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Diffstat (limited to 'gnulib-m4/fcntl_h.m4')
-rw-r--r--gnulib-m4/fcntl_h.m496
1 files changed, 96 insertions, 0 deletions
diff --git a/gnulib-m4/fcntl_h.m4 b/gnulib-m4/fcntl_h.m4
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index 00000000..1ae0b15a
--- /dev/null
+++ b/gnulib-m4/fcntl_h.m4
@@ -0,0 +1,96 @@
+# Configure fcntl.h.
+dnl Copyright (C) 2006, 2007, 2009 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 Written by Paul Eggert.
+
+AC_DEFUN([gl_FCNTL_H],
+[
+ AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
+ dnl Persuade glibc <fcntl.h> to define O_NOATIME and O_NOFOLLOW.
+ AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+ 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>
+ #include <fcntl.h>
+ #ifndef O_NOATIME
+ #define O_NOATIME 0
+ #endif
+ #ifndef O_NOFOLLOW
+ #define O_NOFOLLOW 0
+ #endif
+ static int const constants[] =
+ {
+ O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND,
+ O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY
+ };
+ ]],
+ [[
+ int status = !constants;
+ {
+ static char const sym[] = "conftest.sym";
+ if (symlink (".", sym) != 0
+ || close (open (sym, O_RDONLY | O_NOFOLLOW)) == 0)
+ status |= 32;
+ }
+ {
+ static char const file[] = "confdefs.h";
+ int fd = open (file, O_RDONLY | O_NOATIME);
+ char c;
+ struct stat st0, st1;
+ if (fd < 0
+ || fstat (fd, &st0) != 0
+ || sleep (1) != 0
+ || read (fd, &c, 1) != 1
+ || close (fd) != 0
+ || stat (file, &st1) != 0
+ || st0.st_atime != st1.st_atime)
+ status |= 64;
+ }
+ return status;]])],
+ [gl_cv_header_working_fcntl_h=yes],
+ [case $? in #(
+ 32) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #(
+ 64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #(
+ 96) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #(
+ *) gl_cv_header_working_fcntl_h='no';;
+ esac],
+ [gl_cv_header_working_fcntl_h=cross-compiling])])
+
+ case $gl_cv_header_working_fcntl_h in #(
+ *O_NOATIME* | no | cross-compiling) ac_val=0;; #(
+ *) ac_val=1;;
+ esac
+ AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOATIME], [$ac_val],
+ [Define to 1 if O_NOATIME works.])
+
+ case $gl_cv_header_working_fcntl_h in #(
+ *O_NOFOLLOW* | no | cross-compiling) ac_val=0;; #(
+ *) ac_val=1;;
+ esac
+ AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOFOLLOW], [$ac_val],
+ [Define to 1 if O_NOFOLLOW works.])
+
+ gl_CHECK_NEXT_HEADERS([fcntl.h])
+ FCNTL_H='fcntl.h'
+ AC_SUBST([FCNTL_H])
+])
+
+AC_DEFUN([gl_FCNTL_MODULE_INDICATOR],
+[
+ dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
+ AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
+ GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
+])
+
+AC_DEFUN([gl_FCNTL_H_DEFAULTS],
+[
+ GNULIB_OPEN=0; AC_SUBST([GNULIB_OPEN])
+ dnl Assume proper GNU behavior unless another module says otherwise.
+ REPLACE_OPEN=0; AC_SUBST([REPLACE_OPEN])
+])