.TH "mdb.c" 3 "Wed May 18 2016" "LMDB" \" -*- nroff -*-
.ad l
.nh
.SH NAME
mdb.c \- 
.PP
Lightning memory-mapped database library\&.  

.SH SYNOPSIS
.br
.PP
\fC#include <sys/types\&.h>\fP
.br
\fC#include <sys/stat\&.h>\fP
.br
\fC#include <sys/param\&.h>\fP
.br
\fC#include <sys/uio\&.h>\fP
.br
\fC#include <sys/mman\&.h>\fP
.br
\fC#include <fcntl\&.h>\fP
.br
\fC#include <errno\&.h>\fP
.br
\fC#include <limits\&.h>\fP
.br
\fC#include <stddef\&.h>\fP
.br
\fC#include <inttypes\&.h>\fP
.br
\fC#include <stdio\&.h>\fP
.br
\fC#include <stdlib\&.h>\fP
.br
\fC#include <string\&.h>\fP
.br
\fC#include <time\&.h>\fP
.br
\fC#include <unistd\&.h>\fP
.br
\fC#include <netinet/in\&.h>\fP
.br
\fC#include <resolv\&.h>\fP
.br
\fC#include <pthread\&.h>\fP
.br
\fC#include 'lmdb\&.h'\fP
.br
\fC#include 'midl\&.h'\fP
.br

.SS "Data Structures"

.in +1c
.ti -1c
.RI "struct \fBMDB_rxbody\fP"
.br
.ti -1c
.RI "struct \fBMDB_reader\fP"
.br
.ti -1c
.RI "struct \fBMDB_txbody\fP"
.br
.ti -1c
.RI "struct \fBMDB_txninfo\fP"
.br
.ti -1c
.RI "struct \fBMDB_page\fP"
.br
.ti -1c
.RI "struct \fBMDB_node\fP"
.br
.ti -1c
.RI "struct \fBMDB_db\fP"
.br
.ti -1c
.RI "struct \fBMDB_meta\fP"
.br
.ti -1c
.RI "union \fBMDB_metabuf\fP"
.br
.ti -1c
.RI "struct \fBMDB_dbx\fP"
.br
.ti -1c
.RI "struct \fBMDB_txn\fP"
.br
.RI "\fIOpaque structure for a transaction handle\&. \fP"
.ti -1c
.RI "struct \fBMDB_cursor\fP"
.br
.RI "\fIOpaque structure for navigating through a database\&. \fP"
.ti -1c
.RI "struct \fBMDB_xcursor\fP"
.br
.ti -1c
.RI "struct \fBMDB_pgstate\fP"
.br
.ti -1c
.RI "struct \fBMDB_env\fP"
.br
.RI "\fIOpaque structure for a database environment\&. \fP"
.ti -1c
.RI "struct \fBMDB_ntxn\fP"
.br
.ti -1c
.RI "struct \fBmdb_copy\fP"
.br
.in -1c
.SS "Macros"

.in +1c
.ti -1c
.RI "#define \fB_GNU_SOURCE\fP   1"
.br
.ti -1c
.RI "#define \fBMDB_PID_T\fP   pid_t"
.br
.ti -1c
.RI "#define \fBMDB_THR_T\fP   pthread_t"
.br
.ti -1c
.RI "#define \fBCACHEFLUSH\fP(addr, bytes, cache)"
.br
.ti -1c
.RI "#define \fBMDB_USE_POSIX_MUTEX\fP   1"
.br
.ti -1c
.RI "#define \fBVGMEMP_CREATE\fP(h, r, z)"
.br
.ti -1c
.RI "#define \fBVGMEMP_ALLOC\fP(h, a, s)"
.br
.ti -1c
.RI "#define \fBVGMEMP_FREE\fP(h, a)"
.br
.ti -1c
.RI "#define \fBVGMEMP_DESTROY\fP(h)"
.br
.ti -1c
.RI "#define \fBVGMEMP_DEFINED\fP(a, s)"
.br
.ti -1c
.RI "#define \fBBYTE_ORDER\fP   __BYTE_ORDER"
.br
.ti -1c
.RI "#define \fBLITTLE_ENDIAN\fP   __LITTLE_ENDIAN"
.br
.ti -1c
.RI "#define \fBBIG_ENDIAN\fP   __BIG_ENDIAN"
.br
.ti -1c
.RI "#define \fBESECT\fP   __attribute__ ((section('text_env')))"
.br
.ti -1c
.RI "#define \fBCALL_CONV\fP"
.br
.ti -1c
.RI "#define \fBMDB_DEVEL\fP   0"
.br
.ti -1c
.RI "#define \fBmdb_func_\fP   '<mdb_unknown>'"
.br
.ti -1c
.RI "#define \fBMDB_NO_ROOT\fP   (\fBMDB_LAST_ERRCODE\fP + 10)"
.br
.ti -1c
.RI "#define \fBMDB_USE_ROBUST\fP   1"
.br
.ti -1c
.RI "#define \fBTHREAD_RET\fP   void *"
.br
.ti -1c
.RI "#define \fBTHREAD_CREATE\fP(thr, start, arg)   pthread_create(&thr,NULL,start,arg)"
.br
.ti -1c
.RI "#define \fBTHREAD_FINISH\fP(thr)   pthread_join(thr,NULL)"
.br
.ti -1c
.RI "#define \fBZ\fP   'z'"
.br
.ti -1c
.RI "#define \fBMDB_PIDLOCK\fP   1"
.br
.ti -1c
.RI "#define \fBLOCK_MUTEX0\fP(mutex)   pthread_mutex_lock(mutex)"
.br
.ti -1c
.RI "#define \fBUNLOCK_MUTEX\fP(mutex)   pthread_mutex_unlock(mutex)"
.br
.ti -1c
.RI "#define \fBmdb_mutex_consistent\fP(mutex)   pthread_mutex_consistent(mutex)"
.br
.ti -1c
.RI "#define \fBErrCode\fP()   errno"
.br
.ti -1c
.RI "#define \fBHANDLE\fP   int"
.br
.ti -1c
.RI "#define \fBINVALID_HANDLE_VALUE\fP   (-1)"
.br
.ti -1c
.RI "#define \fBGET_PAGESIZE\fP(x)   ((x) = sysconf(_SC_PAGE_SIZE))"
.br
.ti -1c
.RI "#define \fBMNAME_LEN\fP   (sizeof(pthread_mutex_t))"
.br
.ti -1c
.RI "#define \fBLOCK_MUTEX\fP(rc, env, mutex)   ((rc) = \fBLOCK_MUTEX0\fP(mutex))"
.br
.ti -1c
.RI "#define \fBmdb_mutex_failed\fP(env, mutex, rc)   (rc)"
.br
.ti -1c
.RI "#define \fBMDB_DSYNC\fP   O_SYNC"
.br
.ti -1c
.RI "#define \fBMDB_FDATASYNC\fP   fdatasync"
.br
.ti -1c
.RI "#define \fBMDB_MSYNC\fP(addr, len, flags)   msync(addr,len,flags)"
.br
.ti -1c
.RI "#define \fBMS_SYNC\fP   1"
.br
.ti -1c
.RI "#define \fBMS_ASYNC\fP   0"
.br
.ti -1c
.RI "#define \fBMDB_DEBUG\fP   0"
.br
.ti -1c
.RI "#define \fBDPRINTF\fP(args)   ((void) 0)"
