[Bug: 21.4.14] unix_send_process can fail to flush last chunk

Dear Bug Team! We noticed this problem after upgrading to JDEE 2.3.4. The symptom was that JDE's (jde-open-class-at-point) function would hang for 30 seconds, then show the target file in a state only partially processed by JDE. Tracing the JDE reveals that the hang is in its (bsh-eval) function, which calls (process-send-string), then awaits a reply using (accept-process-output) with a 30-second timeout. The string it's sending is rather long: about 5000 bytes consisting of a single beanshell command to tell the inferior bsh about project settings. There is only one newline at the end. Having been supposedly sent this string by (process-send-string), the beanshell has not replied after 30 seconds. In JDEE 2.3.4, communication with the bsh is over pipes: it binds (process-connection-type nil) when starting the inferior process. (JDE 2.3.2 did not do this, so it communicated using ptys instead.) The output pipe from xemacs to the inferior bsh is in non-blocking mode, apparently as of -r1.50 of process-unix.c. Adding a bit of tracing to process-unix.c:unix_send_process() and running under strace revealed a problem with the handling of EAGAIN on the output pipe. For this particular combination of circumstances (sending a string of just the right length to a slowish inferior process), it is only the write(2) system call under the final last-gasp Lstream_flush() in unix_send_process() that fails with EAGAIN. All the earlier writes succeeded, so the flushing loop guarded by Lstream_was_blocked_p() was never entered. The upshot is that the final 431-byte chunk of the string remains queued. The inferior bsh never sees the newline, so it never executes the command, and never sends the reply that (accept-process-output) is waiting for. The patch attached arranges that the last chunk of the string is always flushed through the DATA_OUTSTREAM _before_ the Lstream_was_blocked_p() loop, so that that loop can ensure it does actually get written. I've retained the existing last-gasp Lstream_flush() on the assumption that part of its function is to clear the _input_ side of the p->coding_outstream etc., even in the case that we longjmp() out of the SIGPIPE handler. Someone more familiar with the code may well be able to achieve the effect of this patch more cleanly. With this patch, our JDE hang goes away. The patch does not seem to break communications over ptys either (tested by going back to JDE 2.3.2). Although this patch is against XEmacs 21.4.14 from Fedora Core 1, the bug seems to be present in all newer versions I can see in CVS. Cheers, ---- Dave -- David Evers Applied Generics Ltd Tel: +44 870 240 3694 Pentlands Science Park Fax: +44 870 706 5818 Bush Loan, Penicuik EH26 0PZ http://www.appliedgenerics.com United Kingdom. ================================================================ System Info to help track down your bug: --------------------------------------- uname -a: Linux bugs.devel.redhat.com 2.4.21-2.ELsmp #1 SMP Wed Sep 17 15:00:55 EDT 2003 i686 i686 i386 GNU/Linux ./configure 'i386-redhat-linux-gnu' '--prefix=/usr' '--exec-prefix=/usr' '--bindir=/usr/bin' '--datadir=/usr/share' '--libdir=/usr/lib' '--mandir=/usr/share/man/man1' '--infodir=/usr/share/info' '--with-gpm=no' '--with-sound=native' '--with-pop' '--mail-locking=lockf' '--with-clash-detection' '--debug=yes' '--with-mule=yes' '--with-database=berkdb' '--with-ldap=yes' '--with-hesiod=no' '--with-canna=yes' '--with-wnn=yes' '--with-xim=xlib' '--with-athena=3d' '--with-widgets=athena' '--with-menubars=lucid' '--with-scrollbars=lucid' '--with-dialogs=athena' '--with-msw=no' '--with-xfs=yes' '--pdump' XEmacs 21.4.14 "Reasonable Discussion" configured for `i386-redhat-linux'. Compilation / Installation: Source code location: /usr/src/build/320173-i386/BUILD/xemacs-21.4.14 Installation prefix: /usr Operating system description file: `s/linux.h' Machine description