bt_open.c File Reference

#include <sys/param.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "../include/db.h"
#include "btree.h"

Include dependency graph for bt_open.c:

Go to the source code of this file.

Functions
int	__bt_fd (DB *dbp) const
DB *	__bt_open (char *fname, int flags, int mode, const BTREEINFO *openinfo, int dflags) const
static int byteorder	__P ((void))
static int nroot	__P ((BTREE *))
static int	byteorder ()
static int	nroot (BTREE *t)
static int	tmp ()

Function Documentation

__bt_fd()

int __bt_fd

(

DB *

dbp

)

const

Definition at line 439 of file bt_open.c.

References B_INMEM, _btree::bt_fd, _btree::bt_mp, _btree::bt_pinned, errno, F_ISSET, __db::internal, mpool_put(), and NULL.

Referenced by __bt_open().

{
   BTREE *t;

   t = dbp->internal;

   /* Toss any page pinned across calls. */
   if (t->bt_pinned != NULL) {
      mpool_put(t->bt_mp, t->bt_pinned, 0);
      t->bt_pinned = NULL;
   }

   /* In-memory database can't have a file descriptor. */
   if (F_ISSET(t, B_INMEM)) {
      errno = ENOENT;
      return (-1);
   }
   return (t->bt_fd);
}

__bt_open()

DB* __bt_open	(	char *	fname,
		int	flags,
		int	mode,
		const BTREEINFO *	openinfo,
		int	dflags
	)		const

Definition at line 90 of file bt_open.c.

References __bt_close(), __bt_defcmp(), __bt_defpfx(), __bt_delete(), __bt_fd(), __bt_get(), __bt_pgin(), __bt_pgout(), __bt_put(), __bt_seq(), __bt_sync(), b, B_DB_LOCK, B_DB_SHMEM, B_DB_TXN, B_INMEM, B_METADIRTY, B_NEEDSWAP, B_NODUPS, B_RDONLY, BIG_ENDIAN, _btree::bt_dbp, _btree::bt_fd, _btree::bt_free, _btree::bt_lorder, _btree::bt_mp, _btree::bt_nrecs, _btree::bt_order, _btree::bt_ovflsize, _btree::bt_psize, _btree::bt_rfd, BTDATAOFF, BTREEMAGIC, BTREEVERSION, byteorder(), BTREEINFO::cachesize, DB_BTREE, DB_LOCK, DB_SHMEM, DB_TXN, dbp, DEFMINKEYPAGE, EFTYPE, errno, F_CLR, F_ISSET, F_SET, BTREEINFO::flags, _btree::flags, free(), __db::internal, LITTLE_ENDIAN, BTREEINFO::lorder, malloc(), MAX_PAGE_OFFSET, MINCACHE, BTREEINFO::minkeypage, MINPSIZE, mpool_filter(), mpool_open(), NBLEAFDBT, NOVFLSIZE, nroot(), NULL, P_INVALID, BTREEINFO::psize, R_DUP, RET_ERROR, SAVEMETA, tmp(), and __db::type.

Referenced by __rec_open(), and dbopen().

{
   struct stat sb;
   BTMETA m;
   BTREE *t;
   BTREEINFO b;
   DB *dbp;
   pgno_t ncache;
   ssize_t nr;
   int machine_lorder;

   t = NULL;

   /*
    * Intention is to make sure all of the user's selections are okay
    * here and then use them without checking.  Can't be complete, since
    * we don't know the right page size, lorder or flags until the backing
    * file is opened.  Also, the file's page size can cause the cachesize
    * to change.
    */
   machine_lorder = byteorder();
   if (openinfo) {
      b = *openinfo;

      /* Flags: R_DUP. */
      if (b.flags & ~(R_DUP))
         goto einval;

      /*
       * Page size must be indx_t aligned and >= MINPSIZE.  Default
       * page size is set farther on, based on the underlying file
       * transfer size.
       */
      if (b.psize &&
          (b.psize < MINPSIZE || b.psize > MAX_PAGE_OFFSET + 1 ||
          b.psize & (sizeof(indx_t) - 1)))
         goto einval;

      /* Minimum number of keys per page; absolute minimum is 2. */
      if (b.minkeypage) {
         if (b.minkeypage < 2)
            goto einval;
      } else
         b.minkeypage = DEFMINKEYPAGE;

      /* If no comparison, use default comparison and prefix. */
      if (b.compare == NULL) {
         b.compare = __bt_defcmp;
         if (b.prefix == NULL)
            b.prefix = __bt_defpfx;
      }

      if (b.lorder == 0)
         b.lorder = machine_lorder;
   } else {
      b.compare = __bt_defcmp;
      b.cachesize = 0;
      b.flags = 0;
      b.lorder = machine_lorder;
      b.minkeypage = DEFMINKEYPAGE;
      b.prefix = __bt_defpfx;
      b.psize = 0;
   }

