cups/globals.c

   1 /*
   2  * "$Id: globals.c 4922 2006-01-12 22:05:06Z mike $"
   3  *
   4  *   Global variable access routines for the Common UNIX Printing System (CUPS).
   5  *
   6  *   Copyright 1997-2006 by Easy Software Products, all rights reserved.
   7  *
   8  *   These coded instructions, statements, and computer programs are the
   9  *   property of Easy Software Products and are protected by Federal
  10  *   copyright law.  Distribution and use rights are outlined in the file
  11  *   "LICENSE.txt" which should have been included with this file.  If this
  12  *   file is missing or damaged please contact Easy Software Products
  13  *   at:
  14  *
  15  *       Attn: CUPS Licensing Information
  16  *       Easy Software Products
  17  *       44141 Airport View Drive, Suite 204
  18  *       Hollywood, Maryland 20636 USA
  19  *
  20  *       Voice: (301) 373-9600
  21  *       EMail: cups-info@cups.org
  22  *         WWW: http://www.cups.org
  23  *
  24  *   This file is subject to the Apple OS-Developed Software exception.
  25  *
  26  * Contents:
  27  *
  28  *   _cupsGlobals()       - Return a pointer to thread local storage.
  29  *   cups_env_init()      - Initialize environment variables.
  30  *   globals_init()       - Initialize globals once.
  31  *   globals_destructor() - Free memory allocated by _cupsGlobals().
  32  */
  33
  34 /*
  35  * Include necessary headers...
  36  */
  37
  38 #include "http-private.h"
  39 #include "globals.h"
  40 #include <stdlib.h>
  41
  42
  43 /*
  44  * 'cups_env_init()' - Initialize environment variables.
  45  */
  46
  47 static void
  48 cups_env_init(_cups_globals_t *g)       /* I - Global data */
  49 {
  50   if ((g->cups_datadir = getenv("CUPS_DATADIR")) == NULL)
  51     g->cups_datadir = CUPS_DATADIR;
  52
  53   if ((g->cups_serverbin = getenv("CUPS_SERVERBIN")) == NULL)
  54     g->cups_serverbin = CUPS_SERVERBIN;
  55
  56   if ((g->cups_serverroot = getenv("CUPS_SERVERROOT")) == NULL)
  57     g->cups_serverroot = CUPS_SERVERROOT;
  58
  59   if ((g->cups_statedir = getenv("CUPS_STATEDIR")) == NULL)
  60     g->cups_statedir = CUPS_STATEDIR;
  61
  62   if ((g->localedir = getenv("LOCALEDIR")) == NULL)
  63     g->localedir = CUPS_LOCALEDIR;
  64 }
  65
  66
  67 #ifdef HAVE_PTHREAD_H
  68 /*
  69  * Implement per-thread globals...
  70  */
  71
  72 /*
  73  * Local globals...
  74  */
  75
  76 static pthread_key_t    globals_key = -1;
  77                                         /* Thread local storage key */
  78 static pthread_once_t   globals_key_once = PTHREAD_ONCE_INIT;
  79                                         /* One-time initialization object */
  80
  81
  82 /*
  83  * Local functions...
  84  */
  85
  86 static void     globals_init();
  87 static void     globals_destructor(void *value);
  88
  89
  90 /*
  91  * '_cupsGlobals()' - Return a pointer to thread local storage
  92  */
  93
  94 _cups_globals_t *                       /* O - Pointer to global data */
  95 _cupsGlobals(void)
  96 {
  97   _cups_globals_t *globals;             /* Pointer to global data */
  98
  99
 100  /*
 101   * Initialize the global data exactly once...
 102   */
 103
 104   pthread_once(&globals_key_once, globals_init);
 105
 106  /*
 107   * See if we have allocated the data yet...
 108   */
 109
 110   if ((globals = (_cups_globals_t *)pthread_getspecific(globals_key)) == NULL)
 111   {
 112    /*
 113     * No, allocate memory as set the pointer for the key...
 114     */
 115
 116     globals = calloc(1, sizeof(_cups_globals_t));
 117     pthread_setspecific(globals_key, globals);
 118
 119    /*
 120     * Initialize variables that have non-zero values
 121     */
 122
 123     globals->encryption  = (http_encryption_t)-1;
 124     globals->password_cb = _cupsGetPassword;
 125
 126     cups_env_init(globals);
 127   }
 128
 129  /*
 130   * Return the pointer to the data...
 131   */
 132
 133   return (globals);
 134 }
 135
 136
 137 /*
 138  * 'globals_init()' - Initialize globals once.
 139  */
 140
 141 static void
 142 globals_init()
 143 {
 144   pthread_key_create(&globals_key, globals_destructor);
 145 }
 146
 147
 148 /*
 149  * 'globals_destructor()' - Free memory allocated by _cupsGlobals().
 150  */
 151
 152 static void
 153 globals_destructor(void *value)         /* I - Data to free */
 154 {
 155   free(value);
 156 }
 157
 158
 159 #else
 160 /*
 161  * Implement static globals...
 162  */
 163
 164 /*
 165  * '_cupsGlobals()' - Return a pointer to thread local storage.
 166  */
 167
 168 _cups_globals_t *                       /* O - Pointer to global data */
 169 _cupsGlobals(void)
 170 {
 171   static _cups_globals_t globals;       /* Global data */
 172   static int            initialized = 0;/* Global data initialized? */
 173
 174
 175  /*
 176   * Initialize global data as needed...
 177   */
 178
 179   if (!initialized)
 180   {
 181     initialized = 1;
 182
 183    /*
 184     * Initialize global variables...
 185     */
 186
 187     memset(&globals, 0, sizeof(globals));
 188
 189     globals.encryption  = (http_encryption_t)-1;
 190     globals.password_cb = _cupsGetPassword;
 191
 192     cups_env_init(&globals);
 193   }
 194
 195   return (&globals);
 196 }
 197 #endif /* HAVE_PTHREAD_H */
 198
 199
 200 /*
 201  * End of "$Id: globals.c 4922 2006-01-12 22:05:06Z mike $".
 202  */