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 "asm/types.h"
  19 #include "user_util.h"
  20 #include "kern_util.h"
  21 #include "user.h"
  22 #include "ubd_user.h"
  23 #include "os.h"
  24 #include "cow.h"
  25
  26 #include <endian.h>
  27 #include <byteswap.h>
  28
  29 void ignore_sigwinch_sig(void)
  30 {
  31         signal(SIGWINCH, SIG_IGN);
  32 }
  33
  34 int start_io_thread(unsigned long sp, int *fd_out)
  35 {
  36         int pid, fds[2], err;
  37
  38         err = os_pipe(fds, 1, 1);
  39         if(err < 0){
  40                 printk("start_io_thread - os_pipe failed, err = %d\n", -err);
  41                 goto out;
  42         }
  43
  44         kernel_fd = fds[0];
  45         *fd_out = fds[1];
  46
  47         pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM | SIGCHLD,
  48                     NULL);
  49         if(pid < 0){
  50                 printk("start_io_thread - clone failed : errno = %d\n", errno);
  51                 err = -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
  66 /*
  67  * Overrides for Emacs so that we follow Linus's tabbing style.
  68  * Emacs will notice this stuff at the end of the file and automatically
  69  * adjust the settings for this buffer only.  This must remain at the end
  70  * of the file.
  71  * ---------------------------------------------------------------------------
  72  * Local variables:
  73  * c-file-style: "linux"
  74  * End:
  75  */