NAME
iocancel - cancel an outstanding asynchronous I/O operation SYNOPSIS
#include
/* Defines needed types */ int iocancel(aiocontextt ctxid, struct iocb *iocb, struct ioevent *result); Note: There is no glibc wrapper for this system call; see NOTES. DESCRIPTION The iocancel() system call attempts to cancel an asynchronous I/O operation previously submitted with iosubmit(2). The iocb argument describes the operation to be canceled and the ctxid 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. RETURN VALUE On success, iocancel() returns 0. For the failure return, see NOTES. ERRORS EAGAIN The iocb specified was not canceled. EFAULT One of the data structures points to invalid data. EINVAL The AIO context specified by ctxid is invalid. ENOSYS iocancel() is not implemented on this architecture. VERSIONS The asynchronous I/O system calls first appeared in Linux 2.5. CONFORMING TO iocancel() is Linux-specific and should not be used in programs that are intended to be portable. NOTES Glibc does not provide a wrapper function for this system call. You could invoke it using syscall(2). But instead, you probably want to use the iocancel() wrapper function provided by libaio. Note that the libaio wrapper function uses a different type (ioconā textt) for the ctxid 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. SEE ALSO iodestroy(2), iogetevents(2), iosetup(2), iosubmit(2), aio(7) COLOPHON
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Linux 2013-04-10 IOCANCEL(2)