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Manual Pages for UNIX Operating System command usage for man t_open

Networking Services Library Functions t_open(3NSL)

NAME

t_open - establish a transport endpoint

SYNOPSIS

#include

int t_open(const char name, int oflag, struct t_info info);

DESCRIPTION

This routine is part of the XTI interfaces which evolved from the TLI interfaces. XTI represents the future evolution of these interfaces. However, TLI interfaces are supported for compatibility. When using a TLI routine that has the same name as an XTI routine, the tiuser.h header file must be used. Refer to the TLI COMPATIBILITY section for a description of differences between the two interfaces.

The t_open() function must be called as the first step in

the initialization of a transport endpoint. This function establishes a transport endpoint by supplying a transport provider identifier that indicates a particular transport provider, that is, transport protocol, and returning a file descriptor that identifies that endpoint. The argument name points to a transport provider identifier and oflag identifies any open flags, as in open(2). The

argument oflag is constructed from O_RDWR optionally bit-

wise inclusive-OR'ed with O_NONBLOCK. These flags are

defined by the header . The file descriptor

returned by t_open() will be used by all subsequent func-

tions to identify the particular local transport endpoint. This function also returns various default characteristics of the underlying transport protocol by setting fields in

the t_info structure. This argument points to a t_info which

contains the following members:

t_scalar_t addr; /* max size of the transport protocol address */

t_scalar_t options; /* max number of bytes of */

/* protocol-specific options */

t_scalar_t tsdu; /* max size of a transport service data */

/* unit (TSDU) */

t_scalar_t etsdu; /* max size of an expedited transport */

/* service data unit (ETSDU) */

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Networking Services Library Functions t_open(3NSL)

t_scalar_t connect; /* max amount of data allowed on */

/* connection establishment functions */

t_scalar_t discon; /* max amount of data allowed on */

/* t_snddis() and t_rcvdis() functions */

t_scalar_t servtype; /* service type supported by the */

/* transport provider */

t_scalar_t flags; /* other info about the transport provider */

The values of the fields have the following meanings:

addr A value greater than zero (T_NULL) indicates the

maximum size of a transport protocol address and

a value of -2 (T_INVALID) specifies that the

transport provider does not provide user access to transport protocol addresses.

options A value greater than zero (T_NULL) indicates the

maximum number of bytes of protocol-specific

options supported by the provider, and a value

of -2 (T_INVALID) specifies that the transport

provider does not support user-settable options.

tsdu A value greater than zero (T_NULL specifies the

maximum size of a transport service data unit

(TSDU); a value of zero (T_NULL) specifies that

the transport provider does not support the con-

cept of TSDU, although it does support the send-

ing of a data stream with no logical boundaries

preserved across a connection; a value of -1

(T_INFINITE) specifies that there is no limit to

the size of a TSDU; and a value of -2

(T_INVALID) specifies that the transfer of nor-

mal data is not supported by the transport pro-

vider.

etsdu A value greater than zero (T_NULL) specifies the

maximum size of an expedited transport service

data unit (ETSDU); a value of zero (T_NULL)

specifies that the transport provider does not support the concept of ETSDU, although it does support the sending of an expedited data stream with no logical boundaries preserved across a

connection; a value of -1 (T_INFINITE) speci-

fies that there is no limit on the size of an

ETSDU; and a value of -2 (T_INVALID) specifies

that the transfer of expedited data is not sup-

ported by the transport provider. Note that the

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Networking Services Library Functions t_open(3NSL)

semantics of expedited data may be quite dif-

ferent for different transport providers.

connect A value greater than zero (T_NULL) specifies the

maximum amount of data that may be associated with connection establishment functions, and a

value of -2 (T_INVALID) specifies that the tran-

sport provider does not allow data to be sent with connection establishment functions.

discon If the T_ORDRELDATA bit in flags is clear, a

value greater than zero (T_NULL) specifies the

maximum amount of data that may be associated

with the t_snddis(3NSL) and t_rcvdis(3NSL) func-

tions, and a value of -2 (T_INVALID) specifies

that the transport provider does not allow data to be sent with the abortive release functions.

