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Diffstat (limited to 'libsigsegv/m4/mmap-anon.m4')
| -rw-r--r-- | libsigsegv/m4/mmap-anon.m4 | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/libsigsegv/m4/mmap-anon.m4 b/libsigsegv/m4/mmap-anon.m4 new file mode 100644 index 00000000..9f43ae67 --- /dev/null +++ b/libsigsegv/m4/mmap-anon.m4 @@ -0,0 +1,140 @@ +# mmap-anon.m4 serial 3 (libsigsegv-2.6) +dnl Copyright (C) 2002-2003, 2008 Bruno Haible <bruno@clisp.org> +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. + +# How to allocate fresh memory using mmap. +AC_DEFUN([SV_MMAP_ANON], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) + + dnl 1) MAP_ANON + + AC_CACHE_CHECK([for mmap with MAP_ANON], sv_cv_func_mmap_anon, [ + AC_RUN_IFELSE([ + AC_LANG_SOURCE([[ +#include <sys/types.h> +#include <sys/mman.h> +int main () +{ + void *p = mmap (0, 0x10000, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0); + return (p == (void *)(-1)); +}]])], + [sv_cv_func_mmap_anon=yes], + [sv_cv_func_mmap_anon=no], + [ + dnl FIXME: Put in some more known values here. + case "$host_os" in + freebsd* | linux* | osf* | darwin*) + sv_cv_func_mmap_anon=yes ;; + *) + AC_LINK_IFELSE([ + AC_LANG_PROGRAM([[ +#include <sys/types.h> +#include <sys/mman.h> +]], + [[mmap (0, 0x10000, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);]])], + [sv_cv_func_mmap_anon="guessing yes"], + [sv_cv_func_mmap_anon=no]) + ;; + esac + ]) + ]) + if test "$sv_cv_func_mmap_anon" != no; then + AC_DEFINE(HAVE_MMAP_ANON, 1, + [Define if <sys/mman.h> defines MAP_ANON and mmaping with MAP_ANON works.]) + fi + + dnl 2) MAP_ANONYMOUS + + AC_CACHE_CHECK([for mmap with MAP_ANONYMOUS], sv_cv_func_mmap_anonymous, [ + AC_RUN_IFELSE([ + AC_LANG_SOURCE([[ +#include <sys/types.h> +#include <sys/mman.h> +int main () +{ + void *p = mmap (0, 0x10000, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); + return (p == (void *)(-1)); +}]])], + [sv_cv_func_mmap_anonymous=yes], + [sv_cv_func_mmap_anonymous=no], + [ + dnl FIXME: Put in some more known values here. + case "$host_os" in + hpux* | linux* | osf*) + sv_cv_func_mmap_anonymous=yes ;; + darwin*) + sv_cv_func_mmap_anonymous=no ;; + *) + AC_LINK_IFELSE([ + AC_LANG_PROGRAM([[ +#include <sys/types.h> +#include <sys/mman.h> +]], + [[mmap (0, 0x10000, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);]])], + [sv_cv_func_mmap_anonymous="guessing yes"], + [sv_cv_func_mmap_anonymous=no]) + ;; + esac + ]) + ]) + if test "$sv_cv_func_mmap_anonymous" != no; then + AC_DEFINE(HAVE_MMAP_ANONYMOUS, 1, + [Define if <sys/mman.h> defines MAP_ANONYMOUS and mmaping with MAP_ANONYMOUS + works.]) + fi + + dnl 3) MAP_FILE of /dev/zero + + AC_CACHE_CHECK([for mmap of /dev/zero], sv_cv_func_mmap_devzero, [ + AC_RUN_IFELSE([ + AC_LANG_SOURCE([[ +#include <sys/types.h> +#include <sys/mman.h> +#include <fcntl.h> +#ifndef MAP_FILE +#define MAP_FILE 0 +#endif +int main () +{ + int fd; + void *p; + fd = open ("/dev/zero", O_RDONLY, 0666); + if (fd < 0) return 1; + p = mmap (0, 0x10000, PROT_READ | PROT_WRITE, MAP_FILE | MAP_PRIVATE, fd, 0); + return (p == (void *)(-1)); +}]])], + [sv_cv_func_mmap_devzero=yes], + [sv_cv_func_mmap_devzero=no], + [ + dnl FIXME: Put in some more known values here. + case "$host_os" in + freebsd* | irix* | linux* | osf* | solaris* | sunos4*) + sv_cv_func_mmap_devzero=yes ;; + darwin*) + sv_cv_func_mmap_devzero=no ;; + *) + AC_LINK_IFELSE([ + AC_LANG_PROGRAM([[ +#include <sys/types.h> +#include <sys/mman.h> +#ifndef MAP_FILE +#define MAP_FILE 0 +#endif +]], [[mmap (0, 0x10000, PROT_READ | PROT_WRITE, MAP_FILE | MAP_PRIVATE, 7, 0);]])], + [sv_cv_func_mmap_devzero="guessing yes"], + [sv_cv_func_mmap_devzero=no]) + ;; + esac + ]) + ]) + if test "$sv_cv_func_mmap_devzero" != no; then + AC_DEFINE(HAVE_MMAP_DEVZERO, 1, + [Define if mmaping of the special device /dev/zero works.]) + fi +]) |