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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 "kern_util.h"
20#include "user.h"
21#include "ubd_user.h"
22#include "os.h"
23#include "cow.h"
24
25#include <endian.h>
26#include <byteswap.h>
27
28void ignore_sigwinch_sig(void)
29{
30 signal(SIGWINCH, SIG_IGN);
31}
32
33int start_io_thread(unsigned long sp, int *fd_out)
34{
35 int pid, fds[2], err;
36
37 err = os_pipe(fds, 1, 1);
38 if(err < 0){
39 printk("start_io_thread - os_pipe failed, err = %d\n", -err);
40 goto out;
41 }
42
43 kernel_fd = fds[0];
44 *fd_out = fds[1];
45
46 err = os_set_fd_block(*fd_out, 0);
47 if (err) {
48 printk("start_io_thread - failed to set nonblocking I/O.\n");
49 goto out_close;
50 }
51
52 pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL);
53 if(pid < 0){
54 err = -errno;
55 printk("start_io_thread - clone failed : errno = %d\n", errno);
56 goto out_close;
57 }
58
59 return(pid);
60
61 out_close:
62 os_close_file(fds[0]);
63 os_close_file(fds[1]);
64 kernel_fd = -1;
65 *fd_out = -1;
66 out:
67 return err;
68}
69
