[newlib-cygwin] Feature test macros overhaul: unistd.h, part 2

[Yaakov Selkowitz <yselkowitz@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=e4ee6c9aaf82ee8a7c0479dda05b7d2c5b46e8ef

commit e4ee6c9aaf82ee8a7c0479dda05b7d2c5b46e8ef
Author: Yaakov Selkowitz <yselkowi@redhat.com>
Date:   Thu Jun 29 13:45:46 2017 -0500

    Feature test macros overhaul: unistd.h, part 2
    
    This fixes commit f70aad3de4d845f8b720010a2f8817db842d81e8 as well as some
    other functions which were never properly guarded.
    
    Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>

Diff:
---
 newlib/libc/include/sys/unistd.h | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/newlib/libc/include/sys/unistd.h b/newlib/libc/include/sys/unistd.h
index 859671a..75f8a51 100644
--- a/newlib/libc/include/sys/unistd.h
+++ b/newlib/libc/include/sys/unistd.h
@@ -207,15 +207,21 @@ int     _EXFUN(setuid, (uid_t __uid ));
 void	_EXFUN(setusershell, (void));
 #endif
 unsigned _EXFUN(sleep, (unsigned int __seconds ));
+#if __XSI_VISIBLE
 void    _EXFUN(swab, (const void *__restrict, void *__restrict, ssize_t));
+#endif
 long    _EXFUN(sysconf, (int __name ));
 pid_t   _EXFUN(tcgetpgrp, (int __fildes ));
 int     _EXFUN(tcsetpgrp, (int __fildes, pid_t __pgrp_id ));
 char *  _EXFUN(ttyname, (int __fildes ));
 int     _EXFUN(ttyname_r, (int, char *, size_t));
 int     _EXFUN(unlink, (const char *__path ));
+#if __XSI_VISIBLE >= 500 && __POSIX_VISIBLE < 200809 || __BSD_VISIBLE
 int 	_EXFUN(usleep, (useconds_t __useconds));
+#endif
+#if __BSD_VISIBLE
 int     _EXFUN(vhangup, (void ));
+#endif
 _READ_WRITE_RETURN_TYPE _EXFUN(write, (int __fd, const void *__buf, size_t __nbyte ));
 
 #ifdef __CYGWIN__
@@ -252,27 +258,34 @@ _READ_WRITE_RETURN_TYPE _EXFUN(_write, (int __fd, const void *__buf, size_t __nb
 int     _EXFUN(_execve, (const char *__path, char * const __argv[], char * const __envp[] ));
 #endif
 
-#if defined(__CYGWIN__) || defined(__rtems__) || defined(__aarch64__) || defined (__arm__) || defined(__sh__) || defined(__SPU__)
 #if !defined(__INSIDE_CYGWIN__)
+#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE >= 500
 int     _EXFUN(ftruncate, (int __fd, off_t __length));
+#endif
+#if __POSIX_VISIBLE >= 200809 || __XSI_VISIBLE >= 500
 int     _EXFUN(truncate, (const char *, off_t __length));
 #endif
 #endif
 
-#if defined(__BSD_VISIBLE) || (__XSI_VISIBLE >= 500)
+#if __BSD_VISIBLE || __POSIX_VISIBLE < 200112
 int	_EXFUN(getdtablesize, (void));
+#endif
+#if __BSD_VISIBLE || __POSIX_VISIBLE >= 200809 || __XSI_VISIBLE >= 500
 useconds_t _EXFUN(ualarm, (useconds_t __useconds, useconds_t __interval));
+#endif
+
+#if __BSD_VISIBLE || __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE >= 500
 #if !(defined  (_WINSOCK_H) || defined (_WINSOCKAPI_) || defined (__USE_W32_SOCKETS))
 /* winsock[2].h defines as __stdcall, and with int as 2nd arg */
  int	_EXFUN(gethostname, (char *__name, size_t __len));
 #endif
 #endif
 
-#if defined(__CYGWIN__) || defined(__rtems__)
+#if __MISC_VISIBLE
 int	_EXFUN(setdtablesize, (int));
 #endif
 
-#if defined(__CYGWIN__) || defined(__SPU__) || defined(__rtems__)
+#if __BSD_VISIBLE || __XSI_VISIBLE >= 500
 void    _EXFUN(sync, (void));
 #endif