| 1 | # ioctl.m4 serial 6
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| 2 | dnl Copyright (C) 2008-2021 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_SYS_SOCKET_H])
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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 | ])
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