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aio_cancel(3c)
Standard C Library Functions aio_cancel(3C)
NAME
aio_cancel - cancel asynchronous I/O request
SYNOPSIS
#include <aio.h>
int aio_cancel(int fildes, struct aiocb *aiocbp);
DESCRIPTION
The aio_cancel() function attempts 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 par‐
ticular request to be canceled. If aiocbp is NULL, then all outstanding
cancelable asynchronous I/O requests against fildes are canceled.
Normal asynchronous notification occurs for asynchronous I/O operations
that are successfully canceled. If there are requests that cannot be
canceled, then the normal asynchronous completion process takes place
for those requests when they are completed.
For requested operations that are successfully canceled, the associated
error status is set to ECANCELED and the return status is −1. For
requested operations that are not successfully canceled, the aiocbp is
not 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.
RETURN VALUES
The aio_cancel() function returns the value AIO_CANCELED to the calling
process if the requested operation(s) were canceled. The value AIO_NOT‐
CANCELED is returned if at least one of the requested operation(s) can‐
not 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(3C). The value AIO_ALLDONE is returned if all of the opera‐
tions have already completed. Otherwise, the function returns −1 and
sets errno to indicate the error.
ERRORS
The aio_cancel() function will fail if:
EBADF The fildes argument is not a valid file descriptor.
ENOSYS The aio_cancel() function is not supported.
USAGE
The aio_cancel() 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
aio_read(3C), aio_return(3C), aio.h(3HEAD), signal.h(3HEAD),
attributes(7), lf64(7), standards(7)
Oracle Solaris 11.4 31 Jan 2012 aio_cancel(3C)