src/s/darwin.h

   1 /* System description header file for Darwin (Mac OS X).
   2
   3 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
   4   2010, 2011  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
  22 /* Define symbols to identify the version of Unix this is.
  23    Define all the symbols that apply correctly.  */
  24 #define BSD4_2
  25 /* BSD4_3 and BSD4_4 are already defined in sys/param.h */
  26 #define BSD_SYSTEM
  27
  28 /* More specific than the above two.  We cannot use __APPLE__ as this
  29    may not be defined on non-OSX Darwin, and we cannot define DARWIN
  30    here because Panther and lower CoreFoundation.h uses DARWIN to
  31    distinguish OS X from pure Darwin.  */
  32 #define DARWIN_OS
  33
  34
  35 /* SYSTEM_TYPE should indicate the kind of system you are using.
  36    It sets the Lisp variable system-type.  */
  37 #define SYSTEM_TYPE "darwin"
  38
  39 /* Emacs can read input using SIGIO and buffering characters itself,
  40    or using CBREAK mode and making C-g cause SIGINT.
  41    The choice is controlled by the variable interrupt_input.
  42
  43    Define INTERRUPT_INPUT to make interrupt_input = 1 the default (use SIGIO)
  44
  45    Emacs uses the presence or absence of the SIGIO and BROKEN_SIGIO macros
  46    to indicate whether or not signal-driven I/O is possible.  It uses
  47    INTERRUPT_INPUT to decide whether to use it by default.
  48
  49    SIGIO can be used only on systems that implement it (4.2 and 4.3).
  50    CBREAK mode has two disadvantages
  51      1) At least in 4.2, it is impossible to handle the Meta key properly.
  52         I hear that in system V this problem does not exist.
  53      2) Control-G causes output to be discarded.
  54         I do not know whether this can be fixed in system V.
  55
  56    Another method of doing input is planned but not implemented.
  57    It would have Emacs fork off a separate process
  58    to read the input and send it to the true Emacs process
  59    through a pipe. */
  60 #define INTERRUPT_INPUT
  61
  62 /* Letter to use in finding device name of first pty,
  63   if system supports pty's.  'a' means it is /dev/ptya0  */
  64 #define FIRST_PTY_LETTER 'p'
  65
  66 #define NO_TERMIO
  67
  68 /* Define HAVE_PTYS if the system supports pty devices.
  69    Note: PTYs are broken on darwin <6.  Use at your own risk.  */
  70 #define HAVE_PTYS
  71 /* Run only once.  We need a `for'-loop because the code uses `continue'.  */
  72 #define PTY_ITERATION   for (i = 0; i < 1; i++)
  73 #define PTY_NAME_SPRINTF        /* none */
  74 #define PTY_TTY_NAME_SPRINTF    /* none */
  75 /* Note that openpty may fork via grantpt on Mac OS X 10.4/Darwin 8.
  76    But we don't have to block SIGCHLD because it is blocked in the
  77    implementation of grantpt.  */
  78 #define PTY_OPEN                                                \
  79   do                                                            \
  80     {                                                           \
  81       int slave;                                                \
  82       if (openpty (&fd, &slave, pty_name, NULL, NULL) == -1)    \
  83         fd = -1;                                                \
  84       else                                                      \
  85         emacs_close (slave);                                    \
  86     }                                                           \
  87   while (0)
  88
  89 /* PTYs only work correctly on Darwin 7 or higher.  So make the default
  90    for process-connection-type dependent on the kernel version.  */
  91 #define MIN_PTY_KERNEL_VERSION '7'
  92
  93 /* Define CLASH_DETECTION if you want lock files to be written
  94    so that Emacs can tell instantly when you try to modify
  95    a file that someone else has modified in his Emacs.  */
  96 #define CLASH_DETECTION
  97
  98 /* Avoid the use of the name init_process (process.c) because it is
  99    also the name of a Mach system call.  */
 100 #define init_process emacs_init_process
 101
 102 /* Used in dispnew.c.  Copied from freebsd.h. */
 103 #define PENDING_OUTPUT_COUNT(FILE) ((FILE)->_p - (FILE)->_bf._base)
 104
 105 /* System uses OXTABS instead of the expected TAB3.  (Copied from bsd386.h.)  */
 106 #define TAB3 OXTABS
 107
 108 /* Define HAVE_SOCKETS if system supports 4.2-compatible sockets.  */
 109 #define HAVE_SOCKETS
 110
 111 /* Definitions for how to compile & link.  */
 112 #ifdef HAVE_NS
 113 #define SYSTEM_PURESIZE_EXTRA 200000
 114 #endif
 115
 116 /* On Darwin, res_init appears not to be useful: see bug#562 and
 117    http://lists.gnu.org/archive/html/emacs-devel/2007-11/msg01467.html  */
 118 #undef HAVE_RES_INIT
 119 #undef HAVE_LIBRESOLV
 120
 121 #ifdef emacs
 122 #define malloc unexec_malloc
 123 #define realloc unexec_realloc
 124 #define free unexec_free
 125 /* Don't use posix_memalign because it is not compatible with unexmacosx.c.  */
 126 #undef HAVE_POSIX_MEMALIGN
 127 #endif
 128
 129 /* Define the following so emacs symbols will not conflict with those
 130    in the System framework.  Otherwise -prebind will not work.  */
 131
 132 /* Do not define abort in emacs.c.  */
 133 #define NO_ABORT
 134
 135 /* Do not define matherr in floatfns.c.  */
 136 #define NO_MATHERR
 137
 138 /* The following solves the problem that Emacs hangs when evaluating
 139    (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
 140    does not exist.  Also, setsid is not allowed in the vfork child's
 141    context as of Darwin 9/Mac OS X 10.5.  */
 142 #undef HAVE_WORKING_VFORK
 143 #define vfork fork
 144
 145 /* Don't close pty in process.c to make it as controlling terminal.
 146    It is already a controlling terminal of subprocess, because we did
 147    ioctl TIOCSCTTY.  */
 148 #define DONT_REOPEN_PTY
 149
 150 /* Use the GC_MAKE_GCPROS_NOOPS (see lisp.h) method for marking the stack.  */
 151 #define GC_MARK_STACK   GC_MAKE_GCPROS_NOOPS
 152