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io_cancel() - Unix, Linux System Call
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NAME
io_cancel - Cancel an outstanding asynchronous I/O operation
SYNOPSIS
#include <libaio.h>
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long io_cancel (aio_context_t ctx_id, struct iocb *iocb, struct io_event *result);
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DESCRIPTION
io_cancel() attempts to cancel an asynchronous I/O operation
previously submitted with the io_submit system call.
ctx_id is the AIO context ID of the operation to be cancelled.
If the AIO context is found, the event will be cancelled and then copied
into the memory pointed to by result without being placed
into the completion queue.
RETURN VALUE
io_cancel() returns 0 on success; otherwise, it returns one of the
errors listed in the "Errors" section.
ERRORS
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EINVAL
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The AIO context specified by ctx_id is invalid.
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EFAULT
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One of the data structures points to invalid data.
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EAGAIN
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The iocb specified was not cancelled.
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ENOSYS
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io_cancel() is not implemented on this architecture.
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VERSIONS
The asynchronous I/O system calls first appeared in Linux 2.5, August 2002.
CONFORMING TO
io_cancel() is Linux specific and should not be used in programs that are intended to be portable.
SEE ALSO
io_setup(2), io_destroy(2), io_getevents(2), io_submit(2).
NOTES
The asynchronous I/O system calls were written by Benjamin LaHaise.
AUTHOR
Kent Yoder.
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