src/s/cygwin.h

   1 /* System description header file for Cygwin.
   2
   3 Copyright (C) 1985, 1986, 1992, 1999, 2002, 2003, 2004, 2005, 2006,
   4   2007, 2008, 2009, 2010  Free Software Foundation, Inc.
   5
   6 This file is part of GNU Emacs.
   7
   8 GNU Emacs is free software: you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation, either version 3 of the License, or
  11 (at your option) any later version.
  12
  13 GNU Emacs is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 /* SYSTEM_TYPE should indicate the kind of system you are using.
  22    It sets the Lisp variable system-type.  */
  23 #define SYSTEM_TYPE "cygwin"
  24
  25 /* Emacs can read input using SIGIO and buffering characters itself,
  26    or using CBREAK mode and making C-g cause SIGINT.
  27    The choice is controlled by the variable interrupt_input.
  28
  29    Define INTERRUPT_INPUT to make interrupt_input = 1 the default (use SIGIO)
  30
  31    Emacs uses the presence or absence of the SIGIO and BROKEN_SIGIO macros
  32    to indicate whether or not signal-driven I/O is possible.  It uses
  33    INTERRUPT_INPUT to decide whether to use it by default.
  34
  35    SIGIO can be used only on systems that implement it (4.2 and 4.3).
  36    CBREAK mode has two disadvantages
  37      1) At least in 4.2, it is impossible to handle the Meta key properly.
  38         I hear that in system V this problem does not exist.
  39      2) Control-G causes output to be discarded.
  40         I do not know whether this can be fixed in system V.
  41
  42    Another method of doing input is planned but not implemented.
  43    It would have Emacs fork off a separate process
  44    to read the input and send it to the true Emacs process
  45    through a pipe. */
  46 #undef INTERRUPT_INPUT
  47
  48 /* Define HAVE_TERMIOS if the system provides POSIX-style
  49    functions and macros for terminal control.
  50
  51    Define HAVE_TERMIO if the system provides sysV-style ioctls
  52    for terminal control.
  53
  54    Do not define both.  HAVE_TERMIOS is preferred, if it is
  55    supported on your system.  */
  56 #define HAVE_TERMIOS
  57
  58 /* Define HAVE_PTYS if the system supports pty devices.  */
  59 #define HAVE_PTYS
  60 #define PTY_ITERATION           for (i = 0; i < 1; i++) /* ick */
  61 #define PTY_NAME_SPRINTF        /* none */
  62 #define PTY_TTY_NAME_SPRINTF    /* none */
  63 #define PTY_OPEN                                        \
  64   do                                                    \
  65     {                                                   \
  66       int dummy;                                        \
  67       SIGMASKTYPE mask;                                 \
  68       mask = sigblock (sigmask (SIGCHLD));              \
  69       if (-1 == openpty (&fd, &dummy, pty_name, 0, 0))  \
  70         fd = -1;                                        \
  71       sigsetmask (mask);                                \
  72       emacs_close (dummy);                              \
  73     }                                                   \
  74   while (0)
  75
  76 /* Define CLASH_DETECTION if you want lock files to be written
  77    so that Emacs can tell instantly when you try to modify
  78    a file that someone else has modified in his Emacs.  */
  79 #define CLASH_DETECTION
  80
  81 /* If the system's imake configuration file defines `NeedWidePrototypes'
  82    as `NO', we must define NARROWPROTO manually.  Such a define is
  83    generated in the Makefile generated by `xmkmf'.  If we don't
  84    define NARROWPROTO, we will see the wrong function prototypes
  85    for X functions taking float or double parameters.  */
  86 #define NARROWPROTO 1
  87
  88 /* Used in various places to enable cygwin-specific code changes.  */
  89 #define CYGWIN 1
  90
  91 #define PENDING_OUTPUT_COUNT(FILE) ((FILE)->_p - (FILE)->_bf._base)
  92
  93 #define HAVE_SOCKETS
  94
  95 /* vfork() interacts badly with setsid(), causing ptys to fail to
  96    change their controlling terminal */
  97 #define vfork fork
  98
  99 /* This should work (at least when compiling with gcc).  But I have no way
 100    or intention to verify or even test it.  If you encounter a problem with
 101    it, feel free to change this setting, but please add a comment here about
 102    why it needed to be changed.  */
 103 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
 104
 105 /* Virtual addresses of pure and impure space can vary, as on Windows.  */
 106 #define VIRT_ADDR_VARIES
 107
 108 /* Emacs supplies its own malloc, but glib (part of Gtk+) calls
 109    memalign and on Cygwin, that becomes the Cygwin-supplied memalign.
 110    As malloc is not the Cygwin malloc, the Cygwin memalign always
 111    returns ENOSYS.  A workaround is to set G_SLICE=always-malloc. */
 112 #define G_SLICE_ALWAYS_MALLOC
 113
 114 /* arch-tag: 5ae7ba00-83b0-4ab3-806a-3e845779191b
 115    (do not change this comment) */