* emacs.c (shut_down_emacs): Don't assume stderr is buffered,

or that fprintf is async-signal-safe.  POSIX doesn't require
either assumption.

src/ChangeLog

+2012-09-22  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* emacs.c (shut_down_emacs): Don't assume stderr is buffered,
+	or that fprintf is async-signal-safe.  POSIX doesn't require
+	either assumption.
+
 2012-09-22  Chong Yidong  <cyd@gnu.org>
 	* buffer.c (Fset_buffer_modified_p): Handle indirect buffers

src/emacs.c

@@ -27,6 +27,8 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <sys/file.h>
 #include <unistd.h>
 
+#include <ignore-value.h>
+
 #include "lisp.h"
 
 #ifdef HAVE_WINDOW_SYSTEM
@@ -2012,7 +2014,12 @@ shut_down_emacs (int sig, Lisp_Object stuff)
       {
 	reset_all_sys_modes ();
 	if (sig && sig != SIGTERM)
-	  fprintf (stderr, "Fatal error %d: %s", sig, strsignal (sig));
+	  {
+	    char buf[100];
+	    int buflen = snprintf (buf, sizeof buf, "Fatal error %d: %s",
+				   sig, strsignal (sig));
+	    ignore_value (write (STDERR_FILENO, buf, buflen));
+	  }
       }
   }
 #else