src/s/freebsd.h

   1 /* System description header for FreeBSD systems.
   2
   3 Copyright (C) 1994-2012  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 /* This silences a few compilation warnings.  */
  27 #undef BSD_SYSTEM
  28 #if __FreeBSD__ == 1
  29 #define BSD_SYSTEM 199103
  30 #elif __FreeBSD__ == 2
  31 #define BSD_SYSTEM 199306
  32 #elif __FreeBSD__ >= 3
  33 #define BSD_SYSTEM 199506
  34 #endif
  35
  36 /* Don't close pty in process.c to make it as controlling terminal.
  37    It is already a controlling terminal of subprocess, because we did
  38    ioctl TIOCSCTTY.  */
  39 #define DONT_REOPEN_PTY
  40
  41 /* Circumvent a bug in FreeBSD.  In the following sequence of
  42    writes/reads on a PTY, read(2) returns bogus data:
  43
  44    write(2)  1022 bytes
  45    write(2)   954 bytes, get EAGAIN
  46    read(2)   1024 bytes in process_read_output
  47    read(2)     11 bytes in process_read_output
  48
  49    That is, read(2) returns more bytes than have ever been written
  50    successfully.  The 1033 bytes read are the 1022 bytes written
  51    successfully after processing (for example with CRs added if the
  52    terminal is set up that way which it is here).  The same bytes will
  53    be seen again in a later read(2), without the CRs.  */
  54 #define BROKEN_PTY_READ_AFTER_EAGAIN 1
  55
  56 /* Tell that garbage collector that setjmp is known to save all
  57    registers relevant for conservative garbage collection in the jmp_buf.  */
  58 #define GC_SETJMP_WORKS 1