# 2.11BSD#431 - /usr/src/ucb/window/wwrint.c

##### Functions

    wwrint            X

       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(0L) & ~sigmask(SIGIO));
      46:         longjmp(wwjmpbuf, 1);
      47:     }
      48: }

#### Defined functions

wwrint defined in line 26; used 2 times

- in /usr/src/ucb/window/mloop.c line 15
- in /usr/src/ucb/window/ww.h line 220

#### Defined variables

sccsid defined in line 2; never used

Last modified: 1989-12-30 Generated: 2016-12-26 | Generated by src2html V0.67 page hit count: 545 |