- MongoDB C Driver 1.9.3-dev »
- API Reference »
- mongoc_stream_t

# mongoc_stream_readv()

## Synopsis

    ssize_t
    mongoc_stream_readv (mongoc_stream_t *stream,
                         mongoc_iovec_t *iov,
                         size_t iovcnt,
                         size_t min_bytes,
                         int32_t timeout_msec);

## Parameters

- `stream`: A mongoc_stream_t.
- `iov`: A vector of mongoc_iovec_t.
- `iovcnt`: The number of items in `iov`.
- `min_bytes`: The minimum number of bytes to read or failure will be indicated.
- `timeout_msec`: A timeout in milliseconds, or 0 to indicate non-blocking. A negative value with use the default timeout.

This function is identical to mongoc_stream_read() except that it takes a mongoc_iovec_t to perform gathered I/O.

## Returns

`>= 0` on success, `-1` on failure and `errno` is set.

## See Also

mongoc_stream_read()

mongoc_stream_write()

mongoc_stream_writev()

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