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/* Copyright (C) 2002, 2004 MySQL AB
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; version 2
of the License.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA */
/* Thread safe version of gethostbyname_r() */
#include "mysys_priv.h"
#if !defined(MSDOS) && !defined(__WIN__)
#include <netdb.h>
#endif
#include <my_net.h>
/* This file is not needed if my_gethostbyname_r is a macro */
#if !defined(my_gethostbyname_r)
/*
Emulate SOLARIS style calls, not because it's better, but just to make the
usage of getbostbyname_r simpler.
*/
#if defined(HAVE_GETHOSTBYNAME_R)
#if defined(HAVE_GETHOSTBYNAME_R_GLIBC2_STYLE)
struct hostent *my_gethostbyname_r(const char *name,
struct hostent *result, char *buffer,
int buflen, int *h_errnop)
{
struct hostent *hp;
DBUG_ASSERT((size_t) buflen >= sizeof(*result));
if (gethostbyname_r(name,result, buffer, (size_t) buflen, &hp, h_errnop))
return 0;
return hp;
}
#elif defined(HAVE_GETHOSTBYNAME_R_RETURN_INT)
struct hostent *my_gethostbyname_r(const char *name,
struct hostent *result, char *buffer,
int buflen, int *h_errnop)
{
if (gethostbyname_r(name,result,(struct hostent_data *) buffer) == -1)
{
*h_errnop= errno;
return 0;
}
return result;
}
#else
/* gethostbyname_r with similar interface as gethostbyname() */
struct hostent *my_gethostbyname_r(const char *name,
struct hostent *result, char *buffer,
int buflen, int *h_errnop)
{
struct hostent *hp;
DBUG_ASSERT(buflen >= sizeof(struct hostent_data));
hp= gethostbyname_r(name,result,(struct hostent_data *) buffer);
*h_errnop= errno;
return hp;
}
#endif /* GLIBC2_STYLE_GETHOSTBYNAME_R */
#else /* !HAVE_GETHOSTBYNAME_R */
#ifdef THREAD
extern pthread_mutex_t LOCK_gethostbyname_r;
#endif
/*
No gethostbyname_r() function exists.
In this case we have to keep a mutex over the call to ensure that no
other thread is going to reuse the internal memory.
The user is responsible to call my_gethostbyname_r_free() when he
is finished with the structure.
*/
struct hostent *my_gethostbyname_r(const char *name,
struct hostent *result, char *buffer,
int buflen, int *h_errnop)
{
struct hostent *hp;
pthread_mutex_lock(&LOCK_gethostbyname_r);
hp= gethostbyname(name);
*h_errnop= h_errno;
return hp;
}
void my_gethostbyname_r_free()
{
pthread_mutex_unlock(&LOCK_gethostbyname_r);
}
#endif /* !HAVE_GETHOSTBYNAME_R */
#endif /* !my_gethostbyname_r */
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