rpcgen(1)

NAME

rrppccggeenn - an RPC protocol compiler

SYNOPSIS

rrppccggeenn infile
rrppccggeenn [[--DDname[[==value]]]] [[--TT]] [[--KK secs]] infile
rrppccggeenn --cc||--hh||--ll||--mm||--MM||--tt [[--oo outfile ]] infile
rrppccggeenn [[--II]] --ss nettype [[--oo outfile]] infile
rrppccggeenn --nn netid [[--oo outfile]] infile

DESCRIPTION

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

rrppccggeenn 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 pprroottoo..xx, then rrppccggeenn will generate a header file in pprroottoo..hh, XDR routines in pprroottoo__xxddrr..cc, server-side stubs in pprroottoo__ssvvcc..cc, and clientside stubs in pprroottoo__ccllnntt..cc. With the --TT option, it will also generate the RPC dispatch table in pprroottoo__ttbbll..ii. With the --SScc 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 pprroottoo__cclliieenntt..cc. With the --SSss option, it will also generate a sample server code which would illustrate how to write the remote procedures. This code would be created in pprroottoo__sseerrvveerr..cc.

The server created can be started both by the port monitors (for example, iinneettdd or lliisstteenn) or by itself. When it is started by a port monitor, it creates servers only for the transport for which the file descriptor 00 was passed. The name of the transport must be specified by setting up the environmental variable PPMM__TTRRAANNSSPPOORRTT. When the server generated by rrppccggeenn is executed, it creates server handles for all the transports specified in NNEETTPPAATTHH environment variable, or if it is unset, it creates server handles for all the visible transports from //eettcc//nneettccoonnffiigg file. Note: the transports are chosen at run time and not at compile time.

When built for a port monitor (rrppccggeenn --II), and that the server is selfstarted, it backgrounds itself by default. A special define symbol RRPPCC__SSVVCC__FFGG 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 ##ddeeffiinneess and RPC dispatch tables. The entries in the RPC dispatch table contain:

o pointers to the service routine corresponding to that proce

dure,

o a pointer to the input and output arguments
o 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 rrppccggeenn is executed with the --ss option, it creates servers for that particular class of transports. When executed with the --nn option, it creates a server for the transport specified by netid. If infile is not specified, rrppccggeenn accepts the standard input.

The C preprocessor, cccc --EE [see cccc(1)], is run on the input file before it is actually interpreted by rrppccggeenn. For each type of output file, rrppccggeenn defines a special preprocessor symbol for use by the rrppccggeenn programmer:

RRPPCC__HHDDRR defined when compiling into header files RRPPCC__XXDDRR defined when compiling into XDR routines RRPPCC__SSVVCC defined when compiling into server-side stubs RRPPCC__CCLLNNTT defined when compiling into client-side stubs RRPPCC__TTBBLL defined when compiling into RPC dispatch tables

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

For every data type referred to in infile, rrppccggeenn assumes that there exists a routine with the string xxddrr__ 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:

--aa Generate all the files including sample code for client and

server side.

--bb This generates code for the SunOS4.1 style of rpc. It is for

backward compatibility. This is the default.

--55 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.

--cc Compile into XDR routines.

--CC Generate code in ANSI C. This option also generates code that

could be compiled with the C++ compiler. This is the default.

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

--DDname[[==value]]

Define a symbol name. Equivalent to the ##ddeeffiinnee directive in the source. If no value is given, value is defined as 11. This option may be specified more than once.

--hh Compile into CC data-definitions (a header file). --TT option can

be used in conjunction to produce a header file which supports RPC dispatch tables.

--II Generate a service that can be started from inetd. The default

is to generate a static service that handles transports selected with --ss. Using --II allows starting a service by either method.

--KK secs

By default, services created using rrppccggeenn wait 112200 seconds after servicing a request before exiting. That interval can be changed using the --KK flag. To create a server that exits immediately upon servicing a request, --KK 00 can be used. To create a server that never exits, the appropriate argument is --KK --11.

When monitoring for a server, some portmonitors, like lliisstteenn(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, rrppccggeenn should be used with --KK --11.

--ll Compile into client-side stubs.

--mm 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.

--MM Generate multithread-safe stubs for passing arguments and

results between rpcgen-generated code and user written code. This option is useful for users who want to use threads in their code.

--nn 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.

--NN Use the newstyle of rpcgen. This allows procedures to have mul

tiple arguments. 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.

--oo outfile

Specify the name of the output file. If none is specified, standard output is used (--cc, --hh, --ll, --mm, --nn, --ss, --SScc, --SSmm, --SSss, and --tt modes only).

--ss nettype

Compile into server-side stubs for all the transports belonging to the class nettype. The supported classes are nneettppaatthh, vviissiibbllee, cciirrccuuiitt__nn, cciirrccuuiitt__vv, ddaattaaggrraamm__nn, ddaattaaggrraamm__vv, ttccpp, and uuddpp [see rrppcc(3N) for the meanings associated with these classes]. This option may be specified more than once. Note: the transports are chosen at run time and not at compile time.

--SScc 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.

--SSmm Generate a sample Makefile which can be used for compiling the

application.

--SSss Generate skeleton code for the remote procedures on the server

side. You would need to fill in the actual code for the remote procedures.

--tt Compile into RPC dispatch table.

--TT Generate the code to support RPC dispatch tables.

The options --cc, --hh, --ll, --mm, --ss and --tt are used exclusively to generate a particular type of file, while the options --DD and --TT are global and can be used with the other options.

NOTES

The RPC Language does not support nesting of structures. As a workaround, structures 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 --nn option refers to the transport indicated by netid and hence is very site specific.

EXAMPLE

The following example:

$$ rrppccggeenn --TT pprroott..xx

generates the five files: pprroott..hh, pprroott__ccllnntt..cc, pprroott__ssvvcc..cc, pprroott__xxddrr..cc and pprroott__ttbbll..ii.

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

$$ rrppccggeenn --hh pprroott..xx

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

$$ rrppccggeenn --ss ddaattaaggrraamm__nn --DDTTEESSTT pprroott..xx

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

$$ rrppccggeenn --nn ttccpp --oo pprroott__ssvvcc..cc pprroott..xx

SEE ALSO

cccc(1).

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