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xdr_admin(3c)
xdr_admin(3C) Standard C Library Functions xdr_admin(3C)
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
DESCRIPTION
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.
Routines
See rpc(3C) for the definition of the XDR data structure. Note that any
buffers passed to the XDR routines must be properly aligned. It is sug‐
gested either that malloc(3C) be used to allocate these buffers, or
that the programmer ensure that the buffer address is evenly divisible
by four.
#include <rpc/xdr.h>
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. There‐
fore, applications written for portability should not depend on
this feature.
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 appli‐
cations 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_cre‐
ate(). See xdr_create(3C). 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_cre‐
ate(). 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_cre‐
ate(). 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_cre‐
ate(). See xdr_create(3C). 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 other‐
wise.
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.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ MT-LevelSafe
SEE ALSO
rpc(3C), malloc(3C), xdr_complex(3C), xdr_create(3C), xdr_simple(3C),
attributes(7)
Oracle Solaris 11.4 11 May 2021 xdr_admin(3C)