nbd_aio_command_completed - check if the command completed
#include <libnbd.h>
int nbd_aio_command_completed (
struct nbd_handle *h, uint64_t cookie
);Return true if the command completed. If this function returns true then the command was successful and it has been retired. Return false if the command is still in flight. This can also fail with an error in case the command failed (in this case the command is also retired). A command is retired either via this command, or by using a completion callback which returns 1.
The cookie parameter is the positive unique 64 bit cookie for the command, as returned by a call such as nbd_aio_pread(3).
This call returns a boolean value.
On error -1 is returned.
Refer to "ERROR HANDLING" in libnbd(3) for how to get further details of the error.
The following parameters must not be NULL: h. For more information see "Non-NULL parameters" in libnbd(3).
This function first appeared in libnbd 1.0.
If you need to test if this function is available at compile time check if the following macro is defined:
#define LIBNBD_HAVE_NBD_AIO_COMMAND_COMPLETED 1nbd_aio_pread(3), nbd_create(3), libnbd(3).
Eric Blake
Richard W.M. Jones
Copyright Red Hat
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