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45 lines
1.5 KiB
Plaintext
45 lines
1.5 KiB
Plaintext
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# ioctl.m4 serial 5
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dnl Copyright (C) 2008-2019 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_IOCTL],
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[
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AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])
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AC_REQUIRE([gl_HEADER_SYS_SOCKET])
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HAVE_IOCTL=1
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if test "$ac_cv_header_winsock2_h" = yes; then
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dnl Even if the 'socket' module is not used here, another part of the
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dnl application may use it and pass file descriptors that refer to
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dnl sockets to the ioctl() function. So enable the support for sockets.
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HAVE_IOCTL=0
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else
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AC_CHECK_FUNCS([ioctl])
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dnl On glibc systems, the second parameter is 'unsigned long int request',
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dnl not 'int request'. We cannot simply cast the function pointer, but
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dnl instead need a wrapper.
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AC_CACHE_CHECK([for ioctl with POSIX signature],
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[gl_cv_func_ioctl_posix_signature],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <sys/ioctl.h>
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/* On some platforms, ioctl() is declared in <unistd.h>. */
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#include <unistd.h>
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]],
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[[extern
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#ifdef __cplusplus
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"C"
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#endif
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int ioctl (int, int, ...);
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]])
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],
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[gl_cv_func_ioctl_posix_signature=yes],
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[gl_cv_func_ioctl_posix_signature=no])
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])
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if test $gl_cv_func_ioctl_posix_signature != yes; then
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REPLACE_IOCTL=1
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fi
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fi
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])
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