src/s/darwin.h

   1 /* System description header file for Darwin (Mac OS X).
   2    Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007,
   3                  2008, 2009, 2010 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 /*
  22  *      Define symbols to identify the version of Unix this is.
  23  *      Define all the symbols that apply correctly.
  24  */
  25
  26 #define BSD4_2
  27 /* BSD4_3 and BSD4_4 are already defined in sys/param.h */
  28 #define BSD_SYSTEM
  29
  30 /* More specific than the above two.  We cannot use __APPLE__ as this
  31    may not be defined on non-OSX Darwin, and we cannot define DARWIN
  32    here because Panther and lower CoreFoundation.h uses DARWIN to
  33    distinguish OS X from pure Darwin. */
  34
  35 #define DARWIN_OS
  36
  37
  38 /* SYSTEM_TYPE should indicate the kind of system you are using.
  39  It sets the Lisp variable system-type.  */
  40
  41 #define SYSTEM_TYPE "darwin"
  42
  43 /* Emacs can read input using SIGIO and buffering characters itself,
  44    or using CBREAK mode and making C-g cause SIGINT.
  45    The choice is controlled by the variable interrupt_input.
  46
  47    Define INTERRUPT_INPUT to make interrupt_input = 1 the default (use SIGIO)
  48
  49    Emacs uses the presence or absence of the SIGIO and BROKEN_SIGIO macros
  50    to indicate whether or not signal-driven I/O is possible.  It uses
  51    INTERRUPT_INPUT to decide whether to use it by default.
  52
  53    SIGIO can be used only on systems that implement it (4.2 and 4.3).
  54    CBREAK mode has two disadvantages
  55      1) At least in 4.2, it is impossible to handle the Meta key properly.
  56         I hear that in system V this problem does not exist.
  57      2) Control-G causes output to be discarded.
  58         I do not know whether this can be fixed in system V.
  59
  60    Another method of doing input is planned but not implemented.
  61    It would have Emacs fork off a separate process
  62    to read the input and send it to the true Emacs process
  63    through a pipe. */
  64
  65 #define INTERRUPT_INPUT
  66
  67 /* Letter to use in finding device name of first pty,
  68   if system supports pty's.  'a' means it is /dev/ptya0  */
  69
  70 #define FIRST_PTY_LETTER 'p'
  71
  72 /*
  73  *      Define HAVE_TERMIOS if the system provides POSIX-style
  74  *      functions and macros for terminal control.
  75  *
  76  *      Define HAVE_TERMIO if the system provides sysV-style ioctls
  77  *      for terminal control.
  78  *
  79  *      Do not define both.  HAVE_TERMIOS is preferred, if it is
  80  *      supported on your system.
  81  */
  82
  83 #define HAVE_TERMIOS
  84
  85 #define NO_TERMIO
  86
  87 /*
  88  *      Define HAVE_PTYS if the system supports pty devices.
  89  *      Note: PTYs are broken on darwin <6.  Use at your own risk.
  90  */
  91
  92 #define HAVE_PTYS
  93 /* Run only once.  We need a `for'-loop because the code uses
  94    `continue'.  */
  95 #define PTY_ITERATION   for (i = 0; i < 1; i++)
  96 #define PTY_NAME_SPRINTF        /* none */
  97 #define PTY_TTY_NAME_SPRINTF    /* none */
  98 /* Note that openpty may fork via grantpt on Mac OS X 10.4/Darwin 8.
  99    But we don't have to block SIGCHLD because it is blocked in the
 100    implementation of grantpt.  */
 101 #define PTY_OPEN                                                \
 102   do                                                            \
 103     {                                                           \
 104       int slave;                                                \
 105       if (openpty (&fd, &slave, pty_name, NULL, NULL) == -1)    \
 106         fd = -1;                                                \
 107       else                                                      \
 108         emacs_close (slave);                                    \
 109     }                                                           \
 110   while (0)
 111
 112 /**
 113  * PTYs only work correctly on Darwin 7 or higher.  So make the
 114  * default for process-connection-type dependent on the kernel
 115  * version.
