io_read_t

Структура, характеризующая сообщения менеджера ресурсов типа _IO_READ

Прототип:

#include <sys/iofunc.h>
        
struct _io_read {
    uint16_t            type;
    uint16_t            combine_len;
    int32_t             nbytes;
    uint32_t            xtype;
    uint32_t            zero;
};
        
typedef union {
    struct _io_read     i;
/*  unsigned char       data[nbytes];   */
/*                      nbytes is returned with MsgReply */
} io_read_t;

Описание:

Данная структура ассоциирована с сообщениями менеджера ресурсов типа _IO_READ. Поле i определяет входящие данные (поступающие в менеджер ресурсов).

The i member is a structure of type _io_read that contains the following members:

type

_IO_READ.

combine_len

If the message is a combine message, _IO_COMBINE_FLAG is set in this member.

nbytes

The number of bytes that the client wants to read.

xtype

Extended type information; one of:

_IO_XTYPE_NONE

_IO_XTYPE_READCOND

_IO_XTYPE_MQUEUE

_IO_XTYPE_TCPIP

_IO_XTYPE_TCPIP_MSG

_IO_XTYPE_OFFSET

_IO_XTYPE_REGISTRY

_IO_XFLAG_DIR_EXTRA_HINT

this flag is valid only when reading from a directory. The filesystem should normally return extra directory information when it's easy to get. If this flag is set, it is a hint to the filesystem to try harder (possibly causing media lookups) to return the extra information. The most common use would be to return _DTYPE_LSTAT information.

_IO_XFLAG_NONBLOCK

_IO_XFLAG_BLOCK

The commented-out declaration for data indicates that nbytes bytes of data immediately follow the io_read_t structure.

Классификация:

ЗОСРВ «Нейтрино»

Тематические ссылки:

resmgr_io_funcs_t, iofunc_read_default(), iofunc_read_verify()

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