Add a config option for abort() to shutdown the stdio subsystem. This is

mainly to cut down on noise in the NIST/PCTS tests since older POSIX
behavior was to fclose() (and hence fflush()) all open streams.

extra/Configs/Config.in

@@ -775,10 +775,11 @@ config UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS
 
 
 config UCLIBC_HAS_SCANF_GLIBC_A_FLAG
-	bool "Support glibc's 'a' flag for scanf string conversions"
+	bool "Support glibc's 'a' flag for scanf string conversions (not implemented)"
 	default n
 	help
 	  NOTE!!!  Currently Not Implemented!!! Just A Place Holder!!  NOTE!!!
+	  NOTE!!!  Conflicts with an ANSI/ISO C99 scanf flag!!         NOTE!!!
 
 	  Answer Y to enable support for glibc's 'a' flag for the scanf string
 	  conversions '%s', '%[', '%ls', '%l[', and '%S'.  This is used to
@@ -851,6 +852,16 @@ config UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8
 
 endchoice
 
+config UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT
+	bool "Attemt to shutdown stdio subsystem when abort() is called."
+	default n
+	help
+	  ANSI/ISO C99 requires abort() to be asyn-signal-safe.  So there was a behavioral
+	  change made in SUSv3.  Previously, abort() was required to have the affect of
+	  fclose() on all open streams.  The wording has been changed to "may" from "shall".
+
+	  Most people will answer N.
+
 config UCLIBC_HAS_STDIO_GETC_MACRO
 	bool "Provide a macro version of getc()"
 	depends !UCLIBC_HAS_STDIO_BUFSIZ_NONE

libc/stdlib/abort.c

@@ -63,6 +63,9 @@ Cambridge, MA 02139, USA.  */
 #warning no abort instruction define for your arch
 #endif
 
+#ifdef __UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT__
+extern void weak_function _stdio_term(void);
+#endif
 extern void _exit __P((int __status)) __attribute__ ((__noreturn__));
 static int been_there_done_that = 0;
 
@@ -95,6 +98,17 @@ void abort(void)
 		/* Try to suicide with a SIGABRT */
 		if (been_there_done_that == 0) {
 			been_there_done_that++;
+
+#ifdef __UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT__
+			/* If we are using stdio, try to shut it down.  At the very least,
+			 * this will attemt to commit all buffered writes.  It may also
+			 * unboffer all writable files, or close them outright.
+			 * Check the stdio routines for details. */
+			if (_stdio_term) {
+				_stdio_term();
+			}
+#endif
+
 abort_it:
 			UNLOCK;
 			raise(SIGABRT);