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HP-UX Reference > Tt_rcvudata(3)HP-UX 11i Version 3: February 2007 |
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NAMEt_rcvudata() — receive a data unit from remote transport provider user SYNOPSIS#include <xti.h> /* for X/OPEN Transport Interface - XTI */ /* or */ #include <tiuser.h> /* for Transport Layer Interface - TLI */ int t_rcvudata (fd, unitdata, flags); inf fd; struct t_unitdata *unitdata; int *flags; DESCRIPTIONThe t_rcvudata() function is used in connectionless-mode to receive a data unit from a remote transport provider user. The argument fd identifies the local transport endpoint through which data will be received. unitdata holds information associated with the received data unit. flags is set on return to indicate that the complete data unit was not received. The argument unitdata points to a t_unitdata structure containing the following members: struct netbuf addr; struct netbuf opt; struct netbuf udata; The type netbuf structure is defined in the <xti.h> or <tiuser.h> header file. This structure, which is used to define buffer parameters, has the following members:
The maxlen field of addr, opt and udata must be set before calling this function to indicate the maximum size of the buffer for each. On return from this call, addr specifies the protocol address of the sending user, opt identifies protocol-specific options that were associated with this data unit, and udata specifies the user data that was received. By default, t_rcvudata() executes in the synchronous operating mode. The t_rcvudata() function waits for data to arrive at the transport endpoint specified by fd before returning control to the transport user who called this function. However, when the transport endpoint, specified by the fd parameter, has the O_NONBLOCK option set by t_open() or fcntl() function, the t_rcvudata() function executes in asynchronous mode. In asynchronous mode, when a data unit is unavailable, control is immediately returned to the caller. If the buffer defined in the udata field of unitdata is not large enough to hold the current data unit, the buffer will be filled and T_MORE will be set in flags on return to indicate that another t_rcvudata() should be called to retrieve the rest of the data unit. Subsequent calls to t_rcvudata() will return zero for the length of the address and options until the full data unit has been received. RETURN VALUEUpon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and t_errno is set to indicate the error. ERRORSOn failure, t_errno is set to one of the following:
SEE ALSOfcntl(2), t_alloc(3), t_open(3), t_optmgmt(3), t_rcvuderr(3), t_sndudata(3), thread_safety(5). |
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