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emscripten-core
GitHub Repository: emscripten-core/emscripten
 Path: blob/main/system/lib/llvm-libc/include/llvm-libc-macros/sys-select-macros.h
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//===-- Macros defined in sys/select.h header file ------------------------===//

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//

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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

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// See https://llvm.org/LICENSE.txt for license information.

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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

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//

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//===----------------------------------------------------------------------===//

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#ifndef LLVM_LIBC_MACROS_SYS_SELECT_MACROS_H

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#define LLVM_LIBC_MACROS_SYS_SELECT_MACROS_H

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#define FD_SETSIZE 1024

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#define __FD_SET_WORD_TYPE unsigned long

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#define __FD_SET_WORD_SIZE (sizeof(__FD_SET_WORD_TYPE) * 8)

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#define __FD_SET_ARRAYSIZE (FD_SETSIZE / __FD_SET_WORD_SIZE)

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#define FD_ZERO(set)                                                           \

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  do {                                                                         \

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    unsigned i;                                                                \

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    for (i = 0; i < __FD_SET_ARRAYSIZE; ++i)                                   \

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      (set)->__set[i] = 0;                                                     \

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  } while (0)

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#define __FD_WORD(fd) ((fd) / __FD_SET_WORD_SIZE)

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#define __FD_MASK(fd)                                                          \

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  ((__FD_SET_WORD_TYPE)1) << ((__FD_SET_WORD_TYPE)((fd) % __FD_SET_WORD_SIZE))

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#define FD_CLR(fd, set) (void)((set)->__set[__FD_WORD(fd)] &= ~__FD_MASK(fd))

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#define FD_SET(fd, set) (void)((set)->__set[__FD_WORD(fd)] |= __FD_MASK(fd))

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#define FD_ISSET(fd, set)                                                      \

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  (int)(((set)->__set[__FD_WORD(fd)] & __FD_MASK(fd)) != 0)

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#endif // LLVM_LIBC_MACROS_SYS_SELECT_MACROS_H

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