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annotate m4/ioctl.m4 @ 40057:b06060465f09

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maint: Run 'make update-copyright'
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 01 Jan 2019 00:25:11 +0100
parents 10eb9086bea0
children
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1 # ioctl.m4 serial 5
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2 dnl Copyright (C) 2008-2019 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_FUNC_IOCTL],
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8 [
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9 AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])
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10 AC_REQUIRE([gl_HEADER_SYS_SOCKET])
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11 HAVE_IOCTL=1
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12 if test "$ac_cv_header_winsock2_h" = yes; then
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13 dnl Even if the 'socket' module is not used here, another part of the
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14 dnl application may use it and pass file descriptors that refer to
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15 dnl sockets to the ioctl() function. So enable the support for sockets.
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16 HAVE_IOCTL=0
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17 else
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18 AC_CHECK_FUNCS([ioctl])
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19 dnl On glibc systems, the second parameter is 'unsigned long int request',
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20 dnl not 'int request'. We cannot simply cast the function pointer, but
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21 dnl instead need a wrapper.
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22 AC_CACHE_CHECK([for ioctl with POSIX signature],
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23 [gl_cv_func_ioctl_posix_signature],
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24 [AC_COMPILE_IFELSE(
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25 [AC_LANG_PROGRAM(
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26 [[#include <sys/ioctl.h>
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27 /* On some platforms, ioctl() is declared in <unistd.h>. */
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28 #include <unistd.h>
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29 ]],
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30 [[extern
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31 #ifdef __cplusplus
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32 "C"
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33 #endif
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34 int ioctl (int, int, ...);
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35 ]])
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36 ],
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37 [gl_cv_func_ioctl_posix_signature=yes],
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38 [gl_cv_func_ioctl_posix_signature=no])
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39 ])
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40 if test $gl_cv_func_ioctl_posix_signature != yes; then
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41 REPLACE_IOCTL=1
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42 fi
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43 fi
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44 ])