1 /* $NetBSD: strerror.c,v 1.4 2014/12/10 04:38:01 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 #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 } 77