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extern ssize_t vmsplice (int __fdout, const struct iovec *__iov,
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size_t __count, unsigned int __flags);
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extern ssize_t splice (int __fdin, __off64_t *__offin, int __fdout,
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__off64_t *__offout, size_t __len,
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extern ssize_t tee (int __fdin, int __fdout, size_t __len,
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# ifndef __USE_FILE_OFFSET64
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extern int fallocate (int __fd, int __mode, __off_t __offset, __off_t __len);