Rewrite page(2) references to page(3).
Add description of new libmach.
diff --git a/man/man3/open.3 b/man/man3/open.3
index 4bc887b..01d29c2 100644
--- a/man/man3/open.3
+++ b/man/man3/open.3
@@ -34,7 +34,7 @@
to zero length before opening it;
.B OCEXEC
says to close the file when an
-.IR exec (2)
+.IR exec (3)
or
.I execl
system call is made;
@@ -45,7 +45,7 @@
fails if the file does not exist or the user does not have
permission to open it for the requested purpose
(see
-.IR stat (2)
+.IR stat (3)
for a description of permissions).
The user must have write permission on the
.I file
@@ -58,7 +58,7 @@
(unlike the implicit
.I open
in
-.IR exec (2)),
+.IR exec (3)),
.B OEXEC
is actually identical to
.BR OREAD .
@@ -108,10 +108,10 @@
an error is returned.
If the file is new and the directory in which it is created is
a union directory (see
-.IR intro (2))
+.IR intro (3))
then the constituent directory where the file is created
depends on the structure of the union: see
-.IR bind (2).
+.IR bind (3).
.PP
Since
.I create
@@ -140,9 +140,9 @@
.SH SOURCE
.B /sys/src/libc/9syscall
.SH SEE ALSO
-.IR intro (2),
-.IR bind (2),
-.IR stat (2)
+.IR intro (3),
+.IR bind (3),
+.IR stat (3)
.SH DIAGNOSTICS
These functions set
.IR errstr .
