rpcgen [-a] [-A] [-b] [-C] [-D name [= value]] [-i size] [-I [-K seconds]] [-L] [-M] [-N] [- T] [-v] [-Y pathname] infile
rpcgen [-c | -h | -l | -m | -t | -Sc | -Ss | -Sm] [-o outfile] [infile]
rpcgen [-s nettype] [-o outfile] [infile]
rpcgen [-n netid] [-o outfile] [infile]
The rpcgen utility 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 Language).
The rpcgen utility is normally used as in the first synopsis where it takes an input file and generates three output files. If the infile is named proto.x, then rpcgen generates a header 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 also generates the RPC dispatch table in proto_tbl.i.
rpcgen can also generate sample client and server files that can be customized to suit a particular application. The -Sc, -Ss, and -Sm options generate sample client, server and makefile, respectively. The -a option generates all files, including sample files. If the infile is proto.x, then the client side sample file is written to proto_client.c, the server side sample file to proto_server.c and the sample makefile to makefile.proto.
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 environment variable PM_TRANSPORT. When the server generated by rpcgen is executed, it creates server handles for all the transports specified in the NETPATH environment variable, or if it is unset, it creates server handles for all the visible transports from the /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:
A server can use the dispatch table to check authorization and then to execute the service routine. A client library may use the dispatch table 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. See the EXAMPLES section below for examples of rpcgen usage. 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.
All the options mentioned in the second synopsis can be used with the other three synopses, but the changes will be made only to the specified output file.
The C preprocessor cc -E is run on the input file before it is actually interpreted by rpcgen. For each type of output file, rpcgen defines a special preprocessor symbol for use by the rpcgen programmer:
Any line beginning with ``%'' is passed directly into the output file, uninterpreted by rpcgen, except that the leading ``%" is stripped off. To specify the path name of the C preprocessor, use the -Y flag.
For every data type referred to in infile, rpcgen assumes that there exists a routine 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 supported:
If there are no pending client requests, the inetd servers exit after 120 seconds (default). The default can be changed with the -K option. All of the error messages for inetd servers are always logged with syslog(3C).
Note: This option is supported for backward compatibility only. It should always be used in conjunction with the -b option which generates backward compatibility code. By default (that is, when -b is not specified), rpcgen generates servers that can be invoked through portmonitors.
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 0.
The options -c, -h, -l, -m, -s, -Sc, -Sm, -Ss, 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.
The following operand is supported:
Example 1 Generating the output files and dispatch table
The following entry
example% rpcgen -T prot.x
generates all the five files: prot.h, prot_clnt.c, prot_svc.c, prot_xdr.c, and prot_tbl.i.
Example 2 Sending headers to standard output
The following example sends the C data-definitions (header) to the standard output:
example% rpcgen -h prot.x
Example 3 Sending a test version
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:
example% rpcgen -s datagram_n -DTEST prot.x
Example 4 Creating server side stubs
To create the server side stubs for the transport indicated by netid tcp, use:
example% rpcgen -n tcp -o prot_svc.c prot.x
See attributes(5) for descriptions of the following attributes:
The rpcgen chapter in the ONC+ Developer's Guide manual.