSet *set, int fd); |
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36 | extern void SelectSet_add_write(SelectSet *set, int fd); |
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37 | extern void SelectSet_add_error(SelectSet *set, int fd); |
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38 | extern int SelectSet_select(SelectSet *set, struct timeval *timeout); |
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39 | |
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40 | static inline int SelectSet_in(SelectSet *set, int fd){ |
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41 | return ((fd >= 0) |
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42 | ? ((FD_ISSET(fd, &set->rd) ? SELECT_READ : 0) | |
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43 | (FD_ISSET(fd, &set->wr) ? SELECT_WRITE : 0) | |
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44 | (FD_ISSET(fd, &set->er) ? SELECT_ERROR : 0)) |
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45 | : 0); |
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46 | } |
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47 | |
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48 | static inline int SelectSet_in_read(SelectSet *set, int fd){ |
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49 | return (fd >= 0) && FD_ISSET(fd, &set->rd); |
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50 | } |
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51 | |
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52 | static inline int SelectSet_in_write(SelectSet *set, int fd){ |
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53 | return (fd >= 0) && FD_ISSET(fd, &set->wr); |
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54 | } |
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55 | |
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56 | static inline int SelectSet_in_err(SelectSet *set, int fd){ |
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57 | return (fd >= 0) && FD_ISSET(fd, &set->er); |
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58 | } |
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59 | |
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60 | #endif /* ! _VFC_SELECT_H_ */ |
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