Content-type: text/html Man page of aiowait

aiowait

Section: Asynchronous I/O Library Functions (3AIO)
Updated: 4 Oct 2004
Index Return to Main Contents
 

NAME

aiowait - wait for completion of asynchronous I/O operation  

SYNOPSIS

cc [ flag... ] file... -laio [ library... ]
#include <sys/asynch.h>
#include <sys/time.h>

aio_result_t *aiowait(const struct timeval *timeout);  

DESCRIPTION

The aiowait() function suspends the calling process until one of its outstanding asynchronous I/O operations completes, providing a synchronous method of notification.

If timeout is a non-zero pointer, it specifies a maximum interval to wait for the completion of an asynchronous I/O operation. If timeout is a zero pointer, aiowait() blocks indefinitely. To effect a poll, the timeout parameter should be non-zero, pointing to a zero-valued timeval structure.

The timeval structure is defined in <sys/time.h> and contains the following members:

long  tv_sec;           /* seconds */
long  tv_usec;          /* and microseconds */


   

RETURN VALUES

Upon successful completion, aiowait() returns a pointer to the result structure used when the completed asynchronous I/O operation was requested. Upon failure, aiowait() returns -1 and sets errno to indicate the error. aiowait() returns 0 if the time limit expires.  

ERRORS

The aiowait() function will fail if:

EFAULT The timeout argument points to an address outside the address space of the requesting process. See NOTES.

EINTR The execution of aiowait() was interrupted by a signal.

EINVAL There are no outstanding asynchronous I/O requests.

EINVAL The tv_secs member of the timeval structure pointed to by timeout is less than 0 or the tv_usecs member is greater than the number of seconds in a microsecond.

 

ATTRIBUTES

See attributes (5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
MT-LevelSafe

 

SEE ALSO

aiocancel(3AIO), aioread(3AIO), attributes(5)  

NOTES

The aiowait() function is the only way to dequeue an asynchronous notification. It can be used either inside a SIGIO signal handler or in the main program. One SIGIO signal can represent several queued events.

Passing an illegal address as timeout will result in setting errno to EFAULT only if detected by the application process.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ERRORS
ATTRIBUTES
SEE ALSO
NOTES

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Time: 02:39:08 GMT, October 02, 2010