.br
.ti -1c
.RI "#define \fBDPUTS\fP(arg)   DPRINTF(('%s', arg))"
.br
.ti -1c
.RI "#define \fBDDBI\fP(mc)   (((mc)->mc_flags & \fBC_SUB\fP) ? -(int)(mc)->mc_dbi : (int)(mc)->mc_dbi)"
.br
.ti -1c
.RI "#define \fBMAX_PAGESIZE\fP   (\fBPAGEBASE\fP ? 0x10000 : 0x8000)"
.br
.RI "\fIThe maximum size of a database page\&. \fP"
.ti -1c
.RI "#define \fBMDB_MINKEYS\fP   2"
.br
.ti -1c
.RI "#define \fBMDB_MAGIC\fP   0xBEEFC0DE"
.br
.ti -1c
.RI "#define \fBMDB_DATA_VERSION\fP   ((\fBMDB_DEVEL\fP) ? 999 : 1)"
.br
.ti -1c
.RI "#define \fBMDB_LOCK_VERSION\fP   1"
.br
.ti -1c
.RI "#define \fBMDB_MAXKEYSIZE\fP   ((\fBMDB_DEVEL\fP) ? 0 : 511)"
.br
.RI "\fIThe max size of a key we can write, or 0 for computed max\&. \fP"
.ti -1c
.RI "#define \fBENV_MAXKEY\fP(env)   (\fBMDB_MAXKEYSIZE\fP)"
.br
.ti -1c
.RI "#define \fBMAXDATASIZE\fP   0xffffffffUL"
.br
.RI "\fIThe maximum size of a data item\&. \fP"
.ti -1c
.RI "#define \fBDKBUF\fP"
.br
.ti -1c
.RI "#define \fBDKEY\fP(x)   0"
.br
.ti -1c
.RI "#define \fBP_INVALID\fP   (~(\fBpgno_t\fP)0)"
.br
.ti -1c
.RI "#define \fBF_ISSET\fP(w, f)   (((w) & (f)) == (f))"
.br
.ti -1c
.RI "#define \fBEVEN\fP(n)   (((n) + 1U) & -2) /* sign-extending -2 to match n+1U */"
.br
.ti -1c
.RI "#define \fBDEFAULT_MAPSIZE\fP   1048576"
.br
.ti -1c
.RI "#define \fBDEFAULT_READERS\fP   126"
.br
.ti -1c
.RI "#define \fBCACHELINE\fP   64"
.br
.ti -1c
.RI "#define \fBmr_txnid\fP   mru\&.mrx\&.mrb_txnid"
.br
.ti -1c
.RI "#define \fBmr_pid\fP   mru\&.mrx\&.mrb_pid"
.br
.ti -1c
.RI "#define \fBmr_tid\fP   mru\&.mrx\&.mrb_tid"
.br
.ti -1c
.RI "#define \fBmti_magic\fP   mt1\&.mtb\&.mtb_magic"
.br
.ti -1c
.RI "#define \fBmti_format\fP   mt1\&.mtb\&.mtb_format"
.br
.ti -1c
.RI "#define \fBmti_rmutex\fP   mt1\&.mtb\&.mtb_rmutex"
.br
.ti -1c
.RI "#define \fBmti_rmname\fP   mt1\&.mtb\&.mtb_rmname"
.br
.ti -1c
.RI "#define \fBmti_txnid\fP   mt1\&.mtb\&.mtb_txnid"
.br
.ti -1c
.RI "#define \fBmti_numreaders\fP   mt1\&.mtb\&.mtb_numreaders"
.br
.ti -1c
.RI "#define \fBmti_wmutex\fP   mt2\&.mt2_wmutex"
.br
.ti -1c
.RI "#define \fBMDB_LOCK_FORMAT\fP"
.br
.ti -1c
.RI "#define \fBmp_pgno\fP   mp_p\&.p_pgno"
.br
.ti -1c
.RI "#define \fBmp_next\fP   mp_p\&.p_next"
.br
.ti -1c
.RI "#define \fBP_BRANCH\fP   0x01"
.br
.ti -1c
.RI "#define \fBP_LEAF\fP   0x02"
.br
.ti -1c
.RI "#define \fBP_OVERFLOW\fP   0x04"
.br
.ti -1c
.RI "#define \fBP_META\fP   0x08"
.br
.ti -1c
.RI "#define \fBP_DIRTY\fP   0x10"
.br
.ti -1c
.RI "#define \fBP_LEAF2\fP   0x20"
.br
.ti -1c
.RI "#define \fBP_SUBP\fP   0x40"
.br
.ti -1c
.RI "#define \fBP_LOOSE\fP   0x4000"
.br
.ti -1c
.RI "#define \fBP_KEEP\fP   0x8000"
.br
.ti -1c
.RI "#define \fBmp_lower\fP   mp_pb\&.pb\&.pb_lower"
.br
.ti -1c
.RI "#define \fBmp_upper\fP   mp_pb\&.pb\&.pb_upper"
.br
.ti -1c
.RI "#define \fBmp_pages\fP   mp_pb\&.pb_pages"
.br
.ti -1c
.RI "#define \fBPAGEHDRSZ\fP   ((unsigned) offsetof(\fBMDB_page\fP, mp_ptrs))"
.br
.ti -1c
.RI "#define \fBMETADATA\fP(p)   ((void *)((char *)(p) + \fBPAGEHDRSZ\fP))"
.br
.ti -1c
.RI "#define \fBPAGEBASE\fP   ((\fBMDB_DEVEL\fP) ? \fBPAGEHDRSZ\fP : 0)"
.br
.ti -1c
.RI "#define \fBNUMKEYS\fP(p)   (((p)->mp_lower - (\fBPAGEHDRSZ\fP-\fBPAGEBASE\fP)) >> 1)"
.br
.ti -1c
.RI "#define \fBSIZELEFT\fP(p)   (\fBindx_t\fP)((p)->mp_upper - (p)->mp_lower)"
.br
.ti -1c
.RI "#define \fBPAGEFILL\fP(env, p)"
.br
.ti -1c
.RI "#define \fBFILL_THRESHOLD\fP   250"
.br
.ti -1c
.RI "#define \fBIS_LEAF\fP(p)   \fBF_ISSET\fP((p)->mp_flags, \fBP_LEAF\fP)"
.br
.ti -1c
.RI "#define \fBIS_LEAF2\fP(p)   \fBF_ISSET\fP((p)->mp_flags, \fBP_LEAF2\fP)"
.br
.ti -1c
.RI "#define \fBIS_BRANCH\fP(p)   \fBF_ISSET\fP((p)->mp_flags, \fBP_BRANCH\fP)"
.br
.ti -1c
.RI "#define \fBIS_OVERFLOW\fP(p)   \fBF_ISSET\fP((p)->mp_flags, \fBP_OVERFLOW\fP)"
.br
.ti -1c
.RI "#define \fBIS_SUBP\fP(p)   \fBF_ISSET\fP((p)->mp_flags, \fBP_SUBP\fP)"
.br
.ti -1c
.RI "#define \fBOVPAGES\fP(size, psize)   ((\fBPAGEHDRSZ\fP-1 + (size)) / (psize) + 1)"
.br
.ti -1c
.RI "#define \fBNEXT_LOOSE_PAGE\fP(p)   (*(\fBMDB_page\fP **)((p) + 2))"
.br
.ti -1c
.RI "#define \fBF_BIGDATA\fP   0x01"
.br
.ti -1c
.RI "#define \fBF_SUBDATA\fP   0x02"
.br
.ti -1c
.RI "#define \fBF_DUPDATA\fP   0x04"
.br
.ti -1c
