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. DS understands publishing and subscribing where keys are in string

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form. Subscriptions are regular expressions.
 . different types are stored per key; currently u32 and/or string.
   the same key can be referenced (publish, subscribe, check) as any type.
 . notify()s are sent when subscriptions are triggered (publishing or
   updating of matching keys); optionally, a subscribe flag sends
   updates for all matching keys at subscription time, instead of only
   after updates after subscribing
 . all interfacing to ds is in /usr/src/lib/syslib/ds.c.
 . subscribe is ds_subscribe
   publish functions are ds_publish_<type>
   retrieve functions are ds_retrieve_<type> (one-time retrieval of a value)
   check functions are ds_check_<type> (check for updated key caller
      subscribes to not yet checked for, or ESRCH for none)
 . ramdisk driver updated with new ds interface
This commit is contained in:
Ben Gras
2006-07-13 14:50:23 +00:00
parent d40007667c
commit 3512a86b44
11 changed files with 642 additions and 91 deletions
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17
include/minix/com.h
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@@ -65,6 +65,7 @@
# define NEW_KSIG NOTIFY_FROM(HARDWARE) /* new kernel signal */
# define FKEY_PRESSED NOTIFY_FROM(TTY_PROC_NR)/* function key press */
# define DEV_PING NOTIFY_FROM(RS_PROC_NR) /* driver liveness ping */
# define DS_UPDATE NOTIFY_FROM(DS_PROC_NR) /* subscription update */
/* Shorthands for message parameters passed with notifications. */
#define NOTIFY_SOURCE m_source
@@ -548,14 +549,18 @@
#define DS_RQ_BASE 0x800
#define DS_PUBLISH (DS_RQ_BASE + 0) /* publish information */
#define DS_RETRIEVE (DS_RQ_BASE + 1) /* retrieve information */
#define DS_SUBSCRIBE (DS_RQ_BASE + 2) /* subscribe to information */
#define DS_SUBSCRIBE (DS_RQ_BASE + 1) /* subscribe to information */
#define DS_RETRIEVE (DS_RQ_BASE + 2) /* retrieve information by name */
#define DS_CHECK (DS_RQ_BASE + 3) /* retrieve updated information */
# define DS_KEY m2_i1 /* key for the information */
/* DS field names: DS_SUBSCRIBE, DS_PUBLISH, DS_RETRIEVE */
# define DS_KEY_GRANT m2_p1 /* key for the information */
# define DS_KEY_LEN m2_i1 /* length of key incl. '\0' */
# define DS_FLAGS m2_i2 /* flags provided by caller */
# define DS_AUTH m2_p1 /* authorization of caller */
# define DS_VAL_L1 m2_l1 /* first long data value */
# define DS_VAL_L2 m2_l2 /* second long data value */
/* DS_PUBLISH, DS_RETRIEVE */
# define DS_VAL m2_l1 /* data (u32, char *, etc.) */
# define DS_VAL_LEN m2_l2 /* data length */
/*===========================================================================*
* Miscellaneous messages used by TTY *