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Annotation of 43BSDReno/usr.bin/window/wwpty.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Edward Wang at The University of California, Berkeley.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms are permitted provided
        !             9:  * that: (1) source distributions retain this entire copyright notice and
        !            10:  * comment, and (2) distributions including binaries display the following
        !            11:  * acknowledgement:  ``This product includes software developed by the
        !            12:  * University of California, Berkeley and its contributors'' in the
        !            13:  * documentation or other materials provided with the distribution and in
        !            14:  * all advertising materials mentioning features or use of this software.
        !            15:  * Neither the name of the University nor the names of its contributors may
        !            16:  * be used to endorse or promote products derived from this software without
        !            17:  * specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            19:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            20:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #ifndef lint
        !            24: static char sccsid[] = "@(#)wwpty.c    3.18 (Berkeley) 6/6/90";
        !            25: #endif /* not lint */
        !            26: 
        !            27: #include "ww.h"
        !            28: #ifdef POSIX_TTY
        !            29: #include <sys/ioctl.h>
        !            30: #endif
        !            31: 
        !            32: wwgetpty(w)
        !            33: register struct ww *w;
        !            34: {
        !            35:        register char c, *p;
        !            36:        int tty;
        !            37:        int on = 1;
        !            38: #define PTY "/dev/XtyXX"
        !            39: #define _PT    5
        !            40: #define _PQRS  8
        !            41: #define _0_9   9
        !            42: 
        !            43:        (void) strcpy(w->ww_ttyname, PTY);
        !            44:        for (c = 'p'; c <= 'u'; c++) {
        !            45:                w->ww_ttyname[_PT] = 'p';
        !            46:                w->ww_ttyname[_PQRS] = c;
        !            47:                w->ww_ttyname[_0_9] = '0';
        !            48:                if (access(w->ww_ttyname, 0) < 0)
        !            49:                        break;
        !            50:                for (p = "0123456789abcdef"; *p; p++) {
        !            51:                        w->ww_ttyname[_PT] = 'p';
        !            52:                        w->ww_ttyname[_0_9] = *p;
        !            53:                        if ((w->ww_pty = open(w->ww_ttyname, 2)) < 0)
        !            54:                                continue;
        !            55:                        w->ww_ttyname[_PT] = 't';
        !            56:                        if ((tty = open(w->ww_ttyname, 2)) < 0) {
        !            57:                                (void) close(w->ww_pty);
        !            58:                                continue;
        !            59:                        }
        !            60:                        (void) close(tty);
        !            61:                        if (ioctl(w->ww_pty, TIOCPKT, (char *)&on) < 0) {
        !            62:                                (void) close(w->ww_pty);
        !            63:                                continue;
        !            64:                        }
        !            65:                        return 0;
        !            66:                }
        !            67:        }
        !            68:        w->ww_pty = -1;
        !            69:        wwerrno = WWE_NOPTY;
        !            70:        return -1;
        !            71: }

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