37 lines
1.3 KiB
C
37 lines
1.3 KiB
C
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/* sendfile -- copy data directly from one file descriptor to another
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Copyright (C) 2002-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/sendfile.h>
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#include <stddef.h>
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/* Send COUNT bytes from file associated with IN_FD starting at OFFSET to
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descriptor OUT_FD. */
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ssize_t
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sendfile (int out_fd, int in_fd, off_t *offset, size_t count)
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{
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if (offset == NULL || sizeof (off_t) == sizeof (off64_t))
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return __sendfile64 (out_fd, in_fd, (off64_t *) offset, count);
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else
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{
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off64_t ofs = *offset;
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ssize_t ret = __sendfile64 (out_fd, in_fd, &ofs, count);
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*offset = ofs;
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return ret;
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}
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}
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