src/s/darwin.h

   1 /* System description header file for Darwin (Mac OS X).
   2
   3 Copyright (C) 2001-2012  Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20
  21 /* Define symbols to identify the version of Unix this is.
  22    Define all the symbols that apply correctly.  */
  23 #define BSD4_2
  24 /* BSD4_3 and BSD4_4 are already defined in sys/param.h */
  25 #define BSD_SYSTEM
  26
  27 /* More specific than the above two.  We cannot use __APPLE__ as this
  28    may not be defined on non-OSX Darwin, and we cannot define DARWIN
  29    here because Panther and lower CoreFoundation.h uses DARWIN to
  30    distinguish OS X from pure Darwin.  */
  31 #define DARWIN_OS
  32
  33
  34 /* Emacs can read input using SIGIO and buffering characters itself,
  35    or using CBREAK mode and making C-g cause SIGINT.
  36    The choice is controlled by the variable interrupt_input.
  37
  38    Define INTERRUPT_INPUT to make interrupt_input = 1 the default (use SIGIO)
  39
  40    Emacs uses the presence or absence of the SIGIO and BROKEN_SIGIO macros
  41    to indicate whether or not signal-driven I/O is possible.  It uses
  42    INTERRUPT_INPUT to decide whether to use it by default.
  43
  44    SIGIO can be used only on systems that implement it (4.2 and 4.3).
  45    CBREAK mode has two disadvantages
  46      1) At least in 4.2, it is impossible to handle the Meta key properly.
  47         I hear that in system V this problem does not exist.
  48      2) Control-G causes output to be discarded.
  49         I do not know whether this can be fixed in system V.
  50
  51    Another method of doing input is planned but not implemented.
  52    It would have Emacs fork off a separate process
  53    to read the input and send it to the true Emacs process
  54    through a pipe. */
  55 #define INTERRUPT_INPUT
  56
  57 /* Letter to use in finding device name of first pty,
  58   if system supports pty's.  'a' means it is /dev/ptya0  */
  59 #define FIRST_PTY_LETTER 'p'
  60
  61 /* Define HAVE_PTYS if the system supports pty devices.
  62    Note: PTYs are broken on darwin <6.  Use at your own risk.  */
  63 #define HAVE_PTYS
  64 /* Run only once.  We need a `for'-loop because the code uses `continue'.  */
  65 #define PTY_ITERATION   int i; for (i = 0; i < 1; i++)
  66 #define PTY_NAME_SPRINTF        /* none */
  67 #define PTY_TTY_NAME_SPRINTF    /* none */
  68 /* Note that openpty may fork via grantpt on Mac OS X 10.4/Darwin 8.
  69    But we don't have to block SIGCHLD because it is blocked in the
  70    implementation of grantpt.  */
  71 #define PTY_OPEN                                                \
  72   do                                                            \
  73     {                                                           \
  74       int slave;                                                \
  75       if (openpty (&fd, &slave, pty_name, NULL, NULL) == -1)    \
  76         fd = -1;                                                \
  77       else                                                      \
  78         emacs_close (slave);                                    \
  79     }                                                           \
  80   while (0)
  81
  82 /* PTYs only work correctly on Darwin 7 or higher.  So make the default
  83    for process-connection-type dependent on the kernel version.  */
  84 #define MIN_PTY_KERNEL_VERSION '7'
  85
  86 /* Define CLASH_DETECTION if you want lock files to be written
  87    so that Emacs can tell instantly when you try to modify
  88    a file that someone else has modified in his Emacs.  */
  89 #define CLASH_DETECTION
  90
  91 /* Avoid the use of the name init_process (process.c) because it is
  92    also the name of a Mach system call.  */
  93 #define init_process emacs_init_process
  94
  95 /* Used in dispnew.c.  Copied from freebsd.h. */
  96 #define PENDING_OUTPUT_COUNT(FILE) ((FILE)->_p - (FILE)->_bf._base)
  97
  98 /* System uses OXTABS instead of the expected TAB3.  (Copied from bsd386.h.)  */
  99 #define TAB3 OXTABS
 100
 101 /* Define HAVE_SOCKETS if system supports 4.2-compatible sockets.  */
 102 #define HAVE_SOCKETS
 103
 104 /* Definitions for how to compile & link.  */
 105 #ifdef HAVE_NS
 106 #define SYSTEM_PURESIZE_EXTRA 200000
 107 #endif
 108
 109 #ifdef emacs
 110 #define malloc unexec_malloc
 111 #define realloc unexec_realloc
 112 #define free unexec_free
 113 /* Don't use posix_memalign because it is not compatible with unexmacosx.c.  */
 114 #undef HAVE_POSIX_MEMALIGN
 115 #endif
 116
 117 /* Define the following so emacs symbols will not conflict with those
 118    in the System framework.  Otherwise -prebind will not work.  */
 119
 120 /* Do not define abort in emacs.c.  */
 121 #define NO_ABORT
 122
 123 /* Do not define matherr in floatfns.c.  */
 124 #define NO_MATHERR
 125
 126 /* The following solves the problem that Emacs hangs when evaluating
 127    (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
 128    does not exist.  Also, setsid is not allowed in the vfork child's
 129    context as of Darwin 9/Mac OS X 10.5.  */
 130 #undef HAVE_WORKING_VFORK
 131 #define vfork fork
 132
 133 /* Don't close pty in process.c to make it as controlling terminal.
 134    It is already a controlling terminal of subprocess, because we did
 135    ioctl TIOCSCTTY.  */
 136 #define DONT_REOPEN_PTY