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) 06/29/88"; 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 } 64