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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="559.htm">下一篇</a>]
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发信人: cloudsky (小四), 信区: Security ;32mWWW-POSTm <br>
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标 题: RPC/XDR/NFS系列之----RPC编程初战(1) <br>
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发信站: 武汉白云黄鹤站 (Sun Feb 20 11:47:16 2000) , 站内信件 <br>
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★ 编写stub接口例程 <br>
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<br>
rpcgen产生的文件并没有构成完整的程序，要求程序员必须编写client和server <br>
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端的stub接口例程，在远程程序中的每个远程过程都必须存在一个stub接口例程。 <br>
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/* rdict_cif.c -- initw, insertw, deletew, lookupw */ <br>
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#include <rpc/rpc.h> <br>
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#include <stdio.h> <br>
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#include "rdict.h" <br>
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/* Client-side stub interface routines written by programmer */ <br>
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extern CLIENT * handle; /* handle for remote procedure */ <br>
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static int * ret; /* tmp storage for return code */ <br>
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/* ------------------------------------------------------------------ <br>
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* initw -- client interface routine that calls initw_1 <br>
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* ------------------------------------------------------------------ <br>
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*/ <br>
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int initw ( void ) <br>
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{ <br>
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ret = initw_1( 0, handle ); <br>
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return( ret == 0 ? 0 : *ret ); <br>
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} /* end of initw */ <br>
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/* ------------------------------------------------------------------ <br>
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* insertw -- client interface routine that calls insertw_1 <br>
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* ------------------------------------------------------------------ <br>
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*/ <br>
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int insertw ( char * word ) <br>
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{ <br>
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char ** arg; /* pointer to argument */ <br>
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arg = &word; <br>
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ret = insertw_1( arg, handle ); <br>
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return( ret == 0 ? 0 : *ret ); <br>
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} /* end of insertw */ <br>
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/* ------------------------------------------------------------------ <br>
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* deletew -- client interface routine that calls deletew_1 <br>
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* ------------------------------------------------------------------ <br>
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*/ <br>
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int deletew ( char * word ) <br>
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{ <br>
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char ** arg; /* pointer to argument */ <br>
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arg = &word; <br>
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ret = deletew_1( arg, handle ); <br>
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return( ret == 0 ? 0 : *ret ); <br>
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} /* end of deletew */ <br>
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/* ------------------------------------------------------------------ <br>
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#include <rpc/rpc.h> <br>
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#include "rdict.h" <br>
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/* Server-side stub interface routines written by programmer */ <br>
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static int retcode; <br>
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/* ------------------------------------------------------------------ <br>
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* initw_1_svc -- server side interface to remote procedure initw <br>
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* ------------------------------------------------------------------ <br>
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*/ <br>
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int * initw_1_svc ( void * v, struct svc_req * s ) <br>
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{ <br>
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retcode = initw(); <br>
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return( &retcode ); <br>
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} /* end of initw_1_svc */ <br>
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/* ------------------------------------------------------------------ <br>
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* insertw_1_svc -- server side interface to remote procedure insertw <br>
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* ------------------------------------------------------------------ <br>
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*/ <br>
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int * insertw_1_svc ( char ** word, struct svc_req * s ) <br>
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{ <br>
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retcode = insertw( *word ); <br>
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return( &retcode ); <br>
