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Annotation of 43BSDReno/usr.bin/window/wwrint.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:  * 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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