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Man Pages


Manual Reference Pages  - XDR (3)

NAME

xdr, xdr_array, xdr_bool, xdr_bytes, xdr_char, xdr_destroy, xdr_double, xdr_enum, xdr_float, xdr_free, xdr_getpos, xdr_hyper, xdr_inline, xdr_int, xdr_long, xdr_longlong_t, xdrmem_create, xdr_opaque, xdr_pointer, xdrrec_create, xdrrec_endofrecord, xdrrec_eof, xdrrec_skiprecord, xdr_reference, xdr_setpos, xdr_short, xdrstdio_create, xdr_string, xdr_u_char, xdr_u_hyper, xdr_u_int, xdr_u_long, xdr_u_longlong_t, xdr_u_short, xdr_union, xdr_vector, xdr_void, xdr_wrapstring - library routines for external data representation

CONTENTS

Library
Synopsis
Description
See Also

LIBRARY


.Lb libc

SYNOPSIS


.In rpc/types.h
.In rpc/xdr.h

See DESCRIPTION for function declarations.

DESCRIPTION

These routines allow C programmers to describe arbitrary data structures in a machine-independent fashion. Data for remote procedure calls are transmitted using these routines.

int
 

.Fo xdr_array XDR *xdrs char **arrp u_int *sizep u_int maxsize u_int elsize xdrproc_t elproc
.Fc
 

A filter primitive that translates between variable-length arrays and their corresponding external representations. The arrp argument is the address of the pointer to the array, while sizep is the address of the element count of the array; this element count cannot exceed maxsize. The elsize argument is the sizeof each of the array’s elements, and elproc is an XDR filter that translates between the array elements’ C form, and their external representation. This routine returns one if it succeeds, zero otherwise.

int
 
xdr_bool XDR *xdrs bool_t *bp
 

A filter primitive that translates between booleans (C integers) and their external representations. When encoding data, this filter produces values of either one or zero. This routine returns one if it succeeds, zero otherwise.

int
 
xdr_bytes XDR *xdrs char **sp u_int *sizep u_int maxsize
 

A filter primitive that translates between counted byte strings and their external representations. The sp argument is the address of the string pointer. The length of the string is located at address sizep; strings cannot be longer than maxsize. This routine returns one if it succeeds, zero otherwise.

int
 
xdr_char XDR *xdrs char *cp
 

A filter primitive that translates between C characters and their external representations. This routine returns one if it succeeds, zero otherwise. Note: encoded characters are not packed, and occupy 4 bytes each. For arrays of characters, it is worthwhile to consider xdr_bytes, xdr_opaque or xdr_string.

void
 
xdr_destroy XDR *xdrs
 

A macro that invokes the destroy routine associated with the XDR stream, xdrs. Destruction usually involves freeing private data structures associated with the stream. Using xdrs after invoking xdr_destroy is undefined.

int
 
xdr_double XDR *xdrs double *dp
 

A filter primitive that translates between C
.Vt double precision numbers and their external representations. This routine returns one if it succeeds, zero otherwise.

int
 
xdr_enum XDR *xdrs enum_t *ep
 

A filter primitive that translates between C
.Vt enum Ns s (actually integers) and their external representations. This routine returns one if it succeeds, zero otherwise.

int
 
xdr_float XDR *xdrs float *fp
 

A filter primitive that translates between C
.Vt float Ns s and their external representations. This routine returns one if it succeeds, zero otherwise.

void
 
xdr_free xdrproc_t proc char *objp
 

Generic freeing routine. The first argument is the XDR routine for the object being freed. The second argument is a pointer to the object itself. Note: the pointer passed to this routine is not freed, but what it points to is freed (recursively).

u_int
 
xdr_getpos 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.

int
 
xdr_hyper XDR *xdrs quad_t *llp
  A filter primitive that translates between ANSI C
.Vt long long integers and their external representations. This routine returns one if it succeeds, zero otherwise.

