include/linux/devpts_fs.h

   1 /* -*- linux-c -*- --------------------------------------------------------- *
   2  *
   3  * linux/include/linux/devpts_fs.h
   4  *
   5  *  Copyright 1998 H. Peter Anvin -- All Rights Reserved
   6  *
   7  * This file is part of the Linux kernel and is made available under
   8  * the terms of the GNU General Public License, version 2, or at your
   9  * option, any later version, incorporated herein by reference.
  10  *
  11  * ------------------------------------------------------------------------- */
  12
  13 /*
  14  * Prototypes for the pty driver <-> devpts filesystem interface.  Most
  15  * of this is really just a hack so we can exclude it or build it as a
  16  * module, and probably should go away eventually.
  17  */
  18
  19 #ifndef _LINUX_DEVPTS_FS_H
  20 #define _LINUX_DEVPTS_FS_H 1
  21
  22 #include <linux/config.h>
  23 #include <linux/kdev_t.h>
  24 #include <linux/tty.h>
  25
  26 #ifdef CONFIG_DEVPTS_FS
  27
  28 void devpts_pty_new(int, kdev_t);
  29 void devpts_pty_kill(int);
  30 #define unix98_max_ptys               NR_PTYS * UNIX98_NR_MAJORS;
  31
  32 #elif defined(CONFIG_DEVPTS_FS_MODULE)
  33
  34 #ifdef BUILDING_PTY_C
  35 void (*devpts_upcall_new)(int,kdev_t) = NULL;
  36 void (*devpts_upcall_kill)(int)       = NULL;
  37 unsigned int unix98_max_ptys          = NR_PTYS * UNIX98_NR_MAJORS;
  38
  39 EXPORT_SYMBOL(devpts_upcall_new);
  40 EXPORT_SYMBOL(devpts_upcall_kill);
  41 EXPORT_SYMBOL(unix98_max_ptys);
  42 #else
  43 extern void (*devpts_upcall_new)(int,kdev_t);
  44 extern void (*devpts_upcall_kill)(int);
  45 extern unsigned int unix98_max_ptys;
  46 #endif
  47
  48 #ifndef BUILDING_DEVPTS
  49 static inline void
  50 devpts_pty_new(int line, kdev_t device)
  51 {
  52         if ( devpts_upcall_new )
  53                 return devpts_upcall_new(line,device);
  54 }
  55
  56 static inline void
  57 devpts_pty_kill(int line)
  58 {
  59         if ( devpts_upcall_kill )
  60                 return devpts_upcall_kill(line);
  61 }
  62 #endif
  63
  64 #else  /* No /dev/pts filesystem at all */
  65
  66 static inline void
  67 devpts_pty_new(int line, kdev_t device) { }
  68
  69 static inline void
  70 devpts_pty_kill(int line) { }
  71
  72 #endif
  73
  74 #endif /* _LINUX_DEVPTS_FS_H */