mirror of
https://github.com/OpenVPN/openvpn3.git
synced 2024-09-20 20:13:05 +02:00
04b2a3c9b7
Signed-off-by: Samuli Seppänen <samuli@openvpn.net>
51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2016 OpenVPN Technologies, Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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#ifndef OPENVPN_COMMON_WRITE_H
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#define OPENVPN_COMMON_WRITE_H
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#include <unistd.h>
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#include <stdlib.h> // defines std::abort()
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namespace openvpn {
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// like posix write() but retry if full buffer is not written
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inline ssize_t write_retry(int fd, const void *buf, size_t count)
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{
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size_t total = 0;
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while (true)
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{
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const ssize_t status = ::write(fd, buf, count);
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if (status < 0)
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return status;
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if (status > count) // should never happen
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std::abort();
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total += status;
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count -= status;
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if (!count)
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break;
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buf = static_cast<const unsigned char*>(buf) + status;
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}
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return total;
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}
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}
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#endif
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