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