pgsql: Add files to do read I/O on the cluster directory:

Log Message:
-----------
Add files to do read I/O on the cluster directory:

pg_stat_file()
pg_read_file()
pg_ls_dir()
pg_reload_conf()
pg_rotate_logfile()

Dave Page
Andreas Pflug

Modified Files:
--------------
pgsql/doc/src/sgml:
func.sgml (r1.276 -> r1.277)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml.diff?r1=1.276&r2=1.277)
pgsql/src/backend/postmaster:
postmaster.c (r1.462 -> r1.463)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/postmaster.c.diff?r1=1.462&r2=1.463)
syslogger.c (r1.18 -> r1.19)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/syslogger.c.diff?r1=1.18&r2=1.19)
pgsql/src/backend/utils/adt:
Makefile (r1.58 -> r1.59)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/Makefile.diff?r1=1.58&r2=1.59)
misc.c (r1.45 -> r1.46)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/misc.c.diff?r1=1.45&r2=1.46)
pgsql/src/include/catalog:
pg_proc.h (r1.380 -> r1.381)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_proc.h.diff?r1=1.380&r2=1.381)
pgsql/src/include/storage:
pmsignal.h (r1.12 -> r1.13)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/storage/pmsignal.h.diff?r1=1.12&r2=1.13)
pgsql/src/include/utils:
builtins.h (r1.262 -> r1.263)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/builtins.h.diff?r1=1.262&r2=1.263)

Added Files:
-----------
pgsql/src/backend/utils/adt:
genfile.c (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/genfile.c?rev=1.1&content-type=text/x-cvsweb-markup)