external/bsd/bind/dist/lib/isc/unix/strerror.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004, 2005, 2007, 2009  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 2001  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: strerror.c,v 1.10 2009/02/16 23:48:04 tbox Exp */
  21
  22 /*! \file */
  23
  24 #include <config.h>
  25
  26 #include <stdio.h>
  27 #include <string.h>
  28
  29 #include <isc/mutex.h>
  30 #include <isc/once.h>
  31 #include <isc/print.h>
  32 #include <isc/strerror.h>
  33 #include <isc/util.h>
  34
  35 #ifdef HAVE_STRERROR
  36 /*%
  37  * We need to do this this way for profiled locks.
  38  */
  39 static isc_mutex_t isc_strerror_lock;
  40 static void init_lock(void) {
  41         RUNTIME_CHECK(isc_mutex_init(&isc_strerror_lock) == ISC_R_SUCCESS);
  42 }
  43 #else
  44 extern const char * const sys_errlist[];
  45 extern const int sys_nerr;
  46 #endif
  47
  48 void
  49 isc__strerror(int num, char *buf, size_t size) {
  50 #ifdef HAVE_STRERROR
  51         char *msg;
  52         unsigned int unum = (unsigned int)num;
  53         static isc_once_t once = ISC_ONCE_INIT;
  54
  55         REQUIRE(buf != NULL);
  56
  57         RUNTIME_CHECK(isc_once_do(&once, init_lock) == ISC_R_SUCCESS);
  58
  59         LOCK(&isc_strerror_lock);
  60         msg = strerror(num);
  61         if (msg != NULL)
  62                 snprintf(buf, size, "%s", msg);
  63         else
  64                 snprintf(buf, size, "Unknown error: %u", unum);
  65         UNLOCK(&isc_strerror_lock);
  66 #else
  67         unsigned int unum = (unsigned int)num;
  68
  69         REQUIRE(buf != NULL);
  70
  71         if (num >= 0 && num < sys_nerr)
  72                 snprintf(buf, size, "%s", sys_errlist[num]);
  73         else
  74                 snprintf(buf, size, "Unknown error: %u", unum);
  75 #endif
  76 }