455 lines
14 KiB
HTML
455 lines
14 KiB
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<meta name="DC.Title" content="Example: TI-RPC top-level service API" />
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<meta name="abstract" content="This code example illustrates a top-level service API used in developing TI-RPC services." />
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<meta name="description" content="This code example illustrates a top-level service API used in developing TI-RPC services." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Example: TI-RPC top-level service API</title>
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</head>
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<body id="rzahptopservice"><a name="rzahptopservice"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Example: TI-RPC top-level service API</h1>
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<div><p>This code example illustrates a top-level service API used in developing
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TI-RPC services.</p>
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<div class="section"><p>The development of a service is more complicated at the top level,
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because it requires the developer to write a dispatch routine. At this level,
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when a service request comes in, a dispatch routine is called. The dispatch
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routine must collect the arguments and call the correct local procedure, catch
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all errors and results, and return that information to the client. After dispatch
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function is written, it can be readily copied and used in other services with
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only slight modifications.</p>
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<p>The top, intermediate, and
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expert layers can use the same dispatch function without modification. In
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the following example, the dispatch function is bundled with the other local
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functions in this file. Both files need to be compiled and linked together
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before the service runs. The advantage of the top level over the other layers
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is the ability to specify the NETTYPE as a string, instead of using the network
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selection APIs. After calling the top-level API, the service
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is created, bound to the dispatch function, and registered with the rpcbind
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service.</p>
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<div class="note"><span class="notetitle">Note:</span> By using the code examples, you agree to the terms of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
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<pre>#include <stdio.h>
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#include <netconfig.h>
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#include <rpc/rpc.h>
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#include <errno.h>
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#include "myapp.h"
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int main(int argc, char *argv[]) {
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int num_svc; /* return value for the svc_create() API */
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/* unregister any existing copy of this service */
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/* (void)svc_unreg(program, version) */
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svc_unreg(PROGNUM, VERSNUM);
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/* (int)svc_create(dispatch, prognum, versnum, nettype); */
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num_svc = svc_create(myapp_dispatch, PROGNUM, VERSNUM, NETTYPE);
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/* check for errors calling svc_create() */
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if (num_svc == 0) {
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/* print error messages and exit */
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fprintf(stderr, "Error calling %s.\n", "svc_create");
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fprintf(stderr, "PROG: %lu\nVERS: %lu\tNET: %s\n",
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PROGNUM, VERSNUM, NETTYPE);
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fprintf(stderr, "errno: %d\n", errno);
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return 1;
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}
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/* this should loop indefinitely waiting for client connections */
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svc_run();
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/* if we get here, svc_run() returned */
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fprintf(stderr, "svc_run() returned. ERROR has occurred.\n");
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fprintf(stderr, "errno: %d\n", errno);
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/* clean up by unregistering. then, exit */
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svc_unreg(PROGNUM, VERSNUM);
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return 1;
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} /* end of main() */</pre>
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<pre>/* This is an example of the dispatch function */</pre>
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<pre>#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <pwd.h>
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#include <rpc/rpc.h>
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#include <time.h>
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#include "myapp.h"
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char * myapp_get_uid(char *in) {
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u_int retval; /* return value for this procedure() */
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struct stat sbuf; /* data storage area for stat() */
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int stat_ret; /* return value for stat() */
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char *file = *(char **)in; /* input value for stat() */
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/* (int)stat(filename, struct stat *) */
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stat_ret = stat(file, &sbuf);
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if (stat_ret == -1) {
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retval = (u_int)-1;
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}
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else {
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retval = (u_int)(sbuf.st_uid);
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}
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return (char *)&retval;
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}
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char *myapp_get_uid_string(char *in) {
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char *retval; /* return value for this procedure() */
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struct passwd *pbuf; /* return value for getpwuid() */
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struct stat sbuf; /* data storage area for stat() */
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int stat_ret; /* return value for stat() */
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char *file = *(char **)in; /* input value for stat() */
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/* (int)stat(filename, struct stat *) */
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stat_ret = stat(file, &sbuf);
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if (stat_ret == -1) {
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retval = (char *)NULL;
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}
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else {
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pbuf = (struct passwd *)getpwuid((uid_t)(sbuf.st_uid));
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if (pbuf == NULL) {
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retval = (char *)NULL;
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}
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else {
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retval = (char *)(pbuf->pw_name);
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}
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}
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return (char *)&retval;
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}
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char * myapp_get_size(char *in) {
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int retval; /* return value for this procedure() */
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struct stat sbuf; /* data storage area for stat() */
