Date: Tue, 28 Jun 2005 09:25:12 +0300 (EEST) From: Achilleus Mantzios <achill@matrix.gatewaynet.com> To: Ronald Klop <ronald-freebsd8@klop.yi.org> Cc: freebsd-java@freebsd.org Subject: Re: Wierd problem in linux 2.4.18-bf2.4, Java Blackdown-1.4.2-rc1 (Solved) Message-ID: <Pine.LNX.4.44.0506280924160.13307-100000@matrix.gatewaynet.com> In-Reply-To: <op.ss1hxmcj8527sy@outgoing.local>
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O Ronald Klop έγραψε στις Jun 27, 2005 : > On Mon, 27 Jun 2005 11:14:14 +0200, Achilleus Mantzios > <achill@matrix.gatewaynet.com> wrote: > > > > > Forgot my homework.... > > A classic (lack of) consumption of output situation, > > > >> From the java docs: > > > > The Runtime.exec methods may not work well for special processes on > > certain native platforms, such as native windowing processes, daemon > > processes, Win16/DOS processes on Microsoft Windows, or shell scripts. > > The > > created subprocess does not have its own terminal or console. All its > > standard io (i.e. stdin, stdout, stderr) operations will be redirected to > > the parent process through three streams (Process.getOutputStream(), > > Process.getInputStream(), Process.getErrorStream()). The parent process > > uses these streams to feed input to and get output from the subprocess. > > Because some native platforms only provide limited buffer size for > > standard input and output streams, failure to promptly write the input > > stream or read the output stream of the subprocess may cause the > > subprocess to block, and even deadlock. > > > > > > Sorry for the noise, the situation can pretty well > > occur in FreeBSD too when pipe output buffer reaches its limit, > > and at the end of the day i think someone maybe will find this > > useful in the future. > > I always create two threads to copy the output of stdout and stderr to > some place. (/dev/null or a file or System.out). In java 5 you can combine > stdout and stderr, so you only need 1 thread. > Right, altho doing > dev/null 2>&1 in the script itself, saves the extra code. > > > -- -Achilleus
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