1 /* $NetBSD: rww.c,v 1.4 2025/09/05 21:16:29 christos Exp $ */ 2 3 /* readw.c - deal with read waiters subsystem */ 4 /* $OpenLDAP$ */ 5 /* This work is part of OpenLDAP Software <http://www.openldap.org/>. 6 * 7 * Copyright 2001-2024 The OpenLDAP Foundation. 8 * Portions Copyright 2001-2003 Pierangelo Masarati. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted only as authorized by the OpenLDAP 13 * Public License. 14 * 15 * A copy of this license is available in file LICENSE in the 16 * top-level directory of the distribution or, alternatively, at 17 * <http://www.OpenLDAP.org/license.html>. 18 */ 19 /* ACKNOWLEDGEMENTS: 20 * This work was initially developed by Pierangelo Masarati for inclusion 21 * in OpenLDAP Software. 22 */ 23 24 #include <sys/cdefs.h> 25 __RCSID("$NetBSD: rww.c,v 1.4 2025/09/05 21:16:29 christos Exp $"); 26 27 #include "portable.h" 28 29 #include <stdio.h> 30 #include <ac/string.h> 31 32 #include "slap.h" 33 #include "lutil.h" 34 #include "back-monitor.h" 35 36 static int 37 monitor_subsys_rww_destroy( 38 BackendDB *be, 39 monitor_subsys_t *ms ); 40 41 static int 42 monitor_subsys_rww_update( 43 Operation *op, 44 SlapReply *rs, 45 Entry *e ); 46 47 enum { 48 MONITOR_RWW_READ = 0, 49 MONITOR_RWW_WRITE, 50 51 MONITOR_RWW_LAST 52 }; 53 54 static struct monitor_rww_t { 55 struct berval rdn; 56 struct berval nrdn; 57 } monitor_rww[] = { 58 { BER_BVC("cn=Read"), BER_BVNULL }, 59 { BER_BVC("cn=Write"), BER_BVNULL }, 60 { BER_BVNULL, BER_BVNULL } 61 }; 62 63 int 64 monitor_subsys_rww_init( 65 BackendDB *be, 66 monitor_subsys_t *ms ) 67 { 68 monitor_info_t *mi; 69 70 Entry *e_conn; 71 monitor_entry_t *mp; 72 int i; 73 74 assert( be != NULL ); 75 76 ms->mss_destroy = monitor_subsys_rww_destroy; 77 ms->mss_update = monitor_subsys_rww_update; 78 79 mi = ( monitor_info_t * )be->be_private; 80 81 if ( monitor_cache_get( mi, &ms->mss_ndn, &e_conn ) ) { 82 Debug( LDAP_DEBUG_ANY, 83 "monitor_subsys_rww_init: " 84 "unable to get entry \"%s\"\n", 85 ms->mss_ndn.bv_val ); 86 return( -1 ); 87 } 88 89 for ( i = 0; i < MONITOR_RWW_LAST; i++ ) { 90 struct berval nrdn, bv; 91 Entry *e; 92 93 e = monitor_entry_stub( &ms->mss_dn, &ms->mss_ndn, &monitor_rww[i].rdn, 94 mi->mi_oc_monitorCounterObject, NULL, NULL ); 95 if ( e == NULL ) { 96 Debug( LDAP_DEBUG_ANY, 97 "monitor_subsys_rww_init: " 98 "unable to create entry \"cn=Read,%s\"\n", 99 ms->mss_ndn.bv_val ); 100 return( -1 ); 101 } 102 103 /* steal normalized RDN */ 104 dnRdn( &e->e_nname, &nrdn ); 105 ber_dupbv( &monitor_rww[ i ].nrdn, &nrdn ); 106 107 BER_BVSTR( &bv, "0" ); 108 attr_merge_one( e, mi->mi_ad_monitorCounter, &bv, NULL ); 109 110 mp = monitor_entrypriv_create(); 111 if ( mp == NULL ) { 112 return -1; 113 } 114 e->e_private = ( void * )mp; 115 mp->mp_info = ms; 116 mp->mp_flags = ms->mss_flags \ 117 | MONITOR_F_SUB | MONITOR_F_PERSISTENT; 118 119 if ( monitor_cache_add( mi, e, e_conn ) ) { 120 Debug( LDAP_DEBUG_ANY, 121 "monitor_subsys_rww_init: " 122 "unable to add entry \"%s,%s\"\n", 123 monitor_rww[ i ].rdn.bv_val, 124 ms->mss_ndn.bv_val ); 125 return( -1 ); 126 } 127 } 128 129 monitor_cache_release( mi, e_conn ); 130 131 return( 0 ); 132 } 133 134 static int 135 monitor_subsys_rww_destroy( 136 BackendDB *be, 137 monitor_subsys_t *ms ) 138 { 139 int i; 140 141 for ( i = 0; i < MONITOR_RWW_LAST; i++ ) { 142 ber_memfree_x( monitor_rww[ i ].nrdn.bv_val, NULL ); 143 } 144 145 return 0; 146 } 147 148 static int 149 monitor_subsys_rww_update( 150 Operation *op, 151 SlapReply *rs, 152 Entry *e ) 153 { 154 monitor_info_t *mi = (monitor_info_t *)op->o_bd->be_private; 155 Connection *c; 156 ber_socket_t connindex; 157 long nconns, nwritewaiters, nreadwaiters; 158 159 int i; 160 struct berval nrdn; 161 162 Attribute *a; 163 char buf[LDAP_PVT_INTTYPE_CHARS(long)]; 164 long num = 0; 165 ber_len_t len; 166 167 assert( mi != NULL ); 168 assert( e != NULL ); 169 170 dnRdn( &e->e_nname, &nrdn ); 171 172 for ( i = 0; !BER_BVISNULL( &monitor_rww[ i ].nrdn ); i++ ) { 173 if ( dn_match( &nrdn, &monitor_rww[ i ].nrdn ) ) { 174 break; 175 } 176 } 177 178 if ( i == MONITOR_RWW_LAST ) { 179 return SLAP_CB_CONTINUE; 180 } 181 182 nconns = nwritewaiters = nreadwaiters = 0; 183 for ( c = connection_first( &connindex ); 184 c != NULL; 185 c = connection_next( c, &connindex ), nconns++ ) 186 { 187 if ( c->c_writewaiter ) { 188 nwritewaiters++; 189 } 190 191 /* FIXME: ?!? */ 192 if ( c->c_currentber != NULL ) { 193 nreadwaiters++; 194 } 195 } 196 connection_done(c); 197 198 switch ( i ) { 199 case MONITOR_RWW_READ: 200 num = nreadwaiters; 201 break; 202 203 case MONITOR_RWW_WRITE: 204 num = nwritewaiters; 205 break; 206 207 default: 208 assert( 0 ); 209 } 210 211 snprintf( buf, sizeof( buf ), "%ld", num ); 212 213 a = attr_find( e->e_attrs, mi->mi_ad_monitorCounter ); 214 assert( a != NULL ); 215 len = strlen( buf ); 216 if ( len > a->a_vals[ 0 ].bv_len ) { 217 a->a_vals[ 0 ].bv_val = ber_memrealloc( a->a_vals[ 0 ].bv_val, len + 1 ); 218 if ( BER_BVISNULL( &a->a_vals[ 0 ] ) ) { 219 BER_BVZERO( &a->a_vals[ 0 ] ); 220 return SLAP_CB_CONTINUE; 221 } 222 } 223 AC_MEMCPY( a->a_vals[ 0 ].bv_val, buf, len + 1 ); 224 a->a_vals[ 0 ].bv_len = len; 225 226 /* FIXME: touch modifyTimestamp? */ 227 228 return SLAP_CB_CONTINUE; 229 } 230 231
Indexes created Sun Oct 18 00:25:03 UTC 2026