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d8875586 MBT |
1 | ?RCS: $Id: d_getpagsz.U 1 2006-08-24 12:32:52Z rmanfredi $ |
2 | ?RCS: | |
3 | ?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi | |
4 | ?RCS: | |
5 | ?RCS: You may redistribute only under the terms of the Artistic Licence, | |
6 | ?RCS: as specified in the README file that comes with the distribution. | |
7 | ?RCS: You may reuse parts of this distribution only within the terms of | |
8 | ?RCS: that same Artistic Licence; a copy of which may be found at the root | |
9 | ?RCS: of the source tree for dist 4.0. | |
10 | ?RCS: | |
11 | ?RCS: $Log: d_getpagsz.U,v $ | |
12 | ?RCS: Revision 3.0.1.1 1994/10/29 16:13:10 ram | |
13 | ?RCS: patch36: added ?F: line for metalint file checking | |
14 | ?RCS: | |
15 | ?RCS: Revision 3.0 1993/08/18 12:06:14 ram | |
16 | ?RCS: Baseline for dist 3.0 netwide release. | |
17 | ?RCS: | |
18 | ?MAKE:d_getpagsz pagesize: Oldconfig Myread Inlibc cat contains +cc +ccflags \ | |
19 | libs rm Findhdr | |
20 | ?MAKE: -pick add $@ %< | |
21 | ?S:d_getpagsz: | |
22 | ?S: This variable conditionally defines HAS_GETPAGESIZE if getpagesize() | |
23 | ?S: is available to get the system page size. | |
24 | ?S:. | |
25 | ?S:pagesize (pagsize): | |
26 | ?S: This variable holds the size in bytes of a system page. | |
27 | ?S:. | |
28 | ?C:HAS_GETPAGESIZE (GETPAGESIZE): | |
29 | ?C: This symbol, if defined, indicates that the getpagesize system call | |
30 | ?C: is available to get system page size, which is the granularity of | |
31 | ?C: many memory management calls. | |
32 | ?C:. | |
33 | ?X: Don't name it PAGESIZE, this is sometimes used by <sys/param.h> | |
34 | ?C:PAGESIZE_VALUE (PAGSIZE): | |
35 | ?C: This symbol holds the size in bytes of a system page (obtained via | |
36 | ?C: the getpagesize() system call at configuration time or asked to the | |
37 | ?C: user if the system call is not available). | |
38 | ?C:. | |
39 | ?H:#$d_getpagsz HAS_GETPAGESIZE /**/ | |
40 | ?H:#define PAGESIZE_VALUE $pagesize /* System page size, in bytes */ | |
41 | ?H:. | |
42 | ?F:!page | |
43 | ?T:guess | |
44 | ?LINT:set d_getpagsz | |
45 | : see if getpagesize exists | |
46 | set getpagesize d_getpagsz | |
47 | eval $inlibc | |
48 | ||
49 | @if pagesize || PAGESIZE_VALUE | |
50 | : determine the system page size | |
51 | echo " " | |
52 | guess=' (OK to guess)' | |
53 | case "$pagesize" in | |
54 | '') | |
55 | $cat >page.c <<EOP | |
56 | extern int getpagesize(); | |
57 | int main() | |
58 | { | |
59 | printf("%d\n", getpagesize()); | |
60 | } | |
61 | EOP | |
62 | echo "Computing the granularity of memory management calls..." >&4 | |
63 | dflt='4096' | |
64 | case "$d_getpagsz" in | |
65 | "$define") | |
66 | if $cc $ccflags -o page page.c $libs >/dev/null 2>&1; then | |
67 | dflt=`./page` | |
68 | guess='' | |
69 | else | |
70 | echo "(I can't seem to compile the test program--guessing)" | |
71 | fi | |
72 | ;; | |
73 | *) | |
74 | if $cc $ccflags -o page page.c $libs -lPW >/dev/null 2>&1; then | |
75 | dflt=`./page` | |
76 | guess='' | |
77 | echo "(For your eyes only: I used the getpagesize() from -lPW.)" | |
78 | else | |
79 | if $contains PAGESIZE `./findhdr sys/param.h` >/dev/null 2>&1; then | |
80 | $cat >page.c <<EOP | |
81 | #include <sys/param.h> | |
82 | int main() | |
83 | { | |
84 | printf("%d\n", PAGESIZE); | |
85 | } | |
86 | EOP | |
87 | if $cc $ccflags -o page page.c $libs >/dev/null 2>&1; then | |
88 | dflt=`./page` | |
89 | guess='' | |
90 | echo "(Using value of PAGESIZE found in <sys/param.h>.)" | |
91 | fi | |
92 | fi | |
93 | fi | |
94 | ;; | |
95 | esac | |
96 | ;; | |
97 | *) dflt="$pagesize"; guess='';; | |
98 | esac | |
99 | rp="What is the system page size, in bytes$guess?" | |
100 | . ./myread | |
101 | pagesize=$ans | |
102 | $rm -f page.c page | |
103 | ||
104 | @end |