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47 .TH T_FREE 3NSL "May 7, 1998"
49 t_free \- free a library structure
58 \fBint\fR \fBt_free\fR(\fBvoid *\fR\fIptr\fR, \fBint\fR \fIstruct_type\fR);
64 This routine is part of the \fBXTI\fR interfaces which evolved from the
65 \fBTLI\fR interfaces. \fBXTI\fR represents the future evolution of these
66 interfaces. However, \fBTLI\fR interfaces are supported for compatibility. When
67 using a \fBTLI\fR routine that has the same name as an \fBXTI\fR routine, the
68 \fBtiuser.h\fR header file must be used. Refer to the \fBTLI\fR
69 \fBCOMPATIBILITY\fR section for a description of differences between the two
73 The \fBt_free()\fR function frees memory previously allocated by
74 \fBt_alloc\fR(3NSL). This function will free memory for the specified
75 structure, and will also free memory for buffers referenced by the structure.
78 The argument \fIptr\fR points to one of the seven structure types described for
79 \fBt_alloc\fR(3NSL), and \fIstruct_type\fR identifies the type of that
80 structure which must be one of the following:
86 T_OPTMGMT struct t_optmgmt
88 T_UNITDATA struct t_unitdata
89 T_UDERROR struct t_uderr
96 where each of these structures is used as an argument to one or more transport
100 The function \fBt_free()\fR will check the \fIaddr\fR, \fIopt\fR and
101 \fIudata\fR fields of the given structure, as appropriate, and free the buffers
102 pointed to by the \fIbuf\fR field of the \fBnetbuf\fR structure. If \fIbuf\fR
103 is a null pointer, \fBt_free()\fR will not attempt to free memory. After all
104 buffers are freed, \fBt_free()\fR will free the memory associated with the
105 structure pointed to by \fIptr\fR.
108 Undefined results will occur if \fIptr\fR or any of the \fIbuf\fR pointers
109 points to a block of memory that was not previously allocated by
114 Upon successful completion, a value of \fB0\fR is returned. Otherwise, a
115 value of -1 is returned and \fBt_errno\fR is set to indicate an error.
119 ALL - apart from \fBT_UNINIT\fR.
123 On failure, \fBt_errno\fR is set to the following:
127 \fB\fBTNOSTRUCTYPE\fR\fR
130 Unsupported \fIstruct_type\fR requested.
139 This error indicates that a communication problem has been detected between XTI
140 and the transport provider for which there is no other suitable XTI error
150 A system error has occurred during execution of this function.
153 .SH TLI COMPATIBILITY
156 The \fBXTI\fR and \fBTLI\fR interface definitions have common names but use
157 different header files. This, and other semantic differences between the two
158 interfaces are described in the subsections below.
159 .SS "Interface Header"
162 The \fBXTI\fR interfaces use the header file, \fBxti.h\fR. \fBTLI\fR interfaces
163 should \fInot\fR use this header. They should use the header:
171 .SS "Error Description Values"
174 The \fBt_errno\fR value that can be set by the \fBXTI\fR interface and cannot
175 be set by the \fBTLI\fR interface is:
188 See \fBattributes\fR(5) for descriptions of the following attributes:
196 ATTRIBUTE TYPE ATTRIBUTE VALUE
204 \fBt_alloc\fR(3NSL), \fBattributes\fR(5)