   /* Check for the ubiquitous PDP-11. */
   if (b.lorder != BIG_ENDIAN && b.lorder != LITTLE_ENDIAN)
      goto einval;

   /* Allocate and initialize DB and BTREE structures. */
   if ((t = (BTREE *)malloc(sizeof(BTREE))) == NULL)
      goto err;
   memset(t, 0, sizeof(BTREE));
   t->bt_fd = -1;       /* Don't close unopened fd on error. */
   t->bt_lorder = b.lorder;
   t->bt_order = NOT;
   t->bt_cmp = b.compare;
   t->bt_pfx = b.prefix;
   t->bt_rfd = -1;

   if ((t->bt_dbp = dbp = (DB *)malloc(sizeof(DB))) == NULL)
      goto err;
   memset(t->bt_dbp, 0, sizeof(DB));
   if (t->bt_lorder != machine_lorder)
      F_SET(t, B_NEEDSWAP);

   dbp->type = DB_BTREE;
   dbp->internal = t;
   dbp->close = __bt_close;
   dbp->del = __bt_delete;
   dbp->fd = __bt_fd;
   dbp->get = __bt_get;
   dbp->put = __bt_put;
   dbp->seq = __bt_seq;
   dbp->sync = __bt_sync;

   /*
    * If no file name was supplied, this is an in-memory btree and we
    * open a backing temporary file.  Otherwise, it's a disk-based tree.
    */
   if (fname) {
      switch (flags & O_ACCMODE) {
      case O_RDONLY:
         F_SET(t, B_RDONLY);
         break;
      case O_RDWR:
         break;
      case O_WRONLY:
      default:
         goto einval;
      }

      if ((t->bt_fd = open(fname, flags, mode)) < 0)
         goto err;

   } else {
      if ((flags & O_ACCMODE) != O_RDWR)
         goto einval;
      if ((t->bt_fd = tmp()) == -1)
         goto err;
      F_SET(t, B_INMEM);
   }

   if (fcntl(t->bt_fd, F_SETFD, 1) == -1)
      goto err;

   if (fstat(t->bt_fd, &sb))
      goto err;
   if (sb.st_size) {
      if ((nr = read(t->bt_fd, &m, sizeof(BTMETA))) < 0)
         goto err;
      if (nr != sizeof(BTMETA))
         goto eftype;

      /*
       * Read in the meta-data.  This can change the notion of what
       * the lorder, page size and flags are, and, when the page size
       * changes, the cachesize value can change too.  If the user
       * specified the wrong byte order for an existing database, we
       * don't bother to return an error, we just clear the NEEDSWAP
       * bit.
       */
      if (m.magic == BTREEMAGIC)
         F_CLR(t, B_NEEDSWAP);
      else {
         F_SET(t, B_NEEDSWAP);
         M_32_SWAP(m.magic);
         M_32_SWAP(m.version);
         M_32_SWAP(m.psize);
         M_32_SWAP(m.free);
         M_32_SWAP(m.nrecs);
         M_32_SWAP(m.flags);
      }
      if (m.magic != BTREEMAGIC || m.version != BTREEVERSION)
         goto eftype;
      if (m.psize < MINPSIZE || m.psize > MAX_PAGE_OFFSET + 1 ||
          m.psize & (sizeof(indx_t) - 1))
         goto eftype;
      if (m.flags & ~SAVEMETA)
         goto eftype;
      b.psize = m.psize;
      F_SET(t, m.flags);
      t->bt_free = m.free;
      t->bt_nrecs = m.nrecs;
   } else {
      /*
       * Set the page size to the best value for I/O to this file.
       * Don't overflow the page offset type.
       */
      if (b.psize == 0) {
#ifdef _STATBUF_ST_BLKSIZE
         b.psize = sb.st_blksize;
#endif
         if (b.psize < MINPSIZE)
            b.psize = MINPSIZE;
         if (b.psize > MAX_PAGE_OFFSET + 1)
            b.psize = MAX_PAGE_OFFSET + 1;
      }

      /* Set flag if duplicates permitted. */
      if (!(b.flags & R_DUP))
         F_SET(t, B_NODUPS);

      t->bt_free = P_INVALID;
      t->bt_nrecs = 0;
      F_SET(t, B_METADIRTY);
   }

   t->bt_psize = b.psize;

