XDR_READ_PAGES(9) Linux Networking XDR_READ_PAGES(9)NAME
xdr_read_pages - Ensure page-based XDR data to decode is aligned at current pointer position
unsigned int xdr_read_pages(struct xdr_stream * xdr, unsigned int len);
pointer to xdr_stream struct
number of bytes of page data
Moves data beyond the current pointer position from the XDR head buffer into the page list. Any data that lies beyond current position +
"len" bytes is moved into the XDR tail.
Returns the number of XDR encoded bytes now contained in the pages
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xdr_admin(3NSL) Networking Services Library Functions xdr_admin(3NSL)NAME
xdr_admin, xdr_control, xdr_getpos, xdr_inline, xdrrec_endofrecord, xdrrec_eof, xdrrec_readbytes, xdrrec_skiprecord, xdr_setpos, xdr_sizeof
- library routines for external data representation
XDR library routines allow C programmers to describe arbitrary data structures in a machine-independent fashion. Protocols such as remote
procedure calls (RPC) use these routines to describe the format of the data.
These routines deal specifically with the management of the XDR stream.
See rpc(3NSL) for the definition of the XDR data structure. Note that any buffers passed to the XDR routines must be properly aligned. It
is suggested either that malloc(3C) be used to allocate these buffers, or that the programmer insure that the buffer address is divisible
evenly by four.
bool_t xdr_control( XDR *xdrs, int req, void*info);
A function macro to change or retrieve various information about an XDR stream. req indicates the type of operation and info is a
pointer to the information. The supported values of req is XDR_GET_BYTES_AVAIL and its argument type is xdr_bytesrec *. They return the
number of bytes left unconsumed in the stream and a flag indicating whether or not this is the last fragment.
uint_t xdr_getpos(const XDR *xdrs);
A macro that invokes the get-position routine associated with the XDR stream, xdrs. The routine returns an unsigned integer, which
indicates the position of the XDR byte stream. A desirable feature of XDR streams is that simple arithmetic works with this number,
although the XDR stream instances need not guarantee this. Therefore, applications written for portability should not depend on this
long *xdr_inline(XDR *xdrs, const int len);
A macro that invokes the in-line routine associated with the XDR stream, xdrs. The routine returns a pointer to a contiguous piece of
the stream's buffer; len is the byte length of the desired buffer. Note: pointer is cast to long *.
Warning: xdr_inline() may return NULL(0) if it cannot allocate a contiguous piece of a buffer. Therefore the behavior may vary among
stream instances; it exists for the sake of efficiency, and applications written for portability should not depend on this feature.
bool_t xdrrec_endofrecord(XDR *xdrs, int sendnow);
This routine can be invoked only on streams created by xdrrec_create(). See xdr_create(3NSL). The data in the output buffer is marked
as a completed record, and the output buffer is optionally written out if sendnow is non-zero. This routine returns TRUE if it suc-
ceeds, FALSE otherwise.
bool_t xdrrec_eof(XDR *xdrs);
This routine can be invoked only on streams created by xdrrec_create(). After consuming the rest of the current record in the stream,
this routine returns TRUE if there is no more data in the stream's input buffer. It returns FALSE if there is additional data in the
stream's input buffer.
int xdrrec_readbytes(XDR *xdrs, caddr_t addr, uint_t nbytes);
This routine can be invoked only on streams created by xdrrec_create(). It attempts to read nbytes bytes from the XDR stream into the
buffer pointed to by addr. Upon success this routine returns the number of bytes read. Upon failure, it returns -1. A return value of
0 indicates an end of record.
bool_t xdrrec_skiprecord(XDR *xdrs);
This routine can be invoked only on streams created by xdrrec_create(). See xdr_create(3NSL). It tells the XDR implementation that
the rest of the current record in the stream's input buffer should be discarded. This routine returns TRUE if it succeeds, FALSE oth-
bool_t xdr_setpos(XDR *xdrs, const uint_t pos);
A macro that invokes the set position routine associated with the XDR stream xdrs. The parameter pos is a position value obtained from
xdr_getpos(). This routine returns TRUE if the XDR stream was repositioned, and FALSE otherwise.
Warning: it is difficult to reposition some types of XDR streams, so this routine may fail with one type of stream and succeed with
another. Therefore, applications written for portability should not depend on this feature.
unsigned long xdr_sizeof(xdrproc_t func, void *data);
This routine returns the number of bytes required to encode data using the XDR filter function func, excluding potential overhead such
as RPC headers or record markers. 0 is returned on error. This information might be used to select between transport protocols, or to
determine the buffer size for various lower levels of RPC client and server creation routines, or to allocate storage when XDR is used
outside of the RPC subsystem.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|MT-Level |Safe |
SEE ALSO malloc(3C), rpc(3NSL), xdr_complex(3NSL), xdr_create(3NSL), xdr_simple(3NSL), attributes(5)SunOS 5.10 30 Dec 1996 xdr_admin(3NSL)