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Dynamically create new threads if necessary. * nscd/connections.c (fd_ready): If no thread available for processing the request, create a new one unless the limit is reached. (start_threads): Check errors from pthread_create. * nscd/nscd.h: Declare max_nthreads. * nscd/nscd_conf.c: Parse max-nthreads entry. * nscd/nscd.conf: Add max-threads entry. * nscd/nscd_stat.c: Print current and maximum number of threads.
237 lines
7.3 KiB
C
237 lines
7.3 KiB
C
/* Copyright (c) 1998, 1999, 2000, 2001, 2003, 2004
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Thorsten Kukuk <kukuk@suse.de>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _NSCD_H
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#define _NSCD_H 1
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#include <pthread.h>
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#include <stdbool.h>
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#include <time.h>
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#include <sys/uio.h>
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/* The declarations for the request and response types are in the file
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"nscd-client.h", which should contain everything needed by client
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functions. */
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#include "nscd-client.h"
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/* Handle databases. */
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typedef enum
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{
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pwddb,
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grpdb,
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hstdb,
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lastdb
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} dbtype;
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/* Default limit on the number of times a value gets reloaded without
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being used in the meantime. NSCD does not throw a value out as
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soon as it times out. It tries to reload the value from the
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server. Only if the value has not been used for so many rounds it
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is removed. */
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#define DEFAULT_RELOAD_LIMIT 5
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/* Time before restarting the process in paranoia mode. */
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#define RESTART_INTERVAL (60 * 60)
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/* Structure describing dynamic part of one database. */
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struct database_dyn
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{
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pthread_rwlock_t lock;
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int enabled;
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int check_file;
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int persistent;
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int shared;
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const char *filename;
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const char *db_filename;
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time_t file_mtime;
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size_t suggested_module;
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int secure;
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unsigned long int postimeout; /* In seconds. */
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unsigned long int negtimeout; /* In seconds. */
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int wr_fd; /* Writable file descriptor. */
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int ro_fd; /* Unwritable file descriptor. */
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const struct iovec *disabled_iov;
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struct database_pers_head *head;
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char *data;
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size_t memsize;
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pthread_mutex_t memlock;
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bool mmap_used;
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bool last_alloc_failed;
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};
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/* Paths of the file for the persistent storage. */
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#define _PATH_NSCD_PASSWD_DB "/var/run/nscd/passwd"
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#define _PATH_NSCD_GROUP_DB "/var/run/nscd/group"
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#define _PATH_NSCD_HOSTS_DB "/var/run/nscd/hosts"
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/* Global variables. */
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extern struct database_dyn dbs[lastdb];
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extern const char *dbnames[lastdb];
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extern const char *serv2str[LASTREQ];
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extern const struct iovec pwd_iov_disabled;
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extern const struct iovec grp_iov_disabled;
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extern const struct iovec hst_iov_disabled;
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/* Initial number of threads to run. */
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extern int nthreads;
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/* Maximum number of threads to use. */
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extern int max_nthreads;
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/* Tables for which we cache data with uid. */
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extern int secure_in_use; /* Is one of the above 1? */
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/* User name to run server processes as. */
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extern const char *server_user;
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/* Name and UID of user who is allowed to request statistics. */
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extern const char *stat_user;
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extern uid_t stat_uid;
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/* Time the server was started. */
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extern time_t start_time;
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/* Number of times clients had to wait. */
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extern unsigned long int client_queued;
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/* Maximum needed alignment. */
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extern const size_t block_align;
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/* Number of times a value is reloaded without being used. UINT_MAX
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means unlimited. */
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extern unsigned int reload_count;
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/* Pagesize minus one. */
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extern uintptr_t pagesize_m1;
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/* Nonzero if paranoia mode is enabled. */
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extern int paranoia;
