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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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io_cancel(2) System Calls Manual io_cancel(2)
io_cancel - cancel an outstanding asynchronous I/O operation
Standard C library (libc, -lc)
Alternatively, Asynchronous I/O library (libaio, -laio); see
VERSIONS.
#include <linux/aio_abi.h> /* Definition of needed types */
#include <sys/syscall.h> /* Definition of SYS_* constants */
#include <unistd.h>
int syscall(SYS_io_cancel, aio_context_t ctx_id, struct iocb *iocb,
struct io_event *result);
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 VERSIONS.
The io_cancel() system call attempts to cancel an asynchronous
I/O operation previously submitted with io_submit(2). The 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 to by result without being placed
into the completion queue.
On success, io_cancel() returns 0. For the failure return, see
VERSIONS.
EAGAIN The iocb specified was not canceled.
EFAULT One of the data structures points to invalid data.
EINVAL The AIO context specified by ctx_id is invalid.
ENOSYS io_cancel() is not implemented on this architecture.
You probably want to use the io_cancel() wrapper function
provided by libaio.
Note that the libaio wrapper function uses a different type
(io_context_t) for the ctx_id argument. Note also that the
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.
Linux.
Linux 2.5.
io_destroy(2), io_getevents(2), io_setup(2), io_submit(2), aio(7)
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Linux man-pages 6.9.1 2024-05-02 io_cancel(2)
Pages that refer to this page: io_destroy(2), io_getevents(2), io_setup(2), io_submit(2), syscalls(2), aio(7)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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