diff options
Diffstat (limited to 'm4/fcntl-o.m4')
| -rw-r--r-- | m4/fcntl-o.m4 | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/m4/fcntl-o.m4 b/m4/fcntl-o.m4 index 88db07e..87cc4bd 100644 --- a/m4/fcntl-o.m4 +++ b/m4/fcntl-o.m4 @@ -1,5 +1,5 @@ -# fcntl-o.m4 serial 3 -dnl Copyright (C) 2006, 2009-2011 Free Software Foundation, Inc. +# fcntl-o.m4 serial 4 +dnl Copyright (C) 2006, 2009-2013 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. @@ -17,12 +17,21 @@ AC_DEFUN([gl_FCNTL_O_FLAGS], m4_ifdef([AC_USE_SYSTEM_EXTENSIONS], [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])], [AC_REQUIRE([AC_GNU_SOURCE])]) + + AC_CHECK_HEADERS_ONCE([unistd.h]) + AC_CHECK_FUNCS_ONCE([symlink]) AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h], [AC_RUN_IFELSE( [AC_LANG_PROGRAM( [[#include <sys/types.h> #include <sys/stat.h> - #include <unistd.h> + #if HAVE_UNISTD_H + # include <unistd.h> + #else /* on Windows with MSVC */ + # include <io.h> + # include <stdlib.h> + # defined sleep(n) _sleep ((n) * 1000) + #endif #include <fcntl.h> #ifndef O_NOATIME #define O_NOATIME 0 @@ -38,9 +47,21 @@ AC_DEFUN([gl_FCNTL_O_FLAGS], ]], [[ int result = !constants; + #if HAVE_SYMLINK { static char const sym[] = "conftest.sym"; - if (symlink (".", sym) != 0) + if (symlink ("/dev/null", sym) != 0) + result |= 2; + else + { + int fd = open (sym, O_WRONLY | O_NOFOLLOW | O_CREAT, 0); + if (fd >= 0) + { + close (fd); + result |= 4; + } + } + if (unlink (sym) != 0 || symlink (".", sym) != 0) result |= 2; else { @@ -53,6 +74,7 @@ AC_DEFUN([gl_FCNTL_O_FLAGS], } unlink (sym); } + #endif { static char const file[] = "confdefs.h"; int fd = open (file, O_RDONLY | O_NOATIME); |