AIO_ERROR(3C) Standard C Library Functions AIO_ERROR(3C)


NAME


aio_error - retrieve errors status for an asynchronous I/O operation

SYNOPSIS


#include <aio.h>

int aio_error(const struct aiocb *aiocbp);


DESCRIPTION


The aio_error() function returns the error status associated with the
aiocb structure referenced by the aiocbp argument. The error status for
an asynchronous I/O operation is the errno value that would be set by the
corresponding read(2), write(2), or fsync(3C) operation. If the
operation has not yet completed, then the error status will be equal to
EINPROGRESS.

RETURN VALUES


If the asynchronous I/O operation has completed successfully, then 0 is
returned. If the asynchronous operation has completed unsuccessfully,
then the error status, as described for read(2), write(2), and fsync(3C),
is returned. If the asynchronous I/O operation has not yet completed,
then EINPROGRESS is returned.

ERRORS


The aio_error() function may fail if:

EINVAL
The aiocbp argument does not refer to an asynchronous operation
whose return status has not yet been retrieved.


USAGE


The aio_error() function has a transitional interface for 64-bit file
offsets. See lf64(5).

EXAMPLES


Example 1: The following is an example of an error handling routine using


the aio_error() function.

#include <aio.h>
#include <errno.h>
#include <signal.h>
struct aiocb my_aiocb;
struct sigaction my_sigaction;
void my_aio_handler(int, siginfo_t *, void *);
...
my_sigaction.sa_flags = SA_SIGINFO;
my_sigaction.sa_sigaction = my_aio_handler;
sigemptyset(&my_sigaction.sa_mask);
(void) sigaction(SIGRTMIN, &my_sigaction, NULL);
...
my_aiocb.aio_sigevent.sigev_notify = SIGEV_SIGNAL;
my_aiocb.aio_sigevent.sigev_signo = SIGRTMIN;
my_aiocb.aio_sigevent.sigev_value.sival_ptr = &myaiocb;
...
(void) aio_read(&my_aiocb);
...
void
my_aio_handler(int signo, siginfo_t *siginfo, void *context) {
int my_errno;
struct aiocb *my_aiocbp;

my_aiocbp = siginfo->si_value.sival_ptr;
if ((my_errno = aio_error(my_aiocb)) != EINPROGRESS) {
int my_status = aio_return(my_aiocb);
if (my_status >= 0){ /* start another operation */
...
} else { /* handle I/O error */
...
}
}
}


ATTRIBUTES


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


+--------------------+-------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-------------------+
|Interface Stability | Committed |
+--------------------+-------------------+
|MT-Level | Async-Signal-Safe |
+--------------------+-------------------+
|Standard | See standards(5). |
+--------------------+-------------------+

SEE ALSO


_Exit(2), close(2), fork(2), lseek(2), read(2), write(2), aio.h(3HEAD),
aio_cancel(3C), aio_fsync(3C), aio_read(3C), aio_return(3C),
aio_write(3C), lio_listio(3C), signal.h(3HEAD), attributes(5), lf64(5),
standards(5)


February 5, 2008 AIO_ERROR(3C)