| # dup3.m4 serial 5 |
| dnl Copyright (C) 2009-2020 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([dup3 setdtablesize]) |
| if test $ac_cv_func_dup3 != yes; then |
| HAVE_DUP3=0 |
| 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 ]) |
| ]) |
