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  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
  25 #define BSD4_2
  26 /* BSD4_3 and BSD4_4 are already defined in sys/param.h */
  27 #define BSD_SYSTEM
  28
  29 /* More specific than the above two.  We cannot use __APPLE__ as this
  30    may not be defined on non-OSX Darwin, and we cannot define DARWIN
  31    here because Panther and lower CoreFoundation.h uses DARWIN to
  32    distinguish OS X from pure Darwin. */
  33 #define DARWIN_OS
  34
  35
  36 /* SYSTEM_TYPE should indicate the kind of system you are using.
  37  It sets the Lisp variable system-type.  */
  38 #define SYSTEM_TYPE "darwin"
  39
  40 /* Emacs can read input using SIGIO and buffering characters itself,
  41    or using CBREAK mode and making C-g cause SIGINT.
  42    The choice is controlled by the variable interrupt_input.
  43
  44    Define INTERRUPT_INPUT to make interrupt_input = 1 the default (use SIGIO)
  45
  46    Emacs uses the presence or absence of the SIGIO and BROKEN_SIGIO macros
  47    to indicate whether or not signal-driven I/O is possible.  It uses
  48    INTERRUPT_INPUT to decide whether to use it by default.
  49
  50    SIGIO can be used only on systems that implement it (4.2 and 4.3).
  51    CBREAK mode has two disadvantages
  52      1) At least in 4.2, it is impossible to handle the Meta key properly.
  53         I hear that in system V this problem does not exist.
  54      2) Control-G causes output to be discarded.
  55         I do not know whether this can be fixed in system V.
  56
  57    Another method of doing input is planned but not implemented.
  58    It would have Emacs fork off a separate process
  59    to read the input and send it to the true Emacs process
  60    through a pipe. */
  61 #define INTERRUPT_INPUT
  62
  63 /* Letter to use in finding device name of first pty,
  64   if system supports pty's.  'a' means it is /dev/ptya0  */
  65 #define FIRST_PTY_LETTER 'p'
  66
  67 /*
  68  *      Define HAVE_TERMIOS if the system provides POSIX-style
  69  *      functions and macros for terminal control.
  70  *
  71  *      Define HAVE_TERMIO if the system provides sysV-style ioctls
  72  *      for terminal control.
  73  *
  74  *      Do not define both.  HAVE_TERMIOS is preferred, if it is
  75  *      supported on your system.
  76  */
  77 #define HAVE_TERMIOS
  78 #define NO_TERMIO
  79
  80 /*
  81  *      Define HAVE_PTYS if the system supports pty devices.
  82  *      Note: PTYs are broken on darwin <6.  Use at your own risk.
  83  */
  84 #define HAVE_PTYS
  85 /* Run only once.  We need a `for'-loop because the code uses
  86    `continue'.  */
  87 #define PTY_ITERATION   for (i = 0; i < 1; i++)
  88 #define PTY_NAME_SPRINTF        /* none */
  89 #define PTY_TTY_NAME_SPRINTF    /* none */
  90 /* Note that openpty may fork via grantpt on Mac OS X 10.4/Darwin 8.
  91    But we don't have to block SIGCHLD because it is blocked in the
  92    implementation of grantpt.  */
  93 #define PTY_OPEN                                                \
  94   do                                                            \
  95     {                                                           \
  96       int slave;                                                \
  97       if (openpty (&fd, &slave, pty_name, NULL, NULL) == -1)    \
  98         fd = -1;                                                \
  99       else                                                      \
 100         emacs_close (slave);                                    \
 101     }                                                           \
 102   while (0)
 103
 104 /**
 105  * PTYs only work correctly on Darwin 7 or higher.  So make the
 106  * default for process-connection-type dependent on the kernel
 107  * version.
 108  */
 109 #define MIN_PTY_KERNEL_VERSION '7'
 110
 111 /* Define this symbol if your system has the functions bcopy, etc. */
 112 #define BSTRING
 113
 114 /* Define CLASH_DETECTION if you want lock files to be written
 115    so that Emacs can tell instantly when you try to modify
 116    a file that someone else has modified in his Emacs.  */
 117 #define CLASH_DETECTION
 118
 119 /* Avoid the use of the name init_process (process.c) because it is
 120    also the name of a Mach system call.  */
 121 #define init_process emacs_init_process
 122
 123 /* Used in dispnew.c.  Copied from freebsd.h. */
 124 #define PENDING_OUTPUT_COUNT(FILE) ((FILE)->_p - (FILE)->_bf._base)
 125
 126 /* System uses OXTABS instead of the expected TAB3.  (Copied from
 127    bsd386.h.)  */
 128 #define TAB3 OXTABS
 129
 130 /* Darwin ld insists on the use of malloc routines in the System
 131    framework.  */
 132 #define SYSTEM_MALLOC
 133
 134 /* Define HAVE_SOCKETS if system supports 4.2-compatible sockets.  */
 135 #define HAVE_SOCKETS
 136
 137 /* Definitions for how to dump.  Copied from nextstep.h.  */
 138 #define UNEXEC unexmacosx.o
 139
 140 /* start_of_text isn't actually used, so make it compile without error.  */
 141 #define TEXT_START (0)
 142
 143 /* Definitions for how to compile & link.  */
 144 #ifdef HAVE_NS
 145 #define SYSTEM_PURESIZE_EXTRA 200000
 146 #endif
 147
 148 /* On Darwin, res_init appears not to be useful: see bug#562 and
 149    http://lists.gnu.org/archive/html/emacs-devel/2007-11/msg01467.html  */
 150 #undef HAVE_RES_INIT
 151 #undef HAVE_LIBRESOLV
 152
 153 #ifdef emacs
 154 #define malloc unexec_malloc
 155 #define realloc unexec_realloc
 156 #define free unexec_free
 157 /* Don't use posix_memalign because it is not compatible with
 158    unexmacosx.c.  */
 159 #undef HAVE_POSIX_MEMALIGN
 160 #endif
 161
 162 /* Link this program just by running cc.  */
 163 #define ORDINARY_LINK
 164
 165 /* Define the following so emacs symbols will not conflict with those
 166    in the System framework.  Otherwise -prebind will not work.  */
 167
 168 /* Do not define abort in emacs.c.  */
 169 #define NO_ABORT
 170
 171 /* Do not define matherr in floatfns.c.  */
 172 #define NO_MATHERR
 173
 174 /* The following solves the problem that Emacs hangs when evaluating
 175    (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
 176    does not exist.  Also, setsid is not allowed in the vfork child's
 177    context as of Darwin 9/Mac OS X 10.5.  */
 178 #undef HAVE_WORKING_VFORK
 179 #define vfork fork
 180
 181 /* Don't close pty in process.c to make it as controlling terminal.
 182    It is already a controlling terminal of subprocess, because we did
 183    ioctl TIOCSCTTY.  */
 184 #define DONT_REOPEN_PTY
 185
 186 /* Use the GC_MAKE_GCPROS_NOOPS (see lisp.h) method for marking the
 187    stack.  */
 188 #define GC_MARK_STACK   GC_MAKE_GCPROS_NOOPS
 189
 190 /* arch-tag: 481d443d-4f89-43ea-b5fb-49706d95fa41
 191    (do not change this comment) */