17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 53f95ae75Ssm26363 * Common Development and Distribution License (the "License"). 63f95ae75Ssm26363 * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 217c478bd9Sstevel@tonic-gate /* 223f95ae75Ssm26363 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 237c478bd9Sstevel@tonic-gate * Use is subject to license terms. 247c478bd9Sstevel@tonic-gate */ 257c478bd9Sstevel@tonic-gate 267c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 277c478bd9Sstevel@tonic-gate 287c478bd9Sstevel@tonic-gate #include <unistd.h> 297c478bd9Sstevel@tonic-gate #include <syslog.h> 307c478bd9Sstevel@tonic-gate #include <sys/mman.h> 317c478bd9Sstevel@tonic-gate #include <thread.h> 327c478bd9Sstevel@tonic-gate #include <synch.h> 33*4a190493Ssdussud #include <strings.h> 347c478bd9Sstevel@tonic-gate #include <ndbm.h> 357c478bd9Sstevel@tonic-gate #include "../ypsym.h" 367c478bd9Sstevel@tonic-gate #include "../ypdefs.h" 37*4a190493Ssdussud #include "shim.h" 387c478bd9Sstevel@tonic-gate 397c478bd9Sstevel@tonic-gate /* 407c478bd9Sstevel@tonic-gate * These routines provide mutual exclusion between ypserv and ypxfr. 417c478bd9Sstevel@tonic-gate * Mutual exclusion is needed so that ypxfr doesn't try to rename 427c478bd9Sstevel@tonic-gate * dbm files while ypserv is trying to open them. After ypserv has 437c478bd9Sstevel@tonic-gate * opened a dbm file, it is safe to rename it because ypserv still 447c478bd9Sstevel@tonic-gate * has access to the file through its file descriptor. 457c478bd9Sstevel@tonic-gate */ 467c478bd9Sstevel@tonic-gate 477c478bd9Sstevel@tonic-gate #define LOCKFILE "/var/run/yp_maplock" 487c478bd9Sstevel@tonic-gate struct lockarray { 497c478bd9Sstevel@tonic-gate mutex_t locknode[MAXHASH]; 507c478bd9Sstevel@tonic-gate }; 517c478bd9Sstevel@tonic-gate typedef struct lockarray lockarray; 527c478bd9Sstevel@tonic-gate 537c478bd9Sstevel@tonic-gate /* 547c478bd9Sstevel@tonic-gate * Cross-process robust mutex locks. 557c478bd9Sstevel@tonic-gate * Provide synchronization between YP processes 567c478bd9Sstevel@tonic-gate * by implementing an exclusive locking mechanism 577c478bd9Sstevel@tonic-gate * via a memory-mapped file. 587c478bd9Sstevel@tonic-gate */ 597c478bd9Sstevel@tonic-gate static struct lockarray *shmlockarray; 607c478bd9Sstevel@tonic-gate static int lockfile; 617c478bd9Sstevel@tonic-gate 62*4a190493Ssdussud /* 63*4a190493Ssdussud * Hash functions, used for by the locking mechanism. 64*4a190493Ssdussud * 65*4a190493Ssdussud * - hash() is the front-end function that gets called. 66*4a190493Ssdussud * - get_map_id() returns a unique int value per map. 67*4a190493Ssdussud * It is used in N2L mode only. 68*4a190493Ssdussud * It is called by hash() in N2L mode. 69*4a190493Ssdussud */ 70*4a190493Ssdussud int 71*4a190493Ssdussud get_map_id(char *map_name, int index) 72*4a190493Ssdussud { 73*4a190493Ssdussud map_id_elt_t *cur_elt; 74*4a190493Ssdussud /* 75*4a190493Ssdussud * Local references to hash table for map lists 76*4a190493Ssdussud * and to max number of maps 77*4a190493Ssdussud */ 78*4a190493Ssdussud map_id_elt_t **map_list_p; 79*4a190493Ssdussud int max_map; 80*4a190493Ssdussud 