66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
#ifndef DFS_SELECT_H__
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#define DFS_SELECT_H__
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#ifdef RT_USING_LWIP
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/* we use lwIP's structure definitions. */
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#include <lwip/sockets.h>
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#elif defined(RT_USING_POSIX)
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#ifndef FD_SET
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/* Get the total number of descriptors that we will have to support */
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#define FD_SETSIZE (12)
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/* We will use a 32-bit bitsets to represent the set of descriptors. How
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* many uint32_t's do we need to span all descriptors?
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*/
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#if FD_SETSIZE <= 32
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# define __SELECT_NUINT32 1
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#elif FD_SETSIZE <= 64
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# define __SELECT_NUINT32 2
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#elif FD_SETSIZE <= 96
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# define __SELECT_NUINT32 3
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#elif FD_SETSIZE <= 128
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# define __SELECT_NUINT32 4
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#elif FD_SETSIZE <= 160
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# define __SELECT_NUINT32 5
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#elif FD_SETSIZE <= 192
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# define __SELECT_NUINT32 6
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#elif FD_SETSIZE <= 224
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# define __SELECT_NUINT32 7
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#elif FD_SETSIZE <= 256
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# define __SELECT_NUINT32 8
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#else
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# warning "Larger fd_set needed"
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#endif
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/* These macros map a file descriptor to an index and bit number */
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#define _FD_NDX(fd) ((fd) >> 5)
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#define _FD_BIT(fd) ((fd) & 0x1f)
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/* Standard helper macros */
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#define FD_CLR(fd,set) \
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((((fd_set*)(set))->arr)[_FD_NDX(fd)] &= ~(1 << _FD_BIT(fd)))
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#define FD_SET(fd,set) \
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((((fd_set*)(set))->arr)[_FD_NDX(fd)] |= (1 << _FD_BIT(fd)))
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#define FD_ISSET(fd,set) \
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(((((fd_set*)(set))->arr)[_FD_NDX(fd)] & (1 << _FD_BIT(fd))) != 0)
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#define FD_ZERO(set) \
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memset((set), 0, sizeof(fd_set))
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typedef struct
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{
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uint32_t arr[__SELECT_NUINT32];
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}fd_set;
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#endif
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int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);
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#endif /* end of RT_USING_LWIP */
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#endif
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