source: trunk/minix/include/sys/select.h@ 10

Last change on this file since 10 was 9, checked in by Mattia Monga, 13 years ago

Minix 3.1.2a

File size: 1.5 KB
Line 
1#ifndef _SYS_SELECT_H
2#define _SYS_SELECT_H 1
3
4#ifndef _POSIX_SOURCE
5#define _POSIX_SOURCE 1
6#endif
7
8#include <sys/time.h>
9#include <sys/types.h>
10#include <limits.h>
11#include <string.h>
12
13/* Use this datatype as basic storage unit in fd_set */
14typedef u32_t fd_mask;
15
16/* This many bits fit in an fd_set word. */
17#define _FDSETBITSPERWORD (sizeof(fd_mask)*8)
18
19/* Bit manipulation macros */
20#define _FD_BITMASK(b) (1L << ((b) % _FDSETBITSPERWORD))
21#define _FD_BITWORD(b) ((b)/_FDSETBITSPERWORD)
22
23/* Default FD_SETSIZE is OPEN_MAX. */
24#ifndef FD_SETSIZE
25#define FD_SETSIZE OPEN_MAX
26#endif
27
28/* We want to store FD_SETSIZE bits. */
29#define _FDSETWORDS ((FD_SETSIZE+_FDSETBITSPERWORD-1)/_FDSETBITSPERWORD)
30
31typedef struct {
32 fd_mask fds_bits[_FDSETWORDS];
33} fd_set;
34
35_PROTOTYPE( int select, (int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds, struct timeval *timeout) );
36
37#define FD_ZERO(s) do { int _i; for(_i = 0; _i < _FDSETWORDS; _i++) { (s)->fds_bits[_i] = 0; } } while(0)
38#define FD_SET(f, s) do { (s)->fds_bits[_FD_BITWORD(f)] |= _FD_BITMASK(f); } while(0)
39#define FD_CLR(f, s) do { (s)->fds_bits[_FD_BITWORD(f)] &= ~(_FD_BITMASK(f)); } while(0)
40#define FD_ISSET(f, s) ((s)->fds_bits[_FD_BITWORD(f)] & _FD_BITMASK(f))
41
42/* possible select() operation types; read, write, errors */
43/* (FS/driver internal use only) */
44#define SEL_RD (1 << 0)
45#define SEL_WR (1 << 1)
46#define SEL_ERR (1 << 2)
47#define SEL_NOTIFY (1 << 3) /* not a real select operation */
48
49#endif /* _SYS_SELECT_H */
50
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