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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
#ifndef OPENVPN_COMMON_WRITE_H
#define OPENVPN_COMMON_WRITE_H
#include <unistd.h>
#include <stdlib.h> // defines std::abort()
namespace openvpn {
// like posix write() but retry if full buffer is not written
inline ssize_t write_retry(int fd, const void *buf, size_t count)
{
size_t total = 0;
while (true)
{
const ssize_t status = ::write(fd, buf, count);
if (status < 0)
return status;
if (static_cast<size_t>(status) > count) // should never happen
std::abort();
total += status;
count -= status;
if (!count)
break;
buf = static_cast<const unsigned char *>(buf) + status;
}
return total;
}
} // namespace openvpn
#endif
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