   /* Set the cache size; must be a multiple of the page size. */
   if (b.cachesize && b.cachesize & (b.psize - 1))
      b.cachesize += (~b.cachesize & (b.psize - 1)) + 1;
   if (b.cachesize < b.psize * MINCACHE)
      b.cachesize = b.psize * MINCACHE;

   /* Calculate number of pages to cache. */
   ncache = (b.cachesize + t->bt_psize - 1) / t->bt_psize;

   /*
    * The btree data structure requires that at least two keys can fit on
    * a page, but other than that there's no fixed requirement.  The user
    * specified a minimum number per page, and we translated that into the
    * number of bytes a key/data pair can use before being placed on an
    * overflow page.  This calculation includes the page header, the size
    * of the index referencing the leaf item and the size of the leaf item
    * structure.  Also, don't let the user specify a minkeypage such that
    * a key/data pair won't fit even if both key and data are on overflow
    * pages.
    */
   t->bt_ovflsize = (t->bt_psize - BTDATAOFF) / b.minkeypage -
       (sizeof(indx_t) + NBLEAFDBT(0, 0));
   if (t->bt_ovflsize < NBLEAFDBT(NOVFLSIZE, NOVFLSIZE) + sizeof(indx_t))
      t->bt_ovflsize =
          NBLEAFDBT(NOVFLSIZE, NOVFLSIZE) + sizeof(indx_t);

   /* Initialize the buffer pool. */
   if ((t->bt_mp =
       mpool_open(NULL, t->bt_fd, t->bt_psize, ncache)) == NULL)
      goto err;
   if (!F_ISSET(t, B_INMEM))
      mpool_filter(t->bt_mp, __bt_pgin, __bt_pgout, t);

   /* Create a root page if new tree. */
   if (nroot(t) == RET_ERROR)
      goto err;

   /* Global flags. */
   if (dflags & DB_LOCK)
      F_SET(t, B_DB_LOCK);
   if (dflags & DB_SHMEM)
      F_SET(t, B_DB_SHMEM);
   if (dflags & DB_TXN)
      F_SET(t, B_DB_TXN);

   return (dbp);

einval:  errno = EINVAL;
   goto err;

eftype:  errno = EFTYPE;
   goto err;

err:  if (t) {
      if (t->bt_dbp)
         free(t->bt_dbp);
      if (t->bt_fd != -1)
         (void)close(t->bt_fd);
      free(t);
   }
   return (NULL);
}

__P() [1/2]

static int tmp __P ( (void)  )

static

__P() [2/2]

static int nroot __P ( (BTREE *)  )

static

byteorder()

static int byteorder ( )

static

Definition at line 421 of file bt_open.c.

References BIG_ENDIAN, and LITTLE_ENDIAN.

Referenced by __bt_open().

{
   u_int32_t x;
   u_char *p;

   x = 0x01020304;
   p = (u_char *)&x;
   switch (*p) {
   case 1:
      return (BIG_ENDIAN);
   case 4:
      return (LITTLE_ENDIAN);
   default:
      return (0);
   }
}

nroot()

static int nroot ( BTREE *  t )

static

Definition at line 355 of file bt_open.c.

References _btree::bt_mp, _btree::bt_psize, BTDATAOFF, errno, _page::flags, _page::lower, env::meta, MPOOL_DIRTY, mpool_get(), mpool_new(), mpool_put(), _page::nextpg, NULL, P_BLEAF, P_INVALID, P_ROOT, _page::pgno, _page::prevpg, RET_ERROR, RET_SUCCESS, and _page::upper.

Referenced by __bt_open().

{
   PAGE *meta, *root;
   pgno_t npg;

   if ((meta = mpool_get(t->bt_mp, 0, 0)) != NULL) {
      mpool_put(t->bt_mp, meta, 0);
      return (RET_SUCCESS);
   }
   if (errno != EINVAL)    /* It's OK to not exist. */
      return (RET_ERROR);
   errno = 0;

   if ((meta = mpool_new(t->bt_mp, &npg)) == NULL)
      return (RET_ERROR);

   if ((root = mpool_new(t->bt_mp, &npg)) == NULL)
      return (RET_ERROR);

   if (npg != P_ROOT)
      return (RET_ERROR);
   root->pgno = npg;
   root->prevpg = root->nextpg = P_INVALID;
   root->lower = BTDATAOFF;
   root->upper = t->bt_psize;
   root->flags = P_BLEAF;
   memset(meta, 0, t->bt_psize);
   mpool_put(t->bt_mp, meta, MPOOL_DIRTY);
   mpool_put(t->bt_mp, root, MPOOL_DIRTY);
   return (RET_SUCCESS);
}

tmp()

static int tmp ( )

static

Examples:

/usr/src/asterisk-18.5.0/main/app.c.

