1/* $NetBSD: strerror.c,v 1.6 2020/05/25 20:47:23 christos Exp $ */ 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#include "l_stdlib.h" /* NTP local change */ 36 37#ifdef HAVE_STRERROR 38/*% 39 * We need to do this this way for profiled locks. 40 */ 41static isc_mutex_t isc_strerror_lock; 42static void init_lock(void) { 43 RUNTIME_CHECK(isc_mutex_init(&isc_strerror_lock) == ISC_R_SUCCESS); 44} 45#else 46extern const char * const sys_errlist[]; 47extern const int sys_nerr; 48#endif 49 50void 51isc__strerror(int num, char *buf, size_t size) { 52#ifdef HAVE_STRERROR 53 char *msg; 54 unsigned int unum = (unsigned int)num; 55 static isc_once_t once = ISC_ONCE_INIT; 56 57 REQUIRE(buf != NULL); 58 59 RUNTIME_CHECK(isc_once_do(&once, init_lock) == ISC_R_SUCCESS); 60 61 LOCK(&isc_strerror_lock); 62 msg = strerror(num); 63 if (msg != NULL) 64 snprintf(buf, size, "%s", msg); 65 else 66 snprintf(buf, size, "Unknown error: %u", unum); 67 UNLOCK(&isc_strerror_lock); 68#else 69 unsigned int unum = (unsigned int)num; 70 71 REQUIRE(buf != NULL); 72 73 if (num >= 0 && num < sys_nerr) 74 snprintf(buf, size, "%s", sys_errlist[num]); 75 else 76 snprintf(buf, size, "Unknown error: %u", unum); 77#endif 78} 79