If the T_ORDRELDATA bit is set in flags, a

value greater than zero (T_NULL) specifies the

maximum number of octets that may be associated

with the t_sndreldata(), t_rcvreldata(),

t_snddis(3NSL) and t_rcvdis(3NSL) functions.

servtype This field specifies the service type supported by the transport provider, as described below.

flags This is a bit field used to specify other infor-

mation about the communications provider. If

the T_ORDRELDATA bit is set, the communications

provider supports user data to be sent with an

orderly release. If the T_SENDZERO bit is set

in flags, this indicates the underlying tran-

sport provider supports the sending of zero-

length TSDUs. If a transport user is concerned with protocol independence, the above sizes may be accessed to determine how large the

buffers must be to hold each piece of information. Alterna-

tively, the t_alloc(3NSL) function may be used to allocate

these buffers. An error will result if a transport user exceeds the allowed data size on any function. The servtype field of info specifies one of the following values on return:

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Networking Services Library Functions t_open(3NSL)

T_COTS The transport provider supports a

connection-mode service but does not support

the optional orderly release facility.

T_COTS_ORD The transport provider supports a

connection-mode service with the optional

orderly release facility.

T_CLTS The transport provider supports a

connectionless-mode service. For this service

type, t_open() will return -2 (T_INVALID) for

etsdu, connect and discon. A single transport endpoint may support only one of the above services at one time. If info is set to a null pointer by the transport user, no

protocol information is returned by t_open().

RETURN VALUES

A valid file descriptor is returned upon successful comple-

tion. Otherwise, a value of -1 is returned and t_errno is

set to indicate an error. VALID STATES

T_UNINIT.

ERRORS

On failure, t_errno is set to the following:

TBADFLAG An invalid flag is specified.

TBADNAME Invalid transport provider name.

TPROTO This error indicates that a communication prob-

lem has been detected between XTI and the tran-

sport provider for which there is no other suit-

able XTI error (t_errno).

TSYSERR A system error has occurred during execution of this function.

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Networking Services Library Functions t_open(3NSL)

TLI COMPATIBILITY The XTI and TLI interface definitions have common names but

use different header files. This and other semantic differ-

ences between the two interfaces are described in the sub-

sections below. Interface Header The XTI interfaces use the xti.h TLI interfaces should not use this header. They should use the header:

#include

Error Description Values

The t_errno values TPROTO and TBADNAME can be set by the XTI

interface but cannot be set by the TLI interface. Notes

For TLI , the t_info structure referenced by info lacks the

following structure member:

t_scalar_t flags; /* other info about the transport provider */

This member was added to struct t_info in the XTI inter-

faces.

When a value of -1 is observed as the return value in vari-

ous t_info structure members, it signifies that the tran-

sport provider can handle an infinite length buffer for a corresponding attribute, such as address data, option data, TSDU (octet size), ETSDU (octet size), connection data, and disconnection data. The corresponding structure members are

addr, options, tsdu, estdu, connect, and discon, respec-

tively.

ATTRIBUTES

See attributes(5) for descriptions of the following attri-

butes:

____________________________________________________________

| ATTRIBUTE TYPE | ATTRIBUTE VALUE |

|_____________________________|_____________________________|

| MT Level | Safe |

|_____________________________|_____________________________|

Manual Pages for UNIX Operating System command usage for man t_open

Networking Services Library Functions t_open(3NSL)

NAME

t_open - establish a transport endpoint

SYNOPSIS

int t_open(const char *name, int oflag, struct t_info *info);

DESCRIPTION

The t_open() function must be called as the first step in

returned by t_open() will be used by all subsequent func-

Networking Services Library Functions t_open(3NSL)

Networking Services Library Functions t_open(3NSL)

Networking Services Library Functions t_open(3NSL)

type, t_open() will return -2 (T_INVALID) for

protocol information is returned by t_open().

RETURN VALUES

ERRORS

TBADNAME Invalid transport provider name.

Networking Services Library Functions t_open(3NSL)

The t_errno values TPROTO and TBADNAME can be set by the XTI

ATTRIBUTES

| ATTRIBUTE TYPE | ATTRIBUTE VALUE |

SEE ALSO

int t_open(const char name, int oflag, struct t_info info);