48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
#ifndef _SYS_SELECT_H
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#define _SYS_SELECT_H 1
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#include <sys/time.h>
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#include <minix/types.h>
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#include <minix/limits.h>
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#include <limits.h>
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#include <string.h>
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/* Use this datatype as basic storage unit in fd_set */
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typedef u32_t fd_mask;
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/* This many bits fit in an fd_set word. */
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#define _FDSETBITSPERWORD (sizeof(fd_mask)*8)
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/* Bit manipulation macros */
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#define _FD_BITMASK(b) (1L << ((b) % _FDSETBITSPERWORD))
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#define _FD_BITWORD(b) ((b)/_FDSETBITSPERWORD)
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/* Default FD_SETSIZE is OPEN_MAX. */
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#ifndef FD_SETSIZE
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#define FD_SETSIZE __MINIX_OPEN_MAX
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#endif
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/* We want to store FD_SETSIZE bits. */
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#define _FDSETWORDS(b) (((b)+_FDSETBITSPERWORD-1)/_FDSETBITSPERWORD)
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typedef struct {
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fd_mask fds_bits[_FDSETWORDS(FD_SETSIZE)];
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} fd_set;
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_PROTOTYPE( int select, (int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds, struct timeval *timeout) );
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#define FD_ZERO(s) do { int _i; for(_i = 0; _i < _FDSETWORDS(FD_SETSIZE); _i++) { (s)->fds_bits[_i] = 0; } } while(0)
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#define FD_SET(f, s) do { (s)->fds_bits[_FD_BITWORD(f)] |= _FD_BITMASK(f); } while(0)
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#define FD_CLR(f, s) do { (s)->fds_bits[_FD_BITWORD(f)] &= ~(_FD_BITMASK(f)); } while(0)
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#define FD_ISSET(f, s) ((s)->fds_bits[_FD_BITWORD(f)] & _FD_BITMASK(f))
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/* possible select() operation types; read, write, errors */
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/* (FS/driver internal use only) */
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#define SEL_RD (1 << 0)
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#define SEL_WR (1 << 1)
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#define SEL_ERR (1 << 2)
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#define SEL_NOTIFY (1 << 3) /* not a real select operation */
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#endif /* _SYS_SELECT_H */
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