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All Rights Reserved. .\" Portions Copyright (c) 1998, Sun Microsystems, Inc. , All Rights Reserved. .\" .TH T_ALLOC 3NSL "May 7, 1998" .SH NAME t_alloc \- allocate a library structure .SH SYNOPSIS .LP .nf #include \fBvoid *\fR\fBt_alloc\fR(\fBint\fR \fIfd\fR, \fBint\fR \fIstruct_type\fR, \fBint\fR \fIfields\fR); .fi .SH DESCRIPTION .sp .LP This routine is part of the \fBXTI\fR interfaces which evolved from the \fBTLI\fR interfaces. \fBXTI\fR represents the future evolution of these interfaces. However, \fBTLI\fR interfaces are supported for compatibility. When using a \fBTLI\fR routine that has the same name as an \fBXTI\fR routine, a different header file, \fBtiuser.h\fR, must be used. Refer to the section, \fBTLI\fR \fBCOMPATIBILITY\fR, for a description of differences between the two interfaces. .sp .LP The \fBt_alloc()\fR function dynamically allocates memory for the various transport function argument structures as specified below. This function will allocate memory for the specified structure, and will also allocate memory for buffers referenced by the structure. .sp .LP The structure to allocate is specified by \fIstruct_type\fR and must be one of the following: .sp .in +2 .nf T_BIND struct t_bind T_CALL struct t_call T_OPTMGMT struct t_optmgmt T_DIS struct t_discon T_UNITDATA struct t_unitdata T_UDERROR struct t_uderr T_INFO struct t_info .fi .in -2 .sp .LP where each of these structures may subsequently be used as an argument to one or more transport functions. .sp .LP Each of the above structures, except \fBT_INFO,\fR contains at least one field of type \fBstruct\fR \fBnetbuf\fR. For each field of this type, the user may specify that the buffer for that field should be allocated as well. The length of the buffer allocated will be equal to or greater than the appropriate size as returned in the \fIinfo\fR argument of \fBt_open\fR(3NSL) or \fBt_getinfo\fR(3NSL). The relevant fields of the \fIinfo\fR argument are described in the following list. The \fIfields\fR argument specifies which buffers to allocate, where the argument is the bitwise-or of any of the following: .sp .ne 2 .na \fB\fBT_ADDR\fR \fR .ad .RS 12n The \fIaddr\fR field of the \fBt_bind\fR, \fBt_call\fR, \fBt_unitdata\fR or \fBt_uderr\fR structures. .RE .sp .ne 2 .na \fB\fBT_OPT\fR \fR .ad .RS 12n The \fIopt\fR field of the \fBt_optmgmt\fR, \fBt_call\fR, \fBt_unitdata\fR or \fBt_uderr\fR structures. .RE .sp .ne 2 .na \fB\fBT_UDATA\fR \fR .ad .RS 12n The \fIudata\fR field of the \fBt_call\fR, \fBt_discon\fR or \fBt_unitdata\fR structures. .RE .sp .ne 2 .na \fB\fBT_ALL\fR \fR .ad .RS 12n All relevant fields of the given structure. Fields which are not supported by the transport provider specified by \fIfd\fR will not be allocated. .RE .sp .LP For each relevant field specified in \fIfields\fR, \fBt_alloc()\fR will allocate memory for the buffer associated with the field, and initialize the \fIlen\fR field to zero and the \fIbuf\fR pointer and \fImaxlen\fR field accordingly. Irrelevant or unknown values passed in fields are ignored. Since the length of the buffer allocated will be based on the same size information that is returned to the user on a call to \fBt_open\fR(3NSL) and \fBt_getinfo\fR(3NSL), \fIfd\fR must refer to the transport endpoint through which the newly allocated structure will be passed. In the case where a \fBT_INFO\fR structure is to be allocated, \fIfd\fR may be set to any value. In this way the appropriate size information can be accessed. If the size value associated with any specified field is \fBT_INVALID,\fR \fBt_alloc()\fR will be unable to determine the size of the buffer to allocate and will fail, setting \fBt_errno\fR to \fBTSYSERR\fR and \fBerrno\fR to \fBEINVAL\fR. See \fBt_open\fR(3NSL) or \fBt_getinfo\fR(3NSL). If the size value associated with any specified field is \fBT_INFINITE,\fR then the behavior of \fBt_alloc()\fR is implementation-defined. For any field not specified