Index: head/share/man/man3/intro.3
===================================================================
--- head/share/man/man3/intro.3
+++ head/share/man/man3/intro.3
@@ -28,12 +28,17 @@
 .\"     @(#)intro.3	8.1 (Berkeley) 6/5/93
 .\" $FreeBSD$
 .\"
-.Dd March 22, 2017
+.Dd October 6, 2020
 .Dt INTRO 3
 .Os
 .Sh NAME
 .Nm intro
 .Nd introduction to the C libraries
+.Sh SYNOPSIS
+.Nm cc
+.Op Ar flags
+.Ar
+.Op Fl llibrary
 .Sh DESCRIPTION
 This section provides an overview of the C
 library functions, their error returns and other
@@ -47,7 +52,11 @@
 option of the compiler.
 .Pp
 The various libraries (followed by the loader flag):
-.Bl -tag -width "libc (-lc)"
+.Bl -tag -width "libbluetooth (-lbluetooth)"
+.It Em libbluetooth Pq Fl l Ns Ar bluetooth
+The bluetooth library.
+See
+.Xr bluetooth 3 .
 .It Em libc Pq Fl l Ns Ar c
 Standard C library functions.
 When using the C compiler
@@ -57,21 +66,58 @@
 .Fl l Ns Ar c
 for these functions.
 There are several `libraries' or groups of functions included inside of
-.Em libc
-: the standard
-.Tn I/O
-routines,
-database routines,
-bit operators,
-string operators,
-character tests and character operators,
-des encryption routines,
-storage allocation, time functions, signal handling and more.
+.Em libc :
+.Bl -tag -width "XXXXXX"
+.It standard I/O routines
+see
+.Xr stdio 3
+.It database routines
+see
+.Xr db 3
+.It bit operators
+see
+.Xr bitstring 3
+.It string operators
+see
+.Xr string 3
+.It character tests and character operators
+.It storage allocation
+see
+.Xr mpool 3
+.It regular-expressions
+see
+.Xr regex 3
+.It remote procedure calls (RPC)
+see
+.Xr rpc 3
+.It time functions
+see
+.Xr time 3
+.It signal handling
+see
+.Xr signal 3
+.El
+.It Em libcalendar Pq Fl l Ns Ar calendar
+The calendar arithmetic library.
+See
+.Xr calendar 3 .
+.It Em libcam Pq Fl l Ns Ar cam
+The common access method user library.
+See
+.Xr cam 3 .
+.It Em libcrypt Pq Fl l Ns Ar crypt
+The crypt library.
+See
+.Xr crypt 3 .
 .It Em libcurses Pq Fl l Ns Ar curses Fl l Ns Ar termcap
 Terminal independent screen management routines
 for two dimensional non-bitmap display terminals.
-(See
-.Xr ncurses 3 . )
+See
+.Xr ncurses 3 .
+.It Em libcuse Pq Fl l Ns Ar cuse
+The userland character device library.
+See
+.Xr cuse 3 .
 .It Em libcompat Pq Fl l Ns Ar compat
 Functions which are obsolete but are available for compatibility with
 .Bx 4.3 .
@@ -82,32 +128,106 @@
 Use of these routines should, for the most part, be avoided.
 The manual page entry for each compatibility routine
 indicates the proper interface to use.
+.It Em libdevinfo Pq Fl l Ns Ar devinfo
+The Device and Resource Information Utility library.
+See
+.Xr devinfo 3 .
+.It Em libdevstat Pq Fl l Ns Ar devstat
+The Device Statistics library.
+See
+.Xr devstat 3 .
+.It Em libdwarf Pq Fl l Ns Ar dwarf
+The DWARF access library.
+See
+.Xr dwarf 3 .
+.It Em libelf Pq Fl l Ns Ar elf
+The ELF access library.
+See
+.Xr elf 3 .
+.It Em libfetch Pq Fl l Ns Ar fetch
+The file transfer library.
+See
+.Xr fetch 3 .
+.It Em libfigpar Pq Fl l Ns Ar figpar
+The configuration file parsing library.
+See
+.Xr figpar 3 .
+.It Em libgpio Pq Fl l Ns Ar gpio
+The general-purpose input output library (GPIO).
+See
+.Xr gpio 3 .
+.It Em libgssapi Pq Fl l Ns Ar gssapi
+The generic security service application programming
+interface.
+See
+.Xr gssapi 3 .
+.It Em libjail Pq Fl l Ns Ar jail
+The jail library.
+See
+.Xr jail 3 .
 .It Em libkvm Pq Fl l Ns Ar kvm
 Functions used to access kernel memory are in this library.
 They can be used
 against both a running system and a crash dump.
-(See
-.Xr kvm 3 . )
+See
+.Xr kvm 3 .
 .It Em libl Pq Fl l Ns Ar l
 The library for
 .Xr lex 1 .
 .It Em libm Pq Fl l Ns Ar m
-The math library,
-.Em libm .
-The math library is loaded as needed by the Pascal compiler,
-but not by the C compiler which requires the
-.Fl l Ns Ar m
-flag.
-(See
-.Xr math 3 . )
+The math library.
+See
+.Xr math 3 .
+.It Em libmd Pq Fl l Ns Ar md
+The message digest library.
+See
+.Xr md4 3 ,
+.Xr md5 3 ,
+.Xr sha 3 ,
+.Xr sha256 3 ,
+.Xr sha512 3 ,
+.Xr ripemd 3 ,
+.Xr skein 3 .
 .It Em libmp Pq Fl l Ns Ar mp
+.It Em libpam Pq Fl l Ns Ar pam
+The pluggable authentication module library.
+See
+.Xr pam 3 .
+.It Em libpcap Pq Fl l Ns Ar pcap
+The packet capture library.
+See
+.Xr pcap 3 .
+.It Em libpmc Pq Fl l Ns Ar pmc
+The performance counters library.
+See
+.Xr pmc 3 .
+.It Em libpthread Pq Fl l Ns Ar pthread
+The POSIX threads library.
+See
+.Xr pthread 3 .
+.It Em libsysdecode Pq Fl l Ns Ar sysdecode
+The system argument decoding library.
+See
+.Xr sysdecode 3 .
 .It Em libtermcap Pq Fl l Ns Ar termcap
 The terminal independent operation library package.
-(See
-.Xr termcap 3 . )
+See
+.Xr termcap 3 .
+.It Em libusb Pq Fl l Ns Ar usb
+The USB access library.
+See
+.Xr usb 3 .
+.It Em libvgl Pq Fl l Ns Ar vgl
+The video graphics library.
+See
+.Xr vgl 3 .
 .It Em liby Pq Fl l Ns Ar y
 The library for
 .Xr yacc 1 .
+.It Em libz Pq Fl l Ns Ar z
+The general-purpose data compression library.
+See
+.Xr zlib 3 .
 .El
 .Sh FILES
 .Bl -tag -width /usr/lib/libm_p.a -compact