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169 lines
3.4 KiB
C
169 lines
3.4 KiB
C
/* id.c - keep track of the next id to be given out */
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#include "portable.h"
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#include <stdio.h>
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#include <ac/socket.h>
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#include "slap.h"
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#include "back-bdb2.h"
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/* XXX the separate handling of the NEXTID file is in contrast to TP */
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/* the NEXTID file is beeing opened during database start-up */
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static ID
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next_id_read( BackendDB *be )
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{
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struct ldbminfo *li = (struct ldbminfo *) be->be_private;
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BDB2_TXN_HEAD *head = &li->li_txn_head;
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FILE* fp = head->nextidFP;
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ID id;
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char buf[20];
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/* set the file pointer to the beginnig of the file */
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rewind( fp );
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/* read the nextid */
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if ( fgets( buf, sizeof(buf), fp ) == NULL ) {
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Debug( LDAP_DEBUG_ANY,
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"next_id_read: could not fgets nextid from \"%s\"\n",
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li->li_nextid_file, 0, 0 );
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return NOID;
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}
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id = atol( buf );
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if(id < 1) {
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Debug( LDAP_DEBUG_ANY,
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"next_id_read %ld: atol(%s) return non-positive integer\n",
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id, buf, 0 );
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return NOID;
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}
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return id;
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}
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/* XXX the separate handling of the NEXTID file is in contrast to TP */
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/* the NEXTID file is beeing opened during database start-up */
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static int
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next_id_write( BackendDB *be, ID id )
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{
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struct ldbminfo *li = (struct ldbminfo *) be->be_private;
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BDB2_TXN_HEAD *head = &li->li_txn_head;
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FILE* fp = head->nextidFP;
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char buf[20];
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int rc = 0;
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/* set the file pointer to the beginnig of the file */
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rewind( fp );
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/* write the nextid */
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if ( fprintf( fp, "%ld\n", id ) == EOF ) {
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Debug( LDAP_DEBUG_ANY, "next_id_write(%ld): cannot fprintf\n",
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id, 0, 0 );
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rc = -1;
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}
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/* if forced flushing of files is in effect, do so */
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if( li->li_dbcachewsync && ( fflush( fp ) != 0 )) {
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Debug( LDAP_DEBUG_ANY, "next_id_write %ld: cannot fflush\n",
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id, 0, 0 );
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rc = -1;
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}
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return rc;
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}
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int
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bdb2i_next_id_save( BackendDB *be )
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{
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struct ldbminfo *li = (struct ldbminfo *) be->be_private;
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ID id = bdb2i_next_id_get( be );
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int rc = next_id_write( be, id );
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if (rc == 0) {
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li->li_nextid_wrote = id;
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}
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return rc;
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}
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ID
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bdb2i_next_id( BackendDB *be )
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{
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struct ldbminfo *li = (struct ldbminfo *) be->be_private;
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ID id;
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/* first time in here since startup - try to read the nexid */
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if ( li->li_nextid == NOID ) {
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li->li_nextid = next_id_read( be );
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if ( li->li_nextid == NOID ) {
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li->li_nextid = 1;
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}
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#if SLAPD_NEXTID_CHUNK > 1
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li->li_nextid_wrote = li->li_nextid;
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#endif
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}
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id = li->li_nextid++;
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#if SLAPD_NEXTID_CHUNK > 1
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if ( li->li_nextid > li->li_nextid_wrote ) {
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li->li_nextid_wrote += SLAPD_NEXTID_CHUNK;
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(void) next_id_write( be, li->li_nextid_wrote );
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}
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#else
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(void) next_id_write( be, li->li_nextid );
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#endif
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return( id );
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}
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void
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bdb2i_next_id_return( BackendDB *be, ID id )
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{
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#ifdef SLAPD_NEXTID_RETURN
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struct ldbminfo *li = (struct ldbminfo *) be->be_private;
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if ( id != li->li_nextid - 1 ) {
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return;
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}
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li->li_nextid--;
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#if !( SLAPD_NEXTID_CHUCK > 1 )
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(void) next_id_write( be, li->li_nextid );
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#endif
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#endif
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}
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ID
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bdb2i_next_id_get( BackendDB *be )
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{
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struct ldbminfo *li = (struct ldbminfo *) be->be_private;
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ID id;
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/* first time in here since startup - try to read the nexid */
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if ( li->li_nextid == NOID ) {
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li->li_nextid = next_id_read( be );
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if ( li->li_nextid == NOID ) {
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li->li_nextid = 1;
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}
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#if SLAPD_NEXTID_CHUNK > 1
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li->li_nextid_wrote = li->li_nextid;
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#endif
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}
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id = li->li_nextid;
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return( id );
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}
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