2014-08-18 Joel Sherrill <joel.sherrill@oarcorp.com>

    * libc/include/sys/signal.h: Add sigaltstack() support.
2014-08-18 Joel Sherrill <joel.sherrill@oarcorp.com>

	* libc/include/string.h: Improve language and OS standard guards.
2014-08-18  Jeff Johnston  <jjohnstn@redhat.com>

        * libc/include/sys/config.h[__m68k__]: Set _READ_WRITE_RETURN_TYPE
        to _ssize_t to match underlying code in libgloss.
	* libc/include/sys/signal.h: Declare sigaltstack for RTEMS only.