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package goselect
/**
From: XCode's MacOSX10.10.sdk/System/Library/Frameworks/Kernel.framework/Versions/A/Headers/sys/select.h
--
// darwin/amd64 / 386
sizeof(__int32_t) == 4
--
typedef __int32_t __fd_mask;
#define FD_SETSIZE 1024
#define __NFDBITS (sizeof(__fd_mask) * 8)
#define __howmany(x, y) ((((x) % (y)) == 0) ? ((x) / (y)) : (((x) / (y)) + 1))
typedef struct fd_set {
__fd_mask fds_bits[__howmany(__FD_SETSIZE, __NFDBITS)];
} fd_set;
#define __FD_MASK(n) ((__fd_mask)1 << ((n) % __NFDBITS))
#define FD_SET(n, p) ((p)->fds_bits[(n)/__NFDBITS] |= __FD_MASK(n))
#define FD_CLR(n, p) ((p)->fds_bits[(n)/__NFDBITS] &= ~__FD_MASK(n))
#define FD_ISSET(n, p) (((p)->fds_bits[(n)/__NFDBITS] & __FD_MASK(n)) != 0)
*/
/**
From: /usr/include/i386-linux-gnu/sys/select.h
--
// linux/i686
sizeof(long int) == 4
--
typedef long int __fd_mask;
#define FD_SETSIZE 1024
#define __NFDBITS (sizeof(__fd_mask) * 8)
typedef struct fd_set {
__fd_mask fds_bits[__FD_SETSIZE / __NFDBITS];
} fd_set;
#define __FD_MASK(n) ((__fd_mask)1 << ((n) % __NFDBITS))
#define FD_SET(n, p) ((p)->fds_bits[(n)/__NFDBITS] |= __FD_MASK(n))
#define FD_CLR(n, p) ((p)->fds_bits[(n)/__NFDBITS] &= ~__FD_MASK(n))
#define FD_ISSET(n, p) (((p)->fds_bits[(n)/__NFDBITS] & __FD_MASK(n)) != 0)
*/
/**
From: /usr/include/x86_64-linux-gnu/sys/select.h
--
// linux/amd64
sizeof(long int) == 8
--
typedef long int __fd_mask;
#define FD_SETSIZE 1024
#define __NFDBITS (sizeof(__fd_mask) * 8)
typedef struct fd_set {
__fd_mask fds_bits[__FD_SETSIZE / __NFDBITS];
} fd_set;
#define __FD_MASK(n) ((__fd_mask)1 << ((n) % __NFDBITS))
#define FD_SET(n, p) ((p)->fds_bits[(n)/__NFDBITS] |= __FD_MASK(n))
#define FD_CLR(n, p) ((p)->fds_bits[(n)/__NFDBITS] &= ~__FD_MASK(n))
#define FD_ISSET(n, p) (((p)->fds_bits[(n)/__NFDBITS] & __FD_MASK(n)) != 0)
*/
/**
From: /usr/include/sys/select.h
--
// freebsd/amd64
sizeof(unsigned long) == 8
--
typedef unsigned long __fd_mask;
#define FD_SETSIZE 1024U
#define __NFDBITS (sizeof(__fd_mask) * 8)
#define _howmany(x, y) (((x) + ((y) - 1)) / (y))
typedef struct fd_set {
__fd_mask fds_bits[_howmany(FD_SETSIZE, __NFDBITS)];
} fd_set;
#define __FD_MASK(n) ((__fd_mask)1 << ((n) % __NFDBITS))
#define FD_SET(n, p) ((p)->fds_bits[(n)/__NFDBITS] |= __FD_MASK(n))
#define FD_CLR(n, p) ((p)->fds_bits[(n)/__NFDBITS] &= ~__FD_MASK(n))
#define FD_ISSET(n, p) (((p)->fds_bits[(n)/__NFDBITS] & __FD_MASK(n)) != 0)
*/
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