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

#include <aio.h>

int aio_error(const struct aiocb *aiocbp);

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.

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.

The aio_error() function may fail if: EINVAL

The aio_error() function has a transitional interface for 64-bit file offsets. See lf64(7).

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 */
 \|.\|.\|.
 }
 }
}

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

Interface Stability Committed

MT-Level Async-Signal-Safe

Standard See standards(7).

_Exit (2), close (2), fork (2), lseek (2), read (2), write (2), aio_cancel (3C), aio_fsync (3C), aio_read (3C), aio_return (3C), aio_write (3C), lio_listio (3C), aio.h (3HEAD), signal.h (3HEAD), attributes (7), lf64 (7), standards (7)