aio_error(3p) [centos man page]
AIO_ERROR(3P) POSIX Programmer's Manual AIO_ERROR(3P) PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
aio_error - retrieve errors status for an asynchronous I/O operation (REALTIME) SYNOPSIS
#include <aio.h> int aio_error(const struct aiocb *aiocbp); DESCRIPTION
The aio_error() function shall return 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(), write(), fdatasync(), or fsync() operation. If the operation has not yet completed, then the error status shall be equal to [EINPROGRESS]. RETURN VALUE
If the asynchronous I/O operation has completed successfully, then 0 shall be returned. If the asynchronous operation has completed unsuc- cessfully, then the error status, as described for read(), write(), fdatasync(), and fsync(), shall be returned. If the asynchronous I/O operation has not yet completed, then [EINPROGRESS] shall be 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. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
The aio_error() function is part of the Asynchronous Input and Output option and need not be available on all implementations. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
aio_cancel(), aio_fsync(), aio_read(), aio_return(), aio_write(), close(), exec(), exit(), fork(), lio_listio(), lseek(), read() , the Base Definitions volume of IEEE Std 1003.1-2001, <aio.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 AIO_ERROR(3P)
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AIO_CANCEL(3P) POSIX Programmer's Manual AIO_CANCEL(3P) PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
aio_cancel - cancel an asynchronous I/O request (REALTIME) SYNOPSIS
#include <aio.h> int aio_cancel(int fildes, struct aiocb *aiocbp); DESCRIPTION
The aio_cancel() function shall attempt to cancel one or more asynchronous I/O requests currently outstanding against file descriptor fildes. The aiocbp argument points to the asynchronous I/O control block for a particular request to be canceled. If aiocbp is NULL, then all outstanding cancelable asynchronous I/O requests against fildes shall be canceled. Normal asynchronous notification shall occur for asynchronous I/O operations that are successfully canceled. If there are requests that cannot be canceled, then the normal asynchronous completion process shall take place for those requests when they are completed. For requested operations that are successfully canceled, the associated error status shall be set to [ECANCELED] and the return status shall be -1. For requested operations that are not successfully canceled, the aiocbp shall not be modified by aio_cancel(). If aiocbp is not NULL, then if fildes does not have the same value as the file descriptor with which the asynchronous operation was initi- ated, unspecified results occur. Which operations are cancelable is implementation-defined. RETURN VALUE
The aio_cancel() function shall return the value AIO_CANCELED to the calling process if the requested operation(s) were canceled. The value AIO_NOTCANCELED shall be returned if at least one of the requested operation(s) cannot be canceled because it is in progress. In this case, the state of the other operations, if any, referenced in the call to aio_cancel() is not indicated by the return value of aio_cancel(). The application may determine the state of affairs for these operations by using aio_error(). The value AIO_ALLDONE is returned if all of the operations have already completed. Otherwise, the function shall return -1 and set errno to indicate the error. ERRORS
The aio_cancel() function shall fail if: EBADF The fildes argument is not a valid file descriptor. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
The aio_cancel() function is part of the Asynchronous Input and Output option and need not be available on all implementations. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
aio_read(), aio_write(), the Base Definitions volume of IEEE Std 1003.1-2001, <aio.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 AIO_CANCEL(3P)