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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dlfcn.h>
#include <ctype.h>
typedef void (*func_t)(const char *);
void
dltest(const char *s)
{
printf("From dltest: ");
for(;*s; s++) {
putchar(toupper(*s));
}
putchar('\n');
}
main(int argc, char **argv)
{
void *handle;
func_t fptr;
char *libname = "libfoo.so";
char **name = NULL;
char *funcname = "foo";
char *param = "Dynamic Loading Test";
int ch;
int mode;
while((ch = getopt(argc, argv, "a:b:f:l:")) != EOF) {
switch(ch) {
case 'a':
param = optarg;
break;
case 'b':
switch(*optarg) {
case 'l':
mode = DL_LAZY;
break;
case 'n':
mode = DL_NOW;
break;
}
break;
case 'l':
libname = optarg;
break;
case 'f':
funcname = optarg;
break;
}
}
handle = dlopen(libname, mode);
if(handle == NULL) {
fprintf(stderr, "%s: dlopen: '%s'\n", libname, dlerror());
exit(1);
}
fptr = (func_t)dlsym(handle, funcname);
if(fptr == NULL) {
fprintf(stderr, "%s: dlsym: '%s'\n", funcname, dlerror());
exit(1);
}
name = (char **)dlsym(handle, "libname");
if(name == NULL) {
fprintf(stderr, "libname: dlsym: '%s'\n", dlerror());
exit(1);
}
printf("Call '%s' in '%s':\n", funcname, *name);
(*fptr)(param);
dlctl(handle, DL_DUMP_MAP, NULL);
dlclose(handle);
printf("After 'dlclose()'\n");
dlctl(handle, DL_DUMP_MAP, NULL);
return(0);
}
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