From owner-freebsd-current  Thu Nov 12 10:57:05 1998
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Date: Thu, 12 Nov 1998 13:56:41 -0500 (EST)
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From: HighWind Software Information <info@highwind.com>
To: current@FreeBSD.ORG
Subject: aio_write() doesn't work!
Sender: owner-freebsd-current@FreeBSD.ORG
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X-Loop: FreeBSD.ORG


Is is me or does "aio_write()" under FreeBSD 3.0 simply NOT work?

This prints all x's. Considering I used aio_write() to write a 'y' in
there, why doesn't it work??

-Rob

---


/*****************************************************************************
File:     aioTest.c
Contents: Simple Test of the aio_write() function

gcc -o aioTest aioTest.c -Wall -Werror

*****************************************************************************/

#include <assert.h>
#include <fcntl.h>
#include <memory.h>
#include <time.h>
#include <sys/aio.h>
#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;
}


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