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// Copyright (C) 2026 UnionTech Software Technology Co., Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qwaylandpipewritehelper_p.h"
#include <QtCore/private/qcore_unix_p.h>
QT_BEGIN_NAMESPACE
QWaylandPipeWriteHelper::SafeWriteResult
QWaylandPipeWriteHelper::safeWriteWithTimeout(int fd,
const char *data,
qsizetype len,
qsizetype chunkSize,
std::chrono::nanoseconds timeout)
{
if (len == 0)
return SafeWriteResult::Ok;
struct pollfd pfd;
pfd.fd = fd;
pfd.events = POLLOUT;
QDeadlineTimer deadline(timeout);
qsizetype offset = 0;
while (offset < len) {
int ready = qt_safe_poll(&pfd, 1, deadline);
if (ready < 0) {
return SafeWriteResult::Error;
} else if (ready == 0 || deadline.hasExpired()) {
return SafeWriteResult::Timeout;
} else {
const qsizetype toWrite = qMin(chunkSize, len - offset);
ssize_t n = qt_safe_write_nosignal(fd, data + offset, toWrite);
if (n > 0) {
offset += n;
continue;
} else if (n < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK)
continue;
if (errno == EPIPE)
return SafeWriteResult::Closed;
return SafeWriteResult::Error;
}
}
}
return SafeWriteResult::Ok;
}
QT_END_NAMESPACE