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<td width="68%" background="DDl_back2.jpg" height="44"><big><big><font face="黑体"><p align="center"> ● UNIX网络编程 (BM: clown) </font></big></big></td></tr>
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<tr><td width="100%" colspan="2" height="100" align="center" valign="top"><br><p align="center">[<a href="index.htm">回到开始</a>][<a href="15.htm">上一层</a>][<a href="558.htm">下一篇</a>]
<hr><p align="left"><small> <br>
发信人: cloudsky (小四), 信区: Security ;32mWWW-POSTm <br>
<br>
标 题: RPC/XDR/NFS系列之----RPC编程初战(1) <br>
<br>
发信站: 武汉白云黄鹤站 (Sun Feb 20 11:45:28 2000) , 站内信件 <br>
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<br>
<br>
★ rpcgen产生的client代码 <br>
<br>
<br>
<br>
[scz@ /home/scz/src]> cat rdict_clnt.c <br>
<br>
/* <br>
<br>
* Please do not edit this file. <br>
<br>
* It was generated using rpcgen. <br>
<br>
*/ <br>
<br>
<br>
<br>
<br>
#include <memory.h> /* for memset */ <br>
<br>
#include "rdict.h" <br>
<br>
<br>
<br>
/* Default timeout can be changed using clnt_control() */ <br>
<br>
static struct timeval TIMEOUT = { 25, 0 }; <br>
<br>
<br>
<br>
(xdrproc_t) xdr_wrapstring, (caddr_t) argp, <br>
<br>
(xdrproc_t) xdr_int, (caddr_t) &clnt_res, <br>
<br>
TIMEOUT) != RPC_SUCCESS) { <br>
<br>
return (NULL); <br>
<br>
<br>
} <br>
<br>
return (&clnt_res); <br>
<br>
} <br>
<br>
<br>
<br>
int * <br>
<br>
deletew_1(char **argp, CLIENT *clnt) <br>
<br>
{ <br>
<br>
static int clnt_res; <br>
<br>
<br>
<br>
memset((char *)&clnt_res, 0, sizeof(clnt_res)); <br>
<br>
if (clnt_call (clnt, DELETEW, <br>
<br>
<br>
(xdrproc_t) xdr_wrapstring, (caddr_t) argp, <br>
<br>
(xdrproc_t) xdr_int, (caddr_t) &clnt_res, <br>
<br>
TIMEOUT) != RPC_SUCCESS) { <br>
<br>
return (NULL); <br>
<br>
} <br>
<br>
return (&clnt_res); <br>
<br>
} <br>
<br>
<br>
<br>
int * <br>
<br>
lookupw_1(char **argp, CLIENT *clnt) <br>
<br>
{ <br>
<br>
<br>
static int clnt_res; <br>
<br>
<br>
<br>
memset((char *)&clnt_res, 0, sizeof(clnt_res)); <br>
<br>
if (clnt_call (clnt, LOOKUPW, <br>
<br>
(xdrproc_t) xdr_wrapstring, (caddr_t) argp, <br>
<br>
(xdrproc_t) xdr_int, (caddr_t) &clnt_res, <br>
<br>
TIMEOUT) != RPC_SUCCESS) { <br>
<br>
return (NULL); <br>
<br>
} <br>
<br>
return (&clnt_res); <br>
<br>
} <br>
<br>
<br>
[scz@ /home/scz/src]> <br>
<br>
<br>
<br>
rdict_clnt.c是个源程序，它将成为本程序分布式版中client端的tub通信例程。 <br>
<br>
<br>
<br>
该文件为调用远程程序中的每个远程过程准备好了一个client端的stub通信例程。 <br>
<br>
<br>
<br>
<br>
<br>
这个文件中的代码很有意思，在系列文章的后续部分我们会回头来研究它们， <br>
<br>
尤其是clnt_call()函数的使用。现在暂且就这样放到一边去。 <br>
<br>
<br>
<br>
★ rpcgen产生的server代码 <br>
<br>
<br>
<br>
<br>
[scz@ /home/scz/src]> cat rdict_svc.c <br>
<br>
/* <br>
<br>
* Please do not edit this file. <br>
<br>
* It was generated using rpcgen. <br>
<br>
*/ <br>
<br>
<br>
<br>
#include "rdict.h" <br>
<br>
#include <stdio.h> <br>
<br>
#include <stdlib.h> <br>
<br>
#include <rpc/pmap_clnt.h> <br>
<br>
<br>
#include <string.h> <br>
<br>
#include <memory.h> <br>
<br>
#include <sys/socket.h> <br>
<br>
#include <netinet/in.h> <br>
<br>
<br>
<br>
#ifndef SIG_PF <br>
<br>
#define SIG_PF void(*)(int) <br>
<br>
#endif <br>
<br>
<br>
<br>
static void <br>
<br>
rdictprog_1(struct svc_req *rqstp, register SVCXPRT *transp) <br>
<br>
<br>
{ <br>
<br>
union { <br>
<br>
char *insertw_1_arg; <br>
<br>
char *deletew_1_arg; <br>
