AIOWAIT(3C)AIOWAIT(3C)NAMEaiowait - wait for completion of asynchronous I/O operation
aio_result_t *aiowait(const struct timeval *timeout);
The aiowait() function suspends the calling process until one of its
outstanding asynchronous I/O operations completes, providing a synchro‐
nous 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
The timeval structure is defined in <sys/time.h> and contains the fol‐
long tv_sec; /* seconds */
long tv_usec; /* and microseconds */
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 indi‐
cate the error. aiowait() returns 0 if the time limit expires.
The aiowait() function will fail if:
The timeout argument points to an address outside the address
space of the requesting process. See NOTES.
The execution of aiowait() was interrupted by a signal.
There are no outstanding asynchronous I/O requests.
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.
See attributes(5) for descriptions of the following attributes:
│ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
│MT-Level │ Safe │
SEE ALSOaiocancel(3C), aioread(3C), attributes(5)NOTES
The aiowait() function is the only way to dequeue an asynchronous noti‐
fication. 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.
Feb 5, 2008 AIOWAIT(3C)