Date: Thu, 12 Nov 1998 12:03:59 -0800 (PST) From: info@highwind.com To: freebsd-gnats-submit@FreeBSD.ORG Subject: kern/8669: aio_write() and aio_read() do not work AT ALL. Message-ID: <199811122003.MAA14968@hub.freebsd.org>
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>Number: 8669
>Category: kern
>Synopsis: aio_write() and aio_read() do not work AT ALL.
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Nov 12 12:10:00 PST 1998
>Last-Modified:
>Originator: Robert Fleischman
>Organization:
HighWind Software
>Release: 3.0
>Environment:
FreeBSD zonda.highwind.com 3.0-19980831-SNAP FreeBSD 3.0-19980831-SNAP #0: Mon Aug 31 14:03:19 GMT 1998 root@make.ican.net:/usr/src/sys/compile/GENERIC i386
Also, we have a VERY recent libc_r
>Description:
It appears that aio_read() and aio_write() do not work.
Besides not having a man page, they don't pay any attention to the
offset parameter. This makes it impossible to use them.
>How-To-Repeat:
/*****************************************************************************
File: aioTest.c
Contents: Simple Test of the aio_write() function
Created: 12-Nov-1998
gcc -o aioTest aioTest.c -Wall -Werror
*****************************************************************************/
#include <assert.h>
#include <fcntl.h>
#include <memory.h>
#include <time.h>
#ifdef solaris
#include <aio.h>
#else
#include <sys/aio.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main(int argc, char **argv)
{
int fd;
char before[10], after[11], y;
struct aiocb token;
const struct aiocb *tlist;
/* Open the test file */
fd = open("test", O_RDWR | O_CREAT | O_TRUNC, 0666);
assert(fd != -1);
/* Write 10 x's */
memset(before, 'x', 10);
assert(write(fd, &before, 10) == 10);
/* Use aio_write() to write a 'y' at offset 5 */
y = 'Y';
memset(&token, 0, sizeof(struct aiocb));
token.aio_fildes = fd;
token.aio_offset = 5;
token.aio_buf = &y;
token.aio_nbytes = 1;
token.aio_sigevent.sigev_notify = SIGEV_NONE;
/* Enqueue the write */
assert(aio_write(&token) == 0);
/* Wait for completion */
tlist = &token;
assert(aio_suspend(&tlist, 1, 0) == 0);
/* Ensure the write worked! */
assert(aio_return(&token) == 1);
/* Read back the whole file */
memset(after, 0, 11);
assert(lseek(fd, 0, SEEK_SET) == 0);
assert(read(fd, &after, 10) == 10);
printf("%s\n", after);
return EXIT_SUCCESS;
}
>Fix:
No idea. However, this test program above SHOULD print a "Y" in that
printout. It appears that the program simply appends a "Y" instead
of writing it in the correct place.
Without aio_read() and aio_write() doing threaded offset reads and write
is impossible (We don't have pwrite/pread yet!)
>Audit-Trail:
>Unformatted:
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