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int stat_ret; /* return value for stat() */
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char *file = *(char **)in; /* input value for stat() */
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/* (int)stat(filename, struct stat *) */
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stat_ret = stat(file, &sbuf);
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if (stat_ret == -1) {
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retval = (int)-1;
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}
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else {
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retval = (int)(sbuf.st_size);
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}
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return (char *)&retval;
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}
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char * myapp_get_mtime(char *in) {
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long retval; /* return value for this procedure() */
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struct stat sbuf; /* data storage area for stat() */
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int stat_ret; /* return value for stat() */
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char *file = *(char **)in; /* input value for stat() */
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/* (int)stat(filename, struct stat *) */
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stat_ret = stat(file, &sbuf);
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if (stat_ret == -1) {
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retval = (long)-1;
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}
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else {
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retval = (long)(sbuf.st_mtime);
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}
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return (char *)&retval;
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}
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char *myapp_get_mtime_string(char *in) {
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char *retval; /* return value for this procedure() */
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struct stat sbuf; /* data storage area for stat() */
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int stat_ret; /* return value for stat() */
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char *file = *(char **)in; /* input value for stat() */
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/* (int)stat(filename, struct stat *) */
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stat_ret = stat(file, &sbuf);
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if (stat_ret == -1) {
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retval = (char *)NULL;
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}
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else {
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retval = (char *)ctime((time_t *)&(sbuf.st_mtime));
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}
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return (char *)&retval;
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}
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char * myapp_get_codepage(char *in) {
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u_short retval; /* return value for this procedure() */
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struct stat sbuf; /* data storage area for stat() */
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int stat_ret; /* return value for stat() */
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char *file = *(char **)in; /* input value for stat() */
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stat_ret = stat(file, &sbuf);
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if (stat_ret == -1) {
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retval = (u_short)-1;
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}
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else {
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retval = (u_short)(sbuf.st_codepage);
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}
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return (char *)&retval;
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}
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char *myapp_get_objtype(char *in) {
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char *retval; /* return value for this procedure() */
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struct stat sbuf; /* data storage area for stat() */
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int stat_ret; /* return value for stat() */
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char *file = *(char **)in; /* input value for stat() */
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/* (int)stat(filename, struct stat *) */
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stat_ret = stat(file, &sbuf);
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if (stat_ret == -1) {
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retval = (char *)NULL;
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}
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else {
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retval = (char *)(sbuf.st_objtype);
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}
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return (char *)&retval;
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}
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char *myapp_get_filetype(char *in) {
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char *result = NULL; /* return value for this procedure() */
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struct stat sbuf; /* data storage area for stat() */
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int stat_ret; /* return value for stat() */
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char *file = *(char **)in; /* input value for stat() */
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/* (int)stat(filename, struct stat *) */
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stat_ret = stat(file, &sbuf);
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if (stat_ret == -1) {
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return (char *)NULL;
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}
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if (S_ISDIR(sbuf.st_mode)) {
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result = "Directory";
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}
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if (S_ISREG(sbuf.st_mode)) {
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result = "Regulare File";
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}
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if (S_ISLNK(sbuf.st_mode)) {
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result = "Symbolic Link";
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}
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if (S_ISSOCK(sbuf.st_mode)) {
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result = "Socket";
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}
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if (S_ISNATIVE(sbuf.st_mode)) {
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result = "AS/400 Native Object";
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}
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if (S_ISFIFO(sbuf.st_mode)) {
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result = "FIFO";
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}
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if (S_ISCHR(sbuf.st_mode)) {
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result = "Character Special";
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}
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if (S_ISBLK(sbuf.st_mode)) {
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result = "Block Special";
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}
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return (char *)&result;
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}
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char * myapp_end_server(char *empty) {
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/* char *empty is not used */
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/* function always returns NULL */
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svc_unreg(PROGNUM, VERSNUM);
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return (char *)NULL;
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}
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void myapp_dispatch(struct svc_req *request, SVCXPRT *svc) {
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union {
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/* all of the procedures take a string */
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/* if there were other procedures, it */
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/* might look like this: */
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/* int set_codepage_arg */
