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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 "asm/types.h"
19#include "ubd_user.h"
20#include "os.h"
21#include "cow.h"
22
23#include <endian.h>
24#include <byteswap.h>
25
26void ignore_sigwinch_sig(void)
27{
28 signal(SIGWINCH, SIG_IGN);
29}
30
31int start_io_thread(unsigned long sp, int *fd_out)
32{
33 int pid, fds[2], err;
34
35 err = os_pipe(fds, 1, 1);
36 if(err < 0){
37 printk("start_io_thread - os_pipe failed, err = %d\n", -err);
38 goto out;
39 }
40
41 kernel_fd = fds[0];
42 *fd_out = fds[1];
43
44 err = os_set_fd_block(*fd_out, 0);
45 if (err) {
46 printk("start_io_thread - failed to set nonblocking I/O.\n");
47 goto out_close;
48 }
49
50 pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL);
51 if(pid < 0){
52 err = -errno;
53 printk("start_io_thread - clone failed : errno = %d\n", errno);
54 goto out_close;
55 }
56
57 return(pid);
58
59 out_close:
60 os_close_file(fds[0]);
61 os_close_file(fds[1]);
62 kernel_fd = -1;
63 *fd_out = -1;
64 out:
65 return err;
66}
67