81*4a190493Ssdussud /* initializes map_list_p & max_map */ 82*4a190493Ssdussud get_list_max(&map_list_p, &max_map); 83*4a190493Ssdussud 84*4a190493Ssdussud cur_elt = map_list_p[index]; 85*4a190493Ssdussud while (cur_elt != NULL) { 86*4a190493Ssdussud if (strcmp(map_name, cur_elt->map_name) == 0) { 87*4a190493Ssdussud /* found */ 88*4a190493Ssdussud return (cur_elt->map_id); 89*4a190493Ssdussud } 90*4a190493Ssdussud cur_elt = cur_elt->next; 91*4a190493Ssdussud } 92*4a190493Ssdussud syslog(LOG_WARNING, "get_map_id: no hash id found for %s" 93*4a190493Ssdussud ", giving max_map value (%d)", 94*4a190493Ssdussud map_name, max_map); 95*4a190493Ssdussud /* 96*4a190493Ssdussud * max_map does not match any map id, hence 97*4a190493Ssdussud * will not trigger any lock collision 98*4a190493Ssdussud * with existing maps. 99*4a190493Ssdussud * Needed for yp regular locking mechanism. 100*4a190493Ssdussud */ 101*4a190493Ssdussud return (max_map); 102*4a190493Ssdussud } 103*4a190493Ssdussud 1047c478bd9Sstevel@tonic-gate int 1057c478bd9Sstevel@tonic-gate hash(char *s) 1067c478bd9Sstevel@tonic-gate { 1073f95ae75Ssm26363 unsigned int n = 0; 1087c478bd9Sstevel@tonic-gate int i; 109*4a190493Ssdussud char *map_name = s; 1107c478bd9Sstevel@tonic-gate 1117c478bd9Sstevel@tonic-gate for (i = 1; *s; i += 10, s++) { 1127c478bd9Sstevel@tonic-gate n += i * (*s); 1137c478bd9Sstevel@tonic-gate } 1147c478bd9Sstevel@tonic-gate n %= MAXHASH; 115*4a190493Ssdussud 116*4a190493Ssdussud if (yptol_mode & yptol_newlock) { 117*4a190493Ssdussud return (get_map_id(map_name, n)); 118*4a190493Ssdussud } else { 1197c478bd9Sstevel@tonic-gate return (n); 1207c478bd9Sstevel@tonic-gate } 121*4a190493Ssdussud } 1227c478bd9Sstevel@tonic-gate 1237c478bd9Sstevel@tonic-gate bool 1247c478bd9Sstevel@tonic-gate init_locks_mem() 1257c478bd9Sstevel@tonic-gate { 1267c478bd9Sstevel@tonic-gate int iiter, rc; 1277c478bd9Sstevel@tonic-gate int ebusy_cnt = 0; 1287c478bd9Sstevel@tonic-gate 1297c478bd9Sstevel@tonic-gate /* 1307c478bd9Sstevel@tonic-gate * Initialize cross-process locks in memory-mapped file. 1317c478bd9Sstevel@tonic-gate */ 1327c478bd9Sstevel@tonic-gate for (iiter = 0; iiter < MAXHASH; iiter++) { 1337c478bd9Sstevel@tonic-gate if (rc = mutex_init(&(shmlockarray->locknode[iiter]), 1347c478bd9Sstevel@tonic-gate USYNC_PROCESS_ROBUST, 0)) { 1357c478bd9Sstevel@tonic-gate if (rc == EBUSY) { 1367c478bd9Sstevel@tonic-gate ebusy_cnt++; 1377c478bd9Sstevel@tonic-gate } else { 1387c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 1397c478bd9Sstevel@tonic-gate "init_locks_mem():mutex_init():error=%d", 1407c478bd9Sstevel@tonic-gate rc); 1417c478bd9Sstevel@tonic-gate return (FALSE); 1427c478bd9Sstevel@tonic-gate } 1437c478bd9Sstevel@tonic-gate } 1447c478bd9Sstevel@tonic-gate } 1457c478bd9Sstevel@tonic-gate 1467c478bd9Sstevel@tonic-gate /* 1477c478bd9Sstevel@tonic-gate * EBUSY for all locks OK, it means another process 1487c478bd9Sstevel@tonic-gate * has already initialized locks. 