winsup/cygwin/local_includes/dtable.h

   1 /* dtable.h: fd table definition.
   2
   3 This file is part of Cygwin.
   4
   5 This software is a copyrighted work licensed under the terms of the
   6 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
   7 details. */
   8
   9 #pragma once
  10
  11 /* Initial and increment values for cygwin's fd table */
  12 #define NOFILE_INCR    32
  13
  14 #include "thread.h"
  15 #include "sync.h"
  16
  17 class suffix_info;
  18
  19 #define BFH_OPTS (PC_NULLEMPTY | PC_FULL | PC_POSIX)
  20 class dtable
  21 {
  22   fhandler_base **fds;
  23   fhandler_base **archetypes;
  24   unsigned narchetypes;
  25   unsigned farchetype;
  26   static const int initial_archetype_size = 8;
  27   size_t first_fd_for_open;
  28   int cnt_need_fixup_before;
  29 public:
  30   size_t size;
  31
  32   dtable () : archetypes (NULL), narchetypes (0), farchetype (0), first_fd_for_open(3), cnt_need_fixup_before(0) {}
  33   void init () {first_fd_for_open = 3;}
  34
  35   void dec_need_fixup_before ()
  36     { if (cnt_need_fixup_before > 0) --cnt_need_fixup_before; }
  37   void inc_need_fixup_before ()
  38     { cnt_need_fixup_before++; }
  39   bool need_fixup_before ()
  40     { return cnt_need_fixup_before > 0; }
  41
  42   void move_fd (int, int);
  43   int vfork_child_dup ();
  44   void vfork_parent_restore ();
  45   void vfork_child_fixup ();
  46   fhandler_base *dup_worker (fhandler_base *oldfh, int flags);
  47   int extend (size_t, size_t);
  48   void fixup_after_fork (HANDLE);
  49   void fixup_close (size_t, fhandler_base *);
  50
  51   inline int not_open (int fd)
  52   {
  53     lock ();
  54     int res = fd < 0 || fd >= (int) size || fds[fd] == NULL;
  55     unlock ();
  56     return res;
  57   }
  58   int find_unused_handle (size_t start);
  59   int find_unused_handle () { return find_unused_handle (first_fd_for_open);}
  60   void release (int fd);
  61   void init_std_file_from_handle (int fd, HANDLE handle);
  62   int dup3 (int oldfd, int newfd, int flags);
  63   void fixup_after_exec ();
  64   inline fhandler_base *&operator [](int fd) const { return fds[fd]; }
  65   bool select_read (int fd, select_stuff *);
  66   bool select_write (int fd, select_stuff *);
  67   bool select_except (int fd, select_stuff *);
  68   operator fhandler_base **() {return fds;}
  69   void stdio_init ();
  70   void get_debugger_info ();
  71   void set_file_pointers_for_exec ();
  72   fhandler_base *find_archetype (device& dev);
  73   fhandler_base **add_archetype ();
  74   void delete_archetype (fhandler_base *);
  75   void fixup_before_exec (DWORD win_proc_id);
  76   void fixup_before_fork (DWORD win_proc_id);
  77   void lock () {lock_process::locker.acquire ();}
  78   void unlock () {lock_process::locker.release ();}
  79 };
  80
  81 fhandler_base *build_fh_dev (const device&, const char * = NULL);
  82 fhandler_base *build_fh_name (const char *, unsigned = 0, suffix_info * = NULL);
  83 fhandler_base *build_fh_pc (path_conv& pc);
  84
  85 void dtable_init ();
  86 void stdio_init ();
  87 extern dtable fdtab;
  88
  89 extern "C" int getfdtabsize ();
  90 extern "C" void setfdtabsize (int);