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} /* end of insertw_1_svc */ <br>
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/* ------------------------------------------------------------------ <br>
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* deletew_1_svc -- server side interface to remote procedure deletew <br>
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* ------------------------------------------------------------------ <br>
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*/ <br>
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int * deletew_1_svc ( char ** word, struct svc_req * s ) <br>
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{ <br>
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retcode = deletew( *word ); <br>
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return( &retcode ); <br>
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} /* end of deletew_1_svc */ <br>
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/* ------------------------------------------------------------------ <br>
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* lookupw_1_svc -- server side interface to remote procedure lookupw <br>
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因为新版本使用了RPC，程序需要包含<rpc/rpc.h>以及"rdict.h"，后者包含了 <br>
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client和server都要使用的常量的定义。client程序还需要声明并初始化一个 <br>
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句柄(handle)，RPC通信例程使用该句柄与server通信。多数客户机使用已经定 <br>
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义的类型CLIENT声明这个句柄，调用RPC库例程clnt_create来初始化这个句柄。 <br>
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/* rdict.c -- main, nextin */ <br>
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#include <rpc/rpc.h> <br>
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#include <stdlib.h> <br>
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#include <stdio.h> <br>
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#include <ctype.h> <br>
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#include "rdict.h" <br>
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#define MAXWORD 50 /* maximum length of a command or word <br>
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*/ <br>
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#define RMACHINE "localhost" /* name of remote machine */ <br>
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CLIENT * handle; /* handle for remote procedure */ <br>
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/* 函数原型 */ <br>
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int nextin ( char * cmd, char * word ); <br>
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int initw ( void ); <br>
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int insertw ( const char * word ); <br>
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int deletew ( const char * word ); <br>
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int lookupw ( const char * word ); <br>
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/* ------------------------------------------------------------------ <br>
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* main -- insert, delete, or lookup words in a dictionary as <br>
<br>
specified <br>
<br>
* ------------------------------------------------------------------ <br>
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*/ <br>
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int main ( int argc, char * argv[] ) <br>
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{ <br>
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<br>
char word[ MAXWORD + 1 ]; /* space to hold word from input line <br>
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*/ <br>
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char cmd; <br>
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int wordlen; /* length of input word */ <br>
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/* set up connection for remote procedure call */ <br>
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handle = clnt_create( RMACHINE, RDICTPROG, RDICTVERS, "tcp" ); <br>
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if ( handle == 0 ) <br>
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{ <br>
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printf( "Could not contact remote program.\n" ); <br>
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exit( 1 ); <br>
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} <br>
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/* 上面是分布式版字典程序client端增加的代码，与dict1.c做比较 */ <br>
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printf( "Please input:\n" ); <br>
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while ( 1 ) <br>
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{ <br>
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wordlen = nextin( &cmd, word ); <br>
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if ( wordlen < 0 ) <br>
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{ <br>
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exit( 0 ); <br>
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} <br>
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switch ( cmd ) <br>
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{ <br>
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case 'I': /* 初始化 */ <br>
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initw(); <br>
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printf( "Dictionary initialized to empty.\n" ); <br>
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break; <br>
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case 'i': /* 插入 */ <br>
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insertw( word ); <br>
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printf( "%s inserted.\n", word ); <br>
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break; <br>
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case 'd': /* 删除 */ <br>
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if ( deletew( word ) ) <br>
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{ <br>
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printf( "%s deleted.\n", word ); <br>
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} <br>