long *
 
xdr_inline XDR *xdrs 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
.Vt 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.

int
 
xdr_int XDR *xdrs int *ip
 

A filter primitive that translates between C integers and their external representations. This routine returns one if it succeeds, zero otherwise.

int
 
xdr_long XDR *xdrs long *lp
 

A filter primitive that translates between C
.Vt long integers and their external representations. This routine returns one if it succeeds, zero otherwise.

int
 
xdr_longlong_t XDR *xdrs quad_t *llp
  A filter primitive that translates between ANSI C
.Vt long long integers and their external representations. This routine returns one if it succeeds, zero otherwise.

void
 
xdrmem_create XDR *xdrs char *addr u_int size enum xdr_op op
 

This routine initializes the XDR stream object pointed to by xdrs. The stream’s data is written to, or read from, a chunk of memory at location addr whose length is no more than size bytes long. The op argument determines the direction of the XDR stream (either XDR_ENCODE, XDR_DECODE, or XDR_FREE).

int
 
xdr_opaque XDR *xdrs char *cp u_int cnt
 

A filter primitive that translates between fixed size opaque data and its external representation. The cp argument is the address of the opaque object, and cnt is its size in bytes. This routine returns one if it succeeds, zero otherwise.

int
 
xdr_pointer XDR *xdrs char **objpp u_int objsize xdrproc_t xdrobj
 

Like xdr_reference except that it serializes NULL pointers, whereas xdr_reference does not. Thus, xdr_pointer can represent recursive data structures, such as binary trees or linked lists.

void
 

.Fo xdrrec_create XDR *xdrs u_int sendsize u_int recvsize char *handle int *readit int *writeit
.Fc
 

This routine initializes the XDR stream object pointed to by xdrs. The stream’s data is written to a buffer of size sendsize; a value of zero indicates the system should use a suitable default. The stream’s data is read from a buffer of size recvsize; it too can be set to a suitable default by passing a zero value. When a stream’s output buffer is full, writeit is called. Similarly, when a stream’s input buffer is empty, readit is called. The behavior of these two routines is similar to the system calls read(2) and write(2), except that handle is passed to the former routines as the first argument. Note: the XDR stream’s op field must be set by the caller.

Warning: this XDR stream implements an intermediate record stream. Therefore there are additional bytes in the stream to provide record boundary information.

int
 
xdrrec_endofrecord XDR *xdrs int sendnow
 

This routine can be invoked only on streams created by xdrrec_create. 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 one if it succeeds, zero otherwise.

int
 
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 one if the stream has no more input, zero otherwise.

int
 
xdrrec_skiprecord XDR *xdrs
 

This routine can be invoked only on streams created by xdrrec_create. It tells the XDR implementation that the rest of the current record in the stream’s input buffer should be discarded. This routine returns one if it succeeds, zero otherwise.

int
 
xdr_reference XDR *xdrs char **pp u_int size xdrproc_t proc
 

A primitive that provides pointer chasing within structures. The pp argument is the address of the pointer; size is the sizeof the structure that *pp points to; and proc is an XDR procedure that filters the structure between its C form and its external representation. This routine returns one if it succeeds, zero otherwise.

Warning: this routine does not understand NULL pointers. Use xdr_pointer instead.

int
 
xdr_setpos XDR *xdrs u_int pos
 

A macro that invokes the set position routine associated with the XDR stream xdrs. The pos argument is a position value obtained from xdr_getpos. This routine returns one if the XDR stream could be repositioned, and zero 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.

int
 
xdr_short XDR *xdrs short *sp
 

A filter primitive that translates between C
.Vt short integers and their external representations. This routine returns one if it succeeds, zero otherwise.

#ifdef _STDIO_H_
/* XDR using stdio library */
void
 
xdrstdio_create XDR *xdrs FILE *file enum xdr_op op
 
#endif
 

This routine initializes the XDR stream object pointed to by xdrs. The XDR stream data is written to, or read from, the Standard I/O stream file. The op argument determines the direction of the XDR stream (either XDR_ENCODE, XDR_DECODE, or XDR_FREE).

