1# ioctl.m4 serial 4 2dnl Copyright (C) 2008-2014 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7AC_DEFUN([gl_FUNC_IOCTL], 8[ 9 AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS]) 10 AC_REQUIRE([gl_HEADER_SYS_SOCKET]) 11 HAVE_IOCTL=1 12 if test "$ac_cv_header_winsock2_h" = yes; then 13 dnl Even if the 'socket' module is not used here, another part of the 14 dnl application may use it and pass file descriptors that refer to 15 dnl sockets to the ioctl() function. So enable the support for sockets. 16 HAVE_IOCTL=0 17 else 18 AC_CHECK_FUNCS([ioctl]) 19 dnl On glibc systems, the second parameter is 'unsigned long int request', 20 dnl not 'int request'. We cannot simply cast the function pointer, but 21 dnl instead need a wrapper. 22 AC_CACHE_CHECK([for ioctl with POSIX signature], 23 [gl_cv_func_ioctl_posix_signature], 24 [AC_COMPILE_IFELSE( 25 [AC_LANG_PROGRAM( 26 [[#include <sys/ioctl.h>]], 27 [[extern 28 #ifdef __cplusplus 29 "C" 30 #endif 31 int ioctl (int, int, ...); 32 ]]) 33 ], 34 [gl_cv_func_ioctl_posix_signature=yes], 35 [gl_cv_func_ioctl_posix_signature=no]) 36 ]) 37 if test $gl_cv_func_ioctl_posix_signature != yes; then 38 REPLACE_IOCTL=1 39 fi 40 fi 41]) 42