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else <br>
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{ <br>
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printf( "%s not found.\n", word ); <br>
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} <br>
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break; <br>
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case 'l': /* 查询 */ <br>
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if ( lookupw( word ) ) <br>
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{ <br>
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printf( "%s was found.\n", word ); <br>
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} <br>
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else <br>
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{ <br>
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printf( "%s was not found.\n", word ); <br>
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} <br>
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break; <br>
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case 'q': /* 退出 */ <br>
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printf( "Program quits.\n" ); <br>
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<br>
exit( 0 ); <br>
<br>
break; <br>
<br>
default: /* 非法输入 */ <br>
<br>
printf( "command %c invalid.\n", cmd ); <br>
<br>
break; <br>
<br>
} /* end of switch */ <br>
<br>
} /* end of while */ <br>
<br>
return 0; <br>
<br>
} /* end of main */ <br>
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<br>
<br>
/* ------------------------------------------------------------------ <br>
<br>
<br>
* nextin -- read a command and(possibly) a word from the next input <br>
<br>
line <br>
<br>
* ------------------------------------------------------------------ <br>
<br>
*/ <br>
<br>
<br>
<br>
int nextin ( char * cmd, char * word ) <br>
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{ <br>
<br>
int i, ch; <br>
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ch = getc( stdin ); <br>
<br>
while ( isspace( ch ) ) <br>
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{ <br>
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ch = getc( stdin ); <br>
<br>
} /* end of while */ <br>
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if ( ch == EOF ) <br>
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{ <br>
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return( -1 ); <br>
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} <br>
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*cmd = ( char )ch; <br>
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return( 0 ); <br>
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} <br>
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i = 0; <br>
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while ( !isspace( ch ) ) <br>
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{ <br>
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if ( ++i > MAXWORD ) <br>
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{ <br>
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printf( "error: word too long.\n" ); <br>
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exit( 1 ); <br>
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} <br>
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*word++ = ch; <br>
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[scz@ /home/scz/src]> strip rdict <br>
<br>
[scz@ /home/scz/src]> ./rdict <br>
<br>
Could not contact remote program. <br>
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<br>
[scz@ /home/scz/src]> <br>
<br>
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<br>
★ 编译链接server程序 <br>
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[scz@ /home/scz/src]> cat > rdict_sif.c <br>
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[scz@ /home/scz/src]> gcc -O3 -o rdict_sif.o -c rdict_sif.c <br>
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<br>
/* rdict_srp.c -- initw, insertw, deletew, lookupw */ <br>
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#include <rpc/rpc.h> <br>
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#include "rdict.h" <br>
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/* Server-side remote procedures and the global data they use */ <br>
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char dict[ DICTSIZ ][ MAXWORD + 1 ]; /* storage for a dictionary of <br>
<br>
words */ <br>
<br>
int nwords = 0; /* number of words in the <br>
<br>
dictionary */ <br>
<br>
<br>
<br>
/* ------------------------------------------------------------------ <br>
<br>
* initw -- initialize the dictionary to contain no words at all <br>
<br>
<br>
* ------------------------------------------------------------------ <br>
<br>
*/ <br>
<br>
<br>
<br>
int initw ( void ) <br>
<br>
{ <br>
<br>
nwords = 0; <br>
<br>
return 1; <br>
<br>
} /* end of initw */ <br>
<br>
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<br>
/* ------------------------------------------------------------------ <br>
<br>
* insertw -- insert a word in the dictionary <br>
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<br>
* ------------------------------------------------------------------ <br>
<br>
*/ <br>
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<br>
int insertw ( const char * word ) <br>
<br>
{ <br>
<br>
strcpy( dict[nwords], word ); <br>
<br>
nwords++; <br>
<br>
return( nwords ); <br>
<br>
/* ------------------------------------------------------------------ <br>
<br>
* lookupw -- look up a word in the dictionary <br>
<br>
* ------------------------------------------------------------------ <br>
<br>
<br>
*/ <br>
<br>
<br>
<br>
int lookupw ( const char * word ) <br>
<br>
{ <br>
<br>
int i; <br>
<br>
for ( i = 0; i < nwords; i++ ) <br>
<br>
{ <br>
<br>
if ( strcmp( word, dict[i] ) == 0 ) <br>
<br>
{ <br>
<br>
return( 1 ); <br>
<br>
} <br>
<br>
} /* end of for */ <br>
<br>
return( 0 ); <br>
<br>
} /* end of lookupw */ <br>
<br>
<br>
<br>
[scz@ /home/scz/src]> cat > rdict_srp.c <br>
<br>
[scz@ /home/scz/src]> gcc -O3 -o rdict_srp.o -c rdict_srp.c <br>
<br>
[scz@ /home/scz/src]> gcc -O3 -o rdictd rdict_srp.o rdict_svc.o <br>
<br>
rdict_xdr.o rdict_sif.o <br>
--- <br>
</small><hr>
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