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
► common
alerts_internal.h
cib_secrets.h
internal.h
ipc.h	Wrappers for and extensions to libqb IPC
ipc_internal.h
ipcs.h
iso8601.h	ISO_8601 Date handling
iso8601_internal.h
logging.h	Wrappers for and extensions to libqb logging
mainloop.h	Wrappers for and extensions to glib mainloop
nvpair.h	Functionality for manipulating name/value pairs
remote_internal.h
results.h	Function and executable result codes
util.h	Utility functions
xml.h	Wrappers for and extensions to libxml2
xml_internal.h
► fencing
internal.h
► pengine
common.h
complex.h
internal.h
remote.h
rules.h
rules_internal.h
status.h	Cluster status and scheduling
attrd.h
cib.h	Cluster Configuration
cluster.h
compatibility.h
crm.h	A dumping ground
lrmd.h	Resource agent executor
lrmd_alerts_internal.h
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
► 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
membership.c
► common
acl.c
agents.c
alerts.c
attrd_client.c
cib_secrets.c
compat.c
crmcommon_private.h
digest.c
io.c
ipc.c
iso8601.c
logging.c
mainloop.c
nvpair.c
operations.c
pid.c
procfs.c
remote.c
results.c
schemas.c
strings.c
utils.c
watchdog.c
xml.c
xpath.c
► fencing
st_client.c
st_lha.c
st_rhcs.c
► gnu
md5.c
md5.h
stdalign.in.h
stdint.in.h
► lrmd
lrmd_alerts.c
lrmd_client.c
proxy_common.c
► pengine
clone.c
common.c
complex.c
container.c
failcounts.c
group.c
native.c
pe_status_private.h
remote.c
rules.c
rules_alerts.c
status.c
unpack.c
unpack.h
utils.c
variant.h
► services
dbus.c
pcmk-dbus.h
services.c
services_linux.c
services_lsb.c
services_lsb.h
services_private.h
systemd.c
systemd.h
upstart.c
upstart.h
► transition
graph.c
unpack.c
utils.c