3 dnl Copyright (C) 2020-2024 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
8 AC_DEFUN_ONCE([gl_SYS_RANDOM_H],
10 AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
11 dnl <sys/random.h> is always overridden, because of GNULIB_POSIXCHECK.
12 gl_CHECK_NEXT_HEADERS([sys/random.h])
13 if test $ac_cv_header_sys_random_h = yes; then
18 AC_SUBST([HAVE_SYS_RANDOM_H])
20 m4_ifdef([gl_UNISTD_H_DEFAULTS], [AC_REQUIRE([gl_UNISTD_H_DEFAULTS])])
21 if test $ac_cv_header_sys_random_h = yes; then
22 UNISTD_H_HAVE_SYS_RANDOM_H=1
25 dnl Check for declarations of anything we want to poison if the
26 dnl corresponding gnulib module is not in use.
27 gl_WARN_ON_USE_PREPARE([[
29 /* Additional includes are needed before <sys/random.h> on uClibc
31 # include <sys/types.h>
33 # include <sys/random.h>
39 # gl_SYS_RANDOM_MODULE_INDICATOR([modulename])
40 # sets the shell variable that indicates the presence of the given module
41 # to a C preprocessor expression that will evaluate to 1.
42 # This macro invocation must not occur in macros that are AC_REQUIREd.
43 AC_DEFUN([gl_SYS_RANDOM_MODULE_INDICATOR],
45 dnl Ensure to expand the default settings once only.
46 gl_SYS_RANDOM_H_REQUIRE_DEFAULTS
47 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
48 dnl Define it also as a C macro, for the benefit of the unit tests.
49 gl_MODULE_INDICATOR_FOR_TESTS([$1])
52 # Initializes the default values for AC_SUBSTed shell variables.
53 # This macro must not be AC_REQUIREd. It must only be invoked, and only
54 # outside of macros or in macros that are not AC_REQUIREd.
55 AC_DEFUN([gl_SYS_RANDOM_H_REQUIRE_DEFAULTS],
57 m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_RANDOM_H_MODULE_INDICATOR_DEFAULTS], [
58 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETRANDOM])
60 m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_RANDOM_H_MODULE_INDICATOR_DEFAULTS])
61 AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
64 AC_DEFUN([gl_SYS_RANDOM_H_DEFAULTS],
66 dnl Assume proper GNU behavior unless another module says otherwise.
67 HAVE_GETRANDOM=1; AC_SUBST([HAVE_GETRANDOM])
68 REPLACE_GETRANDOM=0; AC_SUBST([REPLACE_GETRANDOM])