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dnl -*- Autoconf -*-
dnl Copyright (C) 1993-2009 Free Software Foundation, Inc.
dnl Copyright (C) 1993-2004 Free Software Foundation, Inc.
dnl This file is free software, distributed under the terms of the GNU
dnl General Public License. As a special exception to the GNU General
dnl Public License, this file may be distributed as part of a program
dnl that contains a configuration script generated by Autoconf, under
dnl the same distribution terms as the rest of that program.
dnl From Bruno Haible, Marcus Daniels, Sam Steingold.
AC_PREREQ(2.57)
AC_DEFUN([CL_MMAP],
[AC_REQUIRE([CL_OPENFLAGS])dnl
[AC_BEFORE([$0], [CL_MUNMAP])AC_BEFORE([$0], [CL_MPROTECT])
AC_DEFINE([HAVE_MMAP],[],[have <sys/mmap.h> and the mmap() function])
AC_DEFINE(HAVE_MMAP,,[have <sys/mmap.h> and the mmap() function])
AC_CACHE_CHECK(for working mmap, cl_cv_func_mmap_works, [
case "$host" in
i[34567]86-*-sysv4*)
# UNIX_SYSV_UHC_1
avoid=0x08000000 ;;
mips-sgi-irix* | mips-dec-ultrix*)
# UNIX_IRIX, UNIX_DEC_ULTRIX
avoid=0x10000000 ;;
rs6000-ibm-aix*)
# UNIX_AIX
avoid=0x20000000 ;;
*)
avoid=0 ;;
esac
mmap_prog_1='
#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 () {
'
mmap_prog_2="#define bits_to_avoid $avoid"'
#define my_shift 24
#define my_low 1
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#define x(i) *(unsigned char *) ((i<<my_shift) + (i*i))
#define y(i) (unsigned char)((3*i-4)*(7*i+3))
for (i=my_low; i<=my_high; i++) if (i_ok(i)) { x(i) = y(i); }
for (i=my_high; i>=my_low; i--) if (i_ok(i)) { if (x(i) != y(i)) exit(1); }
exit(0);
}}
'
AC_TRY_RUN(GL_NOCRASH[$mmap_prog_1
AC_TRY_RUN([$mmap_prog_1
int flags = MAP_ANON | MAP_PRIVATE;
int fd = -1;
nocrash_init();
cl_cv_func_mmap_anon=yes, ,
cl_cv_func_mmap_anon=yes, rm -f core,
: # When cross-compiling, don't assume anything.
)
AC_TRY_RUN(GL_NOCRASH[$mmap_prog_1
AC_TRY_RUN([$mmap_prog_1
int flags = MAP_ANONYMOUS | MAP_PRIVATE;
int fd = -1;
nocrash_init();
cl_cv_func_mmap_anonymous=yes, ,
cl_cv_func_mmap_anonymous=yes, rm -f core,
: # When cross-compiling, don't assume anything.
)
AC_TRY_RUN(GL_NOCRASH[$mmap_prog_1
AC_TRY_RUN([$mmap_prog_1
#ifndef MAP_FILE
#define MAP_FILE 0
#endif
int flags = MAP_FILE | MAP_PRIVATE;
int fd = open("/dev/zero",O_RDONLY,0666);
if (fd<0) exit(1);
nocrash_init();
cl_cv_func_mmap_devzero=yes,
cl_cv_func_mmap_devzero=yes, rm -f core
retry_mmap=1,
: # When cross-compiling, don't assume anything.
)
if test -n "$retry_mmap"; then
AC_TRY_RUN(GL_NOCRASH[#define FOR_SUN4_29
AC_TRY_RUN([#define FOR_SUN4_29
$mmap_prog_1
#ifndef MAP_FILE
#define MAP_FILE 0
#endif
int flags = MAP_FILE | MAP_PRIVATE;
int fd = open("/dev/zero",O_RDONLY,0666);
if (fd<0) exit(1);
nocrash_init();
cl_cv_func_mmap_devzero_sun4_29=yes, ,
cl_cv_func_mmap_devzero_sun4_29=yes, rm -f core,
: # When cross-compiling, don't assume anything.
)
fi
if test -n "$have_mmap_anon" -o -n "$have_mmap_devzero"; then
cl_cv_func_mmap_works=yes
else
cl_cv_func_mmap_works=no
fi
])
if test "$cl_cv_func_mmap_anon" = yes; then
AC_DEFINE([HAVE_MMAP_ANON],[],[<sys/mman.h> defines MAP_ANON and mmaping with MAP_ANON works])
AC_DEFINE(HAVE_MMAP_ANON,,[<sys/mman.h> defines MAP_ANON and mmaping with MAP_ANON works])
fi
if test "$cl_cv_func_mmap_anonymous" = yes; then
AC_DEFINE([HAVE_MMAP_ANONYMOUS],[],[<sys/mman.h> defines MAP_ANONYMOUS and mmaping with MAP_ANONYMOUS works])
AC_DEFINE(HAVE_MMAP_ANONYMOUS,,[<sys/mman.h> defines MAP_ANONYMOUS and mmaping with MAP_ANONYMOUS works])
fi
if test "$cl_cv_func_mmap_devzero" = yes; then
AC_DEFINE([HAVE_MMAP_DEVZERO],[],[mmaping of the special device /dev/zero works])
AC_DEFINE(HAVE_MMAP_DEVZERO,,[mmaping of the special device /dev/zero works])
fi
if test "$cl_cv_func_mmap_devzero_sun4_29" = yes; then
AC_DEFINE([HAVE_MMAP_DEVZERO_SUN4_29],[],[mmaping of the special device /dev/zero works, but only on addresses < 2^29])
AC_DEFINE(HAVE_MMAP_DEVZERO_SUN4_29,,[mmaping of the special device /dev/zero works, but only on addresses < 2^29])
fi
fi
fi
])
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