Mercurial > gnulib
view m4/ioctl.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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# ioctl.m4 serial 5 dnl Copyright (C) 2008-2019 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_IOCTL], [ AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS]) AC_REQUIRE([gl_HEADER_SYS_SOCKET]) HAVE_IOCTL=1 if test "$ac_cv_header_winsock2_h" = yes; then dnl Even if the 'socket' module is not used here, another part of the dnl application may use it and pass file descriptors that refer to dnl sockets to the ioctl() function. So enable the support for sockets. HAVE_IOCTL=0 else AC_CHECK_FUNCS([ioctl]) dnl On glibc systems, the second parameter is 'unsigned long int request', dnl not 'int request'. We cannot simply cast the function pointer, but dnl instead need a wrapper. AC_CACHE_CHECK([for ioctl with POSIX signature], [gl_cv_func_ioctl_posix_signature], [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [[#include <sys/ioctl.h> /* On some platforms, ioctl() is declared in <unistd.h>. */ #include <unistd.h> ]], [[extern #ifdef __cplusplus "C" #endif int ioctl (int, int, ...); ]]) ], [gl_cv_func_ioctl_posix_signature=yes], [gl_cv_func_ioctl_posix_signature=no]) ]) if test $gl_cv_func_ioctl_posix_signature != yes; then REPLACE_IOCTL=1 fi fi ])