.RI "#define \fBNODE_ADD_FLAGS\fP   (\fBF_DUPDATA\fP|\fBF_SUBDATA\fP|\fBMDB_RESERVE\fP|\fBMDB_APPEND\fP)"
.br
.ti -1c
.RI "#define \fBNODESIZE\fP   offsetof(\fBMDB_node\fP, mn_data)"
.br
.ti -1c
.RI "#define \fBPGNO_TOPWORD\fP   ((\fBpgno_t\fP)-1 > 0xffffffffu ? 32 : 0)"
.br
.ti -1c
.RI "#define \fBINDXSIZE\fP(k)   (\fBNODESIZE\fP + ((k) == NULL ? 0 : (k)->mv_size))"
.br
.ti -1c
.RI "#define \fBLEAFSIZE\fP(k, d)   (\fBNODESIZE\fP + (k)->mv_size + (d)->mv_size)"
.br
.ti -1c
.RI "#define \fBNODEPTR\fP(p, i)   ((\fBMDB_node\fP *)((char *)(p) + (p)->mp_ptrs[i] + \fBPAGEBASE\fP))"
.br
.ti -1c
.RI "#define \fBNODEKEY\fP(node)   (void *)((node)->mn_data)"
.br
.ti -1c
.RI "#define \fBNODEDATA\fP(node)   (void *)((char *)(node)->mn_data + (node)->mn_ksize)"
.br
.ti -1c
.RI "#define \fBNODEPGNO\fP(node)"
.br
.ti -1c
.RI "#define \fBSETPGNO\fP(node, pgno)"
.br
.ti -1c
.RI "#define \fBNODEDSZ\fP(node)   ((node)->mn_lo | ((unsigned)(node)->mn_hi << 16))"
.br
.ti -1c
.RI "#define \fBSETDSZ\fP(node, size)"
.br
.ti -1c
.RI "#define \fBNODEKSZ\fP(node)   ((node)->mn_ksize)"
.br
.ti -1c
.RI "#define \fBCOPY_PGNO\fP(dst, src)"
.br
.ti -1c
.RI "#define \fBLEAF2KEY\fP(p, i, ks)   ((char *)(p) + \fBPAGEHDRSZ\fP + ((i)*(ks)))"
.br
.ti -1c
.RI "#define \fBMDB_GET_KEY\fP(node, keyptr)"
.br
.ti -1c
.RI "#define \fBMDB_GET_KEY2\fP(node, key)   { key\&.mv_size = \fBNODEKSZ\fP(node); key\&.mv_data = \fBNODEKEY\fP(node); }"
.br
.ti -1c
.RI "#define \fBMDB_VALID\fP   0x8000"
.br
.ti -1c
.RI "#define \fBPERSISTENT_FLAGS\fP   (0xffff & ~(MDB_VALID))"
.br
.ti -1c
.RI "#define \fBVALID_FLAGS\fP"
.br
.ti -1c
.RI "#define \fBFREE_DBI\fP   0"
.br
.ti -1c
.RI "#define \fBMAIN_DBI\fP   1"
.br
.ti -1c
.RI "#define \fBCORE_DBS\fP   2"
.br
.ti -1c
.RI "#define \fBNUM_METAS\fP   2"
.br
.ti -1c
.RI "#define \fBmm_psize\fP   mm_dbs[\fBFREE_DBI\fP]\&.md_pad"
.br
.ti -1c
.RI "#define \fBmm_flags\fP   mm_dbs[\fBFREE_DBI\fP]\&.md_flags"
.br
.ti -1c
.RI "#define \fBDB_DIRTY\fP   0x01"
.br
.ti -1c
.RI "#define \fBDB_STALE\fP   0x02"
.br
.ti -1c
.RI "#define \fBDB_NEW\fP   0x04"
.br
.ti -1c
.RI "#define \fBDB_VALID\fP   0x08"
.br
.ti -1c
.RI "#define \fBDB_USRVALID\fP   0x10"
.br
.ti -1c
.RI "#define \fBMDB_TXN_BEGIN_FLAGS\fP   \fBMDB_RDONLY\fP"
.br
.ti -1c
.RI "#define \fBMDB_TXN_RDONLY\fP   \fBMDB_RDONLY\fP"
.br
.ti -1c
.RI "#define \fBMDB_TXN_WRITEMAP\fP   \fBMDB_WRITEMAP\fP"
.br
.ti -1c
.RI "#define \fBMDB_TXN_FINISHED\fP   0x01"
.br
.ti -1c
.RI "#define \fBMDB_TXN_ERROR\fP   0x02"
.br
.ti -1c
.RI "#define \fBMDB_TXN_DIRTY\fP   0x04"
.br
.ti -1c
.RI "#define \fBMDB_TXN_SPILLS\fP   0x08"
.br
.ti -1c
.RI "#define \fBMDB_TXN_HAS_CHILD\fP   0x10"
.br
.ti -1c
.RI "#define \fBMDB_TXN_BLOCKED\fP   (\fBMDB_TXN_FINISHED\fP|\fBMDB_TXN_ERROR\fP|\fBMDB_TXN_HAS_CHILD\fP)"
.br
.ti -1c
.RI "#define \fBCURSOR_STACK\fP   32"
.br
.ti -1c
.RI "#define \fBC_INITIALIZED\fP   0x01"
.br
.ti -1c
.RI "#define \fBC_EOF\fP   0x02"
.br
.ti -1c
.RI "#define \fBC_SUB\fP   0x04"
.br
.ti -1c
.RI "#define \fBC_DEL\fP   0x08"
.br
.ti -1c
.RI "#define \fBC_UNTRACK\fP   0x40"
.br
.ti -1c
.RI "#define \fBMDB_FATAL_ERROR\fP   0x80000000U"
.br
.ti -1c
.RI "#define \fBMDB_ENV_ACTIVE\fP   0x20000000U"
.br
.ti -1c
.RI "#define \fBMDB_ENV_TXKEY\fP   0x10000000U"
.br
.ti -1c
.RI "#define \fBMDB_FSYNCONLY\fP   0x08000000U"
.br
.ti -1c
.RI "#define \fBme_pglast\fP   me_pgstate\&.mf_pglast"
.br
.ti -1c
.RI "#define \fBme_pghead\fP   me_pgstate\&.mf_pghead"
.br
.ti -1c
.RI "#define \fBme_rmutex\fP   me_txns->mti_rmutex"
.br
.ti -1c
.RI "#define \fBme_wmutex\fP   me_txns->mti_wmutex"
.br
.ti -1c
.RI "#define \fBMDB_COMMIT_PAGES\fP   64"
.br
.ti -1c
.RI "#define \fBMAX_WRITE\fP   (0x40000000U >> (sizeof(ssize_t) == 4))"
.br
.ti -1c
.RI "#define \fBTXN_DBI_EXIST\fP(txn, dbi, validity)   ((txn) && (dbi)<(txn)->mt_numdbs && ((txn)->mt_dbflags[dbi] & (validity)))"
.br
.ti -1c
.RI "#define \fBTXN_DBI_CHANGED\fP(txn, dbi)   ((txn)->mt_dbiseqs[dbi] != (txn)->mt_env->me_dbiseqs[dbi])"
.br
.ti -1c
.RI "#define \fBMDB_END_NAMES\fP"
.br
.ti -1c
.RI "#define \fBMDB_END_OPMASK\fP   0x0F"
.br
.ti -1c
.RI "#define \fBMDB_END_UPDATE\fP   0x10"
.br
.ti -1c
.RI "#define \fBMDB_END_FREE\fP   0x20"
.br
.ti -1c
.RI "#define \fBMDB_END_SLOT\fP   \fBMDB_NOTLS\fP"
.br
.ti -1c
.RI "#define \fBMDB_PS_MODIFY\fP   1"
.br
