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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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include/sys/select.h
+26 -17
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@@ -1,7 +1,7 @@
/**************************************************************************** /****************************************************************************
* include/sys/select.h * 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> * Author: Gregory Nutt <gnutt@nuttx.org>
* *
* Redistribution and use in source and binary forms, with or without * 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 */ /* 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 /* 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? * many uint32_t's do we need to span all descriptors?
*/ */
#if __SELECT_NDESCRIPTORS <= 32 #if FD_SETSIZE <= 32
# define __SELECT_NUINT32 1 # define __SELECT_NUINT32 1
#elif __SELECT_NDESCRIPTORS <= 64 #elif FD_SETSIZE <= 64
# define __SELECT_NUINT32 2 # define __SELECT_NUINT32 2
#elif __SELECT_NDESCRIPTORS <= 96 #elif FD_SETSIZE <= 96
# define __SELECT_NUINT32 3 # define __SELECT_NUINT32 3
#elif __SELECT_NDESCRIPTORS <= 128 #elif FD_SETSIZE <= 128
# define __SELECT_NUINT32 4 # define __SELECT_NUINT32 4
#elif __SELECT_NDESCRIPTORS <= 160 #elif FD_SETSIZE <= 160
# define __SELECT_NUINT32 5 # define __SELECT_NUINT32 5
#elif __SELECT_NDESCRIPTORS <= 192 #elif FD_SETSIZE <= 192
# define __SELECT_NUINT32 6 # define __SELECT_NUINT32 6
#elif __SELECT_NDESCRIPTORS <= 224 #elif FD_SETSIZE <= 224
# define __SELECT_NUINT32 7 # define __SELECT_NUINT32 7
#elif __SELECT_NDESCRIPTORS <= 256 #elif FD_SETSIZE <= 256
# define __SELECT_NUINT32 8 # define __SELECT_NUINT32 8
#else #else
# warning "Large fd_set needed" # warning "Larger fd_set needed"
#endif #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_NDX(fd) ((fd) >> 5)
#define _FD_BIT(fd) ((fd) & 0x1f) #define _FD_BIT(fd) ((fd) & 0x1f)
/* Standard helper macros */ /* Standard helper macros */
#define FD_CLR(fd,set) (((uint32_t*)(set))[_FD_NDX(fd)] &= ~(1 << _FD_BIT(fd))) #define FD_CLR(fd,set) \
#define FD_SET(fd,set) (((uint32_t*)(set))[_FD_NDX(fd)] |= (1 << _FD_BIT(fd))) ((((fd_set*)(set))->arr)[_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_SET(fd,set) \
#define FD_ZERO(set) memset(set, 0, sizeof(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 * 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 * Public Function Prototypes