HP-UX Reference (11i v1 05/09) - 3 Library Functions N-Z (vol 7)

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t_free(3) t_free(3)

NAME

t_free() - free a library structure

SYNOPSIS

#include <xti.h> /* for X/OPEN Transport Interface - XTI */

/* or */

#include <tiuser.h> /* for Transport Layer Interface - TLI */

int t_free (ptr, struct_type);

char *ptr;

int struct_type;

DESCRIPTION

The t_free() function frees memory previously allocated by

t_alloc(). This function will free

memory for the speciﬁed structure and will also free memory for buffers referenced by the structure.

The argument ptr points to one of the seven structure types described for

t_alloc(). struct_type

identiﬁes the type of that structure which must be one of the following:

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

where each of these structures is used as an argument to one or more transport functions.

t_free() will check the addr, opt, and udata ﬁelds of the given structure (as appropriate) and free the

buffers pointed to by the buf ﬁeld of the netbuf structure. If buf is a null pointer,

t_free() will not

attempt to free memory. After all buffers are freed,

t_free() will free the memory associated with the

structure pointed to by ptr.

Undeﬁned results will occur if ptr or any of the buf pointers points to a block of memory that was not previ-

ously allocated by t_alloc().

Thread-Safeness

The t_free() function is safe to be called by multithreaded applications, and it is thread-safe for both

POSIX Threads and DCE User Threads. It is neither async-cancel safe nor async-signal safe. Finally, it is

not fork-safe.

Valid States

All - apart from T_UNINIT

RETURN VALUE

Upon successful completion, a value of 0 is returned. Otherwise, a value of −1 is returned, and

t_errno

is set to indicate the error.

ERRORS

On failure, t_errno is set to the following:

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

[TNOSTRUCTYPE] Unsupported struct_type requested.

[TPROTO] (XTI only) This error indicates that a communication problem has been detected

between XTI and the transport provider for which there is no suitable XTI

(t_errno).