usr/src/lib/libbc/libc/gen/common/mblib.c

   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 1990 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 /*
  30  * misc routines
  31  */
  32
  33 #include <stdio.h>
  34 #include <sys/types.h>
  35 #include "codeset.h"
  36 #include "mbextern.h"
  37 #include <dlfcn.h>
  38
  39 static void *handle = (void *)NULL;     /* initialize it with NULL */
  40
  41 /*
  42  * Close current library library
  43  */
  44 int
  45 _ml_close_library(void)
  46 {
  47         if (handle == (void *)NULL) {
  48                 _code_set_info.open_flag = NULL;
  49                 return (-1);
  50         }
  51
  52         dlclose(handle);
  53         _code_set_info.open_flag = NULL;
  54         handle = (void *)NULL;
  55         return (0);
  56 }
  57
  58 /*
  59  * Open the given library
  60  */
  61 void *
  62 _ml_open_library(void)
  63 {
  64         char buf[BUFSIZ];
  65
  66         if (handle != (void *)NULL) /* This library is already opened */
  67                 return (handle);
  68
  69         /*
  70          * Open the given library
  71          */
  72         strcpy(buf, LIBRARY_PATH);
  73         strcat(buf, _code_set_info.code_name);
  74         strcat(buf, ".so");
  75 #ifdef DEBUG
  76         printf ("ml_open_library: buf = '%s'\n", buf);
  77 #endif
  78         handle = dlopen(buf, 1);
  79         if (handle != (void *)NULL)
  80                 _code_set_info.open_flag = 1;
  81 #ifdef DEBUG
  82         else
  83                 printf ("_ml_open_library: dlopen failed\n");
  84 #endif
  85         return (handle);
  86 }