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Subject:	checking for working mmap...no
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Reply-To:	sds AT gnu DOT org
X-Attribution:	Sam
X-Disclaimer:	You should not expect anyone to agree with me.
From:	Sam Steingold <sds AT gnu DOT org>
Mail-Followup-To:	cygwin AT cygwin DOT com
Date:	Wed, 15 Sep 2004 15:20:50 -0400
Message-ID:	<uk6uvnxt9.fsf@gnu.org>
User-Agent:	Gnus/5.1003 (Gnus v5.10.3) Emacs/21.3.50 (windows-nt)
MIME-Version:	1.0

It appears that cygwin mmap() is lacking:

configure:20536: checking for working mmap
configure:20617: gcc -o conftest.exe -g -O2 conftest.c  >&5
configure:20620: $? = 0
configure:20622: ./conftest.exe
configure:20625: $? = 1
configure: program exited with status 1
configure: failed program was:

| /* confdefs.h.  */
| 
| #include <stdlib.h>
| #ifdef HAVE_UNISTD_H
| #include <unistd.h>
| #endif
| #include <fcntl.h>
| #ifdef OPEN_NEEDS_SYS_FILE_H
| #include <sys/file.h>
| #endif
| #include <sys/types.h>
| #include <sys/mman.h>
| int main () {
| 
|   int flags = MAP_ANON | MAP_PRIVATE;
|   int fd = -1;
| #define bits_to_avoid 0
| #define my_shift 24
| #define my_low   1
| #ifdef FOR_SUN4_29
| #define my_high  31
| #define my_size  32768 /* hope that 32768 is a multiple of the page size */
| /* i*32 KB for i=1..31 gives a total of 15.5 MB, which is close to what we need */
| #else
| #define my_high  64
| #define my_size  8192 /* hope that 8192 is a multiple of the page size */
| /* i*8 KB for i=1..64 gives a total of 16.25 MB, which is close to what we need */
| #endif
|  {long i;
| #define i_ok(i)  ((i) & (bits_to_avoid >> my_shift) == 0)
|   for (i=my_low; i<=my_high; i++)
|     if (i_ok(i))
|       { caddr_t addr = (caddr_t)(i << my_shift);
| /* Check for 8 MB, not 16 MB. This is more likely to work on Solaris 2. */
| #if bits_to_avoid
|         long size = i*my_size;
| #else
|         long size = ((i+1)/2)*my_size;
| #endif
|         if (mmap(addr,size,PROT_READ|PROT_WRITE,flags|MAP_FIXED,fd,0) == (void*)-1) exit(1);
|     }
| #define x(i)  *(unsigned char *) ((i<<my_shift) + (i*i))
| #define y(i)  (unsigned char)((3*i-4)*(7*i+3))
|   for (i=my_low; i<=my_high; i++) if (i_ok(i)) { x(i) = y(i); }
|   for (i=my_high; i>=my_low; i--) if (i_ok(i)) { if (x(i) != y(i)) exit(1); }
|   exit(0);
| }}

Thanks!

the above is from the CLISP configure, see
http://cvs.sourceforge.net/viewcvs.py/*checkout*/clisp/clisp/src/m4/mmap.m4

-- 
Sam Steingold (http://www.podval.org/~sds) running w2k
<http://www.camera.org> <http://www.iris.org.il> <http://www.memri.org/>
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