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// Copyright (c) 2021-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <util/tokenpipe.h>
#include <bitcoin-build-config.h> // IWYU pragma: keep
#ifndef WIN32
#include <errno.h>
#include <fcntl.h>
#include <optional>
#include <unistd.h>
TokenPipeEnd TokenPipe::TakeReadEnd()
{
TokenPipeEnd res(m_fds[0]);
m_fds[0] = -1;
return res;
}
TokenPipeEnd TokenPipe::TakeWriteEnd()
{
TokenPipeEnd res(m_fds[1]);
m_fds[1] = -1;
return res;
}
TokenPipeEnd::TokenPipeEnd(int fd) : m_fd(fd)
{
}
TokenPipeEnd::~TokenPipeEnd()
{
Close();
}
int TokenPipeEnd::TokenWrite(uint8_t token)
{
while (true) {
ssize_t result = write(m_fd, &token, 1);
if (result < 0) {
// Failure. It's possible that the write was interrupted by a signal,
// in that case retry.
if (errno != EINTR) {
return TS_ERR;
}
} else if (result == 0) {
return TS_EOS;
} else { // ==1
return 0;
}
}
}
int TokenPipeEnd::TokenRead()
{
uint8_t token;
while (true) {
ssize_t result = read(m_fd, &token, 1);
if (result < 0) {
// Failure. Check if the read was interrupted by a signal,
// in that case retry.
if (errno != EINTR) {
return TS_ERR;
}
} else if (result == 0) {
return TS_EOS;
} else { // ==1
return token;
}
}
return token;
}
void TokenPipeEnd::Close()
{
if (m_fd != -1) close(m_fd);
m_fd = -1;
}
std::optional<TokenPipe> TokenPipe::Make()
{
int fds[2] = {-1, -1};
#if HAVE_O_CLOEXEC && HAVE_DECL_PIPE2
if (pipe2(fds, O_CLOEXEC) != 0) {
return std::nullopt;
}
#else
if (pipe(fds) != 0) {
return std::nullopt;
}
#endif
return TokenPipe(fds);
}
TokenPipe::~TokenPipe()
{
Close();
}
void TokenPipe::Close()
{
if (m_fds[0] != -1) close(m_fds[0]);
if (m_fds[1] != -1) close(m_fds[1]);
m_fds[0] = m_fds[1] = -1;
}
#endif // WIN32
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