Return to wwrint.c CVS log

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

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

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)wwrint.c   3.4 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: #include <fcntl.h>
        !            13: #include <sys/signal.h>
        !            14: 
        !            15: /*
        !            16:  * Tty input interrupt handler.
        !            17:  * (1) Read input into buffer (wwib*).
        !            18:  * (2) If the flag wwsetjmp is true, do longjmp(wwjmpbuf) for asyncronous
        !            19:  *     actions, and to avoid race conditions, clear wwsetjmp.
        !            20:  * Currently, the last is used to get out of the blocking
        !            21:  * select() in wwiomux().
        !            22:  * To avoid race conditions, we only modify wwibq in here, except
        !            23:  * when the buffer is empty; and everywhere else, we only change wwibp.
        !            24:  * It should be completely safe.
        !            25:  */
        !            26: wwrint()
        !            27: {
        !            28:        register n;
        !            29: 
        !            30:        if (wwibp == wwibq)
        !            31:                wwibp = wwibq = wwib;
        !            32:        wwnread++;
        !            33:        (void) fcntl(0, F_SETFL, FNDELAY|wwnewtty.ww_fflags);
        !            34:        n = read(0, wwibq, wwibe - wwibq);
        !            35:        (void) fcntl(0, F_SETFL, wwnewtty.ww_fflags);
        !            36:        if (n > 0) {
        !            37:                wwibq += n;
        !            38:                wwnreadc += n;
        !            39:        } else if (n == 0)
        !            40:                wwnreadz++;
        !            41:        else
        !            42:                wwnreade++;
        !            43:        if (wwinterrupt() && wwsetjmp) {
        !            44:                wwsetjmp = 0;
        !            45:                (void) sigsetmask(sigblock(0) & ~sigmask(SIGIO));
        !            46:                longjmp(wwjmpbuf, 1);
        !            47:        }
        !            48: }

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