1497c478bd9Sstevel@tonic-gate */ 1507c478bd9Sstevel@tonic-gate if ((ebusy_cnt > 0) && (ebusy_cnt != MAXHASH)) { 1517c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 1527c478bd9Sstevel@tonic-gate "%s inconsistent. Remove and restart NIS (YP).", LOCKFILE); 1537c478bd9Sstevel@tonic-gate return (FALSE); 1547c478bd9Sstevel@tonic-gate } 1557c478bd9Sstevel@tonic-gate return (TRUE); 1567c478bd9Sstevel@tonic-gate } 1577c478bd9Sstevel@tonic-gate 1587c478bd9Sstevel@tonic-gate bool 1597c478bd9Sstevel@tonic-gate init_lock_map() 1607c478bd9Sstevel@tonic-gate { 1617c478bd9Sstevel@tonic-gate char buff[ sizeof (lockarray) ]; 1627c478bd9Sstevel@tonic-gate int write_cnt, lf_size; 1637c478bd9Sstevel@tonic-gate struct stat fdata; 1647c478bd9Sstevel@tonic-gate 1657c478bd9Sstevel@tonic-gate /* 1667c478bd9Sstevel@tonic-gate * Locking file initialization algorithm, with recovery mechanism. 1677c478bd9Sstevel@tonic-gate * This mechanism has been devised to ensure proper creation 1687c478bd9Sstevel@tonic-gate * of a memory-mapped lock file containing mutexes for robust, 1697c478bd9Sstevel@tonic-gate * inter-process communication. 1707c478bd9Sstevel@tonic-gate * File name is /var/run/yp_maplock (LOCKFILE). It might or might 1717c478bd9Sstevel@tonic-gate * not exist. 1727c478bd9Sstevel@tonic-gate * 1737c478bd9Sstevel@tonic-gate * Algorithm: 1747c478bd9Sstevel@tonic-gate * Try to open the file. If file doesn't exist, or size is too small, 1757c478bd9Sstevel@tonic-gate * create/rewrite the file, m-map it into memory and initialize the 1767c478bd9Sstevel@tonic-gate * mutexes in it. 1777c478bd9Sstevel@tonic-gate * If file exists and size is at least large enough, assume it's a 1787c478bd9Sstevel@tonic-gate * good file, and m-map the lock structure directly to it. 1797c478bd9Sstevel@tonic-gate * 1807c478bd9Sstevel@tonic-gate * Recovery from inconsistent state is easy - simply delete the file 1817c478bd9Sstevel@tonic-gate * and restart NIS (YP). 1827c478bd9Sstevel@tonic-gate */ 1837c478bd9Sstevel@tonic-gate 1847c478bd9Sstevel@tonic-gate lockfile = open(LOCKFILE, O_RDWR|O_CREAT, 0600); 1857c478bd9Sstevel@tonic-gate if (lockfile != -1) { 1867c478bd9Sstevel@tonic-gate if (lockf(lockfile, F_LOCK, 0) == 0) { 1877c478bd9Sstevel@tonic-gate if (fstat(lockfile, &fdata) == 0) { 1887c478bd9Sstevel@tonic-gate lf_size = fdata.st_size; 1897c478bd9Sstevel@tonic-gate if (lf_size < sizeof (lockarray)) { 1907c478bd9Sstevel@tonic-gate bzero(buff, sizeof (buff)); 1917c478bd9Sstevel@tonic-gate if ((write_cnt = write(lockfile, buff, 1927c478bd9Sstevel@tonic-gate sizeof (buff)) != sizeof (buff))) { 1937c478bd9Sstevel@tonic-gate if (write_cnt < 0) { 1947c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 1957c478bd9Sstevel@tonic-gate "write(%s) => errno=%d", 1967c478bd9Sstevel@tonic-gate LOCKFILE, errno); 1977c478bd9Sstevel@tonic-gate } else { 1987c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 1997c478bd9Sstevel@tonic-gate "write(%s) => %d!