s/realtime/real-time/

man3/clock_getres.3

@@ -101,7 +101,7 @@ argument is the identifier of the particular clock on which to act.
 A clock may be system-wide and hence visible for all processes, or
 per-process if it measures time only within a single process.
 .LP
-All implementations support the system-wide realtime clock,
+All implementations support the system-wide real-time clock,
 which is identified by
 .BR CLOCK_REALTIME .
 Its time represents seconds and nanoseconds since the Epoch.
@@ -116,7 +116,7 @@ Sufficiently recent versions of glibc and the Linux kernel
 support the following clocks:
 .TP
 .B CLOCK_REALTIME
-System-wide realtime clock.
+System-wide real-time clock.
 Setting this clock requires appropriate privileges.
 .TP
 .B CLOCK_MONOTONIC

man5/proc.5

@@ -1647,12 +1647,12 @@ rebooting?
 (Only in kernels up to and including 2.6.7; see
 .BR setrlimit (2))
 This file can be used to tune the maximum number
-of POSIX realtime (queued) signals that can be outstanding
+of POSIX real-time (queued) signals that can be outstanding
 in the system.
 .TP
 .I /proc/sys/kernel/rtsig-nr
 (Only in kernels up to and including 2.6.7.)
-This file shows the number POSIX realtime signals currently queued.
+This file shows the number POSIX real-time signals currently queued.
 .TP
 .IR /proc/sys/kernel/sem " (since Linux 2.4)"
 This file contains 4 numbers defining limits for System V IPC semaphores.

man7/socket.7

@@ -528,7 +528,7 @@ It is possible to use
 or
 .BR select (2)
 in the signal handler to find out which socket the event occurred on.
-An alternative (in Linux 2.2) is to set a realtime signal using the
+An alternative (in Linux 2.2) is to set a real-time signal using the
 .B F_SETSIG
 .BR fcntl (2);
 the handler of the real time signal will be called with