pbcopy isn't working in ssh session

Not sure I understand.
I'm logged in.
In a normal terminal windows everything works fine.
If I ssh to my own host from my own host - it's not working.
Processes are running on the same machine in a very
similar environment. I don't see a problem here.
Other than security may be...

I don't know what kind of IPC pbcopy and pbpaste are using to
communicate with windows manager, but I thought
it's something mentioned in a shell environment.
Yes, in an ssh session shell is executed by sshd, not
Terminal, but still it's local process executed with my
permissions. And I completely replicated shell environment
in ssh session to match local session.
I found possible solution in osx hints with LaunchAgents.
Hint was for osx 10.4, and it's not working in 10.5.
It seems that pbcopy isn't working in ssh session
by design, probably for security reasons only.
Probably it's checking processes tree or something like this...
I guess I can emulate remote pbcopy with simple perl script
running in background and temporary file than...

Just checked on osx 10.4.
pbcopy working absolutely fine in ssh session.
So this is yet another thing deliberately broken by apple 😟

If anyone here is interested in my solution to the problem:
Little C++ program called "remoteclipmon.cpp":
#include <stdio.h>
#include <sys/event.h>
#include <unistd.h>
#include <stdlib.h>
#include <string>
#include <signal.h>
#include <errno.h>


static bool stop=false;

extern "C" void sigDisp(int sig)
{
stop=true;
}

int main()
{
sigset(SIGINT,sigDisp);
int kq=kqueue();
if(kq==-1)
{
fprintf(stderr,"failed to create kqueue :%s\n",strerror(errno));
return 1;
}
std::string filePath=getenv("HOME");
if(filePath.length() && *filePath.rbegin()!='/')
{
filePath+='/';
}
filePath+="Documents/remoteclipboard.txt";
std::string cmd="cat " filePath" |/usr/bin/pbcopy";
FILE *f=fopen(filePath.c_str(),"wb+");
if(!f)
{
fprintf(stderr,"failed to open '%s':%s\n",filePath.c_str(),strerror(errno));
return 1;
}
int fd=fileno(f);
struct kevent e={0,};
e.ident=fd;
e.flags=EV_ADD;
e.filter=EVFILT_READ;
while(!stop)
{
kevent(kq,&e,1,&e,1,0);
usleep(10000);
system(cmd.c_str());
ftruncate(fd,0);
}
close(kq);
fclose(f);
return 0;
}

Can be compiled with:
g++ -o remoteclipmon remoteclipmon.cpp
And executed in background:
./remoteclip&
Little local shell script rcopy placed in a bin/ subdirectory in my home directory:
#!/bin/bash
if [ ! -z "$*" ]; then
echo -n $* >$HOME/Documents/remoteclipboard.txt
else
cat >$HOME/Documents/remoteclipboard-temp.txt
cat $HOME/Documents/remoteclipboard-temp.txt >$HOME/Documents/remoteclipboard.txt
rm $HOME/Documents/remoteclipboard-temp.txt
fi

And even smaller remote shell script rcopy:
#!/bin/bash
ssh macmini bin/rcopy $*

Here macmini is name of my host.
Now on remote system I can type:
rcopy hello world
and get 'hello world' in clipboard, or
./some_program |rcopy
and get output of some_program in my local clipboard.