1.4. The Layout of /usr/src

The complete source code to FreeBSD is available from our public repository. The source code is normally installed in /usr/src which contains the following subdirectories:

bin/Source for files in /bin
cddl/Utilities covered by the Common Development and Distribution License
contrib/Source for files from contributed software
crypto/Cryptographical sources
etc/Source for files in /etc
gnu/Utilities covered by the GNU Public License
include/Source for files in /usr/include
kerberos5/Source for Kerberos version 5
lib/Source for files in /usr/lib
libexec/Source for files in /usr/libexec
release/Files required to produce a FreeBSD release
rescue/Build system for the /rescue utilities
sbin/Source for files in /sbin
secure/Contributed cryptographic sources
share/Source for files in /usr/share
sys/Kernel source files
tests/The FreeBSD test suite
tools/Tools used for maintenance and testing of FreeBSD
usr.bin/Source for files in /usr/bin
usr.sbin/Source for files in /usr/sbin

All FreeBSD documents are available for download at https://download.freebsd.org/ftp/doc/

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