From f6dc51ad7914b60fe71a4fc53460925bdc513a9d Mon Sep 17 00:00:00 2001
From: Andre <maan@p133.(none)>
Date: Tue, 21 Feb 2006 09:09:36 +0100
Subject: [PATCH] add dbtool hooks

pre_select/post_select. Also, add a private_dbtool pointer for
each audio format to mmd.
---
 db.h     | 28 ++++++++++++++++++++++++++--
 para.h   |  6 ++++++
 server.c |  4 ++++
 server.h |  4 +++-
 4 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/db.h b/db.h
index 960bf59f..328f7de8 100644
--- a/db.h
+++ b/db.h
@@ -18,6 +18,8 @@
 
 /** \file db.h data structures common to all database tools */
 
+#include <sys/select.h>
+
 int find_audio_files(const char *dirname, int (*f)(const char *, const char *));
 
 /**
@@ -78,7 +80,7 @@ char **(*get_audio_file_list)(unsigned int num);
  * passed \a update_audio_file().
  *
  */
-void  (*update_audio_file)(char *audio_file);
+void (*update_audio_file)(char *audio_file);
 /**
  *
  * shutdown this database tool and free all resources
@@ -86,8 +88,30 @@ void  (*update_audio_file)(char *audio_file);
  * This gets called whenever the database tool changes (via the cdt command),
  * or when para_server receives the HUP signal, or when para_server shuts down.
  * It is assumed to succeed.
-*/
+ */
 void (*shutdown)(void);
+/**
+ *
+ * add file descriptors to fd_sets
+ *
+ * The pre_select function of the activated database tool gets called just
+ * before para_server enters its main select loop. The dbtool may add its own
+ * file descriptors to the \a rfds or the \a wfds set.
+ *
+ * If a file descriptor was added, \a max_fileno must be increased by
+ * this function, if neccessary.
+ *
+ * \sa select(2)
+ */
+int (*pre_select)(fd_set *rfds, fd_set *wfds);
+/**
+ * handle the file descriptors which are ready for I/O
+ *
+ * If the pre_select hook added one ore more file descriptors to the read or write
+ * set, this is the hook to check the result and do any I/O on those descriptors
+ * which are ready for reading/writing.
+ */
+void (*post_select)(fd_set *rfds, fd_set *wfds);
 };
 
 int mysql_dbtool_init(struct dbtool*);
diff --git a/para.h b/para.h
index 049262d3..e645cb1c 100644
--- a/para.h
+++ b/para.h
@@ -225,3 +225,9 @@ __printf_2_3 void para_log(int, char*, ...);
 
 
 
+enum supported_dbtools {DBT_DOPEY,
+#ifdef HAVE_MYSQL
+	DBT_MYSQL,
+#endif
+	NUM_DBTOOLS
+};
diff --git a/server.c b/server.c
index 71ee9eb6..8d943533 100644
--- a/server.c
+++ b/server.c
@@ -66,12 +66,16 @@ struct dbtool dblist[] = {
 		.name = "dopey",
 		.init = dopey_dbtool_init,
 		.update_audio_file = NULL,
+		.pre_select = NULL,
+		.post_select = NULL,
 	},
 #ifdef HAVE_MYSQL
 	{
 		.name = "mysql",
 		.init = mysql_dbtool_init,
 		.update_audio_file = NULL,
+		.pre_select = NULL,
+		.post_select = NULL,
 	},
 #endif
 	{
diff --git a/server.h b/server.h
index b01c3f6a..ba9b39e4 100644
--- a/server.h
+++ b/server.h
@@ -145,8 +145,10 @@ struct misc_meta_data{
 	int dbt_num;
 /** commands set this to non-zero to request a database tool change */
 	int dbt_change;
-/* used by the sender command */
+/** used by the sender command */
 	struct sender_command_data sender_cmd_data;
+/** each dbtool has its private data pointer */
+	void *private_dbtool_data[NUM_DBTOOLS];
 };
 
 
-- 
2.39.2