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https://github.com/VK3FNG/soundmodem.git
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84 lines
3.1 KiB
C
84 lines
3.1 KiB
C
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/*****************************************************************************/
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/*
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* openpty.c -- openpty.
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*
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* From glibc2, Copyright (C) Free Software Foundation
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* Modified by Thomas Sailer, sailer@ife.ee.ethz.ch
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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 of the License, or
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* (at your option) 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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/*****************************************************************************/
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#ifndef HAVE_OPENPTY
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <termios.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <errno.h>
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int openpty(int *amaster, int *aslave, char *name, struct termios *termp, struct winsize *winp)
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{
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char line[11];
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const char *cp1, *cp2;
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int master, slave, ttygid;
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struct group *gr;
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strcpy (line, "/dev/ptyXX");
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if (gr = getgrnam("tty"))
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ttygid = gr->gr_gid;
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else
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ttygid = -1;
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for (cp1 = "pqrs"; *cp1; cp1++) {
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line[8] = *cp1;
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for (cp2 = "0123456789abcdef"; *cp2; cp2++) {
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line[9] = *cp2;
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if ((master = open(line, O_RDWR, 0)) == -1) {
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if (errno == ENOENT)
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return (-1); /* out of ptys */
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} else {
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line[5] = 't';
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(void)chown(line, getuid(), ttygid);
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(void)chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
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#ifdef HAVE_REVOKE
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revoke(line);
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#endif
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if ((slave = open(line, O_RDWR, 0)) != -1) {
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*amaster = master;
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*aslave = slave;
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if (name)
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strcpy(name, line);
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if (termp)
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(void)tcsetattr(slave, TCSAFLUSH, termp);
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if (winp)
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(void)ioctl(slave, TIOCSWINSZ, (char *)winp);
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return 0;
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}
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(void)close(master);
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line[5] = 'p';
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}
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}
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}
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errno = ENOENT; /* out of ptys */
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return -1;
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}
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#endif /* HAVE_OPENPTY */
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