.ti -1c
.RI "#define \fBMDB_PS_ROOTONLY\fP   2"
.br
.ti -1c
.RI "#define \fBMDB_PS_FIRST\fP   4"
.br
.ti -1c
.RI "#define \fBMDB_PS_LAST\fP   8"
.br
.ti -1c
.RI "#define \fBMDB_SPLIT_REPLACE\fP   \fBMDB_APPENDDUP\fP"
.br
.ti -1c
.RI "#define \fBmdb_env_close0\fP(env, excl)   mdb_env_close1(env)"
.br
.ti -1c
.RI "#define \fBmdb_cmp_clong\fP   \fBmdb_cmp_cint\fP"
.br
.ti -1c
.RI "#define \fBmdb_cassert\fP(mc, expr)   mdb_assert0((mc)->mc_txn->mt_env, expr, #expr)"
.br
.ti -1c
.RI "#define \fBmdb_tassert\fP(txn, expr)   mdb_assert0((txn)->mt_env, expr, #expr)"
.br
.ti -1c
.RI "#define \fBmdb_eassert\fP(env, expr)   mdb_assert0(env, expr, #expr)"
.br
.ti -1c
.RI "#define \fBmdb_assert0\fP(env, expr, expr_txt)"
.br
.ti -1c
.RI "#define \fBDO_PWRITE\fP(rc, fd, ptr, size, len, pos)"
.br
.ti -1c
.RI "#define \fBMDB_ERRCODE_ROFS\fP   EROFS"
.br
.ti -1c
.RI "#define \fBMDB_CLOEXEC\fP   0"
.br
.ti -1c
.RI "#define \fBLOCKNAME\fP   '/lock\&.mdb'"
.br
.ti -1c
.RI "#define \fBDATANAME\fP   '/data\&.mdb'"
.br
.ti -1c
.RI "#define \fBLOCKSUFF\fP   '-lock'"
.br
.ti -1c
.RI "#define \fBCHANGEABLE\fP   (\fBMDB_NOSYNC\fP|\fBMDB_NOMETASYNC\fP|\fBMDB_MAPASYNC\fP|\fBMDB_NOMEMINIT\fP)"
.br
.ti -1c
.RI "#define \fBCHANGELESS\fP"
.br
.ti -1c
.RI "#define \fBMDB_NOSPILL\fP   0x8000"
.br
.ti -1c
.RI "#define \fBWITH_CURSOR_TRACKING\fP(mn, act)"
.br
.ti -1c
.RI "#define \fBMDB_WBUF\fP   (1024*1024)"
.br
.ti -1c
.RI "#define \fBDO_WRITE\fP(rc, fd, ptr, w2, len)   len = write(fd, ptr, w2); rc = (len >= 0)"
.br
.ti -1c
.RI "#define \fBDO_WRITE\fP(rc, fd, ptr, w2, len)   len = write(fd, ptr, w2); rc = (len >= 0)"
.br
.in -1c
.SS "Typedefs"

.in +1c
.ti -1c
.RI "typedef \fBMDB_ID\fP \fBpgno_t\fP"
.br
.ti -1c
.RI "typedef \fBMDB_ID\fP \fBtxnid_t\fP"
.br
.ti -1c
.RI "typedef uint16_t \fBindx_t\fP"
.br
.in -1c
.PP
.RI "\fB\fP"
.br

.in +1c
.in +1c
.ti -1c
.RI "typedef pthread_mutex_t \fBmdb_mutex_t\fP [1]"
.br
.ti -1c
.RI "typedef pthread_mutex_t * \fBmdb_mutexref_t\fP"
.br
.in -1c
.in -1c
.SS "Enumerations"

.in +1c
.ti -1c
.RI "enum { \fBMDB_END_COMMITTED\fP, \fBMDB_END_EMPTY_COMMIT\fP, \fBMDB_END_ABORT\fP, \fBMDB_END_RESET\fP, \fBMDB_END_RESET_TMP\fP, \fBMDB_END_FAIL_BEGIN\fP, \fBMDB_END_FAIL_BEGINCHILD\fP }"
.br
.ti -1c
.RI "enum \fBPidlock_op\fP { \fBPidset\fP = F_SETLK, \fBPidcheck\fP = F_GETLK }"
.br
.in -1c
.SS "Functions"

.in +1c
.ti -1c
.RI "static int \fBmdb_page_alloc\fP (\fBMDB_cursor\fP *mc, int num, \fBMDB_page\fP **mp)"
.br
.ti -1c
.RI "static int \fBmdb_page_new\fP (\fBMDB_cursor\fP *mc, uint32_t flags, int num, \fBMDB_page\fP **mp)"
.br
.ti -1c
.RI "static int \fBmdb_page_touch\fP (\fBMDB_cursor\fP *mc)"
.br
.ti -1c
.RI "static void \fBmdb_txn_end\fP (\fBMDB_txn\fP *txn, unsigned mode)"
.br
.ti -1c
.RI "static int \fBmdb_page_get\fP (\fBMDB_txn\fP *txn, \fBpgno_t\fP pgno, \fBMDB_page\fP **mp, int *lvl)"
.br
.ti -1c
.RI "static int \fBmdb_page_search_root\fP (\fBMDB_cursor\fP *mc, \fBMDB_val\fP *key, int modify)"
.br
.ti -1c
.RI "static int \fBmdb_page_search\fP (\fBMDB_cursor\fP *mc, \fBMDB_val\fP *key, int flags)"
.br
.ti -1c
.RI "static int \fBmdb_page_merge\fP (\fBMDB_cursor\fP *csrc, \fBMDB_cursor\fP *cdst)"
.br
.ti -1c
.RI "static int \fBmdb_page_split\fP (\fBMDB_cursor\fP *mc, \fBMDB_val\fP *newkey, \fBMDB_val\fP *newdata, \fBpgno_t\fP newpgno, unsigned int nflags)"
.br
.ti -1c
.RI "static int \fBmdb_env_read_header\fP (\fBMDB_env\fP *env, \fBMDB_meta\fP *meta)"
.br
.ti -1c
.RI "static \fBMDB_meta\fP * \fBmdb_env_pick_meta\fP (const \fBMDB_env\fP *env)"
.br
.ti -1c
.RI "static int \fBmdb_env_write_meta\fP (\fBMDB_txn\fP *txn)"
.br
.ti -1c
.RI "static void \fBmdb_env_close0\fP (\fBMDB_env\fP *env, int excl)"
.br
.ti -1c
.RI "static \fBMDB_node\fP * \fBmdb_node_search\fP (\fBMDB_cursor\fP *mc, \fBMDB_val\fP *key, int *exactp)"
.br
.ti -1c
.RI "static int \fBmdb_node_add\fP (\fBMDB_cursor\fP *mc, \fBindx_t\fP indx, \fBMDB_val\fP *key, \fBMDB_val\fP *data, \fBpgno_t\fP pgno, unsigned int flags)"
.br
.ti -1c
.RI "static void \fBmdb_node_del\fP (\fBMDB_cursor\fP *mc, int ksize)"
.br
.ti -1c
.RI "static void \fBmdb_node_shrink\fP (\fBMDB_page\fP *mp, \fBindx_t\fP indx)"
.br
.ti -1c
.RI "static int \fBmdb_node_move\fP (\fBMDB_cursor\fP *csrc, \fBMDB_cursor\fP *cdst, int fromleft)"
