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Annotation of 43BSDTahoe/ucb/window/wwpty.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1983 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  */
                     17: 
                     18: #ifndef lint
                     19: static char sccsid[] = "@(#)wwpty.c    3.15 (Berkeley) 6/29/88";
                     20: #endif /* not lint */
                     21: 
                     22: #include "ww.h"
                     23: 
                     24: wwgetpty(w)
                     25: register struct ww *w;
                     26: {
                     27:        register char c, *p;
                     28:        int tty;
                     29:        int on = 1;
                     30: #define PTY "/dev/XtyXX"
                     31: #define _PT    5
                     32: #define _PQRS  8
                     33: #define _0_9   9
                     34: 
                     35:        (void) strcpy(w->ww_ttyname, PTY);
                     36:        for (c = 'p'; c <= 'u'; c++) {
                     37:                w->ww_ttyname[_PT] = 'p';
                     38:                w->ww_ttyname[_PQRS] = c;
                     39:                w->ww_ttyname[_0_9] = '0';
                     40:                if (access(w->ww_ttyname, 0) < 0)
                     41:                        break;
                     42:                for (p = "0123456789abcdef"; *p; p++) {
                     43:                        w->ww_ttyname[_PT] = 'p';
                     44:                        w->ww_ttyname[_0_9] = *p;
                     45:                        if ((w->ww_pty = open(w->ww_ttyname, 2)) < 0)
                     46:                                continue;
                     47:                        w->ww_ttyname[_PT] = 't';
                     48:                        if ((tty = open(w->ww_ttyname, 2)) < 0) {
                     49:                                (void) close(w->ww_pty);
                     50:                                continue;
                     51:                        }
                     52:                        (void) close(tty);
                     53:                        if (ioctl(w->ww_pty, TIOCPKT, (char *)&on) < 0) {
                     54:                                (void) close(w->ww_pty);
                     55:                                continue;
                     56:                        }
                     57:                        return 0;
                     58:                }
                     59:        }
                     60:        w->ww_pty = -1;
                     61:        wwerrno = WWE_NOPTY;
                     62:        return -1;
                     63: }

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