LXR linux/arch/um/drivers/ubd

   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
  24int 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