Skip to content

R
riscv-gcc-1
Commit c0daa902 by Michael Koch Committed by Michael Koch
Options

configure.in: Added check for memory mapping of files. 

2003-03-02  Michael Koch  <konqueror@gmx.de>

	* configure.in: Added check for memory mapping of files.
	* configure: Regenerated.
	* config.h.in: Regenerated.

From-SVN: r63661
parent 23cdb465
Showing with 279 additions and 0 deletions
libjava/ChangeLog
2003-03-02 Michael Koch <konqueror@gmx.de>
* configure.in: Added check for memory mapping of files.
* configure: Regenerated.
* config.h.in: Regenerated.
2003-03-01 Jason Thorpe <thorpej@wasabisystems.com>
* posix-threads.cc: Include <unistd.h> if HAVE_UNISTD_H is defined.
......
libjava/configure
......@@ -8274,6 +8274,272 @@ EOF
fi
for ac_hdr in unistd.h
do
ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
echo "configure:8268: checking for $ac_hdr" >&5
if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
cat > conftest.$ac_ext <<EOF
#line 8273 "configure"
#include "confdefs.h"
#include <$ac_hdr>
EOF
ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
{ (eval echo configure:8278: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
if test -z "$ac_err"; then
rm -rf conftest*
eval "ac_cv_header_$ac_safe=yes"
else
echo "$ac_err" >&5
echo "configure: failed program was:" >&5
cat conftest.$ac_ext >&5
rm -rf conftest*
eval "ac_cv_header_$ac_safe=no"
fi
rm -f conftest*
fi
if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
echo "$ac_t""yes" 1>&6
ac_tr_hdr=HAVE_`echo $ac_hdr | sed 'y%abcdefghijklmnopqrstuvwxyz./-%ABCDEFGHIJKLMNOPQRSTUVWXYZ___%'`
cat >> confdefs.h <<EOF
#define $ac_tr_hdr 1
EOF
else
echo "$ac_t""no" 1>&6
fi
done
for ac_func in getpagesize
do
echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
echo "configure:8307: checking for $ac_func" >&5
if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
cat > conftest.$ac_ext <<EOF
#line 8312 "configure"
#include "confdefs.h"
/* System header to define __stub macros and hopefully few prototypes,
which can conflict with char $ac_func(); below. */
#include <assert.h>
/* Override any gcc2 internal prototype to avoid an error. */
/* We use char because int might match the return type of a gcc2
builtin and then its argument prototype would still apply. */
char $ac_func();
int main() {
/* The GNU C library defines this for functions which it implements
to always fail with ENOSYS. Some functions are actually named
something starting with __ and the normal name is an alias. */
#if defined (__stub_$ac_func) || defined (__stub___$ac_func)
choke me
#else
$ac_func();
#endif
; return 0; }
EOF
if { (eval echo configure:8335: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
rm -rf conftest*
eval "ac_cv_func_$ac_func=yes"
else
echo "configure: failed program was:" >&5
cat conftest.$ac_ext >&5
rm -rf conftest*
eval "ac_cv_func_$ac_func=no"
fi
rm -f conftest*
fi
if eval "test \"`echo '$ac_cv_func_'$ac_func`\" = yes"; then
echo "$ac_t""yes" 1>&6
ac_tr_func=HAVE_`echo $ac_func | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
cat >> confdefs.h <<EOF
#define $ac_tr_func 1
EOF
else
echo "$ac_t""no" 1>&6
fi
done
echo $ac_n "checking for working mmap""... $ac_c" 1>&6
echo "configure:8360: checking for working mmap" >&5
if eval "test \"`echo '$''{'ac_cv_func_mmap_fixed_mapped'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
if test "$cross_compiling" = yes; then
ac_cv_func_mmap_fixed_mapped=no
else
cat > conftest.$ac_ext <<EOF
#line 8368 "configure"
#include "confdefs.h"
/* Thanks to Mike Haertel and Jim Avera for this test.
Here is a matrix of mmap possibilities:
mmap private not fixed
mmap private fixed at somewhere currently unmapped
mmap private fixed at somewhere already mapped
mmap shared not fixed
mmap shared fixed at somewhere currently unmapped
mmap shared fixed at somewhere already mapped
For private mappings, we should verify that changes cannot be read()
back from the file, nor mmap's back from the file at a different
address. (There have been systems where private was not correctly
implemented like the infamous i386 svr4.0, and systems where the
VM page cache was not coherent with the filesystem buffer cache
