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Annotation of 43BSDReno/usr.bin/window/wwrint.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[] = "@(#)wwrint.c   3.10 (Berkeley) 6/6/90";
        !            25: #endif /* not lint */
        !            26: 
        !            27: #include "ww.h"
        !            28: #include <fcntl.h>
        !            29: 
        !            30: /*
        !            31:  * Tty input interrupt handler.
        !            32:  * (1) Read input into buffer (wwib*).
        !            33:  * (2) Set the interrupt flag if anything is read.
        !            34:  * Currently, the last is used to get out of the blocking
        !            35:  * select() in wwiomux().
        !            36:  * To avoid race conditions, we only modify wwibq in here, except
        !            37:  * when the buffer is empty; and everywhere else, we only change wwibp.
        !            38:  * It should be completely safe.
        !            39:  */
        !            40: wwrint()
        !            41: {
        !            42:        register n;
        !            43: 
        !            44:        if (wwibp == wwibq)
        !            45:                wwibp = wwibq = wwib;
        !            46:        wwnread++;
        !            47:        (void) fcntl(0, F_SETFL, FNDELAY|wwnewtty.ww_fflags);
        !            48:        n = read(0, wwibq, wwibe - wwibq);
        !            49:        (void) fcntl(0, F_SETFL, wwnewtty.ww_fflags);
        !            50:        if (n > 0) {
        !            51:                wwibq += n;
        !            52:                wwnreadc += n;
        !            53:                wwsetintr();
        !            54:        } else if (n == 0)
        !            55:                wwnreadz++;
        !            56:        else
        !            57:                wwnreade++;
        !            58: }

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