file/PORTING

   1 $NetBSD: PORTING,v 1.5 1998/09/20 15:27:15 christos Exp $
   2 Portability of the new file(1) command.
   3 @(#) Id: PORTING,v 1.11 1993/09/23 21:47:23 christos Exp
   4
   5 Read this file only if the program doesn't compile on your system.
   6
   7 This release has been around UNIX; it has been compiled and tested
   8 in the following environments:
   9
  10 SunOS sqarc 4.1.1 8 sun4
  11         No problems.
  12 ULTRIX squint 4.2 0 RISC
  13         No problems.
  14 A/UX sqmac 3.0a9 SVR22 mc68020
  15         No problems.
  16 AIX sqibm 2 3 000XXXXXX100
  17         Had weird "make" problems making "magic" file automatically; just
  18         built it by hand. Your mileage may vary.
  19 SCO sqwang 3.2 2 i386
  20         Compiles fine; their weird make can't handle "[a-z]*" as a dependancy,
  21         so build magic by hand. Runs fine.
  22 sqzme sqzme 3.1.1 3 3B2
  23         The 3B2 SVR3 needed a few tweaks as well as COPTS = -Ilocalinc
  24         in order to compile.
  25
  26 This version, reluctanly, includes <stdlib.h>, which won't exist
  27 on older systems or those that aren't even close to the ANSI C
  28 standard. There is a null "stdlib.h", and some other bogus headers,
  29 in subdirectory "localinc"; if you get complaints about missing
  30 stdlib.h and others, uncomment the line with COPTS=-Ilocalinc
  31 in the Makefile, and try again.
  32
  33 You must have either <stdarg.h> or the older <varargs.h>, otherwise you'll
  34 have to butcher some routines in print.c.
  35
  36 Beyond that, I have tried to make a program that doesn't need any
  37 command-line defines (-D) to specify what version of UNIX is in use,
  38 by using the definitions available in the system #include
  39 files. For example, the lstat(2) call is normally found in
  40 4BSD systems, but might be grafted into some other variant
  41 of UNIX. If it's done right (ie., using the same definitions),
  42 my program will compile and work correctly. Look at the #ifdefs
  43 to see how it's done.
  44
  45 I've also tried to include source for all the non-portable library routines
  46 I used (getopt, str*).   Non-portable here means `not in every
  47 reasonably standard UNIX out there: V7, System V, 4BSD'.
  48 These are in subdirectory "localsrc", and not used unless you
  49 need them; again, see the Makefile.
  50
  51 There is one area that just might cause problems. On System
  52 V, they moved the definition of major() and minor() out of
  53 <sys/types.h> into <sys/sysmacros.h>.  Hence, if major isn't
  54 defined after including types.h, I automatically include sys/sysmacros.h.
  55 This will work for 99% of the systems out there. ONLY if you
  56 have a system in which  neither types.h nor sysmacros.h defines
  57 `major' will this automatic include fail (I hope). On such
  58 systems, you will get a compilation error in trying to compile
  59 a warning message. Please do the following:
  60
  61         1) change the appropriate #include at the start of fsmagic.c
  62 and     2) let me know the name of the system, the release number,
  63            and the name of the header file that *does* include
  64            this "standard" definition.
  65
  66 If you are running the old Ritchie PDP-11 C compiler or
  67 some other compiler that doesn't know about `void', you will have
  68 to include `-Dvoid=int' in the variable COPTS in the Makefile.
  69
  70 Other than this, there should be no portability problems,
  71 but one never knows these days. Please let me know of any
  72 other problems you find porting to a UNIX system. I don't much
  73 care about non-UNIX systems but will collect widely-used magic
  74 numbers for them as well as for UNIX systems.
  75
  76 Mark Moraes and Christos Zoulas
  77 (address in README)