21.2 Showstopper? Warning: BAD DATA LOSS on disk full

I've discovered that in this XEmacs, if a file is truncated due to lack of disk space on write, XEmacs blithely goes ahead and renames the tmp file and does whatever it usually does (including remove) to the previous version. Verified with rm test; touch test # dunno if this is needed /playpen/src/Builds/XEmacs-21.2/src/xemacs -no-autoloads C-x C-f test C-x i file-bigger-than-available-space C-x C-s C-x C-x and df says no remaining space, and diff says test == head(file-bigger-than-available-space). This is not a problem of the OS (Linux 2.2.18pre2, Debian unstable, glibc 2.2.1 (Debian rev 1)) per se AFAICT; cp fills up the partition, as expected, but then gives an error return. Gotta go back and grade entrance exams, will investigate further later, but this is a bad one. Have no idea when this happened, I'd been using 21.1 for mail & stuff until this install, and havn't seen disk full in my devel directories for many months. Approx. 21.2.42, CVS current as of approximately Jan 28 9:00 UTC. uname -a: Linux turnbull 2.2.18pre2 #1 Mon Sep 4 19:28:49 JST 2000 i586 unknown /coda/Projects/XEmacs/21.2-HEAD/configure '--srcdir=/coda/Projects/XEmacs/21.2-HEAD' '--prefix=/playpen/gnu' '--exec-prefix=/playpen/gnu/plat' '--with-mule' '--with-xim=xlib' '--with-xfs' XEmacs 21.2-b42 "Poseidon" configured for `i586-pc-linux'. Compilation / Installation: Source code location: /coda/Projects/XEmacs/21.2-HEAD Installation prefix: /playpen/gnu Operating system description file: `s/linux.h' Machine description file: `m/intel386.h' Compiler: gcc -g -O3 -Wall -Wno-switch -Wpointer-arith -Winline -Wmissing-prototypes -Wshadow 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/Xaw - Athena library to link: Xaw 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. Compiling in support for X-Face message headers. Sound: Compiling in support for sound (native). Databases: Compiling in support for Berkeley database. 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. Mail: Compiling in support for "dot-locking" mail spool file locking method. Other Features: Compiling in support for dynamic shared object modules. Compiling in support for extra debugging code. WARNING: --------------------------------------------------------- WARNING: Compiling in support for runtime error checking. WARNING: XEmacs will run noticeably more slowly as a result. WARNING: Error checking is on by default for XEmacs beta releases. WARNING: --------------------------------------------------------- -- University of Tsukuba Tennodai 1-1-1 Tsukuba 305-8573 JAPAN Institute of Policy and Planning Sciences Tel/fax: +81 (298) 53-5091 _________________ _________________ _________________ _________________ What are those straight lines for? "XEmacs rules."