FD_xxx API

 

typedef unsigned int u_int;
typedef u_int    SOCKET;

typedef struct fd_set {
    u_int   fd_count;
    SOCKET  fd_array[FD_SETSIZE];
} fd_set;

#define FD_CLR(fd, set) \
    do                                                                   \
    {                                                                    \
        u_int __i;                                                       \
        for (__i = 0; __i < ((fd_set *)(set))->fd_count; __i++)         \
        {                                                                \
            if (((fd_set *)(set))->fd_array[__i] == (fd))               \
            {                                                            \
                while (__i < ((fd_set *)(set))->fd_count - 1)           \
                {                                                        \
                    ((fd_set*)(set))->fd_array[__i] = ((fd_set*)(set))->fd_array[__i + 1]; \
                    __i++;                                               \
                }                                                        \
                ((fd_set*)(set))->fd_count--;                            \
                break;                                                   \
            }                                                            \
        }                                                                \
    } while (0)

#define FD_SET(fd, set)                                                  \
    do                                                                   \
    {                                                                    \
        u_int __i;                                                       \
        for (__i = 0; __i < ((fd_set *)(set))->fd_count; __i++)         \
        {                                                                \
            if (((fd_set *)(set))->fd_array[__i] == (fd))               \
            {                                                            \
                break;                                                   \
            }                                                            \
        }                                                                \
        if (__i == ((fd_set *)(set))->fd_count)                         \
        {                                                                \
            if (((fd_set *)(set))->fd_count < FD_SETSIZE)               \
            {                                                            \
                ((fd_set *)(set))->fd_array[__i] = (fd);                 \
                ((fd_set *)(set))->fd_count++;                           \
            }                                                            \
        }                                                                \
} while(0)

#define FD_ZERO(set) (((fd_set *)(set))->fd_count = 0)

#define FD_ISSET(fd, set) __WSAFDIsSet((SOCKET)(fd), (fd_set *)(set))