Path: csiph.com!3.us.feeder.erje.net!feeder.erje.net!news.linkpendium.com!news.linkpendium.com!panix!usenet.stanford.edu!not-for-mail From: Chet Ramey Newsgroups: gnu.bash.bug Subject: Re: syntax errors produced by interaction between process substitution and a SIGCHLD trap Date: Thu, 19 Sep 2019 10:37:45 -0400 Lines: 31 Approved: bug-bash@gnu.org Message-ID: References: <84887b03-1923-41f2-baba-09bfd82509f0@case.edu> Reply-To: chet.ramey@case.edu NNTP-Posting-Host: lists.gnu.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Trace: usenet.stanford.edu 1568904334 1448 209.51.188.17 (19 Sep 2019 14:45:34 GMT) X-Complaints-To: action@cs.stanford.edu Cc: chet.ramey@case.edu To: Travis Everett , bug-bash@gnu.org Envelope-to: bug-bash@gnu.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=case.edu; s=smtp-primary; t=1568903870; bh=kBtDGipbXwqbkGIo2N35/0PaLBy+rqbcgXm7/LX8aII=; h=Reply-To:Cc:Subject:To:References:From:Message-ID:Date: MIME-Version:In-Reply-To:Content-Type:Content-Transfer-Encoding; 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Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 In-Reply-To: Content-Language: en-US X-Junkmail-Status: score=7/90, host=mpv3-2015.case.edu X-Junkmail-PrAS-Raw: score=7/90, refid=2.7.2:2019.9.19.134817:17:7.944, ip=, rules=DKIM_SIGNATURE, __HAS_REPLYTO, __HAS_CC_HDR, __SUBJ_REPLY, __PHISH_SPEAR_SUBJ_ALERT, __BOUNCE_CHALLENGE_SUBJ, __BOUNCE_NDR_SUBJ_EXEMPT, __SUBJ_ALPHA_END, __TO_MALFORMED_2, __TO_NAME, __TO_NAME_DIFF_FROM_ACC, __HAS_REFERENCES, __REFERENCES, __HAS_FROM, FROM_EDU_TLD, __HAS_MSGID, __SANE_MSGID, DATE_TZ_NA, __USER_AGENT, __MOZILLA_USER_AGENT, __MIME_VERSION, __IN_REP_TO, __CT, __CT_TEXT_PLAIN, __CTE, __REPLYTO_SAMEAS_FROM_ADDY, __REPLYTO_SAMEAS_FROM_ACC, __FROM_DOMAIN_IN_ANY_CC1, __FROM_DOMAIN_IN_ANY_CC2, __REPLYTO_SAMEAS_FROM_DOMAIN, __DKIM_ALIGNS_1, __DKIM_ALIGNS_2, __ANY_URI, __URI_WITH_PATH, __URI_NO_WWW, __CP_URI_IN_BODY, __FRAUD_MONEY_CURRENCY_DOLLAR, __SUBJ_ALPHA_NEGATE, __URI_IN_BODY, __URI_NOT_IMG, __FORWARDED_MSG, __BODY_NO_MAILTO, __NO_HTML_TAG_RAW, BODYTEXTP_SIZE_3000_LESS, BODY_SIZE_1000_1099, __MIME_TEXT_P1, __MIME_TEXT_ONLY, __URI_NS, [TRUNCATED], so=2010-03-03 19:42:08, dmn=2016-08-03-0138 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] X-Received-From: 129.22.103.194 X-BeenThere: bug-bash@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Bug reports for the GNU Bourne Again SHell List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Mailman-Original-Message-ID: <84887b03-1923-41f2-baba-09bfd82509f0@case.edu> X-Mailman-Original-References: Xref: csiph.com gnu.bash.bug:15379 On 7/31/19 2:35 PM, Travis Everett wrote: > Bash Version: 5.0 > Patch Level: 7 > Release Status: release > > Description: > I stumbled into an odd interaction between process substitution and > a SIGCHLD trap that causes syntax errors in otherwise valid commands. > > I managed to pare this down to a very minimal reproduction. I also > included a more realistic command at the end just in case I'm mistaken > about the minimal reproduction showing exactly the same issue. Thanks for the report. This will be fixed in the next devel branch push. > > I see the same behavior in bash 4.4.23(1)-release and do *not* see > it in the macos system bash 3.2.57(1)-release. That's the result of implementing the POSIX requirement of parsing the contents of $(...) command substitutions, which happened between bash-3.2 and bash-4.0. Chet -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, UTech, CWRU chet@case.edu http://tiswww.cwru.edu/~chet/