1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2000-2001 by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26 
  27 /*
  28  * Copyright (c) 2018, Joyent, Inc.
  29  */
  30 
  31 /*
  32  * syseventd client interfaces
  33  */
  34 
  35 #include <stdio.h>
  36 #include <sys/types.h>
  37 #include <stdarg.h>
  38 #include <stddef.h>
  39 #include <stdlib.h>
  40 #include <unistd.h>
  41 #include <door.h>
  42 #include <errno.h>
  43 #include <strings.h>
  44 #include <thread.h>
  45 #include <pthread.h>
  46 #include <synch.h>
  47 #include <syslog.h>
  48 #include <fcntl.h>
  49 #include <stropts.h>
  50 #include <locale.h>
  51 #include <libsysevent.h>
  52 #include <sys/stat.h>
  53 #include <sys/sysevent.h>
  54 
  55 #include "syseventd.h"
  56 #include "message.h"
  57 
  58 /*
  59  * sysevent_client.c - contains routines particular to syseventd client
  60  *                      management (addition and deletion).
  61  */
  62 
  63 /* Global client table and lock */
  64 struct sysevent_client *sysevent_client_tbl[MAX_SLM];
  65 mutex_t client_tbl_lock;
  66 
  67 /*
  68  * initialize_client_tbl - Initialize each client entry in the syseventd
  69  *                         client table.  Each entry in the client table
  70  *                         entry represents one shared-object (SLM) client.
  71  */
  72 void
  73 initialize_client_tbl()
  74 {
  75         struct sysevent_client  *scp;
  76         int                     i;
  77 
  78         for (i = 0; i < MAX_SLM; ++i) {
  79                 if ((scp = (struct sysevent_client *)malloc(
  80                         sizeof (struct sysevent_client))) == NULL)
  81                         goto init_error;
  82 
  83                 if (mutex_init(&scp->client_lock, USYNC_THREAD, NULL) != 0)
  84                         goto init_error;
  85 
  86                 scp->client_data = NULL;
  87                 scp->client_num = i;
  88                 scp->eventq = NULL;
  89 
  90                 /* Clear all flags when setting UNLOADED */
  91                 scp->client_flags = SE_CLIENT_UNLOADED;
  92 
  93                 sysevent_client_tbl[i] = scp;
  94         }
  95 
  96         return;
  97 
  98 init_error:
  99         syseventd_err_print(INIT_CLIENT_TBL_ERR);
 100         syseventd_exit(1);
 101 }
 102 
 103 /*
 104  * insert_client - called when a new SLM is loaded with syseventd.  The
 105  *                 client specific data is updated to reflect this addition
 106  */
 107 int
 108 insert_client(void *client_data, int client_type, int retry_limit)
 109 {
 110         int     i;
 111         struct sysevent_client  *scp;
 112 
 113         (void) mutex_lock(&client_tbl_lock);
 114         for (i = 0; i < MAX_SLM; ++i) {
 115                 scp = sysevent_client_tbl[i];
 116                 if (scp->client_data == NULL) {
 117                         (void) mutex_lock(&scp->client_lock);
 118                         scp->client_data = client_data;
 119                         scp->client_type = client_type;
 120                         scp->retry_limit = retry_limit;
 121                         scp->client_flags |= SE_CLIENT_LOADED;
 122                         (void) cond_init(&scp->client_cv, USYNC_THREAD,
 123                                 NULL);
 124                         (void) mutex_unlock(&scp->client_lock);
 125                         (void) mutex_unlock(&client_tbl_lock);
 126                         return (i);
 127                 }
 128         }
 129 
 130         (void) mutex_unlock(&client_tbl_lock);
 131         syseventd_print(1, "Unable to insert into syseventd client table\n");
 132         return (-1);
 133 }
 134 
 135 /*
 136  * delete_client - called to remove an SLM from the client table.  Client
 137  *                 removal may occur when syseventd terminates, receives
 138  *                 a SIGHUP or the client must be force unloaded due
 139  *                 it's unresponsive nature.
 140  */
 141 void
 142 delete_client(int id)
 143 {
 144         struct sysevent_client  *scp;
 145 
 146         scp = sysevent_client_tbl[id];
 147 
 148         free(scp->client_data);
 149         scp->client_data = NULL;
 150 
 151         /* Clear all flags when setting UNLOADED */
 152         scp->client_flags = SE_CLIENT_UNLOADED;
 153         (void) cond_destroy(&scp->client_cv);
 154         bzero(&scp->client_cv, sizeof (cond_t));
 155 }