AIO_SUSPEND(3)          NetBSD Library Functions Manual         AIO_SUSPEND(3)

NAME
     aio_suspend -- suspend until asynchronous I/O operations or timeout com-
     plete (REALTIME)

LIBRARY
     POSIX Real-time Library (librt, -lrt)

SYNOPSIS
     #include <aio.h>

     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 sus-
     pend.  If timeout is a null pointer, the suspend blocks indefinitely.  To
     effect a poll, the timeout should point to a zero-value timespec struc-
     ture.

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 indi-
     cate 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 NetBSD 5.0.

NetBSD 5.0_STABLE                 May 4, 2007                NetBSD 5.0_STABLE