.br
.ti -1c
.RI "static int \fBmdb_node_read\fP (\fBMDB_txn\fP *txn, \fBMDB_node\fP *leaf, \fBMDB_val\fP *data)"
.br
.ti -1c
.RI "static size_t \fBmdb_leaf_size\fP (\fBMDB_env\fP *env, \fBMDB_val\fP *key, \fBMDB_val\fP *data)"
.br
.ti -1c
.RI "static size_t \fBmdb_branch_size\fP (\fBMDB_env\fP *env, \fBMDB_val\fP *key)"
.br
.ti -1c
.RI "static int \fBmdb_rebalance\fP (\fBMDB_cursor\fP *mc)"
.br
.ti -1c
.RI "static int \fBmdb_update_key\fP (\fBMDB_cursor\fP *mc, \fBMDB_val\fP *key)"
.br
.ti -1c
.RI "static void \fBmdb_cursor_pop\fP (\fBMDB_cursor\fP *mc)"
.br
.ti -1c
.RI "static int \fBmdb_cursor_push\fP (\fBMDB_cursor\fP *mc, \fBMDB_page\fP *mp)"
.br
.ti -1c
.RI "static int \fBmdb_cursor_del0\fP (\fBMDB_cursor\fP *mc)"
.br
.ti -1c
.RI "static int \fBmdb_del0\fP (\fBMDB_txn\fP *txn, \fBMDB_dbi\fP dbi, \fBMDB_val\fP *key, \fBMDB_val\fP *data, unsigned flags)"
.br
.ti -1c
.RI "static int \fBmdb_cursor_sibling\fP (\fBMDB_cursor\fP *mc, int move_right)"
.br
.ti -1c
.RI "static int \fBmdb_cursor_next\fP (\fBMDB_cursor\fP *mc, \fBMDB_val\fP *key, \fBMDB_val\fP *data, \fBMDB_cursor_op\fP op)"
.br
.ti -1c
.RI "static int \fBmdb_cursor_prev\fP (\fBMDB_cursor\fP *mc, \fBMDB_val\fP *key, \fBMDB_val\fP *data, \fBMDB_cursor_op\fP op)"
.br
.ti -1c
.RI "static int \fBmdb_cursor_set\fP (\fBMDB_cursor\fP *mc, \fBMDB_val\fP *key, \fBMDB_val\fP *data, \fBMDB_cursor_op\fP op, int *exactp)"
.br
.ti -1c
.RI "static int \fBmdb_cursor_first\fP (\fBMDB_cursor\fP *mc, \fBMDB_val\fP *key, \fBMDB_val\fP *data)"
.br
.ti -1c
.RI "static int \fBmdb_cursor_last\fP (\fBMDB_cursor\fP *mc, \fBMDB_val\fP *key, \fBMDB_val\fP *data)"
.br
.ti -1c
.RI "static void \fBmdb_cursor_init\fP (\fBMDB_cursor\fP *mc, \fBMDB_txn\fP *txn, \fBMDB_dbi\fP dbi, \fBMDB_xcursor\fP *mx)"
.br
.ti -1c
.RI "static void \fBmdb_xcursor_init0\fP (\fBMDB_cursor\fP *mc)"
.br
.ti -1c
.RI "static void \fBmdb_xcursor_init1\fP (\fBMDB_cursor\fP *mc, \fBMDB_node\fP *node)"
.br
.ti -1c
.RI "static void \fBmdb_xcursor_init2\fP (\fBMDB_cursor\fP *mc, \fBMDB_xcursor\fP *src_mx, int force)"
.br
.ti -1c
.RI "static int \fBmdb_drop0\fP (\fBMDB_cursor\fP *mc, int subs)"
.br
.ti -1c
.RI "static void \fBmdb_default_cmp\fP (\fBMDB_txn\fP *txn, \fBMDB_dbi\fP dbi)"
.br
.ti -1c
.RI "static int \fBmdb_reader_check0\fP (\fBMDB_env\fP *env, int rlocked, int *dead)"
.br
.ti -1c
.RI "char *\fBESECT\fP \fBmdb_version\fP (int *major, int *minor, int *patch)"
.br
.RI "\fIReturn the LMDB library version information\&. \fP"
.ti -1c
.RI "char * \fBmdb_strerror\fP (int err)"
.br
.RI "\fIReturn a string describing a given error code\&. \fP"
.ti -1c
.RI "static void \fBESECT\fP \fBmdb_assert_fail\fP (\fBMDB_env\fP *env, const char *expr_txt, const char *func, const char *file, int line)"
.br
.ti -1c
.RI "int \fBmdb_cmp\fP (\fBMDB_txn\fP *txn, \fBMDB_dbi\fP dbi, const \fBMDB_val\fP *a, const \fBMDB_val\fP *b)"
.br
.RI "\fICompare two data items according to a particular database\&. \fP"
.ti -1c
.RI "int \fBmdb_dcmp\fP (\fBMDB_txn\fP *txn, \fBMDB_dbi\fP dbi, const \fBMDB_val\fP *a, const \fBMDB_val\fP *b)"
.br
.RI "\fICompare two data items according to a particular database\&. \fP"
.ti -1c
.RI "static \fBMDB_page\fP * \fBmdb_page_malloc\fP (\fBMDB_txn\fP *txn, unsigned num)"
.br
.ti -1c
.RI "static void \fBmdb_page_free\fP (\fBMDB_env\fP *env, \fBMDB_page\fP *mp)"
.br
.ti -1c
.RI "static void \fBmdb_dpage_free\fP (\fBMDB_env\fP *env, \fBMDB_page\fP *dp)"
.br
.ti -1c
.RI "static void \fBmdb_dlist_free\fP (\fBMDB_txn\fP *txn)"
.br
.ti -1c
.RI "static int \fBmdb_page_loose\fP (\fBMDB_cursor\fP *mc, \fBMDB_page\fP *mp)"
.br
.ti -1c
.RI "static int \fBmdb_pages_xkeep\fP (\fBMDB_cursor\fP *mc, unsigned pflags, int all)"
.br
.ti -1c
.RI "static int \fBmdb_page_flush\fP (\fBMDB_txn\fP *txn, int keep)"
.br
.ti -1c
.RI "static int \fBmdb_page_spill\fP (\fBMDB_cursor\fP *m0, \fBMDB_val\fP *key, \fBMDB_val\fP *data)"
.br
.ti -1c
.RI "static \fBtxnid_t\fP \fBmdb_find_oldest\fP (\fBMDB_txn\fP *txn)"
.br
.ti -1c
.RI "static void \fBmdb_page_dirty\fP (\fBMDB_txn\fP *txn, \fBMDB_page\fP *mp)"
.br
.ti -1c
.RI "static void \fBmdb_page_copy\fP (\fBMDB_page\fP *dst, \fBMDB_page\fP *src, unsigned int psize)"
.br
.ti -1c
