Example showing a simple usage of PTY without use of fork()

ptymaster.c

#define _XOPEN_SOURCE 600
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>

/*
 * Simple Echo Server that repeats back characters, with a spin
 */
int parrot(int master_fd, int iterations)
{
  int i;
  char rxbuf[1];
  char txbuf[20];
  int bytes_read = 0;
  for (i = 0; i < iterations; i++) {
    bytes_read = read(master_fd, rxbuf, 1);
    if (bytes_read == 1) {
      printf("[Rx]: %c [%02X]\n", rxbuf[0], rxbuf[0]);
      sprintf(txbuf, "Eh! '%c'\n", rxbuf[0]);
      write(master_fd, txbuf, strlen(txbuf));
    }
  }
  return 0;
}


int main(int argc, char **argv)
{
  char *slavepath;
  int pty_master_fd = posix_openpt(O_RDWR);
  (void)grantpt(pty_master_fd);
  (void)unlockpt(pty_master_fd);
  slavepath = ptsname(pty_master_fd);
  printf("Slave Path: %s\n", slavepath);
  return parrot(pty_master_fd, 20);
}

ptyslave.py

import serial

s = serial.Serial(port="/dev/pts/5", timeout=0.01)
s.write("Testing!")
print s.read(1024)