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-rw-r--r--m4/ioctl.m444
1 files changed, 44 insertions, 0 deletions
diff --git a/m4/ioctl.m4 b/m4/ioctl.m4
new file mode 100644
index 0000000..7c72134
--- /dev/null
+++ b/m4/ioctl.m4
@@ -0,0 +1,44 @@
+# ioctl.m4 serial 6
+dnl Copyright (C) 2008-2022 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_SYS_SOCKET_H])
+ 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
+])