1 /*
2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Copyright (C) 2001 Ridgerun,Inc (glonnon@ridgerun.com)
4 * Licensed under the GPL
5 */
6
7 #include <stddef.h>
8 #include <unistd.h>
9 #include <errno.h>
10 #include <sched.h>
11 #include <signal.h>
12 #include <string.h>
13 #include <netinet/in.h>
14 #include <sys/time.h>
15 #include <sys/socket.h>
16 #include <sys/mman.h>
17 #include <sys/param.h>
18 #include <endian.h>
19 #include <byteswap.h>
20
21 #include "ubd.h"
22 #include <os.h>
23
start_io_thread(unsigned long sp,int * fd_out)24 int start_io_thread(unsigned long sp, int *fd_out)
25 {
26 int pid, fds[2], err;
27
28 err = os_pipe(fds, 1, 1);
29 if(err < 0){
30 printk("start_io_thread - os_pipe failed, err = %d\n", -err);
31 goto out;
32 }
33
34 kernel_fd = fds[0];
35 *fd_out = fds[1];
36
37 err = os_set_fd_block(*fd_out, 0);
38 if (err) {
39 printk("start_io_thread - failed to set nonblocking I/O.\n");
40 goto out_close;
41 }
42
43 pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL);
44 if(pid < 0){
45 err = -errno;
46 printk("start_io_thread - clone failed : errno = %d\n", errno);
47 goto out_close;
48 }
49
50 return(pid);
51
52 out_close:
53 os_close_file(fds[0]);
54 os_close_file(fds[1]);
55 kernel_fd = -1;
56 *fd_out = -1;
57 out:
58 return err;
59 }
60