Linux 'sysinfo' function and 'struct sysinfo' type.
* src/alloc.c (Fmemory_info): New function.
* lisp/files.el (warn-maybe-out-of-memory): New function.
(find-file-noselect): Use it.
+2014-07-10 Dmitry Antipov <dmantipov@yandex.ru>
+
+ * configure.ac: Check whether sys/sysinfo.h provides
+ Linux 'sysinfo' function and 'struct sysinfo' type.
+
2014-06-28 Glenn Morris <rgm@gnu.org>
* configure.ac (lwlib_deps_frag, oldxmenu_deps_frag): New output files.
dnl checks for header files
AC_CHECK_HEADERS_ONCE(
sys/systeminfo.h
+ sys/sysinfo.h
coff.h pty.h
sys/resource.h
sys/utsname.h pwd.h utmp.h util.h)
[Define to 1 if personality LINUX32 can be set.])
fi
+if test "$ac_cv_header_sys_sysinfo_h" = yes; then
+ AC_MSG_CHECKING([if Linux sysinfo may be used])
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/sysinfo.h>]],
+ [[struct sysinfo si; sysinfo (&si)]])],
+ emacs_cv_linux_sysinfo=yes, emacs_cv_linux_sysinfo=no)
+ AC_MSG_RESULT($emacs_cv_linux_sysinfo)
+ if test $emacs_cv_linux_sysinfo = yes; then
+ AC_DEFINE([HAVE_LINUX_SYSINFO], 1, [Define to 1 if you have Linux sysinfo function.])
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/sysinfo.h>]],
+ [[struct sysinfo si; return si.mem_unit]])],
+ AC_DEFINE(LINUX_SYSINFO_UNIT, 1,
+ [Define to 1 if Linux sysinfo sizes are in multiples of mem_unit bytes.]))
+ fi
+fi
+
dnl On Solaris 8 there's a compilation warning for term.h because
dnl it doesn't define `bool'.
AC_CHECK_HEADERS(term.h, , , -)
+2014-07-10 Dmitry Antipov <dmantipov@yandex.ru>
+
+ * files.el (warn-maybe-out-of-memory): New function.
+ (find-file-noselect): Use it.
+
2014-07-09 Sam Steingold <sds@gnu.org>
* progmodes/cperl-mode.el (cperl-block-p): Treat the perl keyword
(file-size-human-readable size) op-type))))
(error "Aborted")))
+(defun warn-maybe-out-of-memory (size)
+ "Warn if an attempt to open file of SIZE bytes may run out of memory."
+ (let ((meminfo (memory-info)))
+ (when (consp meminfo)
+ (let ((total-free-memory (+ (nth 1 meminfo) (nth 3 meminfo))))
+ (when (and (not (zerop size))
+ (> (/ size 1024) total-free-memory))
+ (warn
+ "You are trying to open file which size (%s)
+exceeds an amount of available free memory (%s). If that
+fails, try to open it with `find-file-literally' (but note
+that some characters may be displayed incorrectly)."
+ (file-size-human-readable size)
+ (file-size-human-readable
+ (* (float total-free-memory) 1024))))))))
+
(defun find-file-noselect (filename &optional nowarn rawfile wildcards)
"Read file FILENAME into a buffer and return the buffer.
If a buffer exists visiting FILENAME, return that one, but
(setq buf other))))
;; Check to see if the file looks uncommonly large.
(when (not (or buf nowarn))
- (abort-if-file-too-large (nth 7 attributes) "open" filename))
+ (abort-if-file-too-large (nth 7 attributes) "open" filename)
+ (warn-maybe-out-of-memory (nth 7 attributes)))
(if buf
;; We are using an existing buffer.
(let (nonexistent)
(decode_coding_big5, decode_coding_charset, decode_coding)
(encode_coding): Adjust users.
+ * alloc.c (Fmemory_info): New function.
+
2014-07-09 Paul Eggert <eggert@cs.ucla.edu>
* syntax.c (back_comment): Use more-natural location for label.
#include <verify.h>
#include <execinfo.h> /* For backtrace. */
+#ifdef HAVE_LINUX_SYSINFO
+#include <sys/sysinfo.h>
+#endif
+
#if (defined ENABLE_CHECKING \
&& defined HAVE_VALGRIND_VALGRIND_H \
&& !defined USE_VALGRIND)
check_string_bytes (!noninteractive);
}
-\f
+DEFUN ("memory-info", Fmemory_info, Smemory_info, 0, 0, 0,
+ doc: /* Return a list of (TOTAL-RAM FREE-RAM TOTAL-SWAP FREE-SWAP).
+All values are in Kbytes. If there is no swap space, last two
+values are zero. If the system is not supported, return nil. */)
+ (void)
+{
+#ifdef HAVE_LINUX_SYSINFO
+ struct sysinfo si;
+ uintmax_t units;
+
+ if (sysinfo (&si))
+ emacs_abort ();
+#ifdef LINUX_SYSINFO_UNIT
+ units = si.mem_unit;
+#else
+ units = 1;
+#endif
+ return list4i ((uintmax_t) si.totalram * units / 1024,
+ (uintmax_t) si.freeram * units / 1024,
+ (uintmax_t) si.totalswap * units / 1024,
+ (uintmax_t) si.freeswap * units / 1024);
+#else /* not HAVE_LINUX_SYSINFO */
+ /* FIXME: add more systems. */
+ return Qnil;
+#endif /* HAVE_LINUX_SYSINFO */
+}
+
/* Debugging aids. */
DEFUN ("memory-limit", Fmemory_limit, Smemory_limit, 0, 0, 0,
defsubr (&Spurecopy);
defsubr (&Sgarbage_collect);
defsubr (&Smemory_limit);
+ defsubr (&Smemory_info);
defsubr (&Smemory_use_counts);
defsubr (&Ssuspicious_object);