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.TH AIO_ERROR 3C "Feb 5, 2008"
.SH NAME
aio_error \- retrieve errors status for an asynchronous I/O operation
.SH SYNOPSIS
.LP
.nf
#include <aio.h>

\fBint\fR \fBaio_error\fR(\fBconst struct aiocb *\fR\fIaiocbp\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBaio_error()\fR function returns the error status associated with the
\fBaiocb\fR structure referenced by the \fIaiocbp\fR argument. The error status
for an asynchronous I/O operation is the \fBerrno\fR value that would be set by
the corresponding \fBread\fR(2), \fBwrite\fR(2), or \fBfsync\fR(3C) operation.
If the operation has not yet completed, then the error status will be equal to
\fBEINPROGRESS\fR.
.SH RETURN VALUES
.sp
.LP
If the asynchronous I/O operation has completed successfully, then \fB0\fR is
returned. If the asynchronous operation has completed unsuccessfully, then the
error status, as described for \fBread\fR(2), \fBwrite\fR(2), and
\fBfsync\fR(3C), is returned. If the asynchronous I/O operation has not yet
completed, then \fBEINPROGRESS\fR is returned.
.SH ERRORS
.sp
.LP
The \fBaio_error()\fR function may fail if:
.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
The \fIaiocbp\fR argument does not refer to an asynchronous operation whose
return status has not yet been retrieved.
.RE

.SH USAGE
.sp
.LP
The \fBaio_error()\fR function has a transitional interface for 64-bit file
offsets.  See \fBlf64\fR(7).
.SH EXAMPLES
.LP
\fBExample 1 \fRThe following is an example of an error handling routine using
the \fBaio_error()\fR function.
.sp
.in +2
.nf
#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 */
                     \|.\|.\|.
            }
    }
}
.fi
.in -2

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
_
MT-Level	Async-Signal-Safe
_
Standard	See \fBstandards\fR(7).
.TE

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