Here is a list of all files with brief descriptions:

[detail level 1234]

▼ include
▼ crm
► cib
internal.h
util.h
► cluster
election.h	Functions for conducting elections
internal.h
plugin.h
► common
cib_secrets.h
io.h	Internal I/O utilities
ipc.h	Wrappers for and extensions to libqb IPC
ipcs.h
iso8601.h	ISO_8601 Date handling
logging.h	Wrappers for and extensions to libqb logging
mainloop.h	Wrappers for and extensions to glib mainloop
procfs.h	Internal procfs utilities
util.h	Utility functions
xml.h	Wrappers for and extensions to libxml2
► fencing
internal.h
► pengine
common.h
complex.h
internal.h
rules.h
status.h
attrd.h
cib.h	Cluster Configuration
cluster.h
compatibility.h
crm.h	A dumping ground
error.h	Error codes and asserts
lrmd.h	Local Resource Manager
msg_xml.h
services.h	Services API
stonith-ng.h	Fencing aka. STONITH
transition.h
config.h
crm_config.h
crm_internal.h
doxygen.h	Fake header file that contains doxygen documentation
portability.h
▼ lib
▼ ais
plugin.c
plugin.h
utils.c
utils.h
▼ cib
cib_attrs.c
cib_client.c
cib_file.c
cib_native.c
cib_ops.c
cib_remote.c
cib_utils.c
▼ cluster
cluster.c
corosync.c
cpg.c
election.c
heartbeat.c
legacy.c
membership.c
▼ common
cib_secrets.c
compat.c
digest.c
io.c
ipc.c
iso8601.c
logging.c
mainloop.c
procfs.c
remote.c
utils.c
watchdog.c
xml.c
xpath.c
▼ fencing
st_client.c
▼ gnu
md5.c
md5.h
stdalign.in.h
stdint.in.h
▼ lrmd
lrmd_client.c
proxy_common.c
▼ pengine
clone.c
common.c
complex.c
group.c
native.c
rules.c
status.c
unpack.c
unpack.h
utils.c
variant.h
▼ services
dbus.c
pcmk-dbus.h
services.c
services_linux.c
services_private.h
systemd.c
systemd.h
upstart.c
upstart.h
▼ transition
graph.c
unpack.c
utils.c