AIO_SUSPEND(2)            FreeBSD System Calls Manual           AIO_SUSPEND(2)

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

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <aio.h>

     int
     aio_suspend(const struct aiocb *const iocbs[], int niocb,
         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 iocbs argument is an array of niocb 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.

     [EINVAL]           The iocbs argument contains more asynchronous I/O
                        requests than the vfs.aio.max_aio_queue_per_proc
                        sysctl(8) variable, or at least one of the requests is
                        not valid.

     [EINTR]            the suspend was interrupted by a signal.

SEE ALSO
     aio_cancel(2), aio_error(2), aio_return(2), aio_waitcomplete(2),
     aio_write(2), aio(4)

STANDARDS
     The aio_suspend() system call is expected to conform to the IEEE Std
     1003.1 ("POSIX.1") standard.

HISTORY
     The aio_suspend() system call first appeared in FreeBSD 3.0.

AUTHORS
     This manual page was written by Wes Peters <wes@softweyr.com>.

FreeBSD 13.1-RELEASE-p6        October 23, 2017        FreeBSD 13.1-RELEASE-p6