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/*
* Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: strerror.c,v 1.8 2007/06/19 23:47:18 tbox Exp $ */
/*! \file */
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <isc/mutex.h>
#include <isc/once.h>
#include <isc/print.h>
#include <isc/strerror.h>
#include <isc/util.h>
#ifdef HAVE_STRERROR
/*%
* We need to do this this way for profiled locks.
*/
static isc_mutex_t isc_strerror_lock;
static void init_lock(void) {
RUNTIME_CHECK(isc_mutex_init(&isc_strerror_lock) == ISC_R_SUCCESS);
}
#else
extern const char * const sys_errlist[];
extern const int sys_nerr;
#endif
void
isc__strerror(int num, char *buf, size_t size) {
#ifdef HAVE_STRERROR
char *msg;
unsigned int unum = num;
static isc_once_t once = ISC_ONCE_INIT;
REQUIRE(buf != NULL);
RUNTIME_CHECK(isc_once_do(&once, init_lock) == ISC_R_SUCCESS);
LOCK(&isc_strerror_lock);
msg = strerror(num);
if (msg != NULL)
snprintf(buf, size, "%s", msg);
else
snprintf(buf, size, "Unknown error: %u", unum);
UNLOCK(&isc_strerror_lock);
#else
unsigned int unum = num;
REQUIRE(buf != NULL);
if (num >= 0 && num < sys_nerr)
snprintf(buf, size, "%s", sys_errlist[num]);
else
snprintf(buf, size, "Unknown error: %u", unum);
#endif
}
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