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code.delx.au - gnu-emacs/blob - src/s/vms.h
1 /* system description header for VMS
2 Copyright (C) 1986 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
6 GNU Emacs is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 1, or (at your option)
11 GNU Emacs is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 * Define symbols to identify the version of Unix this is.
22 * Define all the symbols that apply correctly.
25 #ifndef VMS /* Decus cpp doesn't define this but VAX C does */
28 /* Note that this file is used indirectly via vms4-0.h, or some other
29 such file. These other files define a symbol VMS4_0, VMS4_2, etc. */
31 /* SYSTEM_TYPE should indicate the kind of system you are using.
32 It sets the Lisp variable system-type. */
34 #define SYSTEM_TYPE "vax-vms"
36 /* NOMULTIPLEJOBS should be defined if your system's shell
37 does not have "job control" (the ability to stop a program,
38 run some other program, then continue the first one). */
40 /* #define NOMULTIPLEJOBS */
42 /* INTERRUPT_INPUT controls a default for Unix systems.
43 VMS uses a separate mechanism. */
45 /* #define INTERRUPT_INPUT */
47 /* Letter to use in finding device name of first pty,
48 if system supports pty's. 'a' means it is /dev/ptya0 */
50 #define FIRST_PTY_LETTER 'a'
53 * Define HAVE_TIMEVAL if the system supports the BSD style clock values.
54 * Look in <sys/time.h> for a timeval structure.
57 /* #define HAVE_TIMEVAL */
60 * Define HAVE_SELECT if the system supports the `select' system call.
63 /* #define HAVE_SELECT */
66 * Define HAVE_PTYS if the system supports pty devices.
69 /* #define HAVE_PTYS */
71 /* Define HAVE_SOCKETS if system supports 4.2-compatible sockets. */
73 /* #define HAVE_SOCKETS */
76 * Define NONSYSTEM_DIR_LIBRARY to make Emacs emulate
77 * The 4.2 opendir, etc., library functions.
80 #define NONSYSTEM_DIR_LIBRARY
82 /* Define this symbol if your system has the functions bcopy, etc. */
86 /* subprocesses should be defined if you want to
87 have code for asynchronous subprocesses
88 (as used in M-x compile and M-x shell).
89 This is generally OS dependent, and not supported
90 under most USG systems. */
94 /* If your system uses COFF (Common Object File Format) then define the
95 preprocessor symbol "COFF". */
99 /* define MAIL_USE_FLOCK if the mailer uses flock
100 to interlock access to /usr/spool/mail/$USER.
101 The alternative is that a lock file named
102 /usr/spool/mail/$USER.lock. */
104 /* #define MAIL_USE_FLOCK */
106 /* Define CLASH_DETECTION if you want lock files to be written
107 so that Emacs can tell instantly when you try to modify
108 a file that someone else has modified in his Emacs. */
110 /* #define CLASH_DETECTION */
112 /* Define the maximum record length for print strings, if needed. */
114 #define MAX_PRINT_CHARS 300
117 /* Here, on a separate page, add any special hacks needed
118 to make Emacs work on this system. For example,
119 you might define certain system call names that don't
120 exist on your system, or that do different things on
121 your system and must be used only through an encapsulation
122 (Which you should place, by convention, in sysdep.c). */
124 /* Do you have the shareable library bug? If you link with a shareable
125 library that contains psects with the NOSHR attribute and also refer to
126 those psects in your program, the linker give you a private version of
127 the psect which is not related to the version used by the shareable
128 library. The end result is that your references to variables in that
129 psect have absolutely nothing to do with library references to what is
130 supposed to be the same variable. If you intend to link with the standard
131 C library (NOT the shareable one) you don't need to define this. (This
132 is NOT fixed in V4.4...) */
134 #define SHAREABLE_LIB_BUG
136 /* Partially due to the above mentioned bug and also so that we don't need
137 to require that people have a shareable C library, the default for Emacs
138 is to link with the non-shared library. If you want to link with the
139 shared library, define this and remake xmakefile and fileio.c. This allows
140 us to ship a guaranteed executable image. */
142 #define LINK_CRTL_SHARE
144 /* Define this if you want to read the file SYS$SYSTEM:SYSUAF.DAT for user
145 information. If you do use this, you must either make SYSUAF.DAT world
146 readable or install Emacs with SYSPRV. */
148 /* #define READ_SYSUAF */
150 /* On VMS these have a different name */
153 #define rindex strrchr
154 #define unlink delete
156 /* On later versions of VMS these exist in the C run time library, but
157 we are using our own implementations. Hide their names to avoid
159 #define rename sys_rename
160 #define execvp sys_execvp
161 #define system sys_system
163 /* Hide these names so that we don't get linker errors */
164 #define malloc sys_malloc
165 #define free sys_free
166 #define realloc sys_realloc
167 #define calloc sys_calloc
169 /* Don't use the standard brk and sbrk */
170 #define sbrk sys_sbrk
173 /* On VMS we want to avoid reading and writing very large amounts of
174 data at once, so we redefine read and write here. */
176 #define read sys_read
177 #define write sys_write
179 /* sys_creat just calls the real creat with additional args of
180 "rfm=var", "rat=cr" to get "normal" VMS files... */
181 #define creat sys_creat
183 /* fwrite forces an RMS PUT on every call. This is abysmally slow, so
184 we emulate fwrite with fputc, which forces buffering and is much
186 #define fwrite sys_fwrite
188 /* getuid only returns the member number, which is not unique on most VMS
189 systems. We emulate it with (getgid()<<16 | getuid()). */
190 #define getuid sys_getuid
192 /* If user asks for TERM, check first for EMACS_TERM. */
193 #define getenv sys_getenv
195 /* Standard C abort is less useful than it should be. */
196 #define abort sys_abort
198 /* Case conflicts with C library fread. */
201 /* Case conflicts with C library srandom. */
202 #define Srandom S_random
204 /* Cause initialization of vmsfns.c to be run. */
205 #define SYMS_SYSTEM syms_of_vmsfns ()
207 /* VAXCRTL access doesn't deal with SYSPRV very well (among other oddites...)
208 Here, we use $CHKPRO to really determine access. */
209 #define access sys_access
213 #define _longjmp longjmp
214 #define _setjmp setjmp
216 globalref
char sdata
[];
217 #define DATA_START (((int) sdata + 511) & ~511)
218 #define TEXT_START 512
220 /* Baud-rate values from tty status are not standard. */
222 #define BAUD_CONVERT \
223 { 0, 50, 75, 110, 134, 150, 300, 600, 1200, 1800, \
224 2000, 2400, 3600, 4800, 7200, 9600, 19200 }
226 #define PURESIZE 132000
228 /* Stdio FILE type has extra indirect on VMS, so must alter this macro. */
230 #define PENDING_OUTPUT_COUNT(FILE) ((*(FILE))->_ptr - (*(FILE))->_base)