询问关于动态连接的问题

smallfist

我编写了三个小程序：UPPERCASE.c,lowercase.c和dltest.c。现将UPPERCASE.c,lowercase.c编译连接成动态库文件UPPERCASE.so和lowercase.so，dltest文件中完成对这两个动态库的调用，程序  如下
#includ<stdio.h>
#include<string.h>
/* */
/* 1-dll include file and variables */
/* */
#include<dlfcn.h>
void *FunctionLib; /* Handle to shared lib file */
int (*Function)(); /* Pointer to loaded routine */
const char *dlError; /* Pointer to error string */

main( argc, argv )
{
int rc; /* return codes */
char HelloMessage[] = "HeLlO WoRlD\n";

/* */
/* 2-print the original message */
/* */
printf(" dlTest 2-Original message \n");
printf("%s", HelloMessage);

/* */
/* 3-Open Dynamic Loadable Libary with absolute path */
/* */
FunctionLib = dlopen("/home/dlTest/UPPERCASE.so",RTLD_LAZY);
dlError = dlerror();
printf(" dlTest 3-Open Library with absolute path return-%s- \n", dlError);
if( dlError ) exit(1);

/* */
/* 4-Find the first loaded function */
/* */
Function = dlsym( FunctionLib, "printUPPERCASE");
dlError = dlerror();
printf(" dlTest 4-Find symbol printUPPERCASE return-%s- \n", dlError);
if( dlError ) exit(1);

/* */
/* 5-Execute the first loaded function */
/* */
rc = (*Function)( HelloMessage );
printf(" dlTest 5-printUPPERCASE return-%s- \n", dlError);

/* */
/* 6-Close the shared library handle */
/* Note: after the dlclose, "printUPPERCASE" is not loaded */
/* */
rc = dlclose(FunctionLib);
dlError = dlerror();
printf(" dlTest 6-Close handle return-%s-\n",dlError);
if( rc ) exit(1);


/* */
/* 7-Open Dynamic Loadable Libary using LD_LIBRARY path */
/* */
FunctionLib = dlopen("lowercase.so",RTLD_LAZY);
dlError = dlerror();
printf(" dlTest 7-Open Library with relative path return-%s- \n", dlError);
if( dlError ) exit(1);

/* */
/* 8-Find the second loaded function */
/* */
Function = dlsym( FunctionLib, "printLowercase");
dlError = dlerror();
printf(" dlTest 8-Find symbol printLowercase return-%s- \n", dlError);
if( dlError ) exit(1);

/* */
/* 8-execute the second loaded function */
/* */
rc = (*Function)( HelloMessage );
printf(" dlTest 9-printLowercase return-%s- \n", dlError);

/* */
/* 10-Close the shared library handle */
/* */
rc = dlclose(FunctionLib);
dlError = dlerror();
printf(" dlTest 10-Close handle return-%s-\n",dlError);
if( rc ) exit(1);

return(0);

}

然后我用gcc -o dlTest dlTest.c -ldl命令编译成目标程序。运行该程序结果如下：

      HeLlO WoRlD
      段错误


请问大侠这是什么原因阿？该怎么解决？

libinary

？？？
输出不应该是这么少吧？
你先看看是到哪一步出现段错误的。
另外，你的代码应该整理一下，用code标签包起来。