--- src/lib/libc/sys/sigaction.2	2007/06/30 19:03:52	1.8
+++ src/lib/libc/sys/sigaction.2	2007/09/08 20:50:50	1.9
@@ -64,7 +64,8 @@ struct sigaction {
 The system defines a set of signals that may be delivered to a process.
 Signal delivery resembles the occurrence of a hardware interrupt:
 the signal is normally blocked from further occurrence, the current process
-context is saved, and a new one is built.  A process may specify a
+context is saved, and a new one is built.
+A process may specify a
 .Em handler
 to which a signal is delivered, or specify that a signal is to be
 .Em ignored .
@@ -77,7 +78,8 @@ in which case its delivery is postponed
 The action to be taken on delivery is determined at the time
 of delivery.
 Normally, signal handlers execute on the current stack
-of the process.  This may be changed, on a per-handler basis,
+of the process.
+This may be changed, on a per-handler basis,
 so that signals are taken on a special
 .Em "signal stack" .
 .Pp
@@ -88,9 +90,10 @@ but other signals may yet occur.
 A global
 .Em "signal mask"
 defines the set of signals currently blocked from delivery
-to a process.  The signal mask for a process is initialized
-from that of its parent (normally empty).  It
-may be changed with a
+to a process.
+The signal mask for a process is initialized
+from that of its parent (normally empty).
+It may be changed with a
 .Xr sigprocmask 2
 call, or when a signal is delivered to the process.
 .Pp
@@ -113,7 +116,8 @@ function.
 When a caught signal
 is delivered, the current state of the process is saved,
 a new signal mask is calculated (as described below),
-and the signal handler is invoked.  The call to the handler
+and the signal handler is invoked.
+The call to the handler
 is arranged so that if the signal handling routine returns
 normally the process will resume execution in the context
 from before the signal's delivery.
@@ -192,8 +196,8 @@ If this bit is set when calling
 for the
 .Dv SIGCHLD
 signal, the system will not create zombie processes when children of
-the calling process exit.  If the calling process subsequently issues
-a
+the calling process exit.
+If the calling process subsequently issues a
 .Xr wait 2
 (or equivalent), it blocks until all of the calling process's child
 processes terminate, and then returns a value of -1 with
@@ -425,7 +429,8 @@ Realtime Interfaces:
 .Fn timer_settime .
 .Pp
 All functions not in the above lists are considered to be unsafe
-with respect to signals.  That is to say, the behaviour of such
+with respect to signals.
+That is to say, the behaviour of such
 functions when called from a signal handler is undefined.
 .Sh RETURN VALUES
 .Rv -std sigaction
@@ -443,15 +448,24 @@ There are three possible prototypes the
 .Fn handler int "siginfo_t *info" "ucontext_t *uap" ;
 .El
 .Pp
-The handler function should match the SA_SIGINFO prototype if the
-SA_SIGINFO bit is set in flags.
+The handler function should match the
+.Dv SA_SIGINFO
+prototype if the
+.Dv SA_SIGINFO
+bit is set in flags.
 It then should be pointed to by the
 .Dv sa_sigaction
 member of
 .Dv struct sigaction .
-Note that you should not assign SIG_DFL or SIG_IGN this way.
+Note that you should not assign
+.Dv SIG_DFL
+or
+.Dv SIG_IGN
+this way.
 .Pp
-If the SA_SIGINFO flag is not set, the handler function should match
+If the
+.Dv SA_SIGINFO
+flag is not set, the handler function should match
 either the ANSI C or traditional
 .Bx
 prototype and be pointed to by
@@ -474,9 +488,9 @@ function needs to be casted to
 compile without warning.
 The traditional
 .Bx
-style is not portable and since its capabilities
-are a full subset of a SA_SIGINFO handler,
-its use is deprecated.
+style is not portable and since its capabilities are a full subset of a
+.Dv SA_SIGINFO
+handler, its use is deprecated.
 .Pp
 The
 .Fa sig
@@ -492,14 +506,17 @@ handler and the
 .Dv si_code
 member of the
 .Dv info
-argument to a SA_SIGINFO handler contain a numeric code explaining the
+argument to a
+.Dv SA_SIGINFO
+handler contain a numeric code explaining the
 cause of the signal, usually one of the
 .Dv SI_...
 values from
 .In sys/signal.h
-or codes specific to a signal, i.e. one of the
+or codes specific to a signal, i.e.\& one of the
 .Dv FPE_...
-values for SIGFPE.
+values for
+.Dv SIGFPE .
 .Pp
 The
 .Fa scp
@@ -510,8 +527,9 @@ sigcontext.
 .Pp
 The
 .Fa uap
-argument to a POSIX SA_SIGINFO handler points to an instance of
-ucontext_t.
+argument to a POSIX
+.Dv SA_SIGINFO
+handler points to an instance of ucontext_t.
 .Sh ERRORS
 .Fn Sigaction
 will fail and no new signal handler will be installed if one
@@ -584,7 +602,8 @@ The
 and
 .Dv SA_RESETHAND
 flags are intended for backwards compatibility with other operating
-systems.  The
+systems.
+The
 .Dv SA_NOCLDSTOP ,
 and
 .Dv SA_NOCLDWAIT