--- /dev/null
+CREATE EXTENSION adminpack;
+-- create new file
+SELECT pg_file_write('test_file1', 'test1', false);
+ pg_file_write
+---------------
+ 5
+(1 row)
+
+SELECT pg_read_file('test_file1');
+ pg_read_file
+--------------
+ test1
+(1 row)
+
+-- append
+SELECT pg_file_write('test_file1', 'test1', true);
+ pg_file_write
+---------------
+ 5
+(1 row)
+
+SELECT pg_read_file('test_file1');
+ pg_read_file
+--------------
+ test1test1
+(1 row)
+
+-- error, already exists
+SELECT pg_file_write('test_file1', 'test1', false);
+ERROR: file "test_file1" exists
+SELECT pg_read_file('test_file1');
+ pg_read_file
+--------------
+ test1test1
+(1 row)
+
+-- disallowed file paths
+SELECT pg_file_write('../test_file0', 'test0', false);
+ERROR: path must be in or below the current directory
+SELECT pg_file_write('/tmp/test_file0', 'test0', false);
+ERROR: absolute path not allowed
+SELECT pg_file_write(current_setting('data_directory') || '/test_file4', 'test4', false);
+ pg_file_write
+---------------
+ 5
+(1 row)
+
+SELECT pg_file_write(current_setting('data_directory') || '/../test_file4', 'test4', false);
+ERROR: reference to parent directory ("..") not allowed
+-- rename file
+SELECT pg_file_rename('test_file1', 'test_file2');
+ pg_file_rename
+----------------
+ t
+(1 row)
+
+SELECT pg_read_file('test_file1'); -- not there
+ERROR: could not stat file "test_file1": No such file or directory
+SELECT pg_read_file('test_file2');
+ pg_read_file
+--------------
+ test1test1
+(1 row)
+
+-- error
+SELECT pg_file_rename('test_file1', 'test_file2');
+WARNING: file "test_file1" is not accessible: No such file or directory
+ pg_file_rename
+----------------
+ f
+(1 row)
+
+-- rename file and archive
+SELECT pg_file_write('test_file3', 'test3', false);
+ pg_file_write
+---------------
+ 5
+(1 row)
+
+SELECT pg_file_rename('test_file2', 'test_file3', 'test_file3_archive');
+ pg_file_rename
+----------------
+ t
+(1 row)
+
+SELECT pg_read_file('test_file2'); -- not there
+ERROR: could not stat file "test_file2": No such file or directory
+SELECT pg_read_file('test_file3');
+ pg_read_file
+--------------
+ test1test1
+(1 row)
+
+SELECT pg_read_file('test_file3_archive');
+ pg_read_file
+--------------
+ test3
+(1 row)
+
+-- unlink
+SELECT pg_file_unlink('test_file1'); -- does not exist
+ pg_file_unlink
+----------------
+ f
+(1 row)
+
+SELECT pg_file_unlink('test_file2'); -- does not exist
+ pg_file_unlink
+----------------
+ f
+(1 row)
+
+SELECT pg_file_unlink('test_file3');
+ pg_file_unlink
+----------------
+ t
+(1 row)
+
+SELECT pg_file_unlink('test_file3_archive');
+ pg_file_unlink
+----------------
+ t
+(1 row)
+
+SELECT pg_file_unlink('test_file4');
+ pg_file_unlink
+----------------
+ t
+(1 row)
+
+-- superuser checks
+CREATE USER regress_user1;
+SET ROLE regress_user1;
+SELECT pg_file_write('test_file0', 'test0', false);
+ERROR: only superuser may access generic file functions
+SELECT pg_file_rename('test_file0', 'test_file0');
+ERROR: only superuser may access generic file functions
+CONTEXT: SQL function "pg_file_rename" statement 1
+SELECT pg_file_unlink('test_file0');
+ERROR: only superuser may access generic file functions
+SELECT pg_logdir_ls();
+ERROR: only superuser can list the log directory
+RESET ROLE;
+DROP USER regress_user1;
+-- no further tests for pg_logdir_ls() because it depends on the
+-- server's logging setup
--- /dev/null
+CREATE EXTENSION adminpack;
+
+-- create new file
+SELECT pg_file_write('test_file1', 'test1', false);
+SELECT pg_read_file('test_file1');
+
+-- append
+SELECT pg_file_write('test_file1', 'test1', true);
+SELECT pg_read_file('test_file1');
+
+-- error, already exists
+SELECT pg_file_write('test_file1', 'test1', false);
+SELECT pg_read_file('test_file1');
+
+-- disallowed file paths
+SELECT pg_file_write('../test_file0', 'test0', false);
+SELECT pg_file_write('/tmp/test_file0', 'test0', false);
+SELECT pg_file_write(current_setting('data_directory') || '/test_file4', 'test4', false);
+SELECT pg_file_write(current_setting('data_directory') || '/../test_file4', 'test4', false);
+
+
+-- rename file
+SELECT pg_file_rename('test_file1', 'test_file2');
+SELECT pg_read_file('test_file1'); -- not there
+SELECT pg_read_file('test_file2');
+
+-- error
+SELECT pg_file_rename('test_file1', 'test_file2');
+
+-- rename file and archive
+SELECT pg_file_write('test_file3', 'test3', false);
+SELECT pg_file_rename('test_file2', 'test_file3', 'test_file3_archive');
+SELECT pg_read_file('test_file2'); -- not there
+SELECT pg_read_file('test_file3');
+SELECT pg_read_file('test_file3_archive');
+
+
+-- unlink
+SELECT pg_file_unlink('test_file1'); -- does not exist
+SELECT pg_file_unlink('test_file2'); -- does not exist
+SELECT pg_file_unlink('test_file3');
+SELECT pg_file_unlink('test_file3_archive');
+SELECT pg_file_unlink('test_file4');
+
+
+-- superuser checks
+CREATE USER regress_user1;
+SET ROLE regress_user1;
+
+SELECT pg_file_write('test_file0', 'test0', false);
+SELECT pg_file_rename('test_file0', 'test_file0');
+SELECT pg_file_unlink('test_file0');
+SELECT pg_logdir_ls();
+
+RESET ROLE;
+DROP USER regress_user1;
+
+
+-- no further tests for pg_logdir_ls() because it depends on the
+-- server's logging setup