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Annotation of 43BSD/ucb/window/wwpty.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)wwpty.c    3.11 4/24/85";
        !             3: #endif
        !             4: 
        !             5: /*
        !             6:  * Copyright (c) 1983 Regents of the University of California,
        !             7:  * All rights reserved.  Redistribution permitted subject to
        !             8:  * the terms of the Berkeley Software License Agreement.
        !             9:  */
        !            10: 
        !            11: #include "ww.h"
        !            12: 
        !            13: /*
        !            14:  * To satisfy Chris, we allocate pty's backwards, and if
        !            15:  * there are more than the ptyp's (i.e. the ptyq's)
        !            16:  * on the machine, we don't use the p's.
        !            17:  */
        !            18: wwgetpty(w)
        !            19: register struct ww *w;
        !            20: {
        !            21:        register char c;
        !            22:        register int i;
        !            23:        int tty;
        !            24:        int on = 1;
        !            25:        char hasq = 0;
        !            26: #define PTY "/dev/XtyXX"
        !            27: #define _PT    5
        !            28: #define _PQRS  8
        !            29: #define _0_9   9
        !            30: 
        !            31:        (void) strcpy(w->ww_ttyname, PTY);
        !            32:        for (c = 's'; c >= 'p'; c--) {
        !            33:                w->ww_ttyname[_PT] = 'p';
        !            34:                w->ww_ttyname[_PQRS] = c;
        !            35:                w->ww_ttyname[_0_9] = '0';
        !            36:                if (access(w->ww_ttyname, 0) < 0)
        !            37:                        continue;
        !            38:                if (c != 'p')
        !            39:                        hasq = 1;
        !            40:                else if (hasq)
        !            41:                        break;
        !            42:                for (i = 15; i >= 0; i--) {
        !            43:                        w->ww_ttyname[_PT] = 'p';
        !            44:                        w->ww_ttyname[_0_9] = "0123456789abcdef"[i];
        !            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, (int)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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