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Manual Pages  — AIO_SUSPEND


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



Standard C Library (libc, -lc)


#include <aio.h>

aio_suspend(const struct aiocb *const iocbs[], int niocb, const struct timespec *timeout);


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.


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.


The aio_suspend() system call will fail if:
  the timeout expired before any I/O requests completed.
  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.
  the suspend was interrupted by a signal.


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


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


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


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

AIO_SUSPEND (2) Oct 23, 2017

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