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// Copyright (c) 2010 Baidu, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Author: Ge,Jun (gejun@baidu.com)
// Date: Fri Sep 10 13:34:25 CST 2010
#include <errno.h> // errno
#include <string.h> // strerror_r
#include <stdlib.h> // EXIT_FAILURE
#include <stdio.h> // snprintf
#include <pthread.h> // pthread_mutex_t
#include <error.h> // error
#include "butil/scoped_lock.h" // BAIDU_SCOPED_LOCK
namespace butil {
const int ERRNO_BEGIN = -32768;
const int ERRNO_END = 32768;
static const char* errno_desc[ERRNO_END - ERRNO_BEGIN] = {};
static pthread_mutex_t modify_desc_mutex = PTHREAD_MUTEX_INITIALIZER;
const size_t ERROR_BUFSIZE = 64;
__thread char tls_error_buf[ERROR_BUFSIZE];
int DescribeCustomizedErrno(
int error_code, const char* error_name, const char* description) {
BAIDU_SCOPED_LOCK(modify_desc_mutex);
if (error_code < ERRNO_BEGIN || error_code >= ERRNO_END) {
error(EXIT_FAILURE, 0,
"Fail to define %s(%d) which is out of range, abort.",
error_name, error_code);
}
const char* desc = errno_desc[error_code - ERRNO_BEGIN];
if (desc) {
if (strcmp(desc, description) == 0) {
fprintf(stderr, "WARNING: Detected shared library loading\n");
return -1;
}
} else {
desc = strerror_r(error_code, tls_error_buf, ERROR_BUFSIZE);
if (desc && strncmp(desc, "Unknown error", 13) != 0) {
error(EXIT_FAILURE, 0,
"Fail to define %s(%d) which is already defined as `%s', abort.",
error_name, error_code, desc);
}
}
errno_desc[error_code - ERRNO_BEGIN] = description;
return 0; // must
}
} // namespace butil
const char* berror(int error_code) {
if (error_code == -1) {
return "General error -1";
}
if (error_code >= butil::ERRNO_BEGIN && error_code < butil::ERRNO_END) {
const char* s = butil::errno_desc[error_code - butil::ERRNO_BEGIN];
if (s) {
return s;
}
s = strerror_r(error_code, butil::tls_error_buf, butil::ERROR_BUFSIZE);
if (s) { // strerror_r returns NULL if error_code is unknown
return s;
}
}
snprintf(butil::tls_error_buf, butil::ERROR_BUFSIZE,
"Unknown error %d", error_code);
return butil::tls_error_buf;
}
const char* berror() {
return berror(errno);
}