1135446Strhodes/* 2193149Sdougb * Copyright (C) 2004, 2005, 2007, 2009 Internet Systems Consortium, Inc. ("ISC") 3135446Strhodes * Copyright (C) 2001 Internet Software Consortium. 4135446Strhodes * 5193149Sdougb * Permission to use, copy, modify, and/or distribute this software for any 6135446Strhodes * purpose with or without fee is hereby granted, provided that the above 7135446Strhodes * copyright notice and this permission notice appear in all copies. 8135446Strhodes * 9135446Strhodes * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 10135446Strhodes * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 11135446Strhodes * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 12135446Strhodes * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 13135446Strhodes * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 14135446Strhodes * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 15135446Strhodes * PERFORMANCE OF THIS SOFTWARE. 16135446Strhodes */ 17135446Strhodes 18234010Sdougb/* $Id: strerror.c,v 1.10 2009/02/16 23:48:04 tbox Exp $ */ 19135446Strhodes 20170222Sdougb/*! \file */ 21170222Sdougb 22135446Strhodes#include <config.h> 23135446Strhodes 24135446Strhodes#include <stdio.h> 25135446Strhodes#include <string.h> 26135446Strhodes 27135446Strhodes#include <isc/mutex.h> 28135446Strhodes#include <isc/once.h> 29135446Strhodes#include <isc/print.h> 30135446Strhodes#include <isc/strerror.h> 31135446Strhodes#include <isc/util.h> 32135446Strhodes 33135446Strhodes#ifdef HAVE_STRERROR 34170222Sdougb/*% 35135446Strhodes * We need to do this this way for profiled locks. 36135446Strhodes */ 37135446Strhodesstatic isc_mutex_t isc_strerror_lock; 38135446Strhodesstatic void init_lock(void) { 39135446Strhodes RUNTIME_CHECK(isc_mutex_init(&isc_strerror_lock) == ISC_R_SUCCESS); 40135446Strhodes} 41135446Strhodes#else 42135446Strhodesextern const char * const sys_errlist[]; 43135446Strhodesextern const int sys_nerr; 44135446Strhodes#endif 45135446Strhodes 46135446Strhodesvoid 47135446Strhodesisc__strerror(int num, char *buf, size_t size) { 48135446Strhodes#ifdef HAVE_STRERROR 49135446Strhodes char *msg; 50193149Sdougb unsigned int unum = (unsigned int)num; 51135446Strhodes static isc_once_t once = ISC_ONCE_INIT; 52135446Strhodes 53135446Strhodes REQUIRE(buf != NULL); 54135446Strhodes 55135446Strhodes RUNTIME_CHECK(isc_once_do(&once, init_lock) == ISC_R_SUCCESS); 56135446Strhodes 57135446Strhodes LOCK(&isc_strerror_lock); 58135446Strhodes msg = strerror(num); 59135446Strhodes if (msg != NULL) 60135446Strhodes snprintf(buf, size, "%s", msg); 61135446Strhodes else 62135446Strhodes snprintf(buf, size, "Unknown error: %u", unum); 63135446Strhodes UNLOCK(&isc_strerror_lock); 64135446Strhodes#else 65193149Sdougb unsigned int unum = (unsigned int)num; 66135446Strhodes 67135446Strhodes REQUIRE(buf != NULL); 68135446Strhodes 69135446Strhodes if (num >= 0 && num < sys_nerr) 70135446Strhodes snprintf(buf, size, "%s", sys_errlist[num]); 71135446Strhodes else 72135446Strhodes snprintf(buf, size, "Unknown error: %u", unum); 73135446Strhodes#endif 74135446Strhodes} 75