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aio_waitcomplete - wait for the next completion of an aio request



      aio_waitcomplete - wait for the next completion of an aio request


      Standard C Library (libc, -lc)


      #include <aio.h>
      aio_waitcomplete(struct aiocb **iocbp, struct timespec *timeout);


      The aio_waitcomplete() function waits for completion of an asynchronous
      I/O request.  Upon completion, aio_waitcomplete() returns the result of
      the function and sets iocbp to point to the structure associated with the
      original request.  If an asynchronous I/O request is completed before
      aio_waitcomplete() is called, it returns immediately with the completed
      If timeout is a non-NULL pointer, it specifies a maximum interval to wait
      for a asynchronous I/O request to complete.  If timeout is a NULL
      pointer, aio_waitcomplete() waits indefinitely.  To effect a poll, the
      timeout argument should be non-NULL, pointing to a zero-valued timeval
      The aio_waitcomplete() function also serves the function of aio_return(),
      thus aio_return() should not be called for the control block returned in
      If an asynchronous I/O request has completed, iocbp is set to point to
      the control block passed with the original request, and the status is
      returned as described in read(2), write(2), or fsync(2).  On failure,
      aio_waitcomplete() returns -1, sets iocbp to NULL and sets errno to indi‐
      cate the error condition.


      The aio_waitcomplete() function fails if:
      [EINVAL]           The specified time limit is invalid.
      [EAGAIN]           The process has not yet called aio_read() or
      [EINTR]            A signal was delivered before the timeout expired and
                         before any asynchronous I/O requests completed.
      [EINPROGRESS]      The specified time limit expired before any asyn‐
                         chronous I/O requests completed.
      aio_cancel(2), aio_error(2), aio_read(2), aio_return(2), aio_suspend(2),
      aio_write(2), fsync(2), read(2), write(2)


      The aio_waitcomplete() function is a FreeBSD-specific extension.


      The aio_waitcomplete() function first appeared in FreeBSD 4.0.


      The aio_waitcomplete() function and this manual page were written by
      Christopher M Sedore 〈〉.


Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.

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