linux/arch/um/drivers/ubd_user.c
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   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
  24void ignore_sigwinch_sig(void)
  25{
  26        signal(SIGWINCH, SIG_IGN);
  27}
  28
  29int 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}
  65
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