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| 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 |
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