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MIB_TCPROW_OWNER_PID structure (tcpmib.h)

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The MIB_TCPROW_OWNER_PID structure contains information that describes an IPv4 TCP connection with IPv4 addresses, ports used by the TCP connection, and the specific process ID (PID) associated with connection.

Syntax

typedef struct _MIB_TCPROW_OWNER_PID {
  DWORD dwState;
  DWORD dwLocalAddr;
  DWORD dwLocalPort;
  DWORD dwRemoteAddr;
  DWORD dwRemotePort;
  DWORD dwOwningPid;
} MIB_TCPROW_OWNER_PID, *PMIB_TCPROW_OWNER_PID;

Members

dwState

Type: DWORD

The state of the TCP connection. This member can be one of the values defined in the Iprtrmib.h header file.

On the Windows SDK released for Windows Vista and later, the organization of header files has changed. This member can be one of the values from the MIB_TCP_STATE enumeration defined in the Tcpmib.h header file, not in the Iprtrmib.h header file. Note that the Tcpmib.h header file is automatically included in Iprtrmib.h, which is automatically included in the Iphlpapi.h header file. The Tcpmib.h and Iprtrmib.h header files should never be used directly.

Value Meaning
MIB_TCP_STATE_CLOSED
1
 The TCP connection is in the CLOSED state that represents no connection state at all.
MIB_TCP_STATE_LISTEN
2
 The TCP connection is in the LISTEN state waiting for a connection request from any remote TCP and port.
MIB_TCP_STATE_SYN_SENT
3
 The TCP connection is in the SYN-SENT state waiting for a matching connection request after having sent a connection request (SYN packet).
MIB_TCP_STATE_SYN_RCVD
4
 The TCP connection is in the SYN-RECEIVED state waiting for a confirming connection request acknowledgment after having both received and sent a connection request (SYN packet).
MIB_TCP_STATE_ESTAB
5
 The TCP connection is in the ESTABLISHED state that represents an open connection, data received can be delivered to the user. This is the normal state for the data transfer phase of the TCP connection.
MIB_TCP_STATE_FIN_WAIT1
6
 The TCP connection is FIN-WAIT-1 state waiting for a connection termination request from the remote TCP, or an acknowledgment of the connection termination request previously sent.
MIB_TCP_STATE_FIN_WAIT2
7
 The TCP connection is FIN-WAIT-2 state waiting for a connection termination request from the remote TCP.
MIB_TCP_STATE_CLOSE_WAIT
8
 The TCP connection is in the CLOSE-WAIT state waiting for a connection termination request from the local user.
MIB_TCP_STATE_CLOSING
9
 The TCP connection is in the CLOSING state waiting for a connection termination request acknowledgment from the remote TCP.
MIB_TCP_STATE_LAST_ACK
10
 The TCP connection is in the LAST-ACK state waiting for an acknowledgment of the connection termination request previously sent to the remote TCP (which includes an acknowledgment of its connection termination request).
MIB_TCP_STATE_TIME_WAIT
11
 The TCP connection is in the TIME-WAIT state waiting for enough time to pass to be sure the remote TCP received the acknowledgment of its connection termination request.
MIB_TCP_STATE_DELETE_TCB
12
 The TCP connection is in the delete TCB state that represents the deletion of the Transmission Control Block (TCB), a data structure used to maintain information on each TCP entry.

dwLocalAddr

Type: DWORD

The local IPv4 address for the TCP connection on the local computer. A value of zero indicates the listener can accept a connection on any interface.

dwLocalPort

Type: DWORD

The local port number in network byte order for the TCP connection on the local computer.

dwRemoteAddr

Type: DWORD

The IPv4 address for the TCP connection on the remote computer. When the dwState member is MIB_TCP_STATE_LISTEN, this value has no meaning.

dwRemotePort

Type: DWORD

The remote port number in network byte order for the TCP connection on the remote computer. When the dwState member is MIB_TCP_STATE_LISTEN, this member has no meaning.

dwOwningPid

Type: DWORD

The PID of the process that issued a context bind for this TCP connection.

Remarks

The MIB_TCPROW_OWNER_PID structure is returned by a call to GetExtendedTcpTable with the TableClass parameter set to TCP_TABLE_OWNER_PID_LISTENER, TCP_TABLE_OWNER_PID_CONNECTIONS, or TCP_TABLE_OWNER_PID_ALL from the TCP_TABLE_CLASS enumeration and the ulAf parameter set to AF_INET4.

The dwState member indicates the state of the TCP entry in a TCP state diagram. A TCP connection progresses through a series of states during its lifetime. The states are: LISTEN, SYN-SENT, SYN-RECEIVED, ESTABLISHED, FIN-WAIT-1, FIN-WAIT-2, CLOSE-WAIT, CLOSING, LAST-ACK, TIME-WAIT, and the fictional state CLOSED. The CLOSED state is fictional because it represents the state when there is no Transmission Control Block, and therefore, no connection. The TCP protocol is described in RFC 793. For more information, see http://www.ietf.org/rfc/rfc793.txt.

The dwLocalPort, and dwRemotePort members are in network byte order. In order to use the dwLocalPort or dwRemotePort members, the ntohs or inet_ntoa functions in Windows Sockets or similar functions may be needed. The dwLocalAddr and dwRemoteAddr members are stored as a DWORD in the same format as the in_addr structure. In order to use the dwLocalAddr or dwRemoteAddr members, the ntohl or inet_ntoa functions in Windows Sockets or similar functions may be needed. On Windows Vista and later, the RtlIpv4AddressToString or RtlIpv4AddressToStringEx functions may be used to convert the IPv4 address in the dwLocalAddr or dwRemoteAddr members to a string without loading the Windows Sockets DLL.

On the Windows SDK released for Windows Vista and later, the organization of header files has changed. This structure is defined in the Tcpmib.h header file, not in the Iprtrmib.h header file. Note that the Tcpmib.h header file is automatically included in Iprtrmib.h, which is automatically included in the Iphlpapi.h header file. The Tcpmib.h and Iprtrmib.h header files should never be used directly.

Requirements

Requirement Value
Minimum supported client Windows Vista, Windows XP with SP2 [desktop apps only]
Minimum supported server Windows Server 2008, Windows Server 2003 with SP1 [desktop apps only]
Header tcpmib.h (include Iphlpapi.h)

See also

GetExtendedTcpTable

RtlIpv4AddressToString

RtlIpv4AddressToStringEx

TCP_TABLE_CLASS

in_addr

inet_ntoa

ntohl

ntohs