May 4, 2007 AIO_SUSPEND 3

### NAME

aio_suspend - suspend until asynchronous I/O operations or timeout complete (REALTIME)

### LIBRARY

POSIX Real-time Library (librt, -lrt)

### SYNOPSIS

```int` aio_suspend(``const struct aiocb * const list[]`int nent``, const struct timespec * timeout`)

### DESCRIPTION

The aio_suspend(``) system call suspends the calling process until at least one of the specified asynchronous I/O requests have completed, a signal is delivered, or the ```timeout` has passed.

The ```list` argument is an array of ```nent` pointers to asynchronous I/O requests. Array members containing null pointers will be silently ignored.

If ```timeout` is not a null pointer, it specifies a maximum interval to suspend. If ```timeout` is a null pointer, the suspend blocks indefinitely. To effect a poll, the ```timeout` should point to a zero-value timespec structure.

### RETURN VALUES

If one or more of the specified asynchronous I/O requests have completed, aio_suspend(``) returns 0. Otherwise it returns -1 and sets errno to indicate the error, as enumerated below.

### ERRORS

The aio_suspend(``) system call will fail if:

[```EAGAIN`]
  The ```timeout` expired before any I/O requests completed.

[```EINTR`]
  The suspend was interrupted by a signal.

[```EINVAL`]
  The ```list` argument contains more than ```AIO_LISTIO_MAX` asynchronous I/O requests, or at least one of the requests is not valid.

### SEE ALSO

aio_cancel(3), aio_error(3), aio_return(3), aio_write(3)

### STANDARDS

The aio_suspend(``) system call is expected to conform to the IEEE Std 1003.1-2001 (``POSIX.1'') standard.

### HISTORY

The aio_suspend(``) system call first appeared in NetBSD5.0.