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10 .TH T_FREE 3NSL "May 7, 1998"
12 t_free \- free a library structure
21 \fBint\fR \fBt_free\fR(\fBvoid *\fR\fIptr\fR, \fBint\fR \fIstruct_type\fR);
27 This routine is part of the \fBXTI\fR interfaces which evolved from the
28 \fBTLI\fR interfaces. \fBXTI\fR represents the future evolution of these
29 interfaces. However, \fBTLI\fR interfaces are supported for compatibility. When
30 using a \fBTLI\fR routine that has the same name as an \fBXTI\fR routine, the
31 \fBtiuser.h\fR header file must be used. Refer to the \fBTLI\fR
32 \fBCOMPATIBILITY\fR section for a description of differences between the two
36 The \fBt_free()\fR function frees memory previously allocated by
37 \fBt_alloc\fR(3NSL). This function will free memory for the specified
38 structure, and will also free memory for buffers referenced by the structure.
41 The argument \fIptr\fR points to one of the seven structure types described for
42 \fBt_alloc\fR(3NSL), and \fIstruct_type\fR identifies the type of that
43 structure which must be one of the following:
49 T_OPTMGMT struct t_optmgmt
51 T_UNITDATA struct t_unitdata
52 T_UDERROR struct t_uderr
59 where each of these structures is used as an argument to one or more transport
63 The function \fBt_free()\fR will check the \fIaddr\fR, \fIopt\fR and
64 \fIudata\fR fields of the given structure, as appropriate, and free the buffers
65 pointed to by the \fIbuf\fR field of the \fBnetbuf\fR structure. If \fIbuf\fR
66 is a null pointer, \fBt_free()\fR will not attempt to free memory. After all
67 buffers are freed, \fBt_free()\fR will free the memory associated with the
68 structure pointed to by \fIptr\fR.
71 Undefined results will occur if \fIptr\fR or any of the \fIbuf\fR pointers
72 points to a block of memory that was not previously allocated by
77 Upon successful completion, a value of \fB0\fR is returned. Otherwise, a
78 value of -1 is returned and \fBt_errno\fR is set to indicate an error.
82 ALL - apart from \fBT_UNINIT\fR.
86 On failure, \fBt_errno\fR is set to the following:
90 \fB\fBTNOSTRUCTYPE\fR\fR
93 Unsupported \fIstruct_type\fR requested.
102 This error indicates that a communication problem has been detected between XTI
103 and the transport provider for which there is no other suitable XTI error
113 A system error has occurred during execution of this function.
116 .SH TLI COMPATIBILITY
119 The \fBXTI\fR and \fBTLI\fR interface definitions have common names but use
120 different header files. This, and other semantic differences between the two
121 interfaces are described in the subsections below.
122 .SS "Interface Header"
125 The \fBXTI\fR interfaces use the header file, \fBxti.h\fR. \fBTLI\fR interfaces
126 should \fInot\fR use this header. They should use the header:
134 .SS "Error Description Values"
137 The \fBt_errno\fR value that can be set by the \fBXTI\fR interface and cannot
138 be set by the \fBTLI\fR interface is:
151 See \fBattributes\fR(5) for descriptions of the following attributes:
159 ATTRIBUTE TYPE ATTRIBUTE VALUE
167 \fBt_alloc\fR(3NSL), \fBattributes\fR(5)