arch/um/os-Linux/tty.c

   1 /*
   2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <stdlib.h>
   7 #include <errno.h>
   8 #include "os.h"
   9 #include "user.h"
  10 #include "kern_util.h"
  11
  12 struct grantpt_info {
  13         int fd;
  14         int res;
  15         int err;
  16 };
  17
  18 static void grantpt_cb(void *arg)
  19 {
  20         struct grantpt_info *info = arg;
  21
  22         info->res = grantpt(info->fd);
  23         info->err = errno;
  24 }
  25
  26 int get_pty(void)
  27 {
  28         struct grantpt_info info;
  29         int fd;
  30
  31         fd = os_open_file("/dev/ptmx", of_rdwr(OPENFLAGS()), 0);
  32         if(fd < 0){
  33                 printk("get_pty : Couldn't open /dev/ptmx - err = %d\n", -fd);
  34                 return(fd);
  35         }
  36
  37         info.fd = fd;
  38         initial_thread_cb(grantpt_cb, &info);
  39
  40         if(info.res < 0){
  41                 printk("get_pty : Couldn't grant pty - errno = %d\n",
  42                        -info.err);
  43                 return(-1);
  44         }
  45         if(unlockpt(fd) < 0){
  46                 printk("get_pty : Couldn't unlock pty - errno = %d\n", errno);
  47                 return(-1);
  48         }
  49         return(fd);
  50 }
  51
  52 /*
  53  * Overrides for Emacs so that we follow Linus's tabbing style.
  54  * Emacs will notice this stuff at the end of the file and automatically
  55  * adjust the settings for this buffer only.  This must remain at the end
  56  * of the file.
  57  * ---------------------------------------------------------------------------
  58  * Local variables:
  59  * c-file-style: "linux"
  60  * End:
  61  */