.RI "static int \fBmdb_page_unspill\fP (\fBMDB_txn\fP *txn, \fBMDB_page\fP *mp, \fBMDB_page\fP **ret)"
.br
.ti -1c
.RI "int \fBmdb_env_sync\fP (\fBMDB_env\fP *env, int force)"
.br
.RI "\fIFlush the data buffers to disk\&. \fP"
.ti -1c
.RI "static int \fBmdb_cursor_shadow\fP (\fBMDB_txn\fP *src, \fBMDB_txn\fP *dst)"
.br
.ti -1c
.RI "static void \fBmdb_cursors_close\fP (\fBMDB_txn\fP *txn, unsigned merge)"
.br
.ti -1c
.RI "static int \fBmdb_reader_pid\fP (\fBMDB_env\fP *env, enum Pidlock_op op, MDB_PID_T pid)"
.br
.ti -1c
.RI "static int \fBmdb_txn_renew0\fP (\fBMDB_txn\fP *txn)"
.br
.ti -1c
.RI "int \fBmdb_txn_renew\fP (\fBMDB_txn\fP *txn)"
.br
.RI "\fIRenew a read-only transaction\&. \fP"
.ti -1c
.RI "int \fBmdb_txn_begin\fP (\fBMDB_env\fP *env, \fBMDB_txn\fP *parent, unsigned int flags, \fBMDB_txn\fP **ret)"
.br
.RI "\fICreate a transaction for use with the environment\&. \fP"
.ti -1c
.RI "\fBMDB_env\fP * \fBmdb_txn_env\fP (\fBMDB_txn\fP *txn)"
.br
.RI "\fIReturns the transaction's \fBMDB_env\fP\&. \fP"
.ti -1c
.RI "size_t \fBmdb_txn_id\fP (\fBMDB_txn\fP *txn)"
.br
.RI "\fIReturn the transaction's ID\&. \fP"
.ti -1c
.RI "static void \fBmdb_dbis_update\fP (\fBMDB_txn\fP *txn, int keep)"
.br
.ti -1c
.RI "void \fBmdb_txn_reset\fP (\fBMDB_txn\fP *txn)"
.br
.RI "\fIReset a read-only transaction\&. \fP"
.ti -1c
.RI "void \fBmdb_txn_abort\fP (\fBMDB_txn\fP *txn)"
.br
.RI "\fIAbandon all the operations of the transaction instead of saving them\&. \fP"
.ti -1c
.RI "static int \fBmdb_freelist_save\fP (\fBMDB_txn\fP *txn)"
.br
.ti -1c
.RI "int \fBmdb_txn_commit\fP (\fBMDB_txn\fP *txn)"
.br
.RI "\fICommit all the operations of a transaction into the database\&. \fP"
.ti -1c
.RI "static void \fBESECT\fP \fBmdb_env_init_meta0\fP (\fBMDB_env\fP *env, \fBMDB_meta\fP *meta)"
.br
.ti -1c
.RI "static int \fBESECT\fP \fBmdb_env_init_meta\fP (\fBMDB_env\fP *env, \fBMDB_meta\fP *meta)"
.br
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_create\fP (\fBMDB_env\fP **env)"
.br
.RI "\fICreate an LMDB environment handle\&. \fP"
.ti -1c
.RI "static int \fBESECT\fP \fBmdb_env_map\fP (\fBMDB_env\fP *env, void *addr)"
.br
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_set_mapsize\fP (\fBMDB_env\fP *env, size_t size)"
.br
.RI "\fISet the size of the memory map to use for this environment\&. \fP"
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_set_maxdbs\fP (\fBMDB_env\fP *env, \fBMDB_dbi\fP dbs)"
.br
.RI "\fISet the maximum number of named databases for the environment\&. \fP"
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_set_maxreaders\fP (\fBMDB_env\fP *env, unsigned int readers)"
.br
.RI "\fISet the maximum number of threads/reader slots for the environment\&. \fP"
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_get_maxreaders\fP (\fBMDB_env\fP *env, unsigned int *readers)"
.br
.RI "\fIGet the maximum number of threads/reader slots for the environment\&. \fP"
.ti -1c
.RI "static int \fBESECT\fP \fBmdb_fsize\fP (\fBHANDLE\fP fd, size_t *size)"
.br
.ti -1c
.RI "static int \fBESECT\fP \fBmdb_env_open2\fP (\fBMDB_env\fP *env)"
.br
.ti -1c
.RI "static void \fBmdb_env_reader_dest\fP (void *ptr)"
.br
.ti -1c
.RI "static int \fBESECT\fP \fBmdb_env_share_locks\fP (\fBMDB_env\fP *env, int *excl)"
.br
.ti -1c
.RI "static int \fBESECT\fP \fBmdb_env_excl_lock\fP (\fBMDB_env\fP *env, int *excl)"
.br
.ti -1c
.RI "static int \fBESECT\fP \fBmdb_env_setup_locks\fP (\fBMDB_env\fP *env, char *lpath, int mode, int *excl)"
.br
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_open\fP (\fBMDB_env\fP *env, const char *path, unsigned int flags, \fBmdb_mode_t\fP mode)"
.br
.RI "\fIOpen an environment handle\&. \fP"
.ti -1c
.RI "void \fBESECT\fP \fBmdb_env_close\fP (\fBMDB_env\fP *env)"
.br
.RI "\fIClose the environment and release the memory map\&. \fP"
.ti -1c
.RI "static int \fBmdb_cmp_long\fP (const \fBMDB_val\fP *a, const \fBMDB_val\fP *b)"
.br
.ti -1c
.RI "static int \fBmdb_cmp_int\fP (const \fBMDB_val\fP *a, const \fBMDB_val\fP *b)"
.br
.ti -1c
.RI "static int \fBmdb_cmp_cint\fP (const \fBMDB_val\fP *a, const \fBMDB_val\fP *b)"
.br
.ti -1c
.RI "static int \fBmdb_cmp_memn\fP (const \fBMDB_val\fP *a, const \fBMDB_val\fP *b)"
.br
.ti -1c
.RI "static int \fBmdb_cmp_memnr\fP (const \fBMDB_val\fP *a, const \fBMDB_val\fP *b)"
