platform_system_core/adb/adb_io.h

/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * 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.
 */

#ifndef ADB_IO_H
#define ADB_IO_H

#include <sys/types.h>

#include <string>

// Sends the protocol "OKAY" message.
bool SendOkay(int fd);

// Sends the protocol "FAIL" message, with the given failure reason.
bool SendFail(int fd, const std::string& reason);

// Writes a protocol-format string; a four hex digit length followed by the string data.
bool SendProtocolString(int fd, const std::string& s);

/*
 * Reads exactly len bytes from fd into buf.
 *
 * Returns false if there is an error or if EOF was reached before len bytes
 * were read. If EOF was found, errno will be set to 0.
 *
 * If this function fails, the contents of buf are undefined.
 */
bool ReadFdExactly(int fd, void *buf, size_t len);

/*
 * Writes exactly len bytes from buf to fd.
 *
 * Returns false if there is an error or if the fd was closed before the write
 * completed. If the other end of the fd (such as in a socket, pipe, or fifo),
 * is closed, errno will be set to 0.
 */
bool WriteFdExactly(int fd, const void* buf, size_t len);

// Same as above, but for strings.
bool WriteFdExactly(int fd, const char* s);
bool WriteFdExactly(int fd, const std::string& s);

// Same as above, but formats the string to send.
bool WriteFdFmt(int fd, const char* fmt, ...) __attribute__((__format__(__printf__, 2, 3)));

#endif /* ADB_IO_H */