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/*******************************************************************************
* Copyright (c) 2002, 2009 QNX Software Systems and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* QNX Software Systems - initial API and implementation
*******************************************************************************/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <termios.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <grp.h>
#include <termios.h>
#include <stdlib.h>
/**
* This is taken from R. W. Stevens book.
* Alain Magloire.
*/
int ptym_open (char *pts_name);
int ptys_open (int fdm, const char * pts_name);
int
openpty(int *amaster, int *aslave, char *name, struct termios *termp, struct winsize *winp)
{
char line[20];
line[0]=0;
*amaster = ptym_open(line);
if (*amaster < 0)
return -1;
*aslave = ptys_open(*amaster, line);
if (*aslave < 0) {
close(*amaster);
return -1;
}
if (name)
strcpy(name, line);
#ifndef TCSAFLUSH
#define TCSAFLUSH TCSETAF
#endif
if (termp)
(void) tcsetattr(*aslave, TCSAFLUSH, termp);
#ifdef TIOCSWINSZ
if (winp)
(void) ioctl(*aslave, TIOCSWINSZ, (char *)winp);
#endif
return 0;
}
int
ptym_open(char * pts_name)
{
char *ptr1, *ptr2;
int fdm;
strcpy(pts_name, "/dev/ptyXY");
/* array index: 012345689 (for references in following code) */
for (ptr1 = "pqrstuvwxyzPQRST"; *ptr1 != 0; ptr1++) {
pts_name[8] = *ptr1;
for (ptr2 = "0123456789abcdef"; *ptr2 != 0; ptr2++) {
pts_name[9] = *ptr2;
/* try to open master */
fdm = open(pts_name, O_RDWR);
if (fdm < 0) {
if (errno == ENOENT) {/* different from EIO */
return -1; /* out of pty devices */
} else {
continue; /* try next pty device */
}
}
pts_name[5] = 't'; /* chage "pty" to "tty" */
return fdm; /* got it, return fd of master */
}
}
return -1; /* out of pty devices */
}
int
ptys_open(int fdm, const char * pts_name)
{
int gid, fds;
struct group *grptr;
grptr = getgrnam("tty");
if (grptr != NULL) {
gid = grptr->gr_gid;
} else {
gid = -1; /* group tty is not in the group file */
}
/* following two functions don't work unless we're root */
chown(pts_name, getuid(), gid);
chmod(pts_name, S_IRUSR | S_IWUSR | S_IWGRP);
fds = open(pts_name, O_RDWR);
if (fds < 0) {
close(fdm);
return -1;
}
#if defined(TIOCSCTTY)
/* TIOCSCTTY is the BSD way to acquire a controlling terminal. */
if (ioctl(fds, TIOCSCTTY, (char *)0) < 0) {
// ignore error: this is expected in console-mode
}
#endif
return fds;
}
void
set_noecho(int fd)
{
struct termios stermios;
if (tcgetattr(fd, &stermios) < 0) {
return ;
}
/* turn off echo */
stermios.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
/* Turn off the NL to CR/NL mapping ou output. */
/*stermios.c_oflag &= ~(ONLCR);*/
stermios.c_iflag |= (IGNCR);
tcsetattr(fd, TCSANOW, &stermios);
}
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