# $B%9%l%C%ICf$N(B IO#flush $B$GI=\<($,Mp$l$k(B

**URL:** <https://www.ruby-forum.com/t/b-9-l-c-icf-n-b-io-flush-b-gi-mp-l-k-b/136661>\
**Category:** Development\
**Created:** [May 5, 2008, 9:45am UTC](https://www.ruby-forum.com/t/b-9-l-c-icf-n-b-io-flush-b-gi-mp-l-k-b/136661 "2008-05-05T09:45:12Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![wanabe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/51bf81/32.png) [@wanabe](https://www.ruby-forum.com/u/wanabe)\
**Post date:** [May 5, 2008, 9:45am UTC](https://www.ruby-forum.com/t/b-9-l-c-icf-n-b-io-flush-b-gi-mp-l-k-b/136661/1 "2008-05-05T09:45:12Z")

</div>

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e$B%9%l%C%ICf$GJ8;z?t$,e(B PIPE\_BUF e$B$N#2G\0J\>e$NJ8;zNs$re(B  
IO#flush e$B$7$?\>l9g!“J8;zNs$,ES@Z$l$k$3$H$,$”$j$^$9!#e(B  
e$B$^$?F1MM$KJ8;z?t$,e(B PIPE\_BUF e$B0J\>e$NJ8;zNs$G$Oe(B  
e$B=PNO$KM\>J,$JJ8;zNs$,$D$/$3$H$,$"$j$^$9!#e(B  
e$B$-$A$s$HE,59e(B flush e$B$r$7$F$/$l$kC\<Kv$G$O:F8=$7$^$;$s!#e(B

e$B6qBNE\*$K$O!"0J2\<$N$h$&$J%9%/%j%W%H$G5/$3$j$($^$9!#e(B

Thread.new do  
print " "\*2047 + “foo”  
STDOUT.flush  
print “.”\*1025  
STDOUT.flush  
end  
sleep 0.1

PIPE\_BUF == 1024 e$B$N\<j85$N4D6-e(B(Mingw + MSYS + rxvt)e$B$G$Oe(B  
e$B6uGrNs!“e(Bfooe$B!”%I%C%HNs$H$$$C$?=PNO$rF@$k$O$:$,e(B  
e$B6uGrNs!“e(Bfe$B!”%I%C%HNs!"6uGrNs!"e(Bfe$B$H$$$&=PNO$K$J$C$F$7$^$$$^$9!#e(B

e$B:F8=$9$kC\<Kv$,\>/$J$$$H;W$$!“D9$a$K@bL@$5$;$F$$$?$@$-$^$7$?!#e(B  
e$B$/$I$/$J$C$F$7$^$$?=$7Lu$”$j$^$;$s!#%Q%C%A$OC;$$$G$9!#e(B

# Index: io.c

— io.c (revision 16278)  
+++ io.c (working copy)  
@@ -584,8 +584,8 @@  
return 0;  
}  
if (0 \<= r) {

- 

```
   fptr->wbuf_off = r;

```

- 

```
   fptr->wbuf_len = r;

```

- 

```
   fptr->wbuf_off += r;

```

- 

```
   fptr->wbuf_len -= r;
   errno = EAGAIN;

```

}  
if (rb\_io\_wait\_writable(fptr-\>fd)) {