2 files changed, 73 insertions, 22 deletions
diff --git a/share/man/man3/Makefile b/share/man/man3/Makefile
index 19e65986edbc..6197b0affb4d 100644
--- a/share/man/man3/Makefile
+++ b/share/man/man3/Makefile
@@ -164,7 +164,12 @@ MLINKS+=	stdarg.3 va_arg.3 \
 MLINKS+=	timeradd.3 timerclear.3 \
 		timeradd.3 timercmp.3 \
 		timeradd.3 timerisset.3 \
-		timeradd.3 timersub.3
+		timeradd.3 timersub.3 \
+		timeradd.3 timespecadd.3 \
+		timeradd.3 timespecsub.3 \
+		timeradd.3 timespecclear.3 \
+		timeradd.3 timespecisset.3 \
+		timeradd.3 timespeccmp.3
 MLINKS+=	tree.3 RB_EMPTY.3 \
 		tree.3 RB_ENTRY.3 \
 		tree.3 RB_FIND.3 \
diff --git a/share/man/man3/timeradd.3 b/share/man/man3/timeradd.3
index 7b6293f0dbfb..86e6b2816f1f 100644
--- a/share/man/man3/timeradd.3
+++ b/share/man/man3/timeradd.3
@@ -27,7 +27,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd August 11, 1999
+.Dd July 30, 2018
 .Dt TIMERADD 3
 .Os
 .Sh NAME
@@ -35,8 +35,13 @@
 .Nm timersub ,
 .Nm timerclear ,
 .Nm timerisset ,
-.Nm timercmp
-.Nd operations on timevals
+.Nm timercmp ,
+.Nm timespecadd ,
+.Nm timespecsub ,
+.Nm timespecclear ,
+.Nm timespecisset ,
+.Nm timespeccmp
+.Nd operations on timevals and timespecs
 .Sh SYNOPSIS
 .In sys/time.h
 .Ft void
@@ -49,15 +54,31 @@
 .Fn timerisset "struct timeval *tvp"
 .Ft int
 .Fn timercmp "struct timeval *a" "struct timeval *b" CMP
+.Ft void
+.Fn timespecadd "struct timespec *a" "struct timespec *b" "struct timespec *res"
+.Ft void
+.Fn timespecsub "struct timespec *a" "struct timespec *b" "struct timespec *res"
+.Ft void
+.Fn timespecclear "struct timespec *ts"
+.Ft int
+.Fn timespecisset "struct timespec *ts"
+.Ft int
+.Fn timespeccmp "struct timespec *a" "struct timespec *b" CMP
 .Sh DESCRIPTION
 These macros are provided for manipulating
 .Fa timeval
+and
+.Fa timespec
 structures for use with the
+.Xr clock_gettime 2 ,
+.Xr clock_settime 2 ,
 .Xr gettimeofday 2
 and
 .Xr settimeofday 2
 calls.
-The structure is defined in
+The
+.Fa timeval
+structure is defined in
 .In sys/time.h
 as:
 .Bd -literal
@@ -66,50 +87,67 @@ struct timeval {
 	long	tv_usec;	/* and microseconds */
 };
 .Ed
+And the
+.Fa timespec
+structure is defined in
+.In time.h
+as:
+.Bd -literal
+struct timespec {
+	time_t tv_nsec;		/* seconds */
+	long   tv_nsec;		/* and nanoseconds */
+};
+.Ed
 .Pp
 .Fn timeradd
-adds the time information stored in
+and
+.Fn timespecadd
+add the time information stored in
 .Fa a
 to
 .Fa b
-and stores the resulting
-.Vt timeval
-in
+and store the result in
 .Fa res .
 The results are simplified such that the value of
 .Fa res->tv_usec
-is always less than 1,000,000 (1 second).
+or
+.Fa res->tv_nsec
+is always less than 1 second.
 .Pp
 .Fn timersub
-subtracts the time information stored in
+and
+.Fn timespecsub
+subtract the time information stored in
 .Fa b
 from
 .Fa a
-and stores the resulting
-.Vt timeval
+and store the result
 in
 .Fa res .
 .Pp
 .Fn timerclear
-initializes
-.Fa tvp
-to midnight (0 hour) January 1st, 1970 (the Epoch).
+and
+.Fn timespecclear
+initialize their argument to midnight (0 hour) January 1st, 1970 (the Epoch).
 .Pp
 .Fn timerisset
-returns true if
-.Fa tvp
-is set to any time value other than the Epoch.
+and
+.Fn timespecisset
+return true if their argument is set to any time value other than the Epoch.
 .Pp
 .Fn timercmp
-compares
+and
+.Fn timespeccmp
+compare
 .Fa a
 to
 .Fa b
 using the comparison operator given in
 .Fa CMP ,
-and returns the result of that comparison.
+and return the result of that comparison.
 .Sh SEE ALSO
-.Xr gettimeofday 2
+.Xr gettimeofday 2 ,
+.Xr clock_gettime 2
 .Sh HISTORY
 The
 .Fn timeradd
@@ -117,3 +155,11 @@ family of macros were imported from
 .Nx 1.1 ,
 and appeared in
 .Fx 2.2.6 .
+The
+.Fn timespecadd
+family of macros were imported from
+.Nx 1.3
+into
+.Fx 3.0 ,
+though they were not exposed to userland until
+.Fx 12.0 .