原因
除了前面描述的所有信息元素(可在调用 WSAConnect 时在 ATM 特定的 QoS 结构中指定)之外,还有一个只能在调用发布期间使用的 Cause IE。 断开连接后,Windows 套接字 2 应用程序可以选择将此 IE 指定为 WSASendDisconnect 中的断开连接数据。 远程方可以在收到FD_CLOSE通知后通过 WSARecvDisconnect 检索此 IE。
#include <windows.h>
/*
* values used for the Location field in struct ATM_CAUSE_IE
*/
#define CAUSE_LOC_USER 0x00
#define CAUSE_LOC_PRIVATE_LOCAL 0x01
#define CAUSE_LOC_PUBLIC_LOCAL 0x02
#define CAUSE_LOC_TRANSIT_NETWORK 0x03
#define CAUSE_LOC_PUBLIC_REMOTE 0x04
#define CAUSE_LOC_PRIVATE_REMOTE 0x05
#define CAUSE_LOC_INTERNATIONAL_NETWORK 0x06
#define CAUSE_LOC_BEYOND_INTERWORKING 0x0A
/*
* values used for the Cause field in struct ATM_CAUSE_IE
*/
#define CAUSE_UNALLOCATED_NUMBER 0x01
#define CAUSE_NO_ROUTE_TO_TRANSIT_NETWORK 0x02
#define CAUSE_NO_ROUTE_TO_DESTINATION 0x03
#define CAUSE_VPI_VCI_UNACCEPTABLE 0x0A
#define CAUSE_NORMAL_CALL_CLEARING 0x10
#define CAUSE_USER_BUSY 0x11
#define CAUSE_NO_USER_RESPONDING 0x12
#define CAUSE_CALL_REJECTED 0x15
#define CAUSE_NUMBER_CHANGED 0x16
#define CAUSE_USER_REJECTS_CLIR 0x17
#define CAUSE_DESTINATION_OUT_OF_ORDER 0x1B
#define CAUSE_INVALID_NUMBER_FORMAT 0x1C
#define CAUSE_STATUS_ENQUIRY_RESPONSE 0x1E
#define CAUSE_NORMAL_UNSPECIFIED 0x1F
#define CAUSE_VPI_VCI_UNAVAILABLE 0x23
#define CAUSE_NETWORK_OUT_OF_ORDER 0x26
#define CAUSE_TEMPORARY_FAILURE 0x29
#define CAUSE_ACCESS_INFORMAION_DISCARDED 0x2B
#define CAUSE_NO_VPI_VCI_AVAILABLE 0x2D
#define CAUSE_RESOURCE_UNAVAILABLE 0x2F
#define CAUSE_QOS_UNAVAILABLE 0x31
#define CAUSE_USER_CELL_RATE_UNAVAILABLE 0x33
#define CAUSE_BEARER_CAPABILITY_UNAUTHORIZED 0x39
#define CAUSE_BEARER_CAPABILITY_UNAVAILABLE 0x3A
#define CAUSE_OPTION_UNAVAILABLE 0x3F
#define CAUSE_BEARER_CAPABILITY_UNIMPLEMENTED 0x41
#define CAUSE_UNSUPPORTED_TRAFFIC_PARAMETERS 0x49
#define CAUSE_INVALID_CALL_REFERENCE 0x51
#define CAUSE_CHANNEL_NONEXISTENT 0x52
#define CAUSE_INCOMPATIBLE_DESTINATION 0x58
#define CAUSE_INVALID_ENDPOINT_REFERENCE 0x59
#define CAUSE_INVALID_TRANSIT_NETWORK_SELECTION 0x5B
#define CAUSE_TOO_MANY_PENDING_ADD_PARTY 0x5C
#define CAUSE_AAL_PARAMETERS_UNSUPPORTED 0x5D
#define CAUSE_MANDATORY_IE_MISSING 0x60
#define CAUSE_UNIMPLEMENTED_MESSAGE_TYPE 0x61
#define CAUSE_UNIMPLEMENTED_IE 0x63
#define CAUSE_INVALID_IE_CONTENTS 0x64
#define CAUSE_INVALID_STATE_FOR_MESSAGE 0x65
#define CAUSE_RECOVERY_ON_TIMEOUT 0x66
#define CAUSE_INCORRECT_MESSAGE_LENGTH 0x68
#define CAUSE_PROTOCOL_ERROR 0x6F
/*
* values used for the Condition portion of the Diagnostics field
* in struct ATM_CAUSE_IE, for certain Cause values
*/
#define CAUSE_COND_UNKNOWN 0x00
#define CAUSE_COND_PERMANENT 0x01
#define CAUSE_COND_TRANSIENT 0x02
/*
* values used for the Rejection Reason portion of the Diagnostics field
* in struct ATM_CAUSE_IE, for certain Cause values
*/
#define CAUSE_REASON_USER 0x00
#define CAUSE_REASON_IE_MISSING 0x04
#define CAUSE_REASON_IE_INSUFFICIENT 0x08
/*
* values used for the P-U flag of the Diagnostics field
* in struct ATM_CAUSE_IE, for certain Cause values
*/
#define CAUSE_PU_PROVIDER 0x00
#define CAUSE_PU_USER 0x08
/*
* values used for the N-A flag of the Diagnostics field
* in struct ATM_CAUSE_IE, for certain Cause values
*/
#define CAUSE_NA_NORMAL 0x00
#define CAUSE_NA_ABNORMAL 0x04
typedef struct {
UCHAR Location;
UCHAR Cause;
UCHAR DiagnosticsLength;
UCHAR Diagnostics[4];
} ATM_CAUSE_IE;