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authorUlrich Drepper <drepper@redhat.com>2004-09-08 15:46:42 +0000
committerUlrich Drepper <drepper@redhat.com>2004-09-08 15:46:42 +0000
commitc207f23b0b6b2d215be65e670d453768ad304247 (patch)
tree5d10943ec51bbda849db9ca2fdcc7b43feb2011c /nscd/nscd-client.h
parent0a3ad40da92c0036bd3bd87949f7d7d9864c31c7 (diff)
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Update.
* nscd/connections.c: Implement r/o sharing of nscd's cache with client processes via shared memory. * nscd/nscd-client.h: Likewise. * nscd/nscd.h: Likewise. * nscd/nscd_conf.c: Likewise. * nscd/nscd_getgr_r.c: Likewise. * nscd/nscd_getpw_r.c: Likewise. * nscd/nscd_gethst_r.c: Likewise. * nscd/nscd.conf: Add new config parameters. * nscd/Makefile (aux): Add nscd_helper. * nscd/nscd_helper.c: New file. * nscd/mem.c (gc): Indicate beginning and end of the gc cycle. * nscd/hstcache.c: Simplify a lot. We cache only the request itself, no derived information. * connections.c (nscd_init): Fix bug in testing size of the persistent. * nis/Makefile (aux): Add nis_hash. * nis/nis_hash.c: New file. Split out from nis_util.c. * nis/nis_util.c: Move __nis_hash code in separate file. * csu/tst-atomic.c: Improve atomic_increment_val test which would not have found a ppc bug.
Diffstat (limited to 'nscd/nscd-client.h')
-rw-r--r--nscd/nscd-client.h146
1 files changed, 146 insertions, 0 deletions
diff --git a/nscd/nscd-client.h b/nscd/nscd-client.h
index 470bc69..708f62d 100644
--- a/nscd/nscd-client.h
+++ b/nscd/nscd-client.h
@@ -23,6 +23,7 @@
#ifndef _NSCD_CLIENT_H
#define _NSCD_CLIENT_H 1
+#include <atomic.h>
#include <nscd-types.h>
/* Version number of the daemon interface */
@@ -53,6 +54,9 @@ typedef enum
SHUTDOWN, /* Shut the server down. */
GETSTAT, /* Get the server statistic. */
INVALIDATE, /* Invalidate one special cache. */
+ GETFDPW,
+ GETFDGR,
+ GETFDHST,
LASTREQ
} request_type;
@@ -110,9 +114,151 @@ typedef struct
} hst_response_header;
+/* Type for offsets in data part of database. */
+typedef uint32_t ref_t;
+/* Value for invalid/no reference. */
+#define ENDREF UINT32_MAX
+
+/* Alignment requirement of the beginning of the data region. */
+#define ALIGN 16
+
+
+/* Head of record in data part of database. */
+struct datahead
+{
+ size_t allocsize; /* Allocated Bytes. */
+ size_t recsize; /* Size of the record. */
+ time_t timeout; /* Time when this entry becomes invalid. */
+ bool notfound; /* Nonzero if data for key has not been found. */
+ uint8_t nreloads; /* Reloads without use. */
+ bool usable; /* False if the entry must be ignored. */
+
+ /* We need to have the following element aligned for the response
+ header data types and their use in the 'struct dataset' types
+ defined in the XXXcache.c files. */
+ union
+ {
+ pw_response_header pwdata;
+ gr_response_header grdata;
+ hst_response_header hstdata;
+ ssize_t align1;
+ time_t align2;
+ } data[0];
+};
+
+
+/* Structure for one hash table entry. */
+struct hashentry
+{
+ request_type type:8; /* Which type of dataset. */
+ bool first; /* True if this was the original key. */
+ size_t len; /* Length of key. */
+ ref_t key; /* Pointer to key. */
+ uid_t owner; /* If secure table, this is the owner. */
+ ref_t next; /* Next entry in this hash bucket list. */
+ ref_t packet; /* Records for the result. */
+ union
+ {
+ struct hashentry *dellist; /* Next record to be deleted. This can be a
+ pointer since only nscd uses this field. */
+ ref_t *prevp; /* Pointer to field containing forward
+ reference. */
+ };
+};
+
+
+/* Current persistent database version. */
+#define DB_VERSION 1
+
+/* Maximum time allowed between updates of the timestamp. */
+#define MAPPING_TIMEOUT (5 * 60)
+
+
+/* Header of persistent database file. */
+struct database_pers_head
+{
+ int version;
+ int header_size;
+ int gc_cycle;
+ volatile time_t timestamp;
+
+ size_t module;
+ size_t data_size;
+
+ size_t first_free; /* Offset of first free byte in data area. */
+
+ size_t nentries;
+ size_t maxnentries;
+ size_t maxnsearched;
+
+ uintmax_t poshit;
+ uintmax_t neghit;
+ uintmax_t posmiss;
+ uintmax_t negmiss;
+
+ uintmax_t rdlockdelayed;
+ uintmax_t wrlockdelayed;
+
+ uintmax_t addfailed;
+
+ ref_t array[0];
+};
+
+
+/* Mapped database record. */
+struct mapped_database
+{
+ const struct database_pers_head *head;
+ const char *data;
+ size_t mapsize;
+ int counter; /* > 0 indicates it isusable. */
+};
+#define NO_MAPPING ((struct mapped_database *) -1l)
+
+struct locked_map_ptr
+{
+ int lock;
+ struct mapped_database *mapped;
+};
+#define libc_locked_map_ptr(name) static struct locked_map_ptr name
+
+
/* Open socket connection to nscd server. */
extern int __nscd_open_socket (const char *key, size_t keylen,
request_type type, void *response,
size_t responselen) attribute_hidden;
+/* Get reference of mapping. */
+extern struct mapped_database *__nscd_get_map_ref (request_type type,
+ const char *name,
+ struct locked_map_ptr *mapptr,
+ int *gc_cyclep);
+
+/* Unmap database. */
+extern void __nscd_unmap (struct mapped_database *mapped);
+
+/* Drop reference of mapping. */
+static inline int __nscd_drop_map_ref (struct mapped_database *map,
+ int gc_cycle)
+{
+ if (map != NO_MAPPING)
+ {
+ if (__builtin_expect (map->head->gc_cycle != gc_cycle, 0))
+ /* We might have read inconsistent data. */
+ return -1;
+
+ if (atomic_decrement_val (&map->counter) == 0)
+ __nscd_unmap (map);
+ }
+
+ return 0;
+}
+
+
+/* Search the mapped database. */
+extern const struct datahead * __nscd_cache_search (request_type type,
+ const char *key,
+ size_t keylen,
+ const struct mapped_database *mapped);
+
#endif /* nscd.h */