Is it possible to get the function address of a function that is inside an exe?

  Output:
    build/release-linux-ppc64/ioq3ded.ppc64
    build/release-linux-ppc64/ioquake3.ppc64
    build/release-linux-ppc64/baseq3/cgameppc64.so
    build/release-linux-ppc64/baseq3/qagameppc64.so
    build/release-linux-ppc64/baseq3/uippc64.so
    build/release-linux-ppc64/missionpack/cgameppc64.so
    build/release-linux-ppc64/missionpack/qagameppc64.so
    build/release-linux-ppc64/missionpack/uippc64.so

make[2]: Entering directory `/r/home7/XXX/ioquake3'
make[2]: `build/release-linux-ppc64/ioq3ded.ppc64' is up to date.
make[2]: `build/release-linux-ppc64/ioquake3.ppc64' is up to date.
LD build/release-linux-ppc64/baseq3/cgameppc64.so
LD build/release-linux-ppc64/baseq3/qagameppc64.so
LD build/release-linux-ppc64/baseq3/uippc64.so
LD build/release-linux-ppc64/missionpack/cgameppc64.so
LD build/release-linux-ppc64/missionpack/qagameppc64.so
LD build/release-linux-ppc64/missionpack/uippc64.so

//Called function
__declspec(dllexport) void UnLinkLinkroutingcache( void )
{
      //code
}

//Callback location
#include<windows.h>
typedef void (* fUnLinkLinkroutingcache_t)( void );
void fUnLinkLinkroutingcache( fUnLinkLinkroutingcache_t pUnLinkLinkroutingcache )
{
	pUnLinkLinkroutingcache(); return;
}
fUnLinkLinkroutingcache_t pUnLinkLinkroutingcache;
void callUnlinkLink(void)
{
	HMODULE hLib;
	//fUnLinkLinkroutingcache_t pUnLinkLinkroutingcache;

	hLib = LoadLibrary(TEXT("ioquake3.exe"));
	if (hLib == NULL)
		{
		//Module not found, permission denied, ...
		return 0; //inform caller of error
		}

	pUnLinkLinkroutingcache = (fUnLinkLinkroutingcache_t)GetProcAddress(hLib, TEXT("UnLinkLinkroutingcache"));
	if ( pUnLinkLinkroutingcache == NULL)
	{
		return 0;
	}

	fUnLinkLinkroutingcache(pUnLinkLinkroutingcache);
}

//Called function
extern void UnLinkLinkroutingcache( void )

//Callback location
void callUnlinkLink(void)
{
	void* handle;
	void (*initializer)(void);
	FILE *fp;//zgzg2020

	fp = fopen("HereIsMe.txt", "a");
	if( fp != NULL )
	{
		fprintf(fp, "%d", 1 );
		fprintf(fp, "\n" );
	}
	fclose(fp);

	handle = dlopen("./ioq3ded.ppc64", RTLD_LAZY);
	if(handle == NULL) {
		// report error ...
		fp = fopen("ICantFindFile.txt", "a");
		if( fp != NULL )
		{
			fprintf(fp, "%d", 1 );
			fprintf(fp, "\n" );
		}
		fclose(fp);
		exit(1);return;
	} else {
		initializer = dlsym(handle,"UnLinkLinkroutingcache");
		if(initializer == NULL) {
			// report error ...
			fp = fopen("ICantFindFfunction.txt", "a");
			if( fp != NULL )
			{
				fprintf(fp, "%d", 1 );
				fprintf(fp, "\n" );
			}
			fclose(fp);
			exit(1);return;
		} else {
			// cast initializer to its proper type and use
			(*initializer)();
		}
		// use the result in a call to dlsym
	}
}