.br
.ti -1c
.RI "static int \fBmdb_page_search_lowest\fP (\fBMDB_cursor\fP *mc)"
.br
.ti -1c
.RI "static int \fBmdb_ovpage_free\fP (\fBMDB_cursor\fP *mc, \fBMDB_page\fP *mp)"
.br
.ti -1c
.RI "int \fBmdb_get\fP (\fBMDB_txn\fP *txn, \fBMDB_dbi\fP dbi, \fBMDB_val\fP *key, \fBMDB_val\fP *data)"
.br
.RI "\fIGet items from a database\&. \fP"
.ti -1c
.RI "int \fBmdb_cursor_get\fP (\fBMDB_cursor\fP *mc, \fBMDB_val\fP *key, \fBMDB_val\fP *data, \fBMDB_cursor_op\fP op)"
.br
.RI "\fIRetrieve by cursor\&. \fP"
.ti -1c
.RI "static int \fBmdb_cursor_touch\fP (\fBMDB_cursor\fP *mc)"
.br
.ti -1c
.RI "int \fBmdb_cursor_put\fP (\fBMDB_cursor\fP *mc, \fBMDB_val\fP *key, \fBMDB_val\fP *data, unsigned int flags)"
.br
.RI "\fIStore by cursor\&. \fP"
.ti -1c
.RI "int \fBmdb_cursor_del\fP (\fBMDB_cursor\fP *mc, unsigned int flags)"
.br
.RI "\fIDelete current key/data pair\&. \fP"
.ti -1c
.RI "int \fBmdb_cursor_open\fP (\fBMDB_txn\fP *txn, \fBMDB_dbi\fP dbi, \fBMDB_cursor\fP **ret)"
.br
.RI "\fICreate a cursor handle\&. \fP"
.ti -1c
.RI "int \fBmdb_cursor_renew\fP (\fBMDB_txn\fP *txn, \fBMDB_cursor\fP *mc)"
.br
.RI "\fIRenew a cursor handle\&. \fP"
.ti -1c
.RI "int \fBmdb_cursor_count\fP (\fBMDB_cursor\fP *mc, size_t *countp)"
.br
.RI "\fIReturn count of duplicates for current key\&. \fP"
.ti -1c
.RI "void \fBmdb_cursor_close\fP (\fBMDB_cursor\fP *mc)"
.br
.RI "\fIClose a cursor handle\&. \fP"
.ti -1c
.RI "\fBMDB_txn\fP * \fBmdb_cursor_txn\fP (\fBMDB_cursor\fP *mc)"
.br
.RI "\fIReturn the cursor's transaction handle\&. \fP"
.ti -1c
.RI "\fBMDB_dbi\fP \fBmdb_cursor_dbi\fP (\fBMDB_cursor\fP *mc)"
.br
.RI "\fIReturn the cursor's database handle\&. \fP"
.ti -1c
.RI "static void \fBmdb_cursor_copy\fP (const \fBMDB_cursor\fP *csrc, \fBMDB_cursor\fP *cdst)"
.br
.ti -1c
.RI "int \fBmdb_del\fP (\fBMDB_txn\fP *txn, \fBMDB_dbi\fP dbi, \fBMDB_val\fP *key, \fBMDB_val\fP *data)"
.br
.RI "\fIDelete items from a database\&. \fP"
.ti -1c
.RI "int \fBmdb_put\fP (\fBMDB_txn\fP *txn, \fBMDB_dbi\fP dbi, \fBMDB_val\fP *key, \fBMDB_val\fP *data, unsigned int flags)"
.br
.RI "\fIStore items into a database\&. \fP"
.ti -1c
.RI "static THREAD_RET \fBESECT\fP CALL_CONV \fBmdb_env_copythr\fP (void *arg)"
.br
.ti -1c
.RI "static int \fBESECT\fP \fBmdb_env_cthr_toggle\fP (\fBmdb_copy\fP *my, int st)"
.br
.ti -1c
.RI "static int \fBESECT\fP \fBmdb_env_cwalk\fP (\fBmdb_copy\fP *my, \fBpgno_t\fP *pg, int flags)"
.br
.ti -1c
.RI "static int \fBESECT\fP \fBmdb_env_copyfd1\fP (\fBMDB_env\fP *env, \fBHANDLE\fP fd)"
.br
.ti -1c
.RI "static int \fBESECT\fP \fBmdb_env_copyfd0\fP (\fBMDB_env\fP *env, \fBHANDLE\fP fd)"
.br
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_copyfd2\fP (\fBMDB_env\fP *env, \fBHANDLE\fP fd, unsigned int flags)"
.br
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_copyfd\fP (\fBMDB_env\fP *env, \fBHANDLE\fP fd)"
.br
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_copy2\fP (\fBMDB_env\fP *env, const char *path, unsigned int flags)"
.br
.RI "\fICopy an LMDB environment to the specified path, with options\&. \fP"
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_copy\fP (\fBMDB_env\fP *env, const char *path)"
.br
.RI "\fICopy an LMDB environment to the specified path\&. \fP"
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_set_flags\fP (\fBMDB_env\fP *env, unsigned int flag, int onoff)"
.br
.RI "\fISet environment flags\&. \fP"
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_get_flags\fP (\fBMDB_env\fP *env, unsigned int *arg)"
.br
.RI "\fIGet environment flags\&. \fP"
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_set_userctx\fP (\fBMDB_env\fP *env, void *ctx)"
.br
.RI "\fISet application information associated with the \fBMDB_env\fP\&. \fP"
.ti -1c
.RI "void *\fBESECT\fP \fBmdb_env_get_userctx\fP (\fBMDB_env\fP *env)"
.br
.RI "\fIGet the application information associated with the \fBMDB_env\fP\&. \fP"
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_set_assert\fP (\fBMDB_env\fP *env, \fBMDB_assert_func\fP *func)"
.br
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_get_path\fP (\fBMDB_env\fP *env, const char **arg)"
.br
.RI "\fIReturn the path that was used in \fBmdb_env_open()\fP\&. \fP"
