1 #pragma once
2 
3 #ifdef __cplusplus
4 extern "C" {
5 #endif
6 
7 #include <features.h>
8 
9 #define __NEED_size_t
10 #define __NEED_time_t
11 #define __NEED_suseconds_t
12 #define __NEED_struct_timeval
13 #define __NEED_struct_timespec
14 #define __NEED_sigset_t
15 
16 #include <bits/alltypes.h>
17 
18 #define FD_SETSIZE 1024
19 
20 typedef unsigned long fd_mask;
21 
22 typedef struct { unsigned long fds_bits[FD_SETSIZE / 8 / sizeof(long)]; } fd_set;
23 
24 #define FD_ZERO(s)                                            \
25     do {                                                      \
26         int __i;                                              \
27         unsigned long* __b = (s)->fds_bits;                   \
28         for (__i = sizeof(fd_set) / sizeof(long); __i; __i--) \
29             *__b++ = 0;                                       \
30     } while (0)
31 #define FD_SET(d, s) \
32     ((s)->fds_bits[(d) / (8 * sizeof(long))] |= (1UL << ((d) % (8 * sizeof(long)))))
33 #define FD_CLR(d, s) \
34     ((s)->fds_bits[(d) / (8 * sizeof(long))] &= ~(1UL << ((d) % (8 * sizeof(long)))))
35 #define FD_ISSET(d, s) \
36     !!((s)->fds_bits[(d) / (8 * sizeof(long))] & (1UL << ((d) % (8 * sizeof(long)))))
37 
38 int select(int, fd_set* __restrict, fd_set* __restrict, fd_set* __restrict,
39            struct timeval* __restrict);
40 int pselect(int, fd_set* __restrict, fd_set* __restrict, fd_set* __restrict,
41             const struct timespec* __restrict, const sigset_t* __restrict);
42 
43 #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
44 #define NFDBITS (8 * (int)sizeof(long))
45 #endif
46 
47 #ifdef __cplusplus
48 }
49 #endif
50