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* Copyright 2016, 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#pragma once
#include <sys/cdefs.h>
#include <sys/types.h>
#include <android-base/unique_fd.h>
// *** WARNING ***
// tombstoned's sockets are SOCK_SEQPACKET sockets.
// Short reads are treated as errors and short writes are assumed to not happen.
// Sends a packet with an attached fd.
ssize_t send_fd(int sockfd, const void* _Nonnull data, size_t len, android::base::unique_fd fd);
// Receives a packet and optionally, its attached fd.
// If out_fd is non-null, packets can optionally have an attached fd.
// If out_fd is null, received packets must not have an attached fd.
// Errors:
// EOVERFLOW: sockfd is SOCK_DGRAM or SOCK_SEQPACKET and buffer is too small.
// The first len bytes of the packet are stored in data, but the
// rest of the packet is dropped.
// ERANGE: too many file descriptors were attached to the packet.
// ENOMSG: not enough file descriptors were attached to the packet.
// plus any errors returned by the underlying recvmsg.
ssize_t recv_fd(int sockfd, void* _Nonnull data, size_t len,
android::base::unique_fd* _Nullable out_fd);