diff options
Diffstat (limited to 'lib/autoconf/functions.m4')
-rw-r--r-- | lib/autoconf/functions.m4 | 41 |
1 files changed, 36 insertions, 5 deletions
diff --git a/lib/autoconf/functions.m4 b/lib/autoconf/functions.m4 index 5a0f0185..3d6e4aca 100644 --- a/lib/autoconf/functions.m4 +++ b/lib/autoconf/functions.m4 @@ -1283,7 +1283,6 @@ AU_ALIAS([AM_FUNC_MKTIME], [AC_FUNC_MKTIME]) AN_FUNCTION([mmap], [AC_FUNC_MMAP]) AC_DEFUN([AC_FUNC_MMAP], [AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles -dnl FIXME: Remove the unnecessary checks for unistd.h, sys/param.h, getpagesize. AC_CHECK_HEADERS_ONCE([unistd.h sys/param.h]) AC_CHECK_FUNCS_ONCE([getpagesize]) AC_CACHE_CHECK([for working mmap], [ac_cv_func_mmap_fixed_mapped], @@ -1311,17 +1310,49 @@ AC_CACHE_CHECK([for working mmap], [ac_cv_func_mmap_fixed_mapped], #include <fcntl.h> #include <sys/mman.h> +#ifndef getpagesize +# ifdef _SC_PAGESIZE +# define getpagesize() sysconf (_SC_PAGESIZE) +# elif defined _SC_PAGE_SIZE +# define getpagesize() sysconf (_SC_PAGE_SIZE) +# elif HAVE_GETPAGESIZE +int getpagesize (); +# else +# 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 +#endif + int main (void) { char *data, *data2, *data3; const char *cdata2; - int i, pagesize; + long i, pagesize; int fd, fd2; - /* The "page size" need not equal the system page size, - and need not even be a power of 2. */ - pagesize = 8192; + pagesize = getpagesize (); /* First, make a file with some known garbage in it. */ data = (char *) malloc (pagesize); |