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/* Copyright 1998 by the Massachusetts Institute of Technology.
* Copyright (C) 2004-2009 by Daniel Stenberg
*
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting
* documentation, and that the name of M.I.T. not be used in
* advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is"
* without express or implied warranty.
*/
#include "ares_setup.h"
#include "ares.h"
#include "ares_private.h"
#include "atomic.h"
/* library-private global and unique instance vars */
#if defined(ANDROID) || defined(__ANDROID__)
#include "ares_android.h"
#endif
/* library-private global vars with source visibility restricted to this file */
static atomic_t ares_init_lock;
static unsigned int ares_initialized;
static int ares_init_flags;
/* library-private global vars with visibility across the whole library */
/* Some systems may return either NULL or a valid pointer on malloc(0). c-ares should
* never call malloc(0) so lets return NULL so we're more likely to find an issue if it
* were to occur. */
static void *default_malloc(size_t size) { if (size == 0) { return NULL; } return malloc(size); }
#if defined(WIN32)
/* We need indirections to handle Windows DLL rules. */
static void *default_realloc(void *p, size_t size) { return realloc(p, size); }
static void default_free(void *p) { free(p); }
#else
# define default_realloc realloc
# define default_free free
#endif
void *(*ares_malloc)(size_t size) = default_malloc;
void *(*ares_realloc)(void *ptr, size_t size) = default_realloc;
void (*ares_free)(void *ptr) = default_free;
int ares_library_init_unsafe(int flags)
{
if (ares_initialized)
{
ares_initialized++;
return ARES_SUCCESS;
}
ares_initialized++;
/* NOTE: ARES_LIB_INIT_WIN32 flag no longer used */
ares_init_flags = flags;
return ARES_SUCCESS;
}
int ares_library_init(int flags)
{
acquire_lock(&ares_init_lock);
int res = ares_library_init_unsafe(flags);
release_lock(&ares_init_lock);
return res;
}
int ares_library_init_mem(int flags,
void *(*amalloc)(size_t size),
void (*afree)(void *ptr),
void *(*arealloc)(void *ptr, size_t size))
{
if (amalloc)
ares_malloc = amalloc;
if (arealloc)
ares_realloc = arealloc;
if (afree)
ares_free = afree;
return ares_library_init(flags);
}
void ares_library_cleanup_unsafe(void)
{
if (!ares_initialized)
return;
ares_initialized--;
if (ares_initialized)
return;
/* NOTE: ARES_LIB_INIT_WIN32 flag no longer used */
#if defined(ANDROID) || defined(__ANDROID__)
ares_library_cleanup_android();
#endif
ares_init_flags = ARES_LIB_INIT_NONE;
ares_malloc = malloc;
ares_realloc = realloc;
ares_free = free;
}
void ares_library_cleanup(void)
{
acquire_lock(&ares_init_lock);
ares_library_cleanup_unsafe();
release_lock(&ares_init_lock);
}
int ares_library_initialized_unsafe(void)
{
#ifdef USE_WINSOCK
if (!ares_initialized)
return ARES_ENOTINITIALIZED;
#endif
return ARES_SUCCESS;
}
int ares_library_initialized(void)
{
acquire_lock(&ares_init_lock);
int res = ares_library_initialized_unsafe();
release_lock(&ares_init_lock);
return res;
}
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