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1.´´½¨.soÎļþ
add.h
 #ifndef ADD_H
#define ADD_H
int add(int arg1,int arg2);
#endif

add.c
#include "add.h"
int add(int arg1,int arg2)
{
return arg1 + arg2;
}
±àÒëΪ.oÎļþ:
gcc -fPIC -c add.c
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gcc -shared -Wl,-soname,libadd.so.1 -o libadd.so.1.0 add.o
cp libadd.so.1.0 libadd.so
ÕâÑù¾ÍÉú³ÉÁËlibadd.so¿âÎļþ¡£ÐÞ¸ÄLD_LIBRARY_PATH,½«libadd.so¼ÓÈ뵽·¾¶ÖС£
2.¼ÓÔØ.soÎļþ£¬µ÷Óú¯Êý¡£
dltest.c,²Î¿¼man 3 dlopen °ïÖúÎļþÖеÄÀý×Ó¡£
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
int main(int argc, char **argv)
{
void *handle;
int (*add)(int,int);
char *error;
handle = dlopen ("libadd.so", RTLD_LAZY);
if (!handle) {
fprintf (stderr, "%s\n", dlerror());
exit(1);
}
dlerror(); /* Clear any existing error */
add = dlsym(handle, "add");
if ((error = dlerror()) != NULL) {
fprintf (stderr, "%s\n", error);
exit(1);
}
printf ("%d\n", add(3,5));
dlclose(handle);
return 0;
}
±àÒ룺
 gcc -rdynamic -o dltest dltest.c -ldl
Ö´ÐÐdltestµÃµ½½á¹ûΪ8¡£


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