1 /* System description header file for Darwin (Mac OS X).
3 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 2010 Free Software Foundation, Inc.
6 This file is part of GNU Emacs.
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.
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.
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/>. */
22 /* Define symbols to identify the version of Unix this is.
23 Define all the symbols that apply correctly. */
25 /* BSD4_3 and BSD4_4 are already defined in sys/param.h */
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. */
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"
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.
43 Define INTERRUPT_INPUT to make interrupt_input = 1 the default (use SIGIO)
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.
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.
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
60 #define INTERRUPT_INPUT
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'
66 /* Define HAVE_TERMIOS if the system provides POSIX-style
67 functions and macros for terminal control.
69 Define HAVE_TERMIO if the system provides sysV-style ioctls
72 Do not define both. HAVE_TERMIOS is preferred, if it is supported
77 /* Define HAVE_PTYS if the system supports pty devices.
78 Note: PTYs are broken on darwin <6. Use at your own risk. */
80 /* Run only once. We need a `for'-loop because the code uses `continue'. */
81 #define PTY_ITERATION for (i = 0; i < 1; i++)
82 #define PTY_NAME_SPRINTF /* none */
83 #define PTY_TTY_NAME_SPRINTF /* none */
84 /* Note that openpty may fork via grantpt on Mac OS X 10.4/Darwin 8.
85 But we don't have to block SIGCHLD because it is blocked in the
86 implementation of grantpt. */
91 if (openpty (&fd, &slave, pty_name, NULL, NULL) == -1) \
94 emacs_close (slave); \
98 /* PTYs only work correctly on Darwin 7 or higher. So make the default
99 for process-connection-type dependent on the kernel version. */
100 #define MIN_PTY_KERNEL_VERSION '7'
102 /* Define CLASH_DETECTION if you want lock files to be written
103 so that Emacs can tell instantly when you try to modify
104 a file that someone else has modified in his Emacs. */
105 #define CLASH_DETECTION
107 /* Avoid the use of the name init_process (process.c) because it is
108 also the name of a Mach system call. */
109 #define init_process emacs_init_process
111 /* Used in dispnew.c. Copied from freebsd.h. */
112 #define PENDING_OUTPUT_COUNT(FILE) ((FILE)->_p - (FILE)->_bf._base)
114 /* System uses OXTABS instead of the expected TAB3. (Copied from bsd386.h.) */
117 /* Define HAVE_SOCKETS if system supports 4.2-compatible sockets. */
120 /* start_of_text isn't actually used, so make it compile without error. */
121 #define TEXT_START (0)
123 /* Definitions for how to compile & link. */
125 #define SYSTEM_PURESIZE_EXTRA 200000
128 /* On Darwin, res_init appears not to be useful: see bug#562 and
129 http://lists.gnu.org/archive/html/emacs-devel/2007-11/msg01467.html */
131 #undef HAVE_LIBRESOLV
134 #define malloc unexec_malloc
135 #define realloc unexec_realloc
136 #define free unexec_free
137 /* Don't use posix_memalign because it is not compatible with unexmacosx.c. */
138 #undef HAVE_POSIX_MEMALIGN
141 /* Define the following so emacs symbols will not conflict with those
142 in the System framework. Otherwise -prebind will not work. */
144 /* Do not define abort in emacs.c. */
147 /* Do not define matherr in floatfns.c. */
150 /* The following solves the problem that Emacs hangs when evaluating
151 (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
152 does not exist. Also, setsid is not allowed in the vfork child's
153 context as of Darwin 9/Mac OS X 10.5. */
154 #undef HAVE_WORKING_VFORK
157 /* Don't close pty in process.c to make it as controlling terminal.
158 It is already a controlling terminal of subprocess, because we did
160 #define DONT_REOPEN_PTY
162 /* Use the GC_MAKE_GCPROS_NOOPS (see lisp.h) method for marking the stack. */
163 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
165 /* arch-tag: 481d443d-4f89-43ea-b5fb-49706d95fa41
166 (do not change this comment) */