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