1 //===-- Macros defined in sys/select.h header file ------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef LLVM_LIBC_MACROS_SYS_SELECT_MACROS_H 10 #define LLVM_LIBC_MACROS_SYS_SELECT_MACROS_H 11 12 #define FD_SETSIZE 1024 13 #define __FD_SET_WORD_TYPE unsigned long 14 #define __FD_SET_WORD_SIZE (sizeof(__FD_SET_WORD_TYPE) * 8) 15 #define __FD_SET_ARRAYSIZE (FD_SETSIZE / __FD_SET_WORD_SIZE) 16 17 #define FD_ZERO(set) \ 18 do { \ 19 unsigned i; \ 20 for (i = 0; i < __FD_SET_ARRAYSIZE; ++i) \ 21 (set)->__set[i] = 0; \ 22 } while (0) 23 24 #define __FD_WORD(fd) ((fd) / __FD_SET_WORD_SIZE) 25 #define __FD_MASK(fd) \ 26 ((__FD_SET_WORD_TYPE)1) << ((__FD_SET_WORD_TYPE)((fd) % __FD_SET_WORD_SIZE)) 27 28 #define FD_CLR(fd, set) (void)((set)->__set[__FD_WORD(fd)] &= ~__FD_MASK(fd)) 29 30 #define FD_SET(fd, set) (void)((set)->__set[__FD_WORD(fd)] |= __FD_MASK(fd)) 31 32 #define FD_ISSET(fd, set) \ 33 (int)(((set)->__set[__FD_WORD(fd)] & __FD_MASK(fd)) != 0) 34 35 #endif // LLVM_LIBC_MACROS_SYS_SELECT_MACROS_H 36