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/*
VPI code allowing you to connect terminal emulator or other program to pty "connected"
to the UART-like port in IP core simulated in GHDL.
This code is written by Wojciech M. Zabolotny (wz...@ise.pw.edu.pl) on 2nd June 2011
and is published as PUBLIC DOMAIN
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <linux/ioctl.h>
#include <sys/stat.h>
#include <sys/poll.h>
#include <fcntl.h>
#include <errno.h>
char *ptsname(int fd);
int ptyf = -1;
int tty_open(int a)
{
ptyf = open("/dev/ptmx",O_RDWR);
if(ptyf<0) {
perror("I can't open pseudoterminal\n");
return -1;
}
if(unlockpt(ptyf)<0) {
perror("I can't unlock pseudoterminal\n");
return -1;
}
if(grantpt(ptyf)<0) {
perror("I can't grant pseudoterminal\n");
return -1;
}
printf("Pseudoterminal: %s\n",ptsname(ptyf));
// sleep(10);
return 0;
}
int read_enable(void)
{
//In the masks below you may omit POLLHUP in this case
//disconnection of the terminal emulator from pty will not
//stop simulation, and you'll be able to reconnect
//the same or different program to pty and running simulation
struct pollfd pfd[1]={{ptyf,POLLIN | POLLERR | POLLHUP,0}};
int res;
res=poll(pfd,1,0);
if(res==0) return 0;
if(res<0) return 0; //error
//If you removed POLLHUP from the mask above, you should remove it below too
if(pfd[0].revents & (POLLERR|POLLHUP)) return 0; //disconnected or error?
if(pfd[0].revents & POLLIN) return 1;
return 0;
}
int read_data(void)
{
unsigned char c;
read(ptyf,&c,1);
return c;
}
int write_data(int byte)
{
unsigned char c = byte;
write(ptyf,&c,1);
// Debug: printf("Writing %x to pty\n", c);
return 0;
}
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