HP-UX Reference (11i v1 00/12) - 2 System Calls (vol 5)

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aio_write(2) aio_write(2)

[EBADF] The aiocbp->aio_fildes was not a valid ﬁle descriptor open for writing.

[EINVAL] The aiocb->aio_sigevent is not a valid address in the process virtual address

space.

[EINVAL] The parameters of the indicated sigevent in aiocb->aio_sigevent are

invalid.

[EINVAL] The value of aiocbp->aio_reqprio is not valid.

[EINVAL] The value of aiocbp->aio_nbytes is invalid.

[EINVAL] The ﬁle offset implied by aiocbp->aio_offset or aiocbp->aio_offset+

aiocbp->aio_nbytes are not valid for the ﬁle at the time the request is pro-

cessed.

[ECANCELED]

The write operation was canceled due to a subsequent call to aio_cancel()

referencing the same aiocb that was used to start the operation.

EXAMPLE

The following code sequence and call to aio_write()

starts an asynchronous write operation.

#include <fcntl.h>

#include <errno.h>

#include <aio.h>

char buf[4096];

int retval; ssize_t nbytes;

struct aiocb myaiocb;

bzero( &myaiocb, sizeof (struct aiocb));

bzero( &buf, sizeof (buf));

myaiocb.aio_fildes = open( "/dev/null", O_RDWR);

myaiocb.aio_offset = 0;

myaiocb.aio_buf = (void *) buf;

myaiocb.aio_nbytes = sizeof (buf);

myaiocb.aio_sigevent.sigev_notify = SIGEV_NONE;

retval = aio_write( &myaiocb );

if (retval) perror("aio_write:");

/* continue processing */

...

/* wait for completion */

while ( (retval = aio_error( &myaiocb) ) == EINPROGRESS) ;

/* free the aiocb */

nbytes = aio_return( &myaiocb);