shaba/systemd
1
0
Fork 0
mirror of https://github.com/systemd/systemd.git synced 2024-11-06 16:59:03 +03:00
Code
c33359307b
systemd/udevdb.h

23 lines
754 B
C
Raw Normal View History

[PATCH] udevdb prototype Here's an "idea" of what I had in mind for udevdb. Let me preface the code with a few remarks: 1) I was expecting to write this udevdb for udev to keep track of devices. I was planning an external package that depends upon udev to provide an external API to the udevdb database. The calls for the interface would be read only access. Not sure how you want to do packaging, if having a separate package is ok or having it included in udev. 2) I created it as it is because udev isn't a daemon. So, the open database call doesn't take any parameters. My plan was to create a udevdb_init function that took arguments for initializing the db to start, where you could specify in memory only or a file location. This can all be filled in. 3) I hacked the Makefile to get it to work. Not sure how you'd want that in the future. 4) This assumes TDB has been installed elsewhere, you would need to edit your Makefile and point it to the header and library locations. How do you want to do TDB in udev? Do you want to just reference it and make udev dependent on that package being installed. Or should we do what samba does and include a limited tdb version in udev? 5) Again, I hacked udev into your existing code. In the future, I'd probably make a function around the filling out the udevice before calling the store command. Didn't know if you wanted to change your add device function to use struct udevice rather than having everything separate. 6) Not sure what we should include in the udevice structure that's stored by udev. I made a stab at a first shot - we can add and remove of course, this was a first pass. I've come to realize - with you including libsysfs in udev, the "external" interface that references udevdb could make use of getting information from through libsysfs from sysfs and doesn't need to be in udevdb. 7) I could write a namedevdb for namedev's device management if you wanted.
2003-08-06 10:57:23 +04:00
/*
* udevdb header file
*/
#ifndef _UDEVDB_H_
#define _UDEVDB_H_
[PATCH] udevdb patch This patch: 1) removes the three database files for just one udevdb.tdb file. 2) adds udevdb_init() and udevdb_exit() functions 3) initializes database now in main() in udev.c. Please look it over.
2003-10-15 10:20:53 +04:00
/* Udevdb initialization flags */
[PATCH] overall whitespace + debug text conditioning 01-overall-whitespace+debug-text-conditioning.diff o cleanup whitespace o clarify a few comments o enclose all printed debug string values in ''
2003-11-25 09:27:17 +03:00
#define UDEVDB_DEFAULT 0 /* defaults database to use file */
#define UDEVDB_INTERNAL 1 /* don't store db on disk, use in memory */
[PATCH] udevdb patch This patch: 1) removes the three database files for just one udevdb.tdb file. 2) adds udevdb_init() and udevdb_exit() functions 3) initializes database now in main() in udev.c. Please look it over.
2003-10-15 10:20:53 +04:00
[PATCH] overall whitespace + debug text conditioning 01-overall-whitespace+debug-text-conditioning.diff o cleanup whitespace o clarify a few comments o enclose all printed debug string values in ''
2003-11-25 09:27:17 +03:00
/* function prototypes */
[PATCH] udevdb patch This patch: 1) removes the three database files for just one udevdb.tdb file. 2) adds udevdb_init() and udevdb_exit() functions 3) initializes database now in main() in udev.c. Please look it over.
2003-10-15 10:20:53 +04:00
extern void udevdb_exit(void);
extern int udevdb_init(int init_flag);
[PATCH] make udev user callable to query the database Here is a slightly better version that prints the usage if a unknown option is given: kay@pim:~/src/udev.kay$ ./udev -x ./udev: invalid option -- x Usage: [-qrVh] -q arg query database -r print udev root -V print udev version -h print this help text > Here is a patch that makes it possible to call udev with options on the command line. > Valid options are for now: > > -V for the udev version: > kay@pim:~/src/udev.kay$ ./udev -V > udev, version 011_bk > > -r for the udev root: > kay@pim:~/src/udev.kay$ ./udev -r > /udev/ > > -q to query the database with the sysfs path for the name of the node: > kay@pim:~/src/udev.kay$ ./udev -q /class/video4linux/video0 > test/video/webcam0
2003-12-31 09:31:37 +03:00
extern int udevdb_open_ro(void);
[PATCH] udev - reverse user query options Here we get the ability to query with the name of the node instead of the device path. It uses a linear search over the whole database. kay@pim:~/src/udev.kay$ ./udev -q path -n video/webcam0 /class/video4linux/video0 New version, with better function return codes for error handling.
2004-01-20 06:40:32 +03:00
extern int udevdb_call_foreach(int (*user_record_handler) (char *path, struct udevice *dev));
[PATCH] major database cleanups Now we standardise on a struct udevice to pass around, and store in the database. This cleaned up the database code a lot.
2003-10-21 09:48:44 +04:00
extern int udevdb_add_dev(const char *path, const struct udevice *dev);
[PATCH] udev-remove.c cleanups I've moved the malloc out of the udevdb into udev-remove to free the struct after use and not to allocate a different struct in the case the device is not in the data base. I seems a bit easier to read.
2003-12-20 05:29:01 +03:00
extern int udevdb_get_dev(const char *path, struct udevice *dev);
[PATCH] more database work. Now we only store the info we really need right now. Also delete the record after the device is gone, and fix up a memory leak.
2003-10-21 07:28:42 +04:00
extern int udevdb_delete_dev(const char *path);
[PATCH] udev - reverse user query options Here we get the ability to query with the name of the node instead of the device path. It uses a linear search over the whole database. kay@pim:~/src/udev.kay$ ./udev -q path -n video/webcam0 /class/video4linux/video0 New version, with better function return codes for error handling.
2004-01-20 06:40:32 +03:00
extern int udevdb_get_dev_byname(const char *name, char *path, struct udevice *dev);
[PATCH] udevdb prototype Here's an "idea" of what I had in mind for udevdb. Let me preface the code with a few remarks: 1) I was expecting to write this udevdb for udev to keep track of devices. I was planning an external package that depends upon udev to provide an external API to the udevdb database. The calls for the interface would be read only access. Not sure how you want to do packaging, if having a separate package is ok or having it included in udev. 2) I created it as it is because udev isn't a daemon. So, the open database call doesn't take any parameters. My plan was to create a udevdb_init function that took arguments for initializing the db to start, where you could specify in memory only or a file location. This can all be filled in. 3) I hacked the Makefile to get it to work. Not sure how you'd want that in the future. 4) This assumes TDB has been installed elsewhere, you would need to edit your Makefile and point it to the header and library locations. How do you want to do TDB in udev? Do you want to just reference it and make udev dependent on that package being installed. Or should we do what samba does and include a limited tdb version in udev? 5) Again, I hacked udev into your existing code. In the future, I'd probably make a function around the filling out the udevice before calling the store command. Didn't know if you wanted to change your add device function to use struct udevice rather than having everything separate. 6) Not sure what we should include in the udevice structure that's stored by udev. I made a stab at a first shot - we can add and remove of course, this was a first pass. I've come to realize - with you including libsysfs in udev, the "external" interface that references udevdb could make use of getting information from through libsysfs from sysfs and doesn't need to be in udevdb. 7) I could write a namedevdb for namedev's device management if you wanted.
2003-08-06 10:57:23 +04:00
#endif /* _UDEVDB_H_ */
Copy Permalink