On 07/12/10 02:53 +0100, ext Mitani wrote:
> Hi,
>
>
> "aio_read/8-1" and "aio_write/6-1" tests failed in my environments
> (RHEL5.5-x86, RHEL4.8-x86_64/ia64):
> ------------<RHEL5.5 - x86>
> conformance/interfaces/aio_read/8-1: execution: FAILED: Output:
> aio_read/8-1.c aio_read() should fail!
> [...]
> conformance/interfaces/aio_write/6-1: execution: FAILED: Output:
> aio_write/6-1.c aio_write should fail!
> ------------
>
>
> I tried "aio_read/8-1" manually:
> ------------
> [r...@rhel55-ltp-x86 aio_read]# ./8-1.run-test
> aio_return: 0
> aio_read(errno): 0
> aio_read(strerror): Success
> aio_read/8-1.c aio_read() should fail!
> ------------
>
> This test expects that "aio_read()" with "aio_buf = NULL" fails:
> ------------<aio_read/8-1.c>
> * - fill in an aiocb with a NULL aio_buf
> * - call aio_read
> * - check aio_read return value
> */
> [...]
> int main()
> {
> struct aiocb aiocb;
>
> if (sysconf(_SC_ASYNCHRONOUS_IO) != 200112L)
> return PTS_UNSUPPORTED;
>
> /* submit a request with a NULL buffer */
> aiocb.aio_fildes = 0;
> aiocb.aio_buf = NULL;
> aiocb.aio_nbytes = 0;
> aiocb.aio_offset = 0;
>
> if (aio_read(&aiocb) != -1)
> {
> printf(TNAME " aio_read() should fail!\n");
> exit(PTS_FAIL);
> }
> ------------
>
> But "aio_read()" succeeded.
>
>
> The manual says:
> ------------
> [r...@rhel55-ltp-x86 aio_read]# man aio_read
> AIO_READ(3) Linux Programmer's Manual
> AIO_READ(3)
>
> NAME
> aio_read - asynchronous read
>
> SYNOPSIS
> #include <aio.h>
>
> int aio_read(struct aiocb *aiocbp);
>
> [...]
> RETURN VALUE
> On success, 0 is returned. On error the request is not enqueued,
> -1 is
> returned, and errno is set appropriately. If an error is first
> detected
> later, it will be reported via aio_return(3) (returns status -1)
> and
> aio_error(3) (error status whatever one would have gotten in errno,
> such
> as EBADF).
>
> ERRORS
> EAGAIN Out of resources.
>
> EBADF aio_fildes is not a valid file descriptor open for reading.
>
> EINVAL One or more of aio_offset, aio_reqprio, aio_nbytes are
> invalid.
>
> ENOSYS This function is not supported.
>
> EOVERFLOW
> The file is a regular file, we start reading before
> end-of-file and
> want at least one byte, but the starting position is past the
> maxi-
> mum offset for this file.
>
> NOTES
> It is a good idea to zero out the control block before use. This
> control
> block must not be changed while the read operation is in progress.
> The
> buffer area being read into must not be accessed during the
> operation or
> undefined results may occur. The memory areas involved must remain
> valid.
> ------------
>
> Manual says that "aio_read()" fails when aio_offset, aio_reqprio,
> aio_nbytes, aio_fildes are invalid.
> But the manual doesn't say about "aio_buf".
>
> "aio_write/6-1"is same situation as "aio_read/8-1".
>
> What meaning do these tests have?
> Does "aio_read()" fail in the systems except Linux?
> If so, may I judge the possibility of this tests by judging
> the environment is Linux or not?
>
>
> Please give me some opinion.
>
>
> Regards--
>
> -Tomonori Mitani
>
Hi,
aio_read and aio_write are implemented in glibc, in
sysdeps/pthread/aio_read.c:
#include <aio.h>
#include <aio_misc.h>
int
aio_read (aiocbp)
struct aiocb *aiocbp;
{
return (__aio_enqueue_request ((aiocb_union *) aiocbp, LIO_READ) == NULL
? -1 : 0);
}
...
and the specific function dealing with aio_read and aio_write
__aio_enqueue_request() in sysdeps/pthread/aio_misc.c.
http://www.kernel.org/doc/man-pages/online/pages/man7/aio.7.html :
VERSIONS top
The POSIX AIO interfaces are provided by glibc since version 2.1.
Noticed the same aio_read/aio_write behavior in ARMv7 devices, depending on
glibc version of course.
br,
Hannu
--
Hannu Heikkinen
http://www.nixu.com
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