io_cancel - cancel an outstanding asynchronous I/O operation
#include <linux/aio_abi.h> /* Defines needed types */
int io_cancel(aio_context_t ctx_id, struct iocb *iocb,
struct io_event *result);
Note: There is no glibc wrapper for this system call; see
Note: this page describes the raw Linux system call
interface. The wrapper function provided by
libaio uses a
different type for the
ctx_id argument. See NOTES.
The io_cancel() system call attempts to cancel an
asynchronous I/O operation previously submitted with
iocb argument describes the
operation to be canceled and the
ctx_id argument is the AIO
context to which the operation was submitted. If the operation is
successfully canceled, the event will be copied into the memory pointed
result without being placed into the completion
On success, io_cancel() returns 0. For the failure return, see NOTES.
iocb specified was not canceled.
One of the data structures points to invalid data.
The AIO context specified by
ctx_id is invalid.
io_cancel() is not implemented on this architecture.
The asynchronous I/O system calls first appeared in Linux 2.5.
Note that the
libaio wrapper function uses a different type
io_context_t) for the
ctx_id argument. Note also that
libaio wrapper does not follow the usual C library
conventions for indicating errors: on error it returns a negated error
number (the negative of one of the values listed in ERRORS). If the
system call is invoked via syscall(2), then the return
value follows the usual conventions for indicating an error: -1, with
errno set to a (positive) value that indicates the error.
This page is part of release 5.10 of the Linux
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