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1 | # @(#)README 8.1 (Berkeley) 6/2/93 |
2 | ||
3 | This is the directory to use for creating a library of the dbopen(3) | |
4 | routines. The Makefile builds the base system. By changing it and | |
5 | the compat.h file, you should be able to pick and choose the various | |
6 | things your system needs to make libdb run. | |
7 | ||
8 | The knobs that you may have to turn: | |
9 | ||
10 | In the Makefile: | |
11 | If you don't have mktemp(3) or mkstemp(3) on your system, add | |
12 | "mktemp.o" to the MISC list. | |
13 | ||
14 | If you don't have snprintf(3) on your system, add snprintf.o | |
15 | to the MISC list. | |
16 | ||
17 | If you don't have memmove(3), add memmove.o to the MISC list. | |
18 | ||
19 | In include/compat.h: | |
20 | Before attempting to build this library, you should skim through | |
21 | the compat.h file, and adjust it as necessary for your system. | |
22 | It's possible to use the #ifndef construct to figure out if a | |
23 | #ifdef has been set, but C provides no similar method to figure | |
24 | out if a typedef has been done. All of the typedef's are grouped | |
25 | at the top of compat.h, your compile errors will tell you which | |
26 | ones you need. | |
27 | ||
28 | Particularly subtle problems can occur if you don't have the | |
29 | BYTE_ORDER set right or if the realloc define is wrong. | |
30 | ||
31 | Some other problems: | |
32 | You may see warning messages about illegal pointer combinations. | |
33 | It's because systems prototype malloc, calloc and realloc in | |
34 | different places. If you want to stop the warnings, find out | |
35 | where your system prototypes them, and include it in compat.h, | |
36 | or, just prototype them yourself. | |
37 | ||
38 | To install: | |
39 | Programs using the dbopen(3) interface have to include db.h. | |
40 | To install the library, you'll need to put db.h (found in the | |
41 | directory PORT/include) and the library libdb.a in some place | |
42 | accesible to your program. | |
43 | ||
44 | Hints: | |
45 | SunOS 4.1.2 works with ``MISC=realloc.o snprintf.o memmove.o'' | |
46 | and the include/compat.h realloc ``#if 0'' changed to ``#if 1''. | |
47 | SunOS gives a bunch of warning messages on the malloc family | |
48 | routines. | |
49 | ||
50 | Ultrix 4.2A works with ``MISC=realloc.o snprintf.o memmove.o'' | |
51 | and the include/compat.h realloc ``#if 0'' changed to ``#if 1'' | |
52 | and BYTE_ORDER changed from BIG_ENDIAN to LITTLE_ENDIAN. | |
53 | Ultrix does not give warning messages on the malloc family | |
54 | routines. | |
55 | ||
56 | The recno routines require the mmap(2) call. It wouldn't be | |
57 | difficult to port this package to a system without mmap. Change | |
58 | rec_open.c to do slightly different initialization and to write | |
59 | two new routines for rec_get.c that handle regular files using | |
60 | reads and writes. |