in \fIfields\fR, \fIbuf\fR will be set to the null pointer and \fIlen\fR and \fImaxlen\fR will be set to zero. See \fBt_open\fR(3NSL) or \fBt_getinfo\fR(3NSL). .sp .LP The pointer returned if the allocation succeeds is suitably aligned so that it can be assigned to a pointer to any type of object and then used to access such an object or array of such objects in the space allocated. .sp .LP Use of \fBt_alloc()\fR to allocate structures will help ensure the compatibility of user programs with future releases of the transport interface functions. .SH RETURN VALUES .sp .LP On successful completion, \fBt_alloc()\fR returns a pointer to the newly allocated structure. On failure, a null pointer is returned. .SH VALID STATES .sp .LP ALL - apart from \fBT_UNINIT\fR .SH ERRORS .sp .LP On failure, \fBt_errno\fR is set to one of the following: .sp .ne 2 .na \fB\fBTBADF\fR\fR .ad .RS 16n \fBstruct_type\fR is other than \fBT_INFO\fR and the specified file descriptor does not refer to a transport endpoint. .RE .sp .ne 2 .na \fB\fBTNOSTRUCTYPE\fR\fR .ad .RS 16n Unsupported \fIstruct_type\fR requested. This can include a request for a structure type which is inconsistent with the transport provider type specified, that is, connection-mode or connectionless-mode. .RE .sp .ne 2 .na \fB\fBTPROTO\fR\fR .ad .RS 16n This error indicates that a communication problem has been detected between XTI and the transport provider for which there is no other suitable XTI error \fB(t_errno)\fR. .RE .sp .ne 2 .na \fB\fBTSYSERR\fR\fR .ad .RS 16n A system error has occurred during execution of this function. .RE .SH TLI COMPATIBILITY .sp .LP The \fBXTI\fR and \fBTLI\fR interface definitions have common names but use different header files. This, and other semantic differences between the two interfaces are described in the subsections below. .SS "Interface Header" .sp .LP The \fBXTI\fR interfaces use the header file, \fBxti.h\fR. \fBTLI\fR interfaces should \fInot\fR use this header. They should use the header: .sp .LP \fB#include\fR \fB\fR .SS "Error Description Values" .sp .LP The \fBt_errno\fR values that can be set by the \fBXTI\fR interface and cannot be set by the \fBTLI\fR interface are: .sp .ne 2 .na \fB\fBTPROTO\fR \fR .ad .RS 17n .RE .sp .ne 2 .na \fB\fBTNOSTRUCTYPE\fR \fR .ad .RS 17n .RE .SS "Special Buffer Sizes" .sp .LP Assume that the value associated with any field of \fBstruct\fR \fBt_info\fR (argument returned by \fBt_open()\fR or \fBt_getinfo()\fR\|) that describes buffer limits is -1. Then the underlying service provider can support a buffer of unlimited size. If this is the case, \fBt_alloc()\fR will allocate a buffer with the default size 1024 bytes, which may be handled as described in the next paragraph. .sp .LP If the underlying service provider supports a buffer of unlimited size in the \fBnetbuf\fR structure (see \fBt_connect\fR(3NSL)), \fBt_alloc()\fR will return a buffer of size 1024 bytes. If a larger size buffer is required, it will need to be allocated separately using a memory allocation routine such as \fBmalloc\fR(3C). The \fBbuf\fR and \fBmaxlen\fR fields of the \fBnetbuf\fR data structure can then be updated with the address of the new buffer and the 1024 byte buffer originally allocated by \fBt_alloc()\fR can be freed using \fBfree\fR(3C). .sp .LP Assume that the value associated with any field of \fBstruct\fR \fBt_info\fR (argument returned by \fBt_open()\fR or \fBt_getinfo()\fR \fB\|)\fR that describes nbuffer limits is \fB-2\fR\&. Then \fBt_alloc()\fR will set the buffer pointer to \fINULL\fR and the buffer maximum size to \fB0\fR, and then will return success (see \fBt_open\fR(3NSL) or \fBt_getinfo\fR(3NSL)). .SH ATTRIBUTES .sp .LP See \fBattributes\fR(7) for descriptions of the following attributes: .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ MT Level Safe .TE .SH SEE ALSO .sp .LP .BR free (3C), .BR malloc (3C), .BR t_connect (3NSL), .BR t_free (3NSL), .BR t_getinfo (3NSL), .BR t_open (3NSL), .BR attributes (7)