Mercurial > gnulib
view m4/dup3.m4 @ 40212:8da9577294da
unistr/*, uniconv/*: Fix undefined behaviour.
Reported by Jeffrey Walton <noloader@gmail.com>.
* lib/unistr/u-cpy.h (FUNC): Don't invoke memcpy with a zero size.
* lib/unistr/u-cpy-alloc.h (FUNC): Likewise.
* lib/uniconv/u8-conv-from-enc.c (u8_conv_from_encoding): Likewise.
* lib/uniconv/u8-conv-to-enc.c (u8_conv_to_encoding): Likewise.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sat, 09 Mar 2019 00:01:47 +0100 |
parents | b06060465f09 |
children |
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# dup3.m4 serial 5 dnl Copyright (C) 2009-2019 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_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 ]) ])