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1 This directory contains C header files containing
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2 operating-system-specific definitions. Each file describes a
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3 particular operating system. The emacs configuration script edits
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4 ../config.h to include the appropriate one of these files, and then
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5 each emacs source file includes config.h.
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6
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7 template.h is a generic template for system descriptions; it describes
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8 the parameters a system file can specify.
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9
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10 General XEmacs Changes
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11 ---------------------------
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12 The following is a list of those changes made globally across all
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13 files. They are not marked individually in each header file. All
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14 other changes should be preceded by a comment /* XEmacs change */.
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15
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16
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17 1. Removed all #defines of [read|write|open|close]. This is now
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18 handled automatically by checking the INTERRUPTIBLE_IO etc. flags.
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19
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20 2. Removed all instances of #undef SIGIO and replaced them with
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21 #define BROKEN_SIGIO. Jamie says:
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22
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23 /* use BROKEN_SIGIO instead of this kludge -- jwz */
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24
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25 3. All instances of HAVE_GETWD, HAVE_DUP2, HAVE_UNISTD_H, NEED_UNISTD_H,
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26 HAVE_GETTIMEOFDAY and NEED_REALPATH removed. We detect these
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27 automatically with configure.
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28
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29 4. All instances of HAVE_X11 replaced with HAVE_X_WINDOWS. We don't
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30 support X10 or earlier so the HAVE_X11 define was purged.
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31
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32 5. Most of the signal crap (e.g. redefining sigsetmask, defining
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33 POSIX_SIGNALS) has been removed. There are four possible
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34 signal paradigms that all systems fall into, and we auto-detect
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35 them in configure and handle them in syssignal.h.
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36
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37 6. Removed references to INTERRUPT_INPUT. XEmacs does not use
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38 this bizarre way of reading input.
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39
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40 7. Removed references to BROKEN_FIONREAD. FIONREAD is used only
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41 in INTERRUPT_INPUT and in the select() emulator, neither of
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42 which are supported in XEmacs.
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43
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44 8. Removed references to NOMULTIPLEJOBS. This is unused in XEmacs
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45 and in FSF Emacs.
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46
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47 9. Removed references to HAVE_WAIT_HEADER and WAIT_USE_INT.
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48 They are unnecessary with the cleaned up syswait.h in XEmacs.
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49 (We autodetect sys/wait.h). Instead, #define or #undef
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50 HAVE_UNION_WAIT.
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51
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52 10. Removed BSTRING. Not used anywhere. (If the header file
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53 says there are bugs in bcopy() or the like, however, a
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54 #define BROKEN_BCOPY is added for reference.)
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55
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56 11. Removed #defines of bcopy, bzero, bcmp, index, rindex.
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57 XEmacs makes consistent use of the ANSI-equivalent
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58 functions memcpy, memset, memcmp, strchr, strrchr.
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59
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60 12. '#define subprocesses' removed. Use '#define NO_SUBPROCESSES'
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61 if they don't exist.
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62
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63 13. References to HAVE_VFORK removed. configure detects this.
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64
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65 14. Removed references to SYSV_SYSTEM_DIR, NONSYSTEM_DIR_LIBRARY,
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66 HAVE_SOCKETS, HAVE_SYSVIPC. configure detects these.
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67
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68 15. Removed defines of HAVE_TERMIOS, HAVE_TERMIO, and
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69 HAVE_TCATTR (when HAVE_TERMIOS was also defined).
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70 configure detects these and systty.h automatically defines
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71 HAVE_TCATTR when HAVE_TERMIOS is defined.
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72
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73 16. Removed SETPGRP_RELEASES_CTTY. Not necessary any more, with
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74 fixed definitions of EMACS_SEPARATE_PROCESS_GROUP et al.
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75
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76 17. Removed defines of NLIST_STRUCT. configure detects this.
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77
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78 18. Removed defines of _setjmp and _longjmp. configure detects this.
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79
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80 19. Removed all '#define static' business. Defines NO_REMAP instead.
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81
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82 20. Removed defines of HAVE_MACH_MACH_H. configure detects this.
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