xref: /aosp_15_r20/external/llvm-libc/include/llvm-libc-macros/sys-select-macros.h (revision 71db0c75aadcf003ffe3238005f61d7618a3fead)
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