DragonOS/user/apps/c_unitest/test_pty.c

#include <fcntl.h>
#include <pty.h>
#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>

int main() {
  int ptm, pts;
  char name[256];
  struct termios term;

  if (openpty(&ptm, &pts, name, NULL, NULL) == -1) {
    perror("openpty");
    exit(EXIT_FAILURE);
  }

  printf("slave name: %s fd: %d\n", name, pts);

  tcgetattr(pts, &term);
  term.c_lflag &= ~(ICANON | ECHO);
  term.c_cc[VMIN] = 1;
  term.c_cc[VTIME] = 0;
  tcsetattr(pts, TCSANOW, &term);

  printf("before print to pty slave\n");
  dprintf(pts, "Hello world!\n");

  char buf[256];
  ssize_t n = read(ptm, buf, sizeof(buf));
  if (n > 0) {
    printf("read %ld bytes from slave: %.*s", n, (int)n, buf);
  }

  dprintf(ptm, "hello world from master\n");

  char nbuf[256];
  ssize_t nn = read(pts, nbuf, sizeof(nbuf));
  if (nn > 0) {
    printf("read %ld bytes from master: %.*s", nn, (int)nn, nbuf);
  }

  close(ptm);
  close(pts);

  return 0;
}