rpcgen - phpMan

rpcgen(1) rpcgen(1)

NAME
rpcgen - an RPC protocol compiler

SYNOPSIS
rpcgen infile
rpcgen [-Dname[=value]] [-T] [-K secs] infile
rpcgen -c|-h|-l|-m|-t [-o outfile ] infile
rpcgen [-I] -s nettype [-o outfile] infile
rpcgen -n netid [-o outfile] infile

DESCRIPTION
rpcgen is a tool that generates C code to implement an RPC protocol. The input to
rpcgen is a language similar to C known as RPC Language (Remote Procedure Call Lan-
guage).

rpcgen is normally used as in the first synopsis where it takes an input file and
generates up to four output files. If the infile is named proto.x, then rpcgen
will generate a header file in proto.h, XDR routines in proto_xdr.c, server-side
stubs in proto_svc.c, and client-side stubs in proto_clnt.c. With the -T option,
it will also generate the RPC dispatch table in proto_tbl.i. With the -Sc option,
it will also generate sample code which would illustrate how to use the remote
procedures on the client side. This code would be created in proto_client.c. With
the -Ss option, it will also generate a sample server code which would illustrate
how to write the remote procedures. This code would be created in proto_server.c.

The server created can be started both by the port monitors (for example, inetd or
listen) or by itself. When it is started by a port monitor, it creates servers
only for the transport for which the file descriptor 0 was passed. The name of the
transport must be specified by setting up the environmental variable PM_TRANSPORT.
When the server generated by rpcgen is executed, it creates server handles for all
the transports specified in NETPATH environment variable, or if it is unset, it
creates server handles for all the visible transports from /etc/netconfig file.
Note: the transports are chosen at run time and not at compile time. When the
server is self-started, it backgrounds itself by default. A special define symbol
RPC_SVC_FG can be used to run the server process in foreground.

The second synopsis provides special features which allow for the creation of more
sophisticated RPC servers. These features include support for user provided
#defines and RPC dispatch tables. The entries in the RPC dispatch table contain:
? pointers to the service routine corresponding to that procedure,
? a pointer to the input and output arguments
? the size of these routines
A server can use the dispatch table to check authorization and then to execute the
service routine; a client library may use it to deal with the details of storage
management and XDR data conversion.

The other three synopses shown above are used when one does not want to generate
all the output files, but only a particular one. Some examples of their usage is
described in the EXAMPLE section below. When rpcgen is executed with the -s
option, it creates servers for that particular class of transports. When executed
with the -n option, it creates a server for the transport specified by netid. If
infile is not specified, rpcgen accepts the standard input.

The C preprocessor, cc -E [see cc(1)], is run on the input file before it is actu-
ally interpreted by rpcgen. For each type of output file, rpcgen defines a special
preprocessor symbol for use by the rpcgen programmer:

RPC_HDR defined when compiling into header files
RPC_XDR defined when compiling into XDR routines
RPC_SVC defined when compiling into server-side stubs
RPC_CLNT defined when compiling into client-side stubs
RPC_TBL defined when compiling into RPC dispatch tables

Any line beginning with '%' is passed directly into the output file, uninterpreted
by rpcgen.

For every data type referred to in infile, rpcgen assumes that there exists a rou-
tine with the string xdr_ prepended to the name of the data type. If this routine
does not exist in the RPC/XDR library, it must be provided. Providing an undefined
data type allows customization of XDR routines.

The following options are available:

-a Generate all the files including sample code for client and server side.

-b This generates code for the SunOS4.1 style of rpc. It is for backward com-
patibilty. This is the default.

-5 This generates code for the SysVr4 style of rpc. It is used by the Transport
Independent RPC that is in Svr4 systems. By default rpcgen generates code
for SunOS4.1 stype of rpc.

-c Compile into XDR routines.

-C Generate code in ANSI C. This option also generates code that could be com-
piled with the C++ compiler. This is the default.

-k Generate code in K&R C. The default is ANSI C.

-Dname[=value]
Define a symbol name. Equivalent to the #define directive in the source.
If no value is given, value is defined as 1. This option may be specified
more than once.

-h Compile into C data-definitions (a header file). -T option can be used in
conjunction to produce a header file which supports RPC dispatch tables.

-I Generate a service that can be started from inetd. The default is to gener-
ate a static service that handles transports selected with -s. Using -I
allows starting a service by either method.

-K secs
By default, services created using rpcgen wait 120 seconds after servicing a
request before exiting. That interval can be changed using the -K flag. To
create a server that exits immediately upon servicing a request, -K 0 can be
used. To create a server that never exits, the appropriate argument is
-K -1.

When monitoring for a server, some portmonitors, like listen(1M), always
spawn a new process in response to a service request. If it is known that a
server will be used with such a monitor, the server should exit immediately
on completion. For such servers, rpcgen should be used with -K -1.

-l Compile into client-side stubs.

-m Compile into server-side stubs, but do not generate a "main" routine. This
option is useful for doing callback-routines and for users who need to write
their own "main" routine to do initialization.

-n netid
Compile into server-side stubs for the transport specified by netid. There
should be an entry for netid in the netconfig database. This option may be
specified more than once, so as to compile a server that serves multiple
transports.

-N Use the newstyle of rpcgen. This allows procedures to have multiple argu-
ments. It also uses the style of parameter passing that closely resembles
C. So, when passing an argument to a remote procedure you do not have to
pass a pointer to the argument but the argument itself. This behaviour is
different from the oldstyle of rpcgen generated code. The newstyle is not
the default case because of backward compatibility.

-o outfile
Specify the name of the output file. If none is specified, standard output
is used (-c, -h, -l, -m, -n, -s, -s -sand -t modes only).

-s nettype
Compile into server-side stubs for all the transports belonging to the class
nettype. The supported classes are netpath, visible, circuit_n, circuit_v,
datagram_n, datagram_v, tcp, and udp [see rpc(3N) for the meanings associ-
ated with these classes]. This option may be specified more than once.
Note: the transports are chosen at run time and not at compile time.

-Sc Generate sample code to show the use of remote procedure and how to bind to
the server before calling the client side stubs generated by rpcgen.

-Ss Generate skeleton code for the remote procedures on the server side. You
would need to fill in the actual code for the remote procedures.

-t Compile into RPC dispatch table.

-T Generate the code to support RPC dispatch tables.

The options -c, -h, -l, -m, -s and -t are used exclusively to generate a particular
type of file, while the options -D and -T are global and can be used with the other
options.

NOTES
The RPC Language does not support nesting of structures. As a work-around, struc-
tures can be declared at the top-level, and their name used inside other structures
in order to achieve the same effect.

Name clashes can occur when using program definitions, since the apparent scoping
does not really apply. Most of these can be avoided by giving unique names for
programs, versions, procedures and types.

The server code generated with -n option refers to the transport indicated by netid
and hence is very site specific.

EXAMPLE
The following example:

$ rpcgen -T prot.x

generates the five files: prot.h, prot_clnt.c, prot_svc.c, prot_xdr.c and
prot_tbl.i.

The following example sends the C data-definitions (header file) to the standard
output.

$ rpcgen -h prot.x

To send the test version of the -DTEST, server side stubs for all the transport
belonging to the class datagram_n to standard output, use:

$ rpcgen -s datagram_n -DTEST prot.x

To create the server side stubs for the transport indicated by netid tcp, use:

$ rpcgen -n tcp -o prot_svc.c prot.x