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/* Time after which the process restarts. */
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extern time_t restart_time;
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/* How much time between restarts. */
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extern time_t restart_interval;
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/* Old current working directory. */
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extern const char *oldcwd;
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/* Old user and group ID. */
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extern uid_t old_uid;
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extern gid_t old_gid;
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/* Prototypes for global functions. */
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/* nscd.c */
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extern void termination_handler (int signum) __attribute__ ((__noreturn__));
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extern int nscd_open_socket (void);
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/* connections.c */
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extern void nscd_init (void);
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extern void close_sockets (void);
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extern void start_threads (void) __attribute__ ((__noreturn__));
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/* nscd_conf.c */
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extern int nscd_parse_file (const char *fname,
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struct database_dyn dbs[lastdb]);
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/* nscd_stat.c */
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extern void send_stats (int fd, struct database_dyn dbs[lastdb]);
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extern int receive_print_stats (void) __attribute__ ((__noreturn__));
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/* cache.c */
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extern struct datahead *cache_search (request_type, void *key, size_t len,
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struct database_dyn *table,
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uid_t owner);
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extern int cache_add (int type, const void *key, size_t len,
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struct datahead *packet, bool first,
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struct database_dyn *table, uid_t owner);
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extern void prune_cache (struct database_dyn *table, time_t now);
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/* pwdcache.c */
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extern void addpwbyname (struct database_dyn *db, int fd, request_header *req,
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void *key, uid_t uid);
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extern void addpwbyuid (struct database_dyn *db, int fd, request_header *req,
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void *key, uid_t uid);
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extern void readdpwbyname (struct database_dyn *db, struct hashentry *he,
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struct datahead *dh);
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extern void readdpwbyuid (struct database_dyn *db, struct hashentry *he,
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struct datahead *dh);
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/* grpcache.c */
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extern void addgrbyname (struct database_dyn *db, int fd, request_header *req,
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void *key, uid_t uid);
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extern void addgrbygid (struct database_dyn *db, int fd, request_header *req,
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void *key, uid_t uid);
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extern void readdgrbyname (struct database_dyn *db, struct hashentry *he,
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struct datahead *dh);
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extern void readdgrbygid (struct database_dyn *db, struct hashentry *he,
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struct datahead *dh);
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/* hstcache.c */
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extern void addhstbyname (struct database_dyn *db, int fd, request_header *req,
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void *key, uid_t uid);
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extern void addhstbyaddr (struct database_dyn *db, int fd, request_header *req,
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void *key, uid_t uid);
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extern void addhstbynamev6 (struct database_dyn *db, int fd,
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request_header *req, void *key, uid_t uid);
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extern void addhstbyaddrv6 (struct database_dyn *db, int fd,
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request_header *req, void *key, uid_t uid);
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extern void readdhstbyname (struct database_dyn *db, struct hashentry *he,
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struct datahead *dh);
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extern void readdhstbyaddr (struct database_dyn *db, struct hashentry *he,
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struct datahead *dh);
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extern void readdhstbynamev6 (struct database_dyn *db, struct hashentry *he,
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struct datahead *dh);
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extern void readdhstbyaddrv6 (struct database_dyn *db, struct hashentry *he,
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struct datahead *dh);
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/* aicache.c */
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extern void addhstai (struct database_dyn *db, int fd, request_header *req,
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void *key, uid_t uid);
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extern void readdhstai (struct database_dyn *db, struct hashentry *he,
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struct datahead *dh);
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/* initgrcache.c */
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extern void addinitgroups (struct database_dyn *db, int fd,
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request_header *req, void *key, uid_t uid);
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extern void readdinitgroups (struct database_dyn *db, struct hashentry *he,
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struct datahead *dh);
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/* mem.c */
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extern void *mempool_alloc (struct database_dyn *db, size_t len);
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extern void gc (struct database_dyn *db);
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/* nscd_setup_thread.c */
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extern void setup_thread (struct database_dyn *db);
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#endif /* nscd.h */
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