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Extend the fd_set type definition so that it can handle more than 32 descriptors (if so configured). From Max Neklyudov

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Gregory Nutt 2015-02-25 08:05:42 -06:00
parent 4435103316
commit 10852dcc25
1 changed files with 26 additions and 17 deletions
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43
include/sys/select.h
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@ -1,7 +1,7 @@
/****************************************************************************
* include/sys/select.h
*
* Copyright (C) 2008-2009, 2011 Gregory Nutt. All rights reserved.
* Copyright (C) 2008-2009, 2011, 2015 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@ -53,49 +53,58 @@
/* Get the total number of descriptors that we will have to support */
#define __SELECT_NDESCRIPTORS (CONFIG_NFILE_DESCRIPTORS + CONFIG_NSOCKET_DESCRIPTORS)
#define FD_SETSIZE (CONFIG_NFILE_DESCRIPTORS + CONFIG_NSOCKET_DESCRIPTORS)
/* We will use a 32-bit bitsets to represent the set of descriptors. How
* many uint32_t's do we need to span all descriptors?
*/
#if __SELECT_NDESCRIPTORS <= 32
#if FD_SETSIZE <= 32
# define __SELECT_NUINT32 1
#elif __SELECT_NDESCRIPTORS <= 64
#elif FD_SETSIZE <= 64
# define __SELECT_NUINT32 2
#elif __SELECT_NDESCRIPTORS <= 96
#elif FD_SETSIZE <= 96
# define __SELECT_NUINT32 3
#elif __SELECT_NDESCRIPTORS <= 128
#elif FD_SETSIZE <= 128
# define __SELECT_NUINT32 4
#elif __SELECT_NDESCRIPTORS <= 160
#elif FD_SETSIZE <= 160
# define __SELECT_NUINT32 5
#elif __SELECT_NDESCRIPTORS <= 192
#elif FD_SETSIZE <= 192
# define __SELECT_NUINT32 6
#elif __SELECT_NDESCRIPTORS <= 224
#elif FD_SETSIZE <= 224
# define __SELECT_NUINT32 7
#elif __SELECT_NDESCRIPTORS <= 256
#elif FD_SETSIZE <= 256
# define __SELECT_NUINT32 8
#else
# warning "Large fd_set needed"
# warning "Larger fd_set needed"
#endif
/* These macros map a file descripto to an index and bit number */
/* These macros map a file descriptor to an index and bit number */
#define _FD_NDX(fd) ((fd) >> 5)
#define _FD_BIT(fd) ((fd) & 0x1f)
/* Standard helper macros */
#define FD_CLR(fd,set) (((uint32_t*)(set))[_FD_NDX(fd)] &= ~(1 << _FD_BIT(fd)))
#define FD_SET(fd,set) (((uint32_t*)(set))[_FD_NDX(fd)] |= (1 << _FD_BIT(fd)))
#define FD_ISSET(fd,set) ((((uint32_t*)(set))[_FD_NDX(fd)] & (1 << _FD_BIT(fd))) != 0)
#define FD_ZERO(set) memset(set, 0, sizeof(fd_set))
#define FD_CLR(fd,set) \
((((fd_set*)(set))->arr)[_FD_NDX(fd)] &= ~(1 << _FD_BIT(fd)))
#define FD_SET(fd,set) \
((((fd_set*)(set))->arr)[_FD_NDX(fd)] |= (1 << _FD_BIT(fd)))
#define FD_ISSET(fd,set) \
(((((fd_set*)(set))->arr)[_FD_NDX(fd)] & (1 << _FD_BIT(fd))) != 0)
#define FD_ZERO(set) \
memset((set), 0, sizeof(fd_set))
/****************************************************************************
* Type Definitions
****************************************************************************/
typedef uint32_t fd_set[__SELECT_NUINT32];
struct fd_set_s
{
uint32_t arr[__SELECT_NUINT32];
};
typedef struct fd_set_s fd_set;
/****************************************************************************
* Public Function Prototypes