like early versions of FreeBSD and possibly contemporary NetBSD.)
For shared mappings, we should conversely verify that changes get
propogated back to all the places they're supposed to be.
Grep wants private fixed already mapped.
The main things grep needs to know about mmap are:
* does it exist and is it safe to write into the mmap'd area
* how to use it (BSD variants) */
#include <sys/types.h>
#include <fcntl.h>
#include <sys/mman.h>
/* This mess was copied from the GNU getpagesize.h. */
#ifndef HAVE_GETPAGESIZE
# ifdef HAVE_UNISTD_H
# include <unistd.h>
# endif
/* Assume that all systems that can run configure have sys/param.h. */
# ifndef HAVE_SYS_PARAM_H
# define HAVE_SYS_PARAM_H 1
# endif
# ifdef _SC_PAGESIZE
# define getpagesize() sysconf(_SC_PAGESIZE)
# else /* no _SC_PAGESIZE */
# ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
# ifdef EXEC_PAGESIZE
# define getpagesize() EXEC_PAGESIZE
# else /* no EXEC_PAGESIZE */
# ifdef NBPG
# define getpagesize() NBPG * CLSIZE
# ifndef CLSIZE
# define CLSIZE 1
# endif /* no CLSIZE */
# else /* no NBPG */
# ifdef NBPC
# define getpagesize() NBPC
# else /* no NBPC */
# ifdef PAGESIZE
# define getpagesize() PAGESIZE
# endif /* PAGESIZE */
# endif /* no NBPC */
# endif /* no NBPG */
# endif /* no EXEC_PAGESIZE */
# else /* no HAVE_SYS_PARAM_H */
# define getpagesize() 8192 /* punt totally */
# endif /* no HAVE_SYS_PARAM_H */
# endif /* no _SC_PAGESIZE */
#endif /* no HAVE_GETPAGESIZE */
#ifdef __cplusplus
extern "C" { void *malloc(unsigned); }
#else
char *malloc();
#endif
int
main()
{
char *data, *data2, *data3;
int i, pagesize;
int fd;
pagesize = getpagesize();
/*
* First, make a file with some known garbage in it.
*/
data = malloc(pagesize);
if (!data)
exit(1);
for (i = 0; i < pagesize; ++i)
*(data + i) = rand();
umask(0);
fd = creat("conftestmmap", 0600);
if (fd < 0)
exit(1);
if (write(fd, data, pagesize) != pagesize)
exit(1);
close(fd);
/*
* Next, try to mmap the file at a fixed address which
* already has something else allocated at it. If we can,
* also make sure that we see the same garbage.
*/
fd = open("conftestmmap", O_RDWR);
if (fd < 0)
exit(1);
data2 = malloc(2 * pagesize);
if (!data2)
exit(1);
data2 += (pagesize - ((int) data2 & (pagesize - 1))) & (pagesize - 1);
if (data2 != mmap(data2, pagesize, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_FIXED, fd, 0L))
exit(1);
for (i = 0; i < pagesize; ++i)
if (*(data + i) != *(data2 + i))
exit(1);
/*
* Finally, make sure that changes to the mapped area
* do not percolate back to the file as seen by read().
* (This is a bug on some variants of i386 svr4.0.)
*/
for (i = 0; i < pagesize; ++i)
*(data2 + i) = *(data2 + i) + 1;
data3 = malloc(pagesize);
if (!data3)
exit(1);
if (read(fd, data3, pagesize) != pagesize)
exit(1);
for (i = 0; i < pagesize; ++i)
if (*(data + i) != *(data3 + i))
exit(1);
close(fd);
unlink("conftestmmap");
exit(0);
}
EOF
if { (eval echo configure:8508: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
then
ac_cv_func_mmap_fixed_mapped=yes
else
echo "configure: failed program was:" >&5
cat conftest.$ac_ext >&5
rm -fr conftest*
ac_cv_func_mmap_fixed_mapped=no
fi
rm -fr conftest*
fi
fi
echo "$ac_t""$ac_cv_func_mmap_fixed_mapped" 1>&6
if test $ac_cv_func_mmap_fixed_mapped = yes; then
cat >> confdefs.h <<\EOF
#define HAVE_MMAP 1
EOF
fi
for ac_prog in perl
do
......
libjava/configure.in
......@@ -970,6 +970,7 @@ AC_TRY_COMPILE([#include <time.h>], [struct tm tim; tim.tm_gmtoff = 0;],
[AC_MSG_RESULT(no)])])])
AC_FUNC_ALLOCA
AC_FUNC_MMAP
AC_CHECK_PROGS(PERL, perl, false)
......
libjava/include/config.h.in
......@@ -13,6 +13,9 @@
/* Define if you have <alloca.h> and it should be used (not on Ultrix). */
#undef HAVE_ALLOCA_H
/* Define if you have a working `mmap' system call. */
#undef HAVE_MMAP
/* Define if you have <sys/wait.h> that is POSIX.1 compatible. */
#undef HAVE_SYS_WAIT_H
......@@ -217,6 +220,9 @@
/* Define if you have the gethostname function. */
#undef HAVE_GETHOSTNAME
/* Define if you have the getpagesize function. */
#undef HAVE_GETPAGESIZE
/* Define if you have the getpwuid_r function. */
#undef HAVE_GETPWUID_R
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment