1 /* 2 * Copyright (c) 2006-2022, RT-Thread Development Team 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 * 6 * Change Logs: 7 * Date Author Notes 8 * 2021-07-21 Meco Man The first version 9 * 2021-12-25 Meco Man Handle newlib 2.2.0 or lower version 10 */ 11 12 #ifndef __SYS_SELECT_H__ 13 #define __SYS_SELECT_H__ 14 15 #include <rtconfig.h> 16 #include <sys/types.h> 17 #include <sys/time.h> 18 #include <string.h> 19 20 #ifdef __cplusplus 21 extern "C" { 22 #endif 23 24 #ifndef FD_SETSIZE 25 #define FD_SETSIZE 32 26 #endif 27 28 #ifdef SAL_USING_POSIX 29 #ifdef FD_SETSIZE 30 #undef FD_SETSIZE 31 #endif 32 #define FD_SETSIZE DFS_FD_MAX 33 #endif /* SAL_USING_POSIX */ 34 35 typedef long fd_mask; 36 37 #ifndef _SYS_TYPES_FD_SET /* Newlib 2.2.0 or lower version */ 38 #define NBBY 8 /* number of bits in a byte */ 39 #define NFDBITS (sizeof (fd_mask) * NBBY) /* bits per mask */ 40 #ifndef howmany 41 #define howmany(x,y) (((x)+((y)-1))/(y)) 42 #endif /* howmany */ 43 44 typedef struct _types_fd_set { 45 fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)]; 46 } _types_fd_set; 47 #define fd_set _types_fd_set 48 49 #define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1L << ((n) % NFDBITS))) 50 #define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1L << ((n) % NFDBITS))) 51 #define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1L << ((n) % NFDBITS))) 52 #define FD_ZERO(p) memset((void*)(p), 0, sizeof(*(p))) 53 #endif /* _SYS_TYPES_FD_SET */ 54 55 int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout); 56 57 #ifdef __cplusplus 58 } 59 #endif 60 61 #endif /* __SYS_SELECT_H__ */ 62