Content-type: text/html Man page of aio_error

aio_error

Section: Realtime Library Functions (3RT)
Updated: 28 Jun 2002
Index Return to Main Contents
 

NAME

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

SYNOPSIS

cc [ flag... ] file... -lrt [ library... ]
#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 will fail if:

ENOSYS The aio_error() function is not supported by the system.

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 TYPEATTRIBUTE VALUE
Interface StabilityStandard
MT-LevelAsync-Signal-Safe

 

SEE ALSO

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

NOTES

Solaris 2.6 was the first release to support the Asynchronous Input and Output option. Prior to this release, this function always returned -1 and set errno to ENOSYS.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ERRORS
USAGE
EXAMPLES
ATTRIBUTES
SEE ALSO
NOTES

This document was created by man2html, using the manual pages.
Time: 02:39:04 GMT, October 02, 2010