Path: csiph.com!usenet.pasdenom.info!news.albasani.net!newsfeed.freenet.ag!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.011 X-Spam-Evidence: '*H*': 0.98; '*S*': 0.00; 'exit': 0.07; 'problem:': 0.07; 'modulo': 0.09; 'subject:skip:m 10': 0.09; 'unsigned': 0.09; '255': 0.16; 'char,': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'subject:Different': 0.16; 'wrote:': 0.17; 'byte': 0.17; 'code.': 0.20; 'this:': 0.23; 'seems': 0.23; 'second': 0.24; 'linux': 0.24; 'header:In-Reply- To:1': 0.25; 'am,': 0.27; 'message-id:@mail.gmail.com': 0.27; 'actual': 0.28; 'probably': 0.29; 'error': 0.30; 'code': 0.31; 'gets': 0.32; 'url:python': 0.32; 'values.': 0.33; 'to:addr :python-list': 0.33; 'received:google.com': 0.34; 'whatever': 0.35; 'something': 0.35; 'but': 0.36; 'url:org': 0.36; 'url:library': 0.36; 'subject:with': 0.36; 'uses': 0.37; 'why': 0.37; 'subject:: ': 0.38; 'url:docs': 0.38; 'to:addr:python.org': 0.39; 'takes': 0.39; 'first': 0.61; 'here:': 0.62; 'it!': 0.64; 'beat': 0.65; 'reply': 0.66; '2013': 0.84 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:content-type; bh=GcGWFHG290n60qDBkaFGQB6y6H8rpsYsjeeeyPY6FKE=; b=KvKWpHaHpc8ihGUpJYLhWVjz+YvQ3IQsPXjr/CWEn1JDIsKrwdLaifbADL806p/kc0 fpoFPg0+v16CQTYsXCeeFFW1+o33G+0+g251u15WRKuaiqB5n816LgXGI3SKyiTtMeFM zrG6kw0tK2arOQWesRNLuIMtwBaS1qaXt5R5YN6GBYrZPVMzE05206+90AubtuCV7I6T xDCkwq54N7Ma3CZKlm/X5C1d21x3mvI+gSpLkayZvi1Wu7LUOkjKlEBUL89/EHhOMCbR JwFLJobD8xQqupI/8OnIwECKFx1UyD90MYYwFacI2G/eu6pVgSAuUa3t5Ra+MT8+I7Od e2wA== MIME-Version: 1.0 X-Received: by 10.221.10.14 with SMTP id oy14mr7781391vcb.34.1362411884507; Mon, 04 Mar 2013 07:44:44 -0800 (PST) In-Reply-To: References: Date: Tue, 5 Mar 2013 02:44:44 +1100 Subject: Re: Different behavior with multiprocessing From: Chris Angelico To: python-list@python.org Content-Type: text/plain; charset=ISO-8859-1 X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 22 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1362411893 news.xs4all.nl 6980 [2001:888:2000:d::a6]:32957 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:40458 On Tue, Mar 5, 2013 at 2:35 AM, Tomas Kotal wrote: > Seems like I found the problem: os._exit probably takes as parametr unsigned char, so it uses as error code whatever value it gets modulo 256: > > os._exit(1) # process.exitcode == 1 > os._exit(255) # process.exitcode == 255 > os._exit(256) # process.exitcode == 0 > os._exit(257) # process.exitcode == 1 > os._exit(32512) # process.exitcode == 0 > > So on Linux it's necesary to call something like this: > os._exit( os.system(cmd) >> 8 ) > > Because the first byte of return value on Linux is number of signal which kills the process and the second one is actual exit code. Yep. I had a reply part-written but you beat me to it! That is indeed what you need if you want to chain return values. However, why are you using os._exit? Check out the note here: http://docs.python.org/2/library/os.html#os._exit ChrisA