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46 lines
1.3 KiB
Plaintext
46 lines
1.3 KiB
Plaintext
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# dup.m4 serial 4
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dnl Copyright (C) 2011-2016 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_DUP],
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[
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AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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AC_REQUIRE([gl_MSVC_INVAL])
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if test $HAVE_MSVC_INVALID_PARAMETER_HANDLER = 1; then
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REPLACE_DUP=1
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fi
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dnl Replace dup() for supporting the gnulib-defined fchdir() function,
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dnl to keep fchdir's bookkeeping up-to-date.
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m4_ifdef([gl_FUNC_FCHDIR], [
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gl_TEST_FCHDIR
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if test $HAVE_FCHDIR = 0; then
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REPLACE_DUP=1
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fi
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])
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AC_CACHE_CHECK([whether dup works], [gl_cv_func_dup_works],
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM([[#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>]],
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[[/* On OS/2 kLIBC, dup does not work on a directory fd. */
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int fd = open (".", O_RDONLY);
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return fd < 0 ? 1 : dup (fd) < 0 ? 2 : 0;
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]])
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],
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[gl_cv_func_dup_works=yes],
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[gl_cv_func_dup_works=no],
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[gl_cv_func_dup_works='guessing yes'])
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])
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case "$gl_cv_func_dup_works" in
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*yes) ;;
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*)
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REPLACE_DUP=1
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;;
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esac
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])
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# Prerequisites of lib/dup.c.
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AC_DEFUN([gl_PREREQ_DUP], [:])
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