strerror.c revision 193149
1/* 2 * Copyright (C) 2004, 2005, 2007, 2009 Internet Systems Consortium, Inc. ("ISC") 3 * Copyright (C) 2001 Internet Software Consortium. 4 * 5 * Permission to use, copy, modify, and/or 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 WITH 10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 15 * PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18/* $Id: strerror.c,v 1.8.332.2 2009/02/16 23:47:15 tbox Exp $ */ 19 20/*! \file */ 21 22#include <config.h> 23 24#include <stdio.h> 25#include <string.h> 26 27#include <isc/mutex.h> 28#include <isc/once.h> 29#include <isc/print.h> 30#include <isc/strerror.h> 31#include <isc/util.h> 32 33#ifdef HAVE_STRERROR 34/*% 35 * We need to do this this way for profiled locks. 36 */ 37static isc_mutex_t isc_strerror_lock; 38static void init_lock(void) { 39 RUNTIME_CHECK(isc_mutex_init(&isc_strerror_lock) == ISC_R_SUCCESS); 40} 41#else 42extern const char * const sys_errlist[]; 43extern const int sys_nerr; 44#endif 45 46void 47isc__strerror(int num, char *buf, size_t size) { 48#ifdef HAVE_STRERROR 49 char *msg; 50 unsigned int unum = (unsigned int)num; 51 static isc_once_t once = ISC_ONCE_INIT; 52 53 REQUIRE(buf != NULL); 54 55 RUNTIME_CHECK(isc_once_do(&once, init_lock) == ISC_R_SUCCESS); 56 57 LOCK(&isc_strerror_lock); 58 msg = strerror(num); 59 if (msg != NULL) 60 snprintf(buf, size, "%s", msg); 61 else 62 snprintf(buf, size, "Unknown error: %u", unum); 63 UNLOCK(&isc_strerror_lock); 64#else 65 unsigned int unum = (unsigned int)num; 66 67 REQUIRE(buf != NULL); 68 69 if (num >= 0 && num < sys_nerr) 70 snprintf(buf, size, "%s", sys_errlist[num]); 71 else 72 snprintf(buf, size, "Unknown error: %u", unum); 73#endif 74} 75