1 /* 2 * Copyright 2002-2006, Haiku Inc. All Rights Reserved. 3 * Distributed under the terms of the MIT License. 4 */ 5 #ifndef _SYS_SELECT_H 6 #define _SYS_SELECT_H 7 8 9 #include <sys/time.h> 10 #include <signal.h> 11 12 13 /* If FD_SET is already defined, only the select() prototype is 14 * exported in this header. 15 */ 16 #ifndef FD_SET 17 18 /* You can define your own FDSETSIZE if you need more bits - but 19 * it should be enough for most uses. 20 */ 21 #ifndef FD_SETSIZE 22 # define FD_SETSIZE 1024 23 #endif 24 25 typedef unsigned long fd_mask; 26 27 #ifndef _howmany 28 # define _howmany(x, y) (((x) + ((y) - 1)) / (y)) 29 #endif 30 31 #ifndef howmany 32 # define howmany(x, y) (((x) + ((y) - 1)) / (y)) 33 #endif 34 35 #define NFDBITS (sizeof(fd_mask) * 8) /* bits per mask */ 36 37 typedef struct fd_set { 38 fd_mask bits[_howmany(FD_SETSIZE, NFDBITS)]; 39 } fd_set; 40 41 #define _FD_BITSINDEX(fd) ((fd) / NFDBITS) 42 #define _FD_BIT(fd) (1L << ((fd) % NFDBITS)) 43 44 #define FD_ZERO(set) memset((set), 0, sizeof(fd_set)) 45 #define FD_SET(fd, set) ((set)->bits[_FD_BITSINDEX(fd)] |= _FD_BIT(fd)) 46 #define FD_CLR(fd, set) ((set)->bits[_FD_BITSINDEX(fd)] &= ~_FD_BIT(fd)) 47 #define FD_ISSET(fd, set) ((set)->bits[_FD_BITSINDEX(fd)] & _FD_BIT(fd)) 48 #define FD_COPY(source, target) (*(target) = *(source)) 49 50 #endif /* FD_SET */ 51 52 #ifdef __cplusplus 53 extern "C" { 54 #endif 55 56 extern int pselect(int numBits, struct fd_set *readBits, struct fd_set *writeBits, 57 struct fd_set *errorBits, const struct timespec *timeout, const sigset_t *sigMask); 58 extern int select(int numBits, struct fd_set *readBits, struct fd_set *writeBits, 59 struct fd_set *errorBits, struct timeval *timeout); 60 61 #ifdef __cplusplus 62 } 63 #endif 64 65 #endif /* _SYS_SELECT_H */ 66