Gio.pollable_stream_read
Description: Reference for Gio.pollable_stream_read

### Function

# Giopollable_stream_read

since: 2.34

#### Declaration [src]

    gssize
    g_pollable_stream_read (
      GInputStream* stream,
      void* buffer,
      gsize count,
      gboolean blocking,
      GCancellable* cancellable,
      GError** error
    )

#### Description [src]

Tries to read from `stream`, as with `g_input_stream_read()` (if `blocking` is `TRUE`) or `g_pollable_input_stream_read_nonblocking()` (if `blocking` is `FALSE`). This can be used to more easily share code between blocking and non-blocking implementations of a method.

If `blocking` is `FALSE`, then `stream` must be a `GPollableInputStream` for which `g_pollable_input_stream_can_poll()` returns `TRUE`, or else the behavior is undefined. If `blocking` is `TRUE`, then `stream` does not need to be a `GPollableInputStream`.

Available since: 2.34

#### Parameters

`stream`

  Type: `GInputStream`

  A `GInputStream`.

  The data is owned by the caller of the function.

`buffer`

  Type: An array of `guint8`

  A buffer to read data into.

  The length of the array is specified in the `count` argument.
  The data is owned by the caller of the function.

`count`

  Type: `gsize`

  The number of bytes to read.

`blocking`

  Type: `gboolean`

  Whether to do blocking I/O.

`cancellable`

  Type: `GCancellable`

  Optional `GCancellable` object, `NULL` to ignore.

  The argument can be `NULL`.
  The data is owned by the caller of the function.

`error`

  Type: `GError **`

  The return location for a recoverable error.

  The argument can be `NULL`.
  If the return location is not `NULL`, then you must initialize it to a `NULL` `GError*`.
  The argument will be left initialized to `NULL` by the function if there are no errors.
  In case of error, the argument will be set to a newly allocated `GError`; the caller will take ownership of the data, and be responsible for freeing it.

#### Return value

Type: `gssize`

The number of bytes read, or -1 on error.