file: `m/intel386.h' Compiler: gcc -O2 -g -pipe -march=i386 -mcpu=i686 Relocating allocator for buffers: no GNU version of malloc: yes - Using Doug Lea's new malloc from the GNU C Library. Window System: Compiling in support for the X window system: - X Windows headers location: /usr/X11R6/include - X Windows libraries location: /usr/X11R6/lib - Handling WM_COMMAND properly. Compiling in support for the Athena widget set: - Athena headers location: X11/Xaw3d - Athena library to link: Xaw3d Using Lucid menubars. Using Lucid scrollbars. Using Athena dialog boxes. Using Athena native widgets. TTY: Compiling in support for ncurses. Images: Compiling in support for GIF images (builtin). Compiling in support for XPM images. Compiling in support for PNG images. Compiling in support for JPEG images. Compiling in support for TIFF images. Sound: Compiling in support for sound (native). Databases: Compiling in support for Berkeley database. Compiling in support for LDAP. Compiling in support for PostgreSQL. - Using PostgreSQL header file: libpq-fe.h - Using PostgreSQL V7 bindings. Internationalization: Compiling in support for Mule (multi-lingual Emacs). Compiling in support for XIM (X11R5+ I18N input method). - Using raw Xlib to provide XIM support. - Using XFontSet to provide bilingual menubar. Compiling in support for Canna on Mule. Compiling in support for the WNN input method on Mule. Mail: Compiling in support for POP mail retrieval. Compiling in support for "lockf" mail spool file locking method. Other Features: Inhibiting IPv6 canonicalization at startup. Compiling in support for dynamic shared object modules. Using the new portable dumper. Compiling in support for extra debugging code. 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:version 0.13 :type regular) (ecb :version 1.12 :type regular) (docbookide :version 0.06 :type regular) (dired :version 1.14 :type regular) (dictionary :version 1.12 :type regular) (debug :version 1.16 :type regular) (crisp :version 1.13 :type regular) (cookie :version 1.14 :type regular) (clearcase :version 1.06 :type regular) (cc-mode :version 1.4 :type regular) (calendar :version 1.21 :type regular) (calc :version 1.23 :type regular) (c-support :version 1.17 :type single-file) (build :version 1.1 :type regular) (bbdb :version 1.23 :type regular) (auctex :version 1.35 :type regular) (ada :version 1.13 :type regular) (mule-ucs :version 1.04 :type regular) (mule-base :version 1.43 :type regular) (lookup :version 1.13 :type regular) (locale :version 1.2 :type regular) (leim :version 1.21 :type regular) (latin-unity :version 1.07 :type regular) (egg-its :version 1.26 :type regular) (edict :version 1.15 :type regular)) Installed Modules: ----------------- Features: -------- (mail-abbrevs xemacsbug shadow sendmail rfc822 lazy-shot vm-autoload vm-vars highlight-headers vm-startup vm-version vm sh-script skeleton mbutton-diffto vc vc-hooks rbutton-isearch p4 goto-addr pcl-cvs diff-mode pcl-cvs-parse pcl-cvs-info pcl-cvs-defs pcl-cvs-util cvs-compat dired-faces dired-xemacs dired cookie dll jdok jde tags etags jde-open-source jde-class jde-parse-class jde-xemacs efc-xemacs debug-toolbar jde-import jde-java-font-lock byte-optimize bytecomp byte-compile jde-java-grammar jde-which-method senator hippie-exp jde-wiz jde-complete eldoc jde-plugins executable browse-url jde-gen tempo jde-jdb jde-bug jde-dbs jde-run jde-dbo regress jde-db overlay jde-parse sregex jde-imenu semantic-imenu semantic-java thingatpt avltree stack-m elib-node semantic-sb jde-compile compile cus-edit cus-load cc-mode cc-fonts cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs jde-help jde-widgets tree-widget beanshell comint ring jde-custom jde-project-file jde-autoload jde-util efc mwheel gnuserv lazy-lock paren blink-paren jka-compr uniquify align cedet cedet-contrib-load speedbar-load semantic-load semantic-idle timer semantic-util-modes semantic-decorate semantic-util