cython

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# https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_uio.h.html
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from posix.types cimport off_t
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cdef extern from "<sys/uio.h>" nogil:
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    cdef struct iovec:
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        void  *iov_base
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        size_t iov_len
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    ssize_t readv (int fd, const iovec *iov, int iovcnt)
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    ssize_t writev(int fd, const iovec *iov, int iovcnt)
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    # Linux-specific, https://man7.org/linux/man-pages/man2/readv.2.html
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    ssize_t preadv (int fd, const iovec *iov, int iovcnt, off_t offset)
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    ssize_t pwritev(int fd, const iovec *iov, int iovcnt, off_t offset)
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    enum: RWF_DSYNC
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    enum: RWF_HIPRI
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    enum: RWF_SYNC
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    enum: RWF_NOWAIT
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    enum: RWF_APPEND
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    ssize_t preadv2 (int fd, const iovec *iov, int iovcnt, off_t offset, int flags)
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    ssize_t pwritev2(int fd, const iovec *iov, int iovcnt, off_t offset, int flags)
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