 116  */
 117 #define MIN_PTY_KERNEL_VERSION '7'
 118
 119 /* Define this symbol if your system has the functions bcopy, etc. */
 120
 121 #define BSTRING
 122
 123 /* define MAIL_USE_FLOCK if the mailer uses flock
 124    to interlock access to /usr/spool/mail/$USER.
 125    The alternative is that a lock file named
 126    /usr/spool/mail/$USER.lock.  */
 127
 128 #define MAIL_USE_FLOCK
 129
 130 /* Define CLASH_DETECTION if you want lock files to be written
 131    so that Emacs can tell instantly when you try to modify
 132    a file that someone else has modified in his Emacs.  */
 133
 134 #define CLASH_DETECTION
 135
 136 /* Avoid the use of the name init_process (process.c) because it is
 137    also the name of a Mach system call.  */
 138 #define init_process emacs_init_process
 139
 140 /* Used in dispnew.c.  Copied from freebsd.h. */
 141 #define PENDING_OUTPUT_COUNT(FILE) ((FILE)->_p - (FILE)->_bf._base)
 142
 143 /* System uses OXTABS instead of the expected TAB3.  (Copied from
 144    bsd386.h.)  */
 145 #define TAB3 OXTABS
 146
 147 /* Darwin ld insists on the use of malloc routines in the System
 148    framework.  */
 149 #define SYSTEM_MALLOC
 150
 151 /* Define HAVE_SOCKETS if system supports 4.2-compatible sockets.  */
 152 #define HAVE_SOCKETS
 153
 154 /* Definitions for how to dump.  Copied from nextstep.h.  */
 155
 156 #define UNEXEC unexmacosx.o
 157
 158 /* start_of_text isn't actually used, so make it compile without error.  */
 159 #define TEXT_START (0)
 160
 161 /* Definitions for how to compile & link.  */
 162
 163 #ifdef HAVE_NS
 164 #define SYSTEM_PURESIZE_EXTRA 200000
 165 #endif
 166
 167 /* On Darwin, res_init appears not to be useful: see bug#562 and
 168    http://lists.gnu.org/archive/html/emacs-devel/2007-11/msg01467.html  */
 169
 170 #undef HAVE_RES_INIT
 171 #undef HAVE_LIBRESOLV
 172
 173 #ifdef emacs
 174 #define malloc unexec_malloc
 175 #define realloc unexec_realloc
 176 #define free unexec_free
 177 /* Don't use posix_memalign because it is not compatible with
 178    unexmacosx.c.  */
 179 #undef HAVE_POSIX_MEMALIGN
 180 #endif
 181
 182 /* Link this program just by running cc.  */
 183 #define ORDINARY_LINK
 184
 185 /* Define the following so emacs symbols will not conflict with those
 186    in the System framework.  Otherwise -prebind will not work.  */
 187
 188 /* Do not define abort in emacs.c.  */
 189 #define NO_ABORT
 190
 191 /* Do not define matherr in floatfns.c.  */
 192 #define NO_MATHERR
 193
 194 /* The following solves the problem that Emacs hangs when evaluating
 195    (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
 196    does not exist.  Also, setsid is not allowed in the vfork child's
 197    context as of Darwin 9/Mac OS X 10.5.  */
 198 #undef HAVE_WORKING_VFORK
 199 #define vfork fork
 200
 201 /* Don't close pty in process.c to make it as controlling terminal.
 202    It is already a controlling terminal of subprocess, because we did
 203    ioctl TIOCSCTTY.  */
 204 #define DONT_REOPEN_PTY
 205
 206 /* Use the GC_MAKE_GCPROS_NOOPS (see lisp.h) method for marking the
 207    stack.  */
 208 #define GC_MARK_STACK   GC_MAKE_GCPROS_NOOPS
 209
 210 /* arch-tag: 481d443d-4f89-43ea-b5fb-49706d95fa41
 211    (do not change this comment) */