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dnl Check for mmap()
dnl AC_FUNC_MMAP checks for private fixed mappings, we don't need
dnl fixed mappings, so check only wether private mappings work.
dnl AC_FUNC_MMAP would fail on HP-UX for example.
AC_DEFUN([AC_C_FUNC_MMAP_PRIVATE],
[
AC_CACHE_CHECK([for working mmap], [ac_cv_c_mmap_private],
[
AC_RUN_IFELSE([AC_LANG_SOURCE([
#include <unistd.h>
#include <stdlib.h>
#include <sys/mman.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#include <fcntl.h>
int main(void)
{
char *data, *data2, *data3;
unsigned i, datasize = 1024;
int fd;
/* First, make a file with some known garbage in it. */
data = (char*) malloc(datasize);
if(!data)
return 1;
for(i=0;i<datasize;i++)
*(data + i) = rand();
umask(0);
fd = creat("conftest.mmap", 0600);
if(fd < 0)
return 1;
if(write (fd, data, datasize) != datasize)
return 1;
close(fd);
fd = open("conftest.mmap", O_RDWR);
if (fd < 0)
return 1;
/* 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. */
data2 = mmap(NULL, sizeof(data), PROT_READ | PROT_WRITE,
MAP_PRIVATE, fd, 0L);
if(data2 == MAP_FAILED)
return 2;
for(i=0;i<sizeof(data);i++)
if(*(data + i) != *(data2+ i))
return 3;
/* 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 < datasize; ++i)
*(data2 + i) = *(data2 + i) + 1;
data3 = (char*) malloc(datasize);
if(!data3)
return 1;
if(read (fd, data3, datasize) != datasize)
return 1;
for(i=0;i<sizeof(data);i++)
if(*(data + i) != *(data3 + i))
return 3;
close(fd);
return 0;
}])],
[ac_cv_c_mmap_private=yes],
[ac_cv_c_mmap_private=no],
[ac_cv_c_mmap_private=no])])
if test $ac_cv_c_mmap_private = yes; then
AC_DEFINE(HAVE_MMAP, 1,
[Define to 1 if you have a working `mmap' system call that supports MAP_PRIVATE.])
fi
rm -f conftest.mmap
])
AC_DEFUN([AC_C_FUNC_MMAP_ANONYMOUS],
[
AC_CACHE_CHECK([for MAP_ANON(YMOUS)], [ac_cv_c_mmap_anonymous],[
ac_cv_c_mmap_anonymous='no'
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[#include <sys/mman.h>]], [[mmap((void *)0, 0, PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);]])],
[ac_cv_c_mmap_anonymous='MAP_ANONYMOUS'],
[
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[
/* OPENBSD WORKAROUND - DND*/
#include <sys/types.h>
/* OPENBSD WORKAROUND - END*/
#include <sys/mman.h>
]], [[mmap((void *)0, 0, PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);]])],
[ac_cv_c_mmap_anonymous='MAP_ANON']
)
]
)
])
if test "$ac_cv_c_mmap_anonymous" != "no"; then
AC_DEFINE_UNQUOTED([ANONYMOUS_MAP],[$ac_cv_c_mmap_anonymous],[mmap flag for anonymous maps])
fi
])
AC_DEFUN([AC_C_FUNC_PAGESIZE],
[
ac_cv_c_can_get_pagesize="no"
AC_CACHE_CHECK([for sysconf(_SC_PAGESIZE)], [ac_cv_c_sysconf_sc_pagesize], [
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <sys/types.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif]], [[int x = sysconf(_SC_PAGESIZE);]])],
[ac_cv_c_sysconf_sc_pagesize=yes], [ac_cv_c_sysconf_sc_pagesize=no])
])
if test "$ac_cv_c_sysconf_sc_pagesize" = "yes"; then
AC_DEFINE([HAVE_SYSCONF_SC_PAGESIZE], 1, [Define to 1 if sysconf(_SC_PAGESIZE) is available])
ac_cv_c_can_get_pagesize="yes"
fi
AC_CACHE_CHECK([for getpagesize()], [ac_cv_c_getpagesize], [
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#if HAVE_UNISTD_H
#include <unistd.h>
#endif]], [[int x = getpagesize();]])],
[ac_cv_c_getpagesize=yes], [ac_cv_c_getpagesize=no])
])
if test "$ac_cv_c_getpagesize" = "yes"; then
AC_DEFINE([HAVE_GETPAGESIZE], 1, [Define to 1 if getpagesize() is available])
ac_cv_c_can_get_pagesize="yes"
fi
])
|