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-rw-r--r--m4/open.m495
1 files changed, 95 insertions, 0 deletions
diff --git a/m4/open.m4 b/m4/open.m4
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+# open.m4 serial 15
+dnl Copyright (C) 2007-2019 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.
+
+AC_DEFUN([gl_FUNC_OPEN],
+[
+ AC_REQUIRE([AC_CANONICAL_HOST])
+ AC_REQUIRE([gl_PREPROC_O_CLOEXEC])
+ case "$host_os" in
+ mingw* | pw*)
+ REPLACE_OPEN=1
+ ;;
+ *)
+ dnl open("foo/") should not create a file when the file name has a
+ dnl trailing slash. FreeBSD only has the problem on symlinks.
+ AC_CHECK_FUNCS_ONCE([lstat])
+ if test "$gl_cv_macro_O_CLOEXEC" != yes; then
+ REPLACE_OPEN=1
+ fi
+ AC_CACHE_CHECK([whether open recognizes a trailing slash],
+ [gl_cv_func_open_slash],
+ [# Assume that if we have lstat, we can also check symlinks.
+ if test $ac_cv_func_lstat = yes; then
+ touch conftest.tmp
+ ln -s conftest.tmp conftest.lnk
+ fi
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#include <fcntl.h>
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+int main ()
+{
+ int result = 0;
+#if HAVE_LSTAT
+ if (open ("conftest.lnk/", O_RDONLY) != -1)
+ result |= 1;
+#endif
+ if (open ("conftest.sl/", O_CREAT, 0600) >= 0)
+ result |= 2;
+ return result;
+}]])],
+ [gl_cv_func_open_slash=yes],
+ [gl_cv_func_open_slash=no],
+ [
+changequote(,)dnl
+ case "$host_os" in
+ freebsd* | aix* | hpux* | solaris2.[0-9] | solaris2.[0-9].*)
+ gl_cv_func_open_slash="guessing no" ;;
+ *)
+ gl_cv_func_open_slash="guessing yes" ;;
+ esac
+changequote([,])dnl
+ ])
+ rm -f conftest.sl conftest.tmp conftest.lnk
+ ])
+ case "$gl_cv_func_open_slash" in
+ *no)
+ AC_DEFINE([OPEN_TRAILING_SLASH_BUG], [1],
+ [Define to 1 if open() fails to recognize a trailing slash.])
+ REPLACE_OPEN=1
+ ;;
+ esac
+ ;;
+ esac
+ dnl Replace open() for supporting the gnulib-defined fchdir() function,
+ dnl to keep fchdir's bookkeeping up-to-date.
+ m4_ifdef([gl_FUNC_FCHDIR], [
+ if test $REPLACE_OPEN = 0; then
+ gl_TEST_FCHDIR
+ if test $HAVE_FCHDIR = 0; then
+ REPLACE_OPEN=1
+ fi
+ fi
+ ])
+ dnl Replace open() for supporting the gnulib-defined O_NONBLOCK flag.
+ m4_ifdef([gl_NONBLOCKING_IO], [
+ if test $REPLACE_OPEN = 0; then
+ gl_NONBLOCKING_IO
+ if test $gl_cv_have_open_O_NONBLOCK != yes; then
+ REPLACE_OPEN=1
+ fi
+ fi
+ ])
+])
+
+# Prerequisites of lib/open.c.
+AC_DEFUN([gl_PREREQ_OPEN],
+[
+ AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])
+ :
+])