<br>
char *lookupw_1_arg; <br>
<br>
} argument; <br>
<br>
char *result; <br>
<br>
xdrproc_t _xdr_argument, _xdr_result; <br>
<br>
char *(*local)(char *, struct svc_req *); <br>
<br>
<br>
<br>
<br>
<br>
<br>
switch (rqstp->rq_proc) { <br>
<br>
case NULLPROC: <br>
<br>
(void) svc_sendreply (transp, (xdrproc_t) xdr_void, <br>
<br>
(char *)NULL); <br>
<br>
<br>
<br>
return; <br>
<br>
<br>
<br>
case INITW: <br>
<br>
_xdr_argument = (xdrproc_t) xdr_void; <br>
<br>
_xdr_result = (xdrproc_t) xdr_int; <br>
<br>
local = (char *(*)(char *, struct svc_req *)) <br>
<br>
<br>
initw_1_svc; <br>
<br>
break; <br>
<br>
<br>
<br>
<br>
<br>
case INSERTW: <br>
<br>
_xdr_argument = (xdrproc_t) xdr_wrapstring; <br>
<br>
_xdr_result = (xdrproc_t) xdr_int; <br>
<br>
local = (char *(*)(char *, struct svc_req *)) <br>
<br>
insertw_1_svc; <br>
<br>
break; <br>
<br>
<br>
<br>
<br>
case DELETEW: <br>
<br>
_xdr_argument = (xdrproc_t) xdr_wrapstring; <br>
<br>
_xdr_result = (xdrproc_t) xdr_int; <br>
<br>
local = (char *(*)(char *, struct svc_req *)) <br>
<br>
deletew_1_svc; <br>
<br>
break; <br>
<br>
<br>
<br>
case LOOKUPW: <br>
<br>
_xdr_argument = (xdrproc_t) xdr_wrapstring; <br>
<br>
_xdr_result = (xdrproc_t) xdr_int; <br>
<br>
local = (char *(*)(char *, struct svc_req *)) <br>
<br>
<br>
lookupw_1_svc; <br>
<br>
break; <br>
<br>
<br>
<br>
default: <br>
<br>
svcerr_noproc (transp); <br>
<br>
return; <br>
<br>
} <br>
<br>
memset ((char *)&argument, 0, sizeof (argument)); <br>
<br>
if (!svc_getargs (transp, _xdr_argument, (caddr_t) &argument)) <br>
<br>
{ <br>
<br>
svcerr_decode (transp); <br>
<br>
<br>
return; <br>
<br>
} <br>
<br>
result = (*local)((char *)&argument, rqstp); <br>
<br>
if (result != NULL && !svc_sendreply(transp, _xdr_result, <br>
<br>
result)) { <br>
<br>
svcerr_systemerr (transp); <br>
<br>
} <br>
<br>
if (!svc_freeargs (transp, _xdr_argument, (caddr_t) <br>
<br>
&argument)) { <br>
<br>
fprintf (stderr, "\nunable to free arguments\n"); <br>
<br>
exit (1); <br>
<br>
<br>
} <br>
<br>
return; <br>
<br>
} <br>
<br>
<br>
<br>
int <br>
<br>
main (int argc, char **argv) <br>
<br>
{ <br>
<br>
register SVCXPRT *transp; <br>
<br>
<br>
<br>
pmap_unset (RDICTPROG, RDICTVERS); <br>
<br>
<br>
<br>
<br>
transp = svcudp_create(RPC_ANYSOCK); <br>
<br>
if (transp == NULL) { <br>
<br>
fprintf (stderr, "\ncannot create udp service.\n"); <br>
<br>
exit(1); <br>
<br>
} <br>
<br>
if (!svc_register(transp, RDICTPROG, RDICTVERS, rdictprog_1, <br>
<br>
IPPROTO_UDP)) { <br>
<br>
[scz@ /home/scz/src]> <br>
<br>
<br>
<br>
rdict_svc.c包含有server在开始时要执行的主程序，包括获得一个协议端口号， <br>
<br>
<br>
<br>
<br>
象端口映射器(portmap/rpcbind)注册RPC程序，接着便等待接收RPC调用。它将每 <br>
<br>
<br>
<br>
个调用分派给合适的server端的stub接口例程，当被调用的远程过程响应时， <br>
<br>
server创建一个RPC应答并将它发送回client。 <br>
<br>
<br>
<br>
scz注：虽然rdict_svc.c的注释中建议你不要修改它，但我必须告诉你，如果你不 <br>
<br>
把 <br>
<br>
fprintf (stderr, ...)语句中增加适当的\n的话，会很不友好地得到那些 <br>
<br>
<br>
<br>
出错信息。所以我已经增加了不少\n进去，你得到的代码一定没有这些额 <br>
<br>
外的 <br>
<br>
\n，这只能说是rpcgen的愚蠢，后面我们会注意到这个问题。 <br>
<br>
<br>
<br>
[scz@ /home/scz/src]> gcc -O3 -o rdict_clnt.o -c rdict_clnt.c <br>
<br>
[scz@ /home/scz/src]> gcc -O3 -o rdict_svc.o -c rdict_svc.c <br>
<br>
[scz@ /home/scz/src]> gcc -O3 -o rdict_xdr.o -c rdict_xdr.c <br>
<br>
<br>
</small><hr>
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