contrib/bind-9.2.4rc7/lib/bind/irs/gai_strerror.c

   1 /*
   2  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (c) 2001 by Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  15  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include <port_before.h>
  19 #include <netdb.h>
  20 #include <port_after.h>
  21
  22 #ifdef DO_PTHREADS
  23 #include <pthread.h>
  24 #include <stdlib.h>
  25 #endif
  26
  27 static const char *gai_errlist[] = {
  28         "no error",
  29         "address family not supported for name",/* EAI_ADDRFAMILY */
  30         "temporary failure",                    /* EAI_AGAIN */
  31         "invalid flags",                        /* EAI_BADFLAGS */
  32         "permanent failure",                    /* EAI_FAIL */
  33         "address family not supported",         /* EAI_FAMILY */
  34         "memory failure",                       /* EAI_MEMORY */
  35         "no address",                           /* EAI_NODATA */
  36         "unknown name or service",              /* EAI_NONAME */
  37         "service not supported for socktype",   /* EAI_SERVICE */
  38         "socktype not supported",               /* EAI_SOCKTYPE */
  39         "system failure",                       /* EAI_SYSTEM */
  40         "bad hints",                            /* EAI_BADHINTS */
  41         "bad protocol",                         /* EAI_PROTOCOL */
  42
  43         "unknown error"                         /* Must be last. */
  44 };
  45
  46 static const int gai_nerr = (sizeof(gai_errlist)/sizeof(*gai_errlist));
  47
  48 #define EAI_BUFSIZE 128
  49
  50 const char *
  51 gai_strerror(int ecode) {
  52 #ifndef DO_PTHREADS
  53         static char buf[EAI_BUFSIZE];
  54 #else   /* DO_PTHREADS */
  55         static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
  56         static pthread_key_t key;
  57         static int once = 0;
  58         char *buf;
  59 #endif
  60
  61         if (ecode >= 0 && ecode < (gai_nerr - 1))
  62                 return (gai_errlist[ecode]);
  63
  64 #ifdef DO_PTHREADS
  65         if (!once) {
  66                 pthread_mutex_lock(&lock);
  67                 if (!once++)
  68                         pthread_key_create(&key, free);
  69                 pthread_mutex_unlock(&lock);
  70         }
  71
  72         buf = pthread_getspecific(key);
  73         if (buf == NULL) {
  74                 buf = malloc(EAI_BUFSIZE);
  75                 if (buf == NULL)
  76                         return ("unknown error");
  77                 pthread_setspecific(key, buf);
  78         }
  79 #endif
  80         /*
  81          * XXX This really should be snprintf(buf, EAI_BUFSIZE, ...).
  82          * It is safe until message catalogs are used.
  83          */
  84         sprintf(buf, "%s: %d", gai_errlist[gai_nerr - 1], ecode);
  85         return (buf);
  86 }