=%d: wrong number of bytes written.", 2007c478bd9Sstevel@tonic-gate LOCKFILE, 2017c478bd9Sstevel@tonic-gate write_cnt, 2027c478bd9Sstevel@tonic-gate sizeof (buff)); 2037c478bd9Sstevel@tonic-gate } 2047c478bd9Sstevel@tonic-gate lockf(lockfile, F_ULOCK, 0); 2057c478bd9Sstevel@tonic-gate close(lockfile); 2067c478bd9Sstevel@tonic-gate return (FALSE); 2077c478bd9Sstevel@tonic-gate } 2087c478bd9Sstevel@tonic-gate } 2097c478bd9Sstevel@tonic-gate } else { 2107c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 2117c478bd9Sstevel@tonic-gate "fstat(%s) => errno=%d", LOCKFILE, errno); 2127c478bd9Sstevel@tonic-gate lockf(lockfile, F_ULOCK, 0); 2137c478bd9Sstevel@tonic-gate close(lockfile); 2147c478bd9Sstevel@tonic-gate return (FALSE); 2157c478bd9Sstevel@tonic-gate } 2167c478bd9Sstevel@tonic-gate } else { 2177c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 2187c478bd9Sstevel@tonic-gate "lockf(%s,F_LOCK) => errno=%d", LOCKFILE, errno); 2197c478bd9Sstevel@tonic-gate close(lockfile); 2207c478bd9Sstevel@tonic-gate return (FALSE); 2217c478bd9Sstevel@tonic-gate } 2227c478bd9Sstevel@tonic-gate } else { 2237c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 2247c478bd9Sstevel@tonic-gate "open(%s) => errno=%d", LOCKFILE, errno); 2257c478bd9Sstevel@tonic-gate return (FALSE); 2267c478bd9Sstevel@tonic-gate } 2277c478bd9Sstevel@tonic-gate 2287c478bd9Sstevel@tonic-gate /* 2297c478bd9Sstevel@tonic-gate * File exists with correct size, is open, and we're holding 2307c478bd9Sstevel@tonic-gate * the file lock. 2317c478bd9Sstevel@tonic-gate */ 2327c478bd9Sstevel@tonic-gate shmlockarray = (lockarray *)mmap((caddr_t)0, sizeof (lockarray), 2337c478bd9Sstevel@tonic-gate PROT_READ | PROT_WRITE, MAP_SHARED, lockfile, 0); 2347c478bd9Sstevel@tonic-gate if (shmlockarray == MAP_FAILED) { 2357c478bd9Sstevel@tonic-gate syslog(LOG_ERR, "mmap(%s) => errno=%d", LOCKFILE, errno); 2367c478bd9Sstevel@tonic-gate lockf(lockfile, F_ULOCK, 0); 2377c478bd9Sstevel@tonic-gate close(lockfile); 2387c478bd9Sstevel@tonic-gate return (FALSE); 2397c478bd9Sstevel@tonic-gate } 2407c478bd9Sstevel@tonic-gate 2417c478bd9Sstevel@tonic-gate /* 2427c478bd9Sstevel@tonic-gate * If we wrote zeroes to the file, we also need to initialize 2437c478bd9Sstevel@tonic-gate * the mutex locks. 2447c478bd9Sstevel@tonic-gate */ 2457c478bd9Sstevel@tonic-gate if (lf_size < sizeof (lockarray)) { 2467c478bd9Sstevel@tonic-gate if (init_locks_mem() == FALSE) { 2477c478bd9Sstevel@tonic-gate lockf(lockfile, F_ULOCK, 0); 2487c478bd9Sstevel@tonic-gate close(lockfile); 2497c478bd9Sstevel@tonic-gate if (remove(LOCKFILE) != 0) { 2507c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 2517c478bd9Sstevel@tonic-gate "remove(%s) => errno=%d: Please delete file.", 2527c478bd9Sstevel@tonic-gate LOCKFILE, errno); 2537c478bd9Sstevel@tonic-gate } 2547c478bd9Sstevel@tonic-gate return (FALSE); 2557c478bd9Sstevel@tonic-gate } 2567c478bd9Sstevel@tonic-gate } 2577c478bd9Sstevel@tonic-gate 2587c478bd9Sstevel@tonic-gate if (lockf(lockfile, F_ULOCK, 0) != 0) { 2597c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 2607c478bd9Sstevel@tonic-gate "lockf(%s,F_ULOCK) => errno=%d", 2617c478bd9Sstevel@tonic-gate LOCKFILE, errno); 2627c478bd9Sstevel@tonic-gate close(lockfile); 2637c478bd9Sstevel@tonic-gate return (FALSE); 2647c478bd9Sstevel@tonic-gate } 2657c478bd9Sstevel@tonic-gate 2667c478bd9Sstevel@tonic-gate if (close(lockfile) == 0) { 2677c478bd9Sstevel@tonic-gate return (TRUE); 2687c478bd9Sstevel@tonic-gate } else { 2697c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 2707c478bd9Sstevel@tonic-gate "close(%s) => errno=%d", LOCKFILE, errno); 2717c478bd9Sstevel@tonic-gate return (FALSE); 2727c478bd9Sstevel@tonic-gate } 2737c478bd9Sstevel@tonic-gate } 2747c478bd9Sstevel@tonic-gate 2757c478bd9Sstevel@tonic-gate /* 2767c478bd9Sstevel@tonic-gate * FUNCTION : lock_map() 2777c478bd9Sstevel@tonic-gate * 2787c478bd9Sstevel@tonic-gate * DESCRIPTION: Front end to the lock routine taking map name as argument. 