[newlib-cygwin] Synchronize <sys/time.h> with FreeBSD

[Sebastian Huber <sh@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=aae831b083ab762726bfb2c07584a481e6925b81

commit aae831b083ab762726bfb2c07584a481e6925b81
Author: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date:   Mon Sep 23 12:02:11 2019 +0200

    Synchronize <sys/time.h> with FreeBSD
    
    This change is based on the FreeBSD commit:
    
    Author: asomers <asomers@FreeBSD.org>
    Date:   Mon Jul 30 15:46:40 2018 +0000
    
        Make timespecadd(3) and friends public
    
        The timespecadd(3) family of macros were imported from NetBSD back in
        r35029. However, they were initially guarded by #ifdef _KERNEL. In the
        meantime, we have grown at least 28 syscalls that use timespecs in some
        way, leading many programs both inside and outside of the base system to
        redefine those macros. It's better just to make the definitions public.
    
        Our kernel currently defines two-argument versions of timespecadd and
        timespecsub.  NetBSD, OpenBSD, and FreeDesktop.org's libbsd, however, define
        three-argument versions.  Solaris also defines a three-argument version, but
        only in its kernel.  This revision changes our definition to match the
        common three-argument version.
    
        Bump _FreeBSD_version due to the breaking KPI change.
    
        Discussed with: cem, jilles, ian, bde
        Differential Revision:  https://reviews.freebsd.org/D14725

Diff:
---
 newlib/libc/include/sys/time.h | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/newlib/libc/include/sys/time.h b/newlib/libc/include/sys/time.h
index 103f566..370c134 100644
--- a/newlib/libc/include/sys/time.h
+++ b/newlib/libc/include/sys/time.h
@@ -340,6 +340,33 @@ tvtosbt(struct timeval _tv)
 
 	return (((sbintime_t)_tv.tv_sec << 32) + ustosbt(_tv.tv_usec));
 }
+
+/* Operations on timespecs */
+#define	timespecclear(tvp)	((tvp)->tv_sec = (tvp)->tv_nsec = 0)
+#define	timespecisset(tvp)	((tvp)->tv_sec || (tvp)->tv_nsec)
+#define	timespeccmp(tvp, uvp, cmp)					\
+	(((tvp)->tv_sec == (uvp)->tv_sec) ?				\
+	    ((tvp)->tv_nsec cmp (uvp)->tv_nsec) :			\
+	    ((tvp)->tv_sec cmp (uvp)->tv_sec))
+
+#define	timespecadd(tsp, usp, vsp)					\
+	do {								\
+		(vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec;		\
+		(vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec;	\
+		if ((vsp)->tv_nsec >= 1000000000L) {			\
+			(vsp)->tv_sec++;				\
+			(vsp)->tv_nsec -= 1000000000L;			\
+		}							\
+	} while (0)
+#define	timespecsub(tsp, usp, vsp)					\
+	do {								\
+		(vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec;		\
+		(vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec;	\
+		if ((vsp)->tv_nsec < 0) {				\
+			(vsp)->tv_sec--;				\
+			(vsp)->tv_nsec += 1000000000L;			\
+		}							\
+	} while (0)
 #endif /* __BSD_VISIBLE */
 
 /*