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char * filename_arg;
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} argument;
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char *result; /* pointer to returned data from proc */
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xdrproc_t xdr_argument; /* decodes data from client call */
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xdrproc_t xdr_result; /* encodes data to return to client */
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char *(*proc)(char *); /* pointer to local procedure to call */
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switch (request->rq_proc) {
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case NULLPROC:
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/* a special case. always return void */
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(void)svc_sendreply((SVCXPRT *)svc,
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(xdrproc_t)xdr_void,
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(char *)NULL);
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return;
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case GET_UID:
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/* takes a string argument (filename) */
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/* returns an u_int (uid of file ownder) */
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xdr_argument = xdr_wrapstring;
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xdr_result = xdr_u_int;
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proc = (char *(*)(char *))myapp_get_uid;
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break;
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case GET_UID_STRING:
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/* takes a string argument (filename) */
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/* returns a string (owner's name in string format) */
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xdr_argument = xdr_wrapstring;
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xdr_result = xdr_wrapstring;
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proc = (char *(*)(char *))myapp_get_uid_string;
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break;
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case GET_SIZE:
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/* takes a string argument (filename) */
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/* returns an int (size of file in bytes) */
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xdr_argument = xdr_wrapstring;
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xdr_result = xdr_int;
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proc = (char *(*)(char *))myapp_get_size;
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break;
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case GET_MTIME:
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/* takes a string argument (filename) */
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/* returns a long (time last modified) */
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xdr_argument = xdr_wrapstring;
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xdr_result = xdr_long;
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proc = (char *(*)(char *))myapp_get_mtime;
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break;
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case GET_MTIME_STRING:
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/* takes a string argument (filename) */
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/* returns a string (time last modified, string format) */
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xdr_argument = xdr_wrapstring;
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xdr_result = xdr_wrapstring;
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proc = (char *(*)(char *))myapp_get_mtime_string;
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break;
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case GET_CODEPAGE:
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/* takes a string argument (filename) */
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/* returns an u_short (codepage of file) */
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xdr_argument = xdr_wrapstring;
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xdr_result = xdr_u_short;
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proc = (char *(*)(char *))myapp_get_codepage;
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break;
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case GET_OBJTYPE:
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/* takes a string argument (filename) */
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/* returns a string (object type) */
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xdr_argument = xdr_wrapstring;
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xdr_result = xdr_wrapstring;
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proc = (char *(*)(char *))myapp_get_objtype;
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break;
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case GET_FILETYPE:
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/* takes a string argument (filename) */
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/* returns a string (file type) */
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xdr_argument = xdr_wrapstring;
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xdr_result = xdr_wrapstring;
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proc = (char *(*)(char *))myapp_get_filetype;
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break;
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case END_SERVER:
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/* takes no arguments */
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/* returns no data */
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/* unregisters service with local rpcbind daemon */
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xdr_argument = (xdrproc_t)xdr_void;
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xdr_result = (xdrproc_t)xdr_void;
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proc = (char *(*)(char *))myapp_end_server;
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break;
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default:
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/* fall through case. return error to client */
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svcerr_noproc(svc);
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return;
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} /* end switch(request->rq_proc) */
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/* clear the argument */
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memset((char *)&argument, (int)0, sizeof(argument));
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/* decode argument from client using xdr_argument() */
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if (svc_getargs(svc, xdr_argument, (char *)&argument) == FALSE) {
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/* if svc_getargs() fails, return RPC_CANTDECODEARGS to client */
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svcerr_decode(svc);
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return;
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}
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/* call local procedure, passing in pointer to argument */
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result = (char *)(*proc)((char *)&argument);
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/* check first that result isn't NULL */
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/* try to send results back to client. check for failure */
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if ((result != NULL) && (svc_sendreply(svc, xdr_result, result) == FALSE))
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{
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/* send error message back to client */
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svcerr_systemerr(svc);
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}
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/* free the decoded argument's space */
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if (svc_freeargs(svc, xdr_argument, (char *)&argument) == FALSE) {
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/* if unable to free, print error and exit */
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(void)fprintf(stderr, "unable to free arguments\n");
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exit(1);
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}
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} /* end of myapp_dispatch() */</pre>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzahpservicecode.htm" title="Transport independent remote procedure call (TI-RPC) programming provides an effective method for developing distributed client-server based applications on i5/OS.">Examples: Develop service applications based on TI-RPC code</a></div>
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</div>
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</div>
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</body>
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</html> |