Definition at line 389 of file bt_open.c.

References free(), malloc(), and NULL.

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append_int(), append_mailbox(), aqm_exec(), ast_add_extension2(), ast_add_extension2_lockopt(), ast_alertpipe_flush(), ast_alertpipe_read(), ast_alertpipe_write(), ast_app_group_split_group(), ast_append_acl(), ast_ari_asterisk_get_global_var(), ast_bucket_alloc(), ast_bucket_file_alloc(), ast_callerid_parse(), ast_callerid_split(), ast_callid_threadstorage_auto(), ast_cli_command_full(), ast_config_hook_unregister(), ast_config_option(), ast_context_find(), ast_context_find_or_create(), ast_format_def_unregister(), ast_get_enum(), ast_get_hint(), ast_hashtab_hash_string(), ast_hashtab_hash_string_nocase(), ast_iax2_new(), ast_jb_read_conf(), ast_loader_register(), ast_media_cache_create_or_update(), ast_merge_contexts_and_delete(), ast_mkdir(), ast_monitor_stop(), ast_privacy_check(), ast_privacy_set(), ast_read_image(), ast_register_application2(), ast_register_switch(), ast_remotecontrol(), ast_sched_add_variable(), ast_sched_context_create(), ast_sip_create_dialog_uac(), ast_sip_create_rdata_with_contact(), ast_sip_set_outbound_proxy(), ast_sorcery_changeset_create(), ast_sorcery_objectset_create2(), ast_sorcery_objectset_json_create(), ast_srtp_policy_alloc(), ast_str_encode_mime(), ast_str_get_hint(), ast_strftime_locale(), AST_TEST_DEFINE(), ast_unregister_translator(), ast_uri_decode(), ast_utf8_validator_new(), ast_variables_dup(), ast_xmldoc_printable(), auth_exec(), background_detect_exec(), bucket_file_wizard_retrieve(), bucket_wizard_retrieve(), build_channels(), build_contact(), build_peer(), build_radius_record(), build_rand_pad(), build_secret(), cache_lookup(), caldav_add_event(), calendar_join_attendees(), callstate2str(), cb_events(), cdr_handler(), chan_misdn_log(), channel_spy(), chanspy_exec(), check_peer_ok(), check_user_full(), check_via(), cli_fax_show_session(), cli_prompt(), cli_show_module_options(), cli_show_module_type(), cli_show_module_types(), codec2_destroy_stuff(), codec2_new(), codec2tolin_framein(), common_exec(), 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odbc_log(), ogg_vorbis_rewrite(), ooh323_request(), open_history(), optimize_transactions(), osp_create_uuid(), osp_get_varfloat(), osp_get_varint(), osp_lookup(), osp_report_qos(), ospauth_exec(), ospfinished_exec(), osplookup_exec(), ospnext_exec(), P2(), page_exec(), parse_hint_device(), parse_hint_presence(), parse_tag(), parse_uri_cb(), pbx_builtin_importvar(), pbx_builtin_saynumber(), pbx_extension_helper(), pbx_find_extension(), pbx_load_users(), pbx_outgoing_attempt(), pbx_substitute_variables_helper_full(), peer_set_srcaddr(), phone_new(), phone_request(), playback_exec(), presence_write(), process_dahdi(), process_my_load_module(), process_sdp_a_audio(), prov_ver_calc(), pw_cb(), random_binaural_pos_change(), rcv_mac_addr(), read_exec(), read_mf_exec(), read_sf_exec(), realtime_directory(), realtime_ldap_base_ap(), realtime_ldap_result_to_vars(), realtime_peer(), realtime_peer_by_name(), realtime_user(), rebuild_channels(), record_exec(), register_verify(), reload_config(), 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xmldoc_reverse_helper(), xmldoc_string_wrap(), and xmldoc_update_config_type().

{
   sigset_t set, oset;
   int fd;
   const char *envtmp;
   char *path;
   static const char fmt[] = "%s/bt.XXXXXX";
   size_t n;

   envtmp = getenv("TMPDIR");
   if (!envtmp)
     envtmp = "/tmp";
   n = strlen (envtmp) + sizeof fmt;
#ifdef   __GNUC__
   path = __builtin_alloca(n);
#else
   path = malloc(n);
#endif
   (void)snprintf(path, n, fmt, envtmp ? envtmp : "/tmp");

   (void)sigfillset(&set);
   (void)sigprocmask(SIG_BLOCK, &set, &oset);
   if ((fd = mkstemp(path)) != -1)
      (void)unlink(path);
   (void)sigprocmask(SIG_SETMASK, &oset, NULL);
#ifndef  __GNUC__
   free(path);
#endif
   return(fd);
}