Standard C Library Functions aiofsync(3C)
NAME
aiofsync - asynchronous file synchronization
SYNOPSIS
#include
int aiofsync(int op, struct aiocb *aiocbp);
DESCRIPTION
The aiofsync() function asynchronously forces all I/O
operations associated with the file indicated by the file
descriptor aiofildes member of the aiocb structure refer-
enced by the aiocbp argument and queued at the time of the
call to aiofsync() to the synchronized I/O completion
state. The function call returns when the synchronization
request has been initiated or queued to the file or device
(even when the data cannot be synchronized immediately).
If op is ODSYNC, all currently queued I/O operations are
completed as if by a call to fdatasync(3C); that is, as
defined for synchronized I/O data integrity completion. If
op is OSYNC, all currently queued I/O operations are com-
pleted as if by a call to fsync(3C); that is, as defined for
synchronized I/O file integrity completion. If the
aiofsync() function fails, or if the operation queued by
aiofsync() fails, then, as for fsync(3C) and fdatasync(3C),
outstanding I/O operations are not guaranteed to have been
completed.
If aiofsync() succeeds, then it is only the I/O that was
queued at the time of the call to aiofsync() that is
guaranteed to be forced to the relevant completion state.
The completion of subsequent I/O on the file descriptor is
not guaranteed to be completed in a synchronized fashion.
The aiocbp argument refers to an asynchronous I/O control
block. The aiocbp value may be used as an argument to
aioerror(3C) and aioreturn(3C) in order to determine the
error status and return status, respectively, of the asyn-
chronous operation while it is proceeding. When the request
is queued, the error status for the operation is EINPRO-
GRES. When all data has been successfully transferred, the
error status will be reset to reflect the success or failure
of the operation. If the operation does not complete suc-
cessfully, the error status for the operation will be set to
indicate the error. The aiosigevent member determines the
asynchronous notification to occur when all operations have
achieved synchronized I/O completion (see signal.h(3HEAD)).
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Standard C Library Functions aiofsync(3C)
All other members of the structure referenced by aiocbp are
ignored. If the control block referenced by aiocbp becomes
an illegal address prior to asynchronous I/O completion,
then the behavior is undefined.
If the aiofsync() function fails or the aiocbp indicates an
error condition, data is not guaranteed to have been suc-
cessfully transferred.
If aiocbp is NUL, then no status is returned in aiocbp, and
no signal is generated upon completion of the operation.
RETURN VALUES
The aiofsync() function returns 0 to the calling process if
the I/O operation is successfully queued; otherwise, the
function returns -1 and sets errno to indicate the error.
ERORS
The aiofsync() function will fail if:
EAGAIN The requested asynchronous operation was not
queued due to temporary resource limitations.
EBADF The aiofildes member of the aiocb structure
referenced by the aiocbp argument is not a valid
file descriptor open for writing.
EINVAL The system does not support synchronized I/O for
this file.
EINVAL A value of op other than ODSYNC or OSYNC was
specified.
In the event that any of the queued I/O operations fail,
aiofsync() returns the error condition defined for read(2)
and write(2). The error will be returned in the error status
for the asynchronous fsync(3C) operation, which can be
retrieved using aioerror(3C).
USAGE
The aiofsync() function has a transitional interface for
64-bit file offsets. See lf64(5).
ATRIBUTES
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Standard C Library Functions aiofsync(3C)
See attributes(5) for descriptions of the following attri-
butes:
ATRIBUTE TYPE ATRIBUTE VALUE
Interface Stability Committed
MT-Level MT-Safe
Standard See standards(5).
SEE ALSO
fcntl(2), open(2), read(2), write(2), aioerror(3C),
aioreturn(3C), aio.h(3HEAD), fcntl.h(3HEAD), fdatasync(3C),
fsync(3C), signal.h(3HEAD), attributes(5), lf64(5), stan-
dards(5)
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