netty_unix_errors.c — netty Source File

Source Code

/*
 * Copyright 2015 The Netty Project
 *
 * The Netty Project licenses this file to you 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:
 *
 *   https://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.
 */
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <jni.h>
#include "netty_unix_errors.h"
#include "netty_unix_jni.h"
#include "netty_unix_util.h"
#include "netty_jni_util.h"

#define ERRORS_CLASSNAME "io/netty/channel/unix/ErrorsStaticallyReferencedJniMethods"

static jweak channelExceptionClassWeak = NULL;
static jclass oomErrorClass = NULL;
static jclass runtimeExceptionClass = NULL;
static jclass ioExceptionClass = NULL;
static jclass portUnreachableExceptionClass = NULL;
static jclass closedChannelExceptionClass = NULL;
static jmethodID closedChannelExceptionMethodId = NULL;

/**
 Our `strerror_r` wrapper makes sure that the function is XSI compliant,
 even on platforms where the GNU variant is exposed.
 Note: `strerrbuf` must be initialized to all zeros prior to calling this function.
 XSI or GNU functions do not have such a requirement, but our wrappers do.

 Android exposes the XSI variant by default, see
 https://cs.android.com/android/platform/superproject/+/android16-release:bionic/libc/include/string.h;l=145?q=string.h
 */
#if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600 || __APPLE__ || __ANDROID__) && ! _GNU_SOURCE
    static inline int strerror_r_xsi(int errnum, char *strerrbuf, size_t buflen) {
        return strerror_r(errnum, strerrbuf, buflen);
    }
#else
    static inline int strerror_r_xsi(int errnum, char *strerrbuf, size_t buflen) {
        char* tmp = strerror_r(errnum, strerrbuf, buflen);
        if (strerrbuf[0] == '\0') {
            // Our output buffer was not used. Copy from tmp.
            strncpy(strerrbuf, tmp, buflen - 1); // Use (buflen - 1) to avoid overwriting terminating \0.
        }
        if (errno != 0) {
            return -1;
        }
        return 0;
    }
#endif
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