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_get_fd\fP (\fBMDB_env\fP *env, \fBmdb_filehandle_t\fP *arg)"
.br
.RI "\fIReturn the filedescriptor for the given environment\&. \fP"
.ti -1c
.RI "static int \fBESECT\fP \fBmdb_stat0\fP (\fBMDB_env\fP *env, \fBMDB_db\fP *db, \fBMDB_stat\fP *arg)"
.br
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_stat\fP (\fBMDB_env\fP *env, \fBMDB_stat\fP *arg)"
.br
.RI "\fIReturn statistics about the LMDB environment\&. \fP"
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_info\fP (\fBMDB_env\fP *env, \fBMDB_envinfo\fP *arg)"
.br
.RI "\fIReturn information about the LMDB environment\&. \fP"
.ti -1c
.RI "int \fBmdb_dbi_open\fP (\fBMDB_txn\fP *txn, const char *name, unsigned int flags, \fBMDB_dbi\fP *dbi)"
.br
.RI "\fIOpen a database in the environment\&. \fP"
.ti -1c
.RI "int \fBESECT\fP \fBmdb_stat\fP (\fBMDB_txn\fP *txn, \fBMDB_dbi\fP dbi, \fBMDB_stat\fP *arg)"
.br
.RI "\fIRetrieve statistics for a database\&. \fP"
.ti -1c
.RI "void \fBmdb_dbi_close\fP (\fBMDB_env\fP *env, \fBMDB_dbi\fP dbi)"
.br
.RI "\fIClose a database handle\&. Normally unnecessary\&. Use with care: \fP"
.ti -1c
.RI "int \fBmdb_dbi_flags\fP (\fBMDB_txn\fP *txn, \fBMDB_dbi\fP dbi, unsigned int *flags)"
.br
.RI "\fIRetrieve the DB flags for a database handle\&. \fP"
.ti -1c
.RI "int \fBmdb_drop\fP (\fBMDB_txn\fP *txn, \fBMDB_dbi\fP dbi, int del)"
.br
.RI "\fIEmpty or delete+close a database\&. \fP"
.ti -1c
.RI "int \fBmdb_set_compare\fP (\fBMDB_txn\fP *txn, \fBMDB_dbi\fP dbi, \fBMDB_cmp_func\fP *cmp)"
.br
.RI "\fISet a custom key comparison function for a database\&. \fP"
.ti -1c
.RI "int \fBmdb_set_dupsort\fP (\fBMDB_txn\fP *txn, \fBMDB_dbi\fP dbi, \fBMDB_cmp_func\fP *cmp)"
.br
.RI "\fISet a custom data comparison function for a \fBMDB_DUPSORT\fP database\&. \fP"
.ti -1c
.RI "int \fBmdb_set_relfunc\fP (\fBMDB_txn\fP *txn, \fBMDB_dbi\fP dbi, \fBMDB_rel_func\fP *rel)"
.br
.RI "\fISet a relocation function for a \fBMDB_FIXEDMAP\fP database\&. \fP"
.ti -1c
.RI "int \fBmdb_set_relctx\fP (\fBMDB_txn\fP *txn, \fBMDB_dbi\fP dbi, void *ctx)"
.br
.RI "\fISet a context pointer for a \fBMDB_FIXEDMAP\fP database's relocation function\&. \fP"
.ti -1c
.RI "int \fBESECT\fP \fBmdb_env_get_maxkeysize\fP (\fBMDB_env\fP *env)"
.br
.RI "\fIGet the maximum size of keys and \fBMDB_DUPSORT\fP data we can write\&. \fP"
.ti -1c
.RI "int \fBESECT\fP \fBmdb_reader_list\fP (\fBMDB_env\fP *env, \fBMDB_msg_func\fP *func, void *ctx)"
.br
.RI "\fIDump the entries in the reader lock table\&. \fP"
.ti -1c
.RI "static int \fBESECT\fP \fBmdb_pid_insert\fP (MDB_PID_T *ids, MDB_PID_T pid)"
.br
.ti -1c
.RI "int \fBESECT\fP \fBmdb_reader_check\fP (\fBMDB_env\fP *env, int *dead)"
.br
.RI "\fICheck for stale entries in the reader lock table\&. \fP"
.in -1c
.SS "Variables"

.in +1c
.ti -1c
.RI "static char *const \fBmdb_errstr\fP []"
.br
.in -1c
.SH "Detailed Description"
.PP 
Lightning memory-mapped database library\&. 

A Btree-based database management library modeled loosely on the BerkeleyDB API, but much simplified\&. 
.SH "Macro Definition Documentation"
.PP 
.SS "#define ESECT   __attribute__ ((section('text_env')))"
Put infrequently used env functions in separate section 
.SS "#define mr_txnid   mru\&.mrx\&.mrb_txnid"
shorthand for mrb_txnid 
.SS "#define mm_psize   mm_dbs[\fBFREE_DBI\fP]\&.md_pad"
The size of pages used in this DB 
.SS "#define mm_flags   mm_dbs[\fBFREE_DBI\fP]\&.md_flags"
Any persistent environment flags\&. \fBEnvironment Flags\fP 
.SS "#define MDB_FATAL_ERROR   0x80000000U"
Failed to update the meta page\&. Probably an I/O error\&. 
.SS "#define MDB_ENV_ACTIVE   0x20000000U"
Some fields are initialized\&. 
.SS "#define MDB_ENV_TXKEY   0x10000000U"
me_txkey is set 
.SS "#define MDB_FSYNCONLY   0x08000000U"
fdatasync is unreliable 
.SS "#define me_rmutex   me_txns->mti_rmutex"
Shared reader lock 
.SS "#define me_wmutex   me_txns->mti_wmutex"
Shared writer lock 
.SS "#define DO_PWRITE(rc, fd, ptr, size, len, pos)"
\fBValue:\fP
.PP
.nf
do { \
    len = pwrite(fd, ptr, size, pos);   \
    if (len == -1 && ErrCode() == EINTR) continue; \
    rc = (len >= 0); break; } while(1)
.fi
.SH "Author"
.PP 
Generated automatically by Doxygen for LMDB from the source code\&.