Return to wwrint.c CVS log

Up to [CSRG BSD Unix] / 43BSDTahoe / ucb / window

Annotation of 43BSDTahoe/ucb/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:  * 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[] = "@(#)wwrint.c   3.7 (Berkeley) 6/29/88";
                     20: #endif /* not lint */
                     21: 
                     22: #include "ww.h"
                     23: #include <fcntl.h>
                     24: #include <sys/signal.h>
                     25: 
                     26: /*
                     27:  * Tty input interrupt handler.
                     28:  * (1) Read input into buffer (wwib*).
                     29:  * (2) Set the interrupt flag if anything is read.
                     30:  * Currently, the last is used to get out of the blocking
                     31:  * select() in wwiomux().
                     32:  * To avoid race conditions, we only modify wwibq in here, except
                     33:  * when the buffer is empty; and everywhere else, we only change wwibp.
                     34:  * It should be completely safe.
                     35:  */
                     36: wwrint()
                     37: {
                     38:        register n;
                     39: 
                     40:        if (wwibp == wwibq)
                     41:                wwibp = wwibq = wwib;
                     42:        wwnread++;
                     43:        (void) fcntl(0, F_SETFL, FNDELAY|wwnewtty.ww_fflags);
                     44:        n = read(0, wwibq, wwibe - wwibq);
                     45:        (void) fcntl(0, F_SETFL, wwnewtty.ww_fflags);
                     46:        if (n > 0) {
                     47:                wwibq += n;
                     48:                wwnreadc += n;
                     49:                wwsetintr();
                     50:        } else if (n == 0)
                     51:                wwnreadz++;
                     52:        else
                     53:                wwnreade++;
                     54: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.