src/s/freebsd.h

   1 /* System description header for FreeBSD systems.
   2
   3 Copyright (C) 1994-2011  Free Software Foundation, Inc.
   4
   5 Author: Shawn M. Carey
   6 (according to authors.el)
   7
   8 This file is part of GNU Emacs.
   9
  10 GNU Emacs is free software: you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation, either version 3 of the License, or
  13 (at your option) any later version.
  14
  15 GNU Emacs is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 /* Get most of the stuff from bsd-common */
  24 #include "bsd-common.h"
  25
  26 #define PENDING_OUTPUT_COUNT(FILE) ((FILE)->_p - (FILE)->_bf._base)
  27
  28 /* This silences a few compilation warnings.  */
  29 #undef BSD_SYSTEM
  30 #if __FreeBSD__ == 1
  31 #define BSD_SYSTEM 199103
  32 #elif __FreeBSD__ == 2
  33 #define BSD_SYSTEM 199306
  34 #elif __FreeBSD__ >= 3
  35 #define BSD_SYSTEM 199506
  36 #endif
  37
  38 /* Don't close pty in process.c to make it as controlling terminal.
  39    It is already a controlling terminal of subprocess, because we did
  40    ioctl TIOCSCTTY.  */
  41 #define DONT_REOPEN_PTY
  42
  43 /* Circumvent a bug in FreeBSD.  In the following sequence of
  44    writes/reads on a PTY, read(2) returns bogus data:
  45
  46    write(2)  1022 bytes
  47    write(2)   954 bytes, get EAGAIN
  48    read(2)   1024 bytes in process_read_output
  49    read(2)     11 bytes in process_read_output
  50
  51    That is, read(2) returns more bytes than have ever been written
  52    successfully.  The 1033 bytes read are the 1022 bytes written
  53    successfully after processing (for example with CRs added if the
  54    terminal is set up that way which it is here).  The same bytes will
  55    be seen again in a later read(2), without the CRs.  */
  56 #define BROKEN_PTY_READ_AFTER_EAGAIN 1
  57
  58 /* Tell that garbage collector that setjmp is known to save all
  59    registers relevant for conservative garbage collection in the jmp_buf.  */
  60 #define GC_SETJMP_WORKS 1
  61
  62 /* Use the GC_MAKE_GCPROS_NOOPS (see lisp.h) method for marking the stack.  */
  63 #define GC_MARK_STACK   GC_MAKE_GCPROS_NOOPS