diff options
Diffstat (limited to 'nscd/nscd-client.h')
| -rw-r--r-- | nscd/nscd-client.h | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/nscd/nscd-client.h b/nscd/nscd-client.h index 470bc6986e..708f62d6aa 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 */ |