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# dup3.m4 serial 7
dnl Copyright (C) 2009-2023 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_DUP3],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
dnl Persuade glibc <unistd.h> to declare dup3().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_CHECK_FUNCS_ONCE([setdtablesize])
gl_CHECK_FUNCS_ANDROID([dup3], [[#include <unistd.h>]])
if test $ac_cv_func_dup3 != yes; then
HAVE_DUP3=0
case "$gl_cv_onwards_func_dup3" in
future*) REPLACE_DUP3=1 ;;
esac
else
REPLACE_DUP3=1
fi
dnl Not needed yet, because dup3 is unconditionally replaced.
dnl dnl Replace dup3() for supporting the gnulib-defined fchdir() function,
dnl dnl to keep fchdir's bookkeeping up-to-date.
dnl m4_ifdef([gl_FUNC_FCHDIR], [
dnl gl_TEST_FCHDIR
dnl if test $HAVE_FCHDIR = 0; then
dnl if test $HAVE_DUP3 = 1; then
dnl REPLACE_DUP3=1
dnl fi
dnl fi
dnl ])
])
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