2797c478bd9Sstevel@tonic-gate * 2807c478bd9Sstevel@tonic-gate * GIVEN : Map name. 2817c478bd9Sstevel@tonic-gate * 2827c478bd9Sstevel@tonic-gate * RETURNS : Same as lock_core 2837c478bd9Sstevel@tonic-gate */ 2847c478bd9Sstevel@tonic-gate int 2857c478bd9Sstevel@tonic-gate lock_map(char *mapname) 2867c478bd9Sstevel@tonic-gate { 2877c478bd9Sstevel@tonic-gate int hashval; 2887c478bd9Sstevel@tonic-gate 2897c478bd9Sstevel@tonic-gate hashval = hash(mapname); 2907c478bd9Sstevel@tonic-gate 2917c478bd9Sstevel@tonic-gate return (lock_core(hashval)); 2927c478bd9Sstevel@tonic-gate } 2937c478bd9Sstevel@tonic-gate 2947c478bd9Sstevel@tonic-gate /* 2957c478bd9Sstevel@tonic-gate * FUNCTION : lock_core() 2967c478bd9Sstevel@tonic-gate * 2977c478bd9Sstevel@tonic-gate * DESCRIPTION: The core map locking function 2987c478bd9Sstevel@tonic-gate * 2997c478bd9Sstevel@tonic-gate * GIVEN : Map hash value 3007c478bd9Sstevel@tonic-gate * 3017c478bd9Sstevel@tonic-gate * RETURNS : 0 = Failure 3027c478bd9Sstevel@tonic-gate * 1 = Success 3037c478bd9Sstevel@tonic-gate */ 3047c478bd9Sstevel@tonic-gate int 3057c478bd9Sstevel@tonic-gate lock_core(int hashval) 3067c478bd9Sstevel@tonic-gate { 3077c478bd9Sstevel@tonic-gate int rc; 3087c478bd9Sstevel@tonic-gate 3097c478bd9Sstevel@tonic-gate /* 3107c478bd9Sstevel@tonic-gate * Robust, cross-process lock implementation 3117c478bd9Sstevel@tonic-gate */ 3127c478bd9Sstevel@tonic-gate rc = mutex_lock(&(shmlockarray->locknode[hashval])); 3137c478bd9Sstevel@tonic-gate while (rc != 0) { 3147c478bd9Sstevel@tonic-gate switch (rc) { 3157c478bd9Sstevel@tonic-gate case EOWNERDEAD: 3167c478bd9Sstevel@tonic-gate /* 3177c478bd9Sstevel@tonic-gate * Previows lock owner died, resetting lock 3187c478bd9Sstevel@tonic-gate * to recover from error. 3197c478bd9Sstevel@tonic-gate */ 3207c478bd9Sstevel@tonic-gate rc = mutex_init(&(shmlockarray->locknode[hashval]), 3217c478bd9Sstevel@tonic-gate USYNC_PROCESS_ROBUST, 0); 3227c478bd9Sstevel@tonic-gate if (rc != 0) { 3237c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 3247c478bd9Sstevel@tonic-gate "mutex_init(): error=%d", rc); 3257c478bd9Sstevel@tonic-gate return (0); 3267c478bd9Sstevel@tonic-gate } 3277c478bd9Sstevel@tonic-gate rc = mutex_unlock(&(shmlockarray->locknode[hashval])); 3287c478bd9Sstevel@tonic-gate if (rc != 0) { 3297c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 3307c478bd9Sstevel@tonic-gate "mutex_unlock(): error=%d", rc); 3317c478bd9Sstevel@tonic-gate return (0); 3327c478bd9Sstevel@tonic-gate } 3337c478bd9Sstevel@tonic-gate break; 3347c478bd9Sstevel@tonic-gate default: 3357c478bd9Sstevel@tonic-gate /* 3367c478bd9Sstevel@tonic-gate * Unrecoverable problem - nothing to do 3377c478bd9Sstevel@tonic-gate * but exit YP and delete lock file. 3387c478bd9Sstevel@tonic-gate */ 3397c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 3407c478bd9Sstevel@tonic-gate "mutex_lock(): error=%d", rc); 3417c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 3427c478bd9Sstevel@tonic-gate "Please restart NIS (ypstop/ypstart)."); 3437c478bd9Sstevel@tonic-gate if (remove(LOCKFILE) != 0) { 3447c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 3457c478bd9Sstevel@tonic-gate "remove(%s) => errno=%d: Please delete file.", 3467c478bd9Sstevel@tonic-gate LOCKFILE, errno); 3477c478bd9Sstevel@tonic-gate } 3487c478bd9Sstevel@tonic-gate return (0); 3497c478bd9Sstevel@tonic-gate } 3507c478bd9Sstevel@tonic-gate rc = mutex_lock(&(shmlockarray->locknode[hashval])); 3517c478bd9Sstevel@tonic-gate } 3527c478bd9Sstevel@tonic-gate 3537c478bd9Sstevel@tonic-gate /* Success */ 3547c478bd9Sstevel@tonic-gate return (1); 3557c478bd9Sstevel@tonic-gate } 3567c478bd9Sstevel@tonic-gate 3577c478bd9Sstevel@tonic-gate 3587c478bd9Sstevel@tonic-gate /* 3597c478bd9Sstevel@tonic-gate * FUNCTION : unlock_map() 3607c478bd9Sstevel@tonic-gate * 3617c478bd9Sstevel@tonic-gate * DESCRIPTION: Front end to the unlock routine taking map name as argument. 3627c478bd9Sstevel@tonic-gate * 3637c478bd9Sstevel@tonic-gate * GIVEN : Map name. 3647c478bd9Sstevel@tonic-gate * 3657c478bd9Sstevel@tonic-gate * RETURNS : Same as unlock_core 3667c478bd9Sstevel@tonic-gate */ 3677c478bd9Sstevel@tonic-gate int 3687c478bd9Sstevel@tonic-gate unlock_map(char *mapname) 3697c478bd9Sstevel@tonic-gate { 3707c478bd9Sstevel@tonic-gate int hashval; 3717c478bd9Sstevel@tonic-gate 3727c478bd9Sstevel@tonic-gate hashval = hash(mapname); 3737c478bd9Sstevel@tonic-gate 3747c478bd9Sstevel@tonic-gate return (unlock_core(hashval)); 3757c478bd9Sstevel@tonic-gate } 3767c478bd9Sstevel@tonic-gate 3777c478bd9Sstevel@tonic-gate /* 3787c478bd9Sstevel@tonic-gate * FUNCTION : unlock_core() 3797c478bd9Sstevel@tonic-gate * 3807c478bd9Sstevel@tonic-gate * DESCRIPTION: The core map locking function 3817c478bd9Sstevel@tonic-gate * 3827c478bd9Sstevel@tonic-gate * GIVEN : Map hash value 3837c478bd9Sstevel@tonic-gate * 3847c478bd9Sstevel@tonic-gate * RETURNS : 0 = Failure 3857c478bd9Sstevel@tonic-gate * 1 = Success 3867c478bd9Sstevel@tonic-gate */ 3877c478bd9Sstevel@tonic-gate int 3887c478bd9Sstevel@tonic-gate unlock_core(int hashval) 3897c478bd9Sstevel@tonic-gate { 3907c478bd9Sstevel@tonic-gate int rc; 3917c478bd9Sstevel@tonic-gate 3927c478bd9Sstevel@tonic-gate rc = mutex_unlock(&(shmlockarray->locknode[hashval])); 3937c478bd9Sstevel@tonic-gate if (rc != 0) { 3947c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 3957c478bd9Sstevel@tonic-gate "mutex_unlock(): error=%d", rc); 3967c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 3977c478bd9Sstevel@tonic-gate "Please restart NIS (ypstop/ypstart)."); 3987c478bd9Sstevel@tonic-gate if (remove(LOCKFILE) != 0) { 3997c478bd9Sstevel@tonic-gate syslog(LOG_ERR, 4007c478bd9Sstevel@tonic-gate "remove(%s) => errno=%d: Please delete file.", 4017c478bd9Sstevel@tonic-gate LOCKFILE, errno); 4027c478bd9Sstevel@tonic-gate } 4037c478bd9Sstevel@tonic-gate return (0); 4047c478bd9Sstevel@tonic-gate } 4057c478bd9Sstevel@tonic-gate 4067c478bd9Sstevel@tonic-gate /* Success */ 4077c478bd9Sstevel@tonic-gate return (1); 4087c478bd9Sstevel@tonic-gate } 409