Warning: the destroy routine associated with such XDR streams calls fflush(3) on the file stream, but never fclose(3).

int
 
xdr_string XDR *xdrs char **sp u_int maxsize
 

A filter primitive that translates between C strings and their corresponding external representations. Strings cannot be longer than maxsize. Note: sp is the address of the string’s pointer. This routine returns one if it succeeds, zero otherwise.

int
 
xdr_u_char XDR *xdrs unsigned char *ucp
 

A filter primitive that translates between
.Vt unsigned C characters and their external representations. This routine returns one if it succeeds, zero otherwise.

int
 
xdr_u_hyper XDR *xdrs u_quad_t *ullp
  A filter primitive that translates between
.Vt unsigned ANSI C
.Vt long long integers and their external representations. This routine returns one if it succeeds, zero otherwise.

int
 
xdr_u_int XDR *xdrs unsigned *up
 

A filter primitive that translates between C
.Vt unsigned integers and their external representations. This routine returns one if it succeeds, zero otherwise.

int
 
xdr_u_long XDR *xdrs unsigned long *ulp
 

A filter primitive that translates between C
.Vt unsigned long integers and their external representations. This routine returns one if it succeeds, zero otherwise.

int
 
xdr_u_longlong_t XDR *xdrs u_quad_t *ullp
  A filter primitive that translates between
.Vt unsigned ANSI C
.Vt long long integers and their external representations. This routine returns one if it succeeds, zero otherwise.

int
 
xdr_u_short XDR *xdrs unsigned short *usp
 

A filter primitive that translates between C
.Vt unsigned short integers and their external representations. This routine returns one if it succeeds, zero otherwise.

int
 

.Fo xdr_union XDR *xdrs enum_t *dscmp char *unp const struct xdr_discrim *choices xdrproc_t defaultarm
.Fc
 

A filter primitive that translates between a discriminated C
.Vt union and its corresponding external representation. It first translates the discriminant of the union located at dscmp. This discriminant is always an
.Vt enum_t . Next the union located at unp is translated. The choices argument is a pointer to an array of
.Vt xdr_discrim structures. Each structure contains an ordered pair of [value, proc]. If the union’s discriminant is equal to the associated value, then the proc is called to translate the union. The end of the
.Vt xdr_discrim structure array is denoted by a routine of value NULL. If the discriminant is not found in the choices array, then the defaultarm procedure is called (if it is not NULL). Returns one if it succeeds, zero otherwise.

int
 

.Fo xdr_vector XDR *xdrs char *arrp u_int size u_int elsize xdrproc_t elproc
.Fc
 

A filter primitive that translates between fixed-length arrays and their corresponding external representations. The arrp argument is the address of the pointer to the array, while size is the element count of the array. The elsize argument is the sizeof each of the array’s elements, and elproc is an XDR filter that translates between the array elements’ C form, and their external representation. This routine returns one if it succeeds, zero otherwise.

int
 
xdr_void void
 

This routine always returns one. It may be passed to RPC routines that require a function argument, where nothing is to be done.

int
 
xdr_wrapstring XDR *xdrs char **sp
 

A primitive that calls xdr_string xdrs sp MAXUN.UNSIGNED; where MAXUN.UNSIGNED is the maximum value of an unsigned integer. The xdr_wrapstring function is handy because the RPC package passes a maximum of two XDR routines as arguments, and xdr_string, one of the most frequently used primitives, requires three. Returns one if it succeeds, zero otherwise.

SEE ALSO

rpc(3)
.Rs eXternal Data Representation Standard: Protocol Specification
.Re
.Rs eXternal Data Representation: Sun Technical Notes
.Re
.Rs XDR: External Data Representation Standard
.Re
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February 16, 1988 XDR (3)

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