diff options
Diffstat (limited to 'gnulib-m4/mmap-anon.m4')
| -rw-r--r-- | gnulib-m4/mmap-anon.m4 | 22 |
1 files changed, 9 insertions, 13 deletions
diff --git a/gnulib-m4/mmap-anon.m4 b/gnulib-m4/mmap-anon.m4 index 61ca0120..abf6194a 100644 --- a/gnulib-m4/mmap-anon.m4 +++ b/gnulib-m4/mmap-anon.m4 @@ -1,18 +1,17 @@ # mmap-anon.m4 -# serial 12 -dnl Copyright (C) 2005, 2007, 2009-2024 Free Software Foundation, Inc. +# serial 15 +dnl Copyright (C) 2005, 2007, 2009-2025 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. +dnl This file is offered as-is, without any warranty. # Detect how mmap can be used to create anonymous (not file-backed) memory # mappings. -# - On Linux, AIX, OSF/1, Solaris, Cygwin, Interix, Haiku, both MAP_ANONYMOUS -# and MAP_ANON exist and have the same value. +# - On Linux, AIX, Solaris, Cygwin, Interix, Haiku, both MAP_ANONYMOUS and +# MAP_ANON exist and have the same value. # - On HP-UX, only MAP_ANONYMOUS exists. # - On Mac OS X, FreeBSD, NetBSD, OpenBSD, Minix, only MAP_ANON exists. -# - On IRIX, neither exists, and a file descriptor opened to /dev/zero must be -# used. AC_DEFUN_ONCE([gl_FUNC_MMAP_ANON], [ @@ -22,11 +21,13 @@ AC_DEFUN_ONCE([gl_FUNC_MMAP_ANON], # Check for mmap(). Don't use AC_FUNC_MMAP, because it checks too much: it # fails on HP-UX 11, because MAP_FIXED mappings do not work. But this is # irrelevant for anonymous mappings. - AC_CHECK_FUNC([mmap], [gl_have_mmap=yes], [gl_have_mmap=no]) + # Instead, assume that mmap() exists if and only if <sys/mman.h> exists. + # Code needs to tests HAVE_SYS_MMAN_H, not HAVE_MMAP. + AC_CHECK_HEADERS_ONCE([sys/mman.h]) # Try to allow MAP_ANONYMOUS. gl_have_mmap_anonymous=no - if test $gl_have_mmap = yes; then + if test $ac_cv_header_sys_mman_h = yes; then AC_MSG_CHECKING([for MAP_ANONYMOUS]) AC_EGREP_CPP([I cannot identify this map], [ #include <sys/mman.h> @@ -47,10 +48,5 @@ AC_DEFUN_ONCE([gl_FUNC_MMAP_ANON], gl_have_mmap_anonymous=yes]) fi AC_MSG_RESULT([$gl_have_mmap_anonymous]) - if test $gl_have_mmap_anonymous = yes; then - AC_DEFINE([HAVE_MAP_ANONYMOUS], [1], - [Define to 1 if mmap()'s MAP_ANONYMOUS flag is available after including - config.h and <sys/mman.h>.]) - fi fi ]) |