semanticdb-el eieio-opt semantic-ia-sb semantic-analyze semantic-ctxt semantic-format font-lock semantic-cb eieio-speedbar eieio-custom wid-edit semantic-sort semanticdb-find speedbar cus-face imenu sb-image ezimage dframe semanticdb-search semantic-find semanticdb eieio-base eieio eieio-comp semantic pp semantic-lex semantic-tag assoc working semantic-fw mode-local regexp-opt advice advice-preload eieio-load ede-load cogre-load cedet-load inversion zenirc-autoloads xslt-process-autoloads xslide-autoloads xemacs-devel-autoloads xemacs-base-autoloads x-symbol-autoloads w3-autoloads vm-autoloads viper-autoloads view-process-autoloads vhdl-autoloads vc-cc-autoloads vc-autoloads tramp-autoloads tpu-autoloads tooltalk-autoloads tm-autoloads time-autoloads textools-autoloads text-modes-autoloads texinfo-autoloads supercite-autoloads strokes-autoloads speedbar-autoloads sounds-wav-autoloads sounds-au-autoloads sml-mode-autoloads slider-autoloads sieve-autoloads sh-script-autoloads sgml-autoloads semantic-autoloads scheme-autoloads sasl-autoloads ruby-modes-autoloads rmail-autoloads reftex-autoloads python-modes-autoloads psgml-dtds-autoloads psgml-autoloads ps-print-autoloads prog-modes-autoloads pgg-autoloads perl-modes-autoloads pcomplete-autoloads pcl-cvs-autoloads pc-autoloads os-utils-autoloads oo-browser-autoloads ocaml-autoloads net-utils-autoloads mmm-mode-autoloads misc-games-autoloads mine-autoloads mh-e-autoloads mailcrypt-autoloads mail-lib-autoloads liece-autoloads jde-autoloads ispell-autoloads ilisp-autoloads igrep-autoloads idlwave-autoloads ibuffer-autoloads hyperbole-autoloads hm--html-menus-autoloads haskell-mode-autoloads gnus-autoloads gnats-autoloads games-autoloads fsf-compat-autoloads frame-icon-autoloads fortran-modes-autoloads forms-autoloads footnote-autoloads eudc-autoloads eterm-autoloads ess-autoloads eshell-autoloads emerge-autoloads elib-autoloads eieio-autoloads efs-autoloads edt-autoloads edit-utils-autoloads ediff-autoloads edebug-autoloads ecrypto-autoloads ecb-autoloads docbookide-autoloads dired-autoloads dictionary-autoloads debug-autoloads crisp-autoloads cookie-autoloads clearcase-autoloads cc-mode-autoloads calendar-autoloads calc-autoloads c-support-autoloads build-autoloads bbdb-autoloads auctex-autoloads apel-autoloads ada-autoloads mule-ucs-autoloads mule-base-autoloads lookup-autoloads locale-autoloads leim-autoloads latin-unity-autoloads egg-its-autoloads edict-autoloads lisp-autoloads loadhist auto-show fontl-hooks x-iso8859-1 canna-leim slovenian czech romanian ccl mule-help code-cmds gutter-items menubar-items x-menubar mode-motion mouse itimer auto-save lisp-mode easymenu iso8859-1 page buff-menu lib-complete cus-file derived frame text-props obsolete cus-start custom widget cl-extra mini-cl cl cl-19 packages backquote very-early-lisp postgresqlv7 postgresql CANNA file-coding wnn mule lucid-scrollbars cut-buffer lucid-menubars athena-dialogs x c-balloon-help tty-frames tty toolbar native-sound scrollbar unix-processes multicast network-streams subprocesses modules menu-accelerator-support menubar berkeley-db md5 xemacs xim gutter tiff png gif jpeg xpm xbm lisp-float-type linux dialog devices window-system base64) Recent keystrokes: ----------------- M-x r e p o r t - x e TAB RET Recent messages (most recent first): ----------------------------------- Loading xemacsbug...done Loading xemacsbug... Loading mwheel...done Loading mwheel... Loading ~/.emacs.gnu.custom...done Loading lazy-shot...done Loading lazy-shot... Loading ~/.emacs.gnu.custom... Loading dired-mule...done Loading dired-mule... Loading byte-optimize...done Loading byte-optimize... Loading bytecomp...done Loading bytecomp... Loading /homes/dme/jde-java-font-lock.api.xemacs-21.apicache...done Loading /homes/dme/jde-java-font-lock.api.xemacs-21.apicache... Loading customization dependencies...done Loading customization dependencies... generic-x not found Loading gnuserv...done