From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Henrik Grimler Newsgroups: gmane.emacs.bugs Subject: bug#47596: File descriptor error when exiting emacs on android 11 Date: Mon, 05 Apr 2021 10:14:10 +0200 Message-ID: <191e2295b88384adf0e7cc1e3dc84cf8f37eb973.camel@grimler.se> References: <83im51deye.fsf@gnu.org> <730dad3a54f0f53b22e9603879e949b60f5b2c00.camel@grimler.se> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="24414"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Evolution 3.38.4 Cc: 47596@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Apr 05 10:15:11 2021 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lTKO6-0006Ej-2Z for geb-bug-gnu-emacs@m.gmane-mx.org; 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bh=lmS1AS4xpM7AxOPttqEKoGWimx6FIoKw36szMqycq3k=; b=g+ss6j5G40vSA6tTgsAiHTnvMR KSQ7BK+RpwQI9EttJxSMyKjmuwXkxiAl7atPOuLNpCNY1QNgvettvuQIU86PHqJmsQPtiBdQv1MT2 TcmLpz4yto4NBlORfcoUKLIgFSgiDpdmg6EfJRnl2TsiH6Hl37I+EnYo4u2ziA8RkdX8hNMn1x5Dg 03YxehBJzUsEkngGzN7DOBrpfSYv220abBWu/dqqCKyGasTA/NGh0auJ5fRldP81NgB7dbnP4w9o6 Y8NKjVvH7nvU0+LAsemEuygjgF+3ctBYOLl6Hit2lnrIgDy2B8MStkr2BEWTD5dcxkAcDVabqr29W BrpKyL5w==; In-Reply-To: <730dad3a54f0f53b22e9603879e949b60f5b2c00.camel@grimler.se> X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - cpsrv07.misshosting.com X-AntiAbuse: Original Domain - debbugs.gnu.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - grimler.se X-Get-Message-Sender-Via: cpsrv07.misshosting.com: authenticated_id: henrik@grimler.se X-Authenticated-Sender: cpsrv07.misshosting.com: henrik@grimler.se X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:203582 Archived-At: Hi, Compiling this, on any optimisation level, is enough to trigger the error: ``` #include int main() { fdopen (2, "w"); fclose (stderr); } ``` In emacs fdopen is run in init_standard_fds, where we have ``` [...] force_open (STDERR_FILENO, O_RDONLY); /* Set buferr if possible on platforms defining _PC_PIPE_BUF, as they support the notion of atomic writes to pipes. */ #ifdef _PC_PIPE_BUF buferr = fdopen (STDERR_FILENO, "w"); if (buferr) setvbuf (buferr, NULL, _IOLBF, 0); #endif } ``` so I suppose there is either some very fundamental issue with  `fdopen (STDERR_FILENO, "w")` here, or the file descriptor sanitizer on android is broken. If I avoid that part of init_standard_fds, i.e. change the ifdef to something like `#if defined(_PC_PIPE_BUF) && !defined(__ANDROID__)`, I get an emacs that seem to fully work on android. Best regards, Henrik Grimler