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aio_write(3c)
Standard C Library Functions aio_write(3C)
NAME
aio_write - asynchronous write to a file
SYNOPSIS
#include <aio.h>
int aio_write(struct aiocb *aiocbp);
DESCRIPTION
The aio_write() function allows the calling process to write
aiocbp→aio_nbytes to the file associated with aiocbp→aio_fildes from
the buffer pointed to by aiocbp→aio_buf. The function call returns when
the write request has been initiated or, at a minimum, queued to the
file or device. If _POSIX_PRIORITIZED_IO is defined and prioritized I/O
is supported for this file, then the asynchronous operation is submit‐
ted at a priority equal to the scheduling priority of the process minus
aiocbp→aio_reqprio. The aiocbp may be used as an argument to
aio_error(3C) and aio_return(3C) in order to determine the error status
and return status, respectively, of the asynchronous operation while it
is proceeding.
The aiocbp argument points to an aiocb structure. If the buffer pointed
to by aiocbp→aio_buf or the control block pointed to by aiocbp becomes
an illegal address prior to asynchronous I/O completion, then the
behavior is undefined.
If O_APPEND is not set for the file descriptor aio_fildes, then the
requested operation takes place at the absolute position in the file as
given by aio_offset, as if lseek(2) were called immediately prior to
the operation with an offset equal to aio_offset and a whence equal to
SEEK_SET. If O_APPEND is set for the file descriptor, write operations
append to the file in the same order as the calls were made. After a
successful call to enqueue an asynchronous I/O operation, the value of
the file offset for the file is unspecified.
The aiocbp→aio_sigevent structure defines what asynchronous notifica‐
tion is to occur when the asynchronous operation completes, as speci‐
fied in signal.h(3HEAD).
If SIGEV_MEM sigevent type is specified, the error and return values
are updated in the aiocb_t structure when I/O is completed. Applica‐
tions can get the error value using aio_error(3C) and the return value
using aio_return(3C). For SIGEV_MEM sigevent type requests,
aio_error(3C) and aio_return(3C) simply return the error and return
values from the structure, no system calls are involved. While the I/O
is in progress an EINPROGRESS error is returned. I/O completion can be
detected by monitoring the error value returned by aio_error(3C).
The aiocbp→aio_lio_opcode field is ignored by aio_write().
Simultaneous asynchronous operations using the same aiocbp produce
undefined results.
If _POSIX_SYNCHRONIZED_IO is defined and synchronized I/O is enabled on
the file associated with aiocbp→aio_fildes, the behavior of this func‐
tion shall be according to the definitions of synchronized I/O data
integrity completion and synchronized I/O file integrity completion.
For any system action that changes the process memory space while an
asynchronous I/O is outstanding to the address range being changed, the
result of that action is undefined.
For regular files, no data transfer will occur past the offset maximum
established in the open file description associated with
aiocbp→aio_fildes.
RETURN VALUES
The aio_write() 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.
ERRORS
The aio_write() function will fail if:
EAGAIN The requested asynchronous I/O operation was not queued due
to system resource limitations.
Each of the following conditions may be detected synchronously at the
time of the call to aio_write(), or asynchronously. If any of the con‐
ditions below are detected synchronously, the aio_write() function
returns −1 and sets errno to the corresponding value. If any of the
conditions below are detected asynchronously, the return status of the
asynchronous operation is set to −1, and the error status of the asyn‐
chronous operation will be set to the corresponding value.
EBADF The aiocbp→aio_fildes argument is not a valid file descriptor
open for writing.
EINVAL The file offset value implied by aiocbp->aio_offset would be
invalid, aiocbp->aio_reqprio is not a valid value, or
aiocbp→aio_nbytes is an invalid value.
In the case that the aio_write() successfully queues the I/O operation,
the return status of the asynchronous operation will be one of the val‐
ues normally returned by the write(2) function call. If the operation
is successfully queued but is subsequently canceled or encounters an
error, the error status for the asynchronous operation contains one of
the values normally set by the write() function call, or one of the
following:
EBADF The aiocbp→aio_fildes argument is not a valid file
descriptor open for writing.
EINVAL The file offset value implied by aiocbp->aio_offset would
be invalid.
ECANCELED The requested I/O was canceled before the I/O completed
due to an explicit aio_cancel(3C) request.
The following condition may be detected synchronously or asyn‐
chronously:
EFBIG The file is a regular file, aiocbp→aio_nbytes is greater than
0 and the starting offset in aiocbp→aio_offset is at or beyond
the offset maximum in the open file description associated
with aiocbp→aio_fildes.
USAGE
The aio_write() function has a transitional interface for 64-bit file
offsets. See lf64(7).
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMT-Safe _ Stan‐
dardSee standards(7).
SEE ALSO
_Exit(2), close(2), fork(2), lseek(2), write(2), aio_cancel(3C),
aio_error(3C), aio_read(3C), aio_return(3C), lio_listio(3C),
aio.h(3HEAD), signal.h(3HEAD), attributes(7), lf64(7), standards(7)
Oracle Solaris 11.4 17 Aug 2018 aio_write(3C)