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-rw-r--r--m4/fdopendir.m467
1 files changed, 67 insertions, 0 deletions
diff --git a/m4/fdopendir.m4 b/m4/fdopendir.m4
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+++ b/m4/fdopendir.m4
@@ -0,0 +1,67 @@
+# serial 14
+# See if we need to provide fdopendir.
+
+dnl Copyright (C) 2009-2022 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.
+
+# Written by Eric Blake.
+
+AC_DEFUN([gl_FUNC_FDOPENDIR],
+[
+ AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
+ dnl FreeBSD 7.3 has the function, but failed to declare it.
+ AC_CHECK_DECLS([fdopendir], [], [HAVE_DECL_FDOPENDIR=0], [[
+#include <dirent.h>
+ ]])
+ AC_CHECK_FUNCS_ONCE([fdopendir])
+ if test $ac_cv_func_fdopendir = no; then
+ HAVE_FDOPENDIR=0
+ else
+ AC_CACHE_CHECK([whether fdopendir works],
+ [gl_cv_func_fdopendir_works],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM([[
+#include <dirent.h>
+#include <fcntl.h>
+#include <unistd.h>
+]GL_MDA_DEFINES[
+#if !HAVE_DECL_FDOPENDIR
+extern
+# ifdef __cplusplus
+"C"
+# endif
+DIR *fdopendir (int);
+#endif
+]],
+ [[int result = 0;
+ int fd = open ("conftest.c", O_RDONLY);
+ if (fd < 0) result |= 1;
+ if (fdopendir (fd)) result |= 2;
+ if (close (fd)) result |= 4;
+ return result;
+ ]])],
+ [gl_cv_func_fdopendir_works=yes],
+ [gl_cv_func_fdopendir_works=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_fdopendir_works="guessing yes" ;;
+ # Guess yes on musl systems.
+ *-musl*) gl_cv_func_fdopendir_works="guessing yes" ;;
+ # If we don't know, obey --enable-cross-guesses.
+ *) gl_cv_func_fdopendir_works="$gl_cross_guess_normal" ;;
+ esac
+ ])])
+ case "$gl_cv_func_fdopendir_works" in
+ *yes) ;;
+ *)
+ REPLACE_FDOPENDIR=1
+ ;;
+ esac
+ fi
+])