isc_strerror.c revision 259065
1/* 2 * Copyright (C) 2001 Internet Software Consortium. 3 * 4 * Permission to use, copy, modify, and distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM 9 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL 10 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL 11 * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, 12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING 13 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, 14 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 15 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18/* $Id: strerror.c,v 1.3 2001/11/20 01:45:45 gson Exp $ */ 19 20#include <config.h> 21 22#include <stdio.h> 23#include <string.h> 24 25#include <isc/mutex.h> 26#include <isc/once.h> 27#include <isc/print.h> 28#include <isc/strerror.h> 29#include <isc/util.h> 30 31#include "l_stdlib.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 = 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 = 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