man3/aio_cancel.3

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  23 .TH AIO_CANCEL 3 2003-11-14  "" "Linux Programmer's Manual"
  24 .SH NAME
  25 aio_cancel \- cancel an outstanding asynchronous I/O request
  26 .SH SYNOPSIS
  27 .sp
  28 .B "#include <aio.h>"
  29 .sp
  30 .BI "int aio_cancel(int " fd ", struct aiocb *" aiocbp );
  31 .SH DESCRIPTION
  32 The
  33 .BR aio_cancel ()
  34 function attempts to cancel outstanding asynchronous I/O requests
  35 for the file descriptor
  36 .IR fd .
  37 If
  38 .I aiocbp
  39 is NULL, all such requests are canceled.
  40 Otherwise, only the request
  41 described by the control block pointed to by
  42 .I aiocbp
  43 is canceled.
  44 .LP
  45 Normal asynchronous notification occurs for canceled requests.
  46 The request return status is set to \-1, and the request error status
  47 is set to ECANCELED.
  48 The control block of requests that cannot be canceled is not changed.
  49 .LP
  50 If
  51 .I aiocbp
  52 is not NULL, and
  53 .I fd
  54 differs from the file descriptor with which the asynchronous operation
  55 was initiated, unspecified results occur.
  56 .LP
  57 Which operations are cancellable is implementation-defined.
  58 .\" FreeBSD: not those on raw disk devices.
  59 .SH "RETURN VALUE"
  60 This function returns AIO_CANCELED if all requests were successfully
  61 canceled.
  62 It returns
  63 .B AIO_NOTCANCELED
  64 when at least one of the
  65 requests specified was not canceled because it was in progress.
  66 In this case one may check the status of individual requests using
  67 .BR aio_error (3).
  68 This function returns AIO_ALLDONE when all requests had
  69 been completed already before this call.
  70 When some error occurs, \-1 is returned, and
  71 .I errno
  72 is set appropriately.
  73 .SH ERRORS
  74 .TP
  75 .B EBADF
  76 .I fd
  77 is not a valid file descriptor.
  78 .SH "CONFORMING TO"
  79 POSIX.1-2001
  80 .SH "SEE ALSO"
  81 .BR aio_error (3),
  82 .BR aio_fsync (3),
  83 .BR aio_read (3),
  84 .BR aio_return (3),
  85 .BR aio_suspend (3),
  86 .BR aio_write (3)