76 lines
1.2 KiB
C++
76 lines
1.2 KiB
C++
/*
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* \brief Plugin implementation
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* \author Josef Soentgen
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* \date 2012-04-10
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*/
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/*
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* Copyright (C) 2010-2012 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#include <sys/uio.h>
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#include <limits.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <stdio.h>
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enum { MAX_BUFFER_LEN = 2048 };
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extern "C" int _writev(int d, const struct iovec *iov, int iovcnt)
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{
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char buffer[MAX_BUFFER_LEN];
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char *v, *b;
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ssize_t written;
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size_t v_len, _len;
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int i;
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if (iovcnt < 1 || iovcnt > IOV_MAX) {
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return -EINVAL;
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}
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for (i = 0; i < iovcnt; i++)
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v_len += iov->iov_len;
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if (v_len > SSIZE_MAX) {
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return -EINVAL;
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}
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b = buffer;
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while (iovcnt) {
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v = static_cast<char *>(iov->iov_base);
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v_len = iov->iov_len;
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while (v_len > 0) {
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if (v_len < sizeof(buffer))
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_len = v_len;
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else
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_len = sizeof(buffer);
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// TODO error check
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memmove(b, v, _len);
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i = write(d, b, _len);
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v += _len;
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v_len -= _len;
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written += i;
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}
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iov++;
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iovcnt--;
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}
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return written;
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}
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extern "C" ssize_t writev(int d, const struct iovec *iov, int iovcnt)
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{
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return _writev(d, iov, iovcnt);
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}
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