From: Tanaka Akira <akr@...17n.org>
Date: 2000-11-26T01:47:59+09:00
Subject: [ruby-list:26163] Re: fork problem?

In article <E13zgAK-0005kt-00@ev.netlab.zetabits.co.jp>,
  matz@zetabits.com (Yukihiro Matsumoto) writes:

> |$B$"$H!"(Bfork $B$7$?;R%W%m%;%9Fb$G!"(B(exec $BA0$K(B)$B$$$/$D$+$N%U%!%$%k$r(B close
> |$B$7$?$$$N$G$9$,!"$=$N%U%!%$%k$r;H$C$F$$$k%9%l%C%I$,B>$K$"$k$H(B close $B;~(B
> |$B$K$=$N%9%l%C%I$GNc30$,H/@8$7$F$7$^$$$^$9!#$3$l$rKI$0J}K!$O$J$$$G$7$g$&(B
> |$B$+(B?
> |
> |close-on-exec $B$9$l$P$$$$$N$G$O$J$$$+!"$H$b;W$C$?$N$G$9$,!"(Bsocket $B$J$I(B
> |$B$OFbItE*$K(B dup $B$7$F(B 2$B$D(B file descriptor $B$r;H$C$F$$$k$h$&$G!"(B dup $B$7$?(B
> |$B$b$N$K(B close-on-exec $B$r@_Dj$9$k$3$H$,$G$-$^$;$s$G$7$?(B...
> 
> $B$`$`!"$A$g$C$H%7%A%e%(!<%7%g%s$,A[A|$7$-$l$^$;$s$G$7$?!#$J$s(B
> $B$i$+$NBP1~$r$7$?$$$N$G$9$,!"8=;~E@$G$O$I$N$h$&$JBP1~$,K>$^$7(B
> $B$$$N$+H=CG$G$-$^$;$s!#(B

$B$($'$H!"(Bunix domain socket $B$G$"$k<o$N(B non-forking server $B$r:n$C$F$$$k(B
$B$N$G$9$,!";~$*$j!"$=$NCf$+$i30It$N%3%^%s%I$r5/F0$9$kI,MW$,$"$j$^$9!#(B
$B$3$3$G2?$b9M$($:$K(B fork/exec $B$r;H$C$F%3%^%s%I$r5/F0$9$k$H!"(Bserver $B$,J](B
$B;}$7$F$$$k(B UNIXServer$B$@$N(B UNIXSocket $B$@$N(B($B$KBP1~$9$k(B filede scriptor)
$B$,7Q>5$5$l$k$o$1$G$9!#$=$7$F!"$3$N%3%^%s%I$OD9$$4V@8$-;D$k$N$G!"%H%i%V(B
$B%k(B(EOF $B$,8!=PITG=$K$J$k(B)$B$,5/$-$^$9!#(B

# http://cvs.m17n.org/~akr/cvsconnect/ $B$H$$$&$N$,$=$N(B shell script $B$K(B
# $B$h$k<BAu$G!"$3$l$O$3$l$G(B shell script $B$N2DG=@-$r:FH/8+$G$-$?$H$$$&0U(B
# $BL#$G$O$H$F$bLLGr$+$C$?$N$G$9$,!"$$$m$$$m$H$"$^$j$K$"$s$^$j$J$N$G(B
# Ruby $B$G:n$j$J$*$7$F$$$k$N$G$9!#(B

$B$G!"(Bclose $B$5$($G$-$l$P2r7h$9$k$o$1$G$9$,!"(B

1. $BIaDL$K(B IO#close $B$9$k$H$=$N(B file descriptor $B$rBT$C$F$$$k%9%l%C%I$K(B
   IOError $B$,H/@8$9$k!#(B

  $B$A$c$s$H(B IOError $B$rA4ItJa$^$($l$PF0$/$s$8$c$J$$$+$H$O;W$&$N$G$9$,!"(B
  $B$$$^$N$H$3$m@.8y$7$F$$$^$;$s!#$$$^$R$H$D2?$,5/$-$F$$$k$NGD0.$G$-$J$/(B
  $B$F(B...

2. close-on-exec $B$r@_Dj$7$F$*$/!#(B

  IO#fcntl $B$G$O(B (OpenFile $B$N(B)f2 $B$r07$($J$$$N$G$&$^$/$$$-$^$;$s!#$=$b$=(B
  $B$b!"$J$<(B UNIXServer $B$d(B UNIXSocket $B$O$o$6$o$6(B dup $B$7$F(B f2 $B$r@_Dj$9$k(B
  $B$N$+!"$H$$$&$N$b5?Ld$G$9$,(B... half close $B$J>uBV$rI=8=$9$k$?$a(B?

  # $B$D$$$G$K$$$($P(B socketpair $B$,$"$k4D6-$G$O(B rw $B$J(B popen $B$G$b(B f2 $B$O;H(B
  # $B$o$J$$$G$[$7$$!#(B

3. IO.popen $B$G2fK}$9$k!#(B

  close $B$9$kHO0O$,(B($B;d$N4D6-$G$O(B) 3 - 64 $B$H8GDj!#(B
  64 $B$r1[$($k$HJQ$J$3$H$,5/$3$k$H;W$&!#(B(limit descriptors $B$O(B 1064)

$B$H$$$&$h$&$K!"$H$j$"$($:(B 3$B$D;W$$$D$$$FD4$Y$F8+$?$N$G$9$,!"$I$l$b$&$^$/(B
$B$"$j$^$;$s!#(B

fcntl($B$J$I(B)$B$r(B f2 $B$KH/9T$G$-$k$h$&$K$9$k$+!"(B
fork $B$7$?Ev$N(B thread $B0J30$N(B thread $B$r$9$Y$FM-L5$r8@$o$5$:;&$9$h$&$J(B fork
(Thread.fork_and_kill_other_threads $B$H$+(B?)$B$,$"$k$H$$$$$s$8$c$J$$$+$J$!!"(B
$B$H;W$C$F$$$^$9!#(B

# $B$A$J$_$K!":G=i$O!"(Bsendmsg/recvmsg($B$J$$$7$O(B ioctl)$B$K$h$k(B file
# descriptor $B$N<uEO$7$b8!F$$7$?$N$G$9$,!"(Bruby/perl/python $B$N$I$l$G$b;H(B
# $B$($J$5$=$&$@$C$?$N$GCGG0$7$^$7$?!#(B
-- 
[$BEDCf(B $BE/(B][$B$?$J$+(B $B$"$-$i(B][Tanaka Akira]
$B!V$/$C$@$i$J$$%3%HJ9$$$A$c$C$?$M!<$(C"=(B $B$4$C$a!<$s$(C"=$B!W(B
  ($BKbK!;H$$M\@.@lLg(B $B%^%8%C%/%9%?!<3X1!(B 2, $BFn_7%_%E%-(B)