arch/um/drivers/ubd_user.c

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