One step closer to group reporting
[fio.git] / engines / null.c
CommitLineData
a94ea28b
JA
1/*
2 * null engine - doesn't do any transfers. Used to test fio.
3 *
4 */
5#include <stdio.h>
6#include <stdlib.h>
7#include <unistd.h>
8#include <errno.h>
9#include <assert.h>
10
11#include "../fio.h"
12#include "../os.h"
13
36167d82 14static int fio_null_queue(struct thread_data fio_unused *td, struct io_u *io_u)
a94ea28b 15{
a94ea28b
JA
16 io_u->resid = 0;
17 io_u->error = 0;
36167d82 18 return FIO_Q_COMPLETED;
a94ea28b
JA
19}
20
2fd233b7
JA
21static int fio_null_setup(struct thread_data *td)
22{
23 struct fio_file *f;
24 int i;
25
26 if (!td->total_file_size) {
27 log_err("fio: need size= set\n");
28 return 1;
29 }
30
31 td->io_size = td->total_file_size;
32 td->total_io_size = td->io_size;
33
34 for_each_file(td, f, i) {
35 f->fd = dup(STDOUT_FILENO);
36 f->real_file_size = td->total_io_size / td->nr_files;
37 f->file_size = f->real_file_size;
38 }
39
40 td->nr_open_files = td->nr_files;
41 return 0;
42}
43
a94ea28b
JA
44static struct ioengine_ops ioengine = {
45 .name = "null",
46 .version = FIO_IOOPS_VERSION,
2fd233b7 47 .setup = fio_null_setup,
a94ea28b 48 .queue = fio_null_queue,
2fd233b7 49 .flags = FIO_SYNCIO | FIO_DISKLESSIO | FIO_SELFOPEN,
a94ea28b
JA
50};
51
52static void fio_init fio_null_register(void)
53{
54 register_ioengine(&ioengine);
55}
56
57static void fio_exit fio_null_unregister(void)
58{
59 unregister_ioengine(&ioengine);
60}