pg_recvlogical.c code review.

Several comments still referred to 'initiating', 'freeing', 'stopping'
replication slots. These were terms used during different phases of
the development of logical decoding, but are no long accurate.

Also rename StreamLog() to StreamLogicalLog() and add 'void' to the
prototype.

Author: Michael Paquier, with some editing by me.

Backpatch to 9.4 where pg_recvlogical was introduced.

src/bin/pg_basebackup/pg_recvlogical.c

@@ -56,7 +56,7 @@ static XLogRecPtr output_written_lsn = InvalidXLogRecPtr;
 static XLogRecPtr output_fsync_lsn = InvalidXLogRecPtr;
 
 static void usage(void);
-static void StreamLog();
+static void StreamLogicalLog(void);
 static void disconnect_and_exit(int code);
 
 static void
@@ -194,7 +194,7 @@ OutputFsync(int64 now)
  * Start the log streaming
  */
 static void
-StreamLog(void)
+StreamLogicalLog(void)
 {
 	PGresult   *res;
 	char	   *copybuf = NULL;
@@ -868,7 +868,7 @@ main(int argc, char **argv)
 
 
 	/*
-	 * stop a replication slot
+	 * drop a replication slot
 	 */
 	if (do_drop_slot)
 	{
@@ -876,7 +876,7 @@ main(int argc, char **argv)
 
 		if (verbose)
 			fprintf(stderr,
-					_("%s: freeing replication slot \"%s\"\n"),
+					_("%s: dropping replication slot \"%s\"\n"),
 					progname, replication_slot);
 
 		snprintf(query, sizeof(query), "DROP_REPLICATION_SLOT \"%s\"",
@@ -892,8 +892,8 @@ main(int argc, char **argv)
 		if (PQntuples(res) != 0 || PQnfields(res) != 0)
 		{
 			fprintf(stderr,
-					_("%s: could not stop logical replication: got %d rows and %d fields, expected %d rows and %d fields\n"),
-					progname, PQntuples(res), PQnfields(res), 0, 0);
+					_("%s: could not drop replication slot \"%s\": got %d rows and %d fields, expected %d rows and %d fields\n"),
+					progname, replication_slot, PQntuples(res), PQnfields(res), 0, 0);
 			disconnect_and_exit(1);
 		}
 
@@ -902,7 +902,7 @@ main(int argc, char **argv)
 	}
 
 	/*
-	 * init a replication slot
+	 * create a replication slot
 	 */
 	if (do_create_slot)
 	{
@@ -910,7 +910,7 @@ main(int argc, char **argv)
 
 		if (verbose)
 			fprintf(stderr,
-					_("%s: initializing replication slot \"%s\"\n"),
+					_("%s: creating replication slot \"%s\"\n"),
 					progname, replication_slot);
 
 		snprintf(query, sizeof(query), "CREATE_REPLICATION_SLOT \"%s\" LOGICAL \"%s\"",
@@ -927,8 +927,8 @@ main(int argc, char **argv)
 		if (PQntuples(res) != 1 || PQnfields(res) != 4)
 		{
 			fprintf(stderr,
-					_("%s: could not init logical replication: got %d rows and %d fields, expected %d rows and %d fields\n"),
-					progname, PQntuples(res), PQnfields(res), 1, 4);
+					_("%s: could not create replication slot \"%s\": got %d rows and %d fields, expected %d rows and %d fields\n"),
+					progname, replication_slot, PQntuples(res), PQnfields(res), 1, 4);
 			disconnect_and_exit(1);
 		}