104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
/* $Id: pty.c,v 1.1 2000/08/30 18:27:01 armin Exp $
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*
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* ttyId - CAPI TTY AT-command emulator
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*
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* based on the AT-command emulator of the isdn4linux
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* kernel subsystem.
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*
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* Copyright 2000 by Armin Schindler (mac@melware.de)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Log: pty.c,v $
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* Revision 1.1 2000/08/30 18:27:01 armin
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* Okay, here is the first try for an user-land
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* ttyI daemon. Compilable but not useable.
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*
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*
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*/
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#include "ttyId.h"
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#include "pty.h"
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/*
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* get_pty - get a pty master/slave pair and chown the slave side
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* to the uid given. Assumes slave_name points to >= 16 bytes of space.
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*/
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int
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get_pty(int *master_fdp, char *slave_name)
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{
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int i, mfd, sfd = -1;
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char pty_name[16];
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#ifdef TIOCGPTN
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/*
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* Try the unix98 way first.
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*/
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mfd = open("/dev/ptmx", O_RDWR | O_NONBLOCK);
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if (mfd >= 0) {
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int ptn;
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if (ioctl(mfd, TIOCGPTN, &ptn) >= 0) {
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sprintf(pty_name, "/dev/pts/%d", ptn);
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chmod(pty_name, S_IRUSR | S_IWUSR);
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#ifdef TIOCSPTLCK
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ptn = 0;
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if (ioctl(mfd, TIOCSPTLCK, &ptn) < 0)
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logit(LOG_ERR,"Couldn't unlock pty slave %s", pty_name);
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#endif
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sfd = 1;
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}
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}
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#endif /* TIOCGPTN */
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if (sfd < 0) {
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/* the old way - scan through the pty name space */
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for (i = 0; i < 64; ++i) {
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sprintf(pty_name, "/dev/pty%c%x",
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'p' + i / 16, i % 16);
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mfd = open(pty_name, O_RDWR | O_NONBLOCK, 0);
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if (mfd >= 0) {
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pty_name[5] = 't';
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sfd = 1;
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break;
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}
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close(mfd);
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}
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}
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if (sfd < 0)
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return 0;
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strcpy(slave_name, pty_name);
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*master_fdp = mfd;
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return 1;
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}
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int
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create_devicelink(char *old, char *new)
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{
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if (symlink(old, new)) {
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logit(LOG_ERR,"Unable to create link to %s", new);
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return 1;
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}
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return 0;
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}
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int
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writepty(unsigned char *buf, int len)
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{
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return(write(pty_fd, buf, len));
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}
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