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# sys_random_h.m4 serial 8
dnl Copyright (C) 2020-2021 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_ONCE([gl_SYS_RANDOM_H],
[
AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
dnl <sys/random.h> is always overridden, because of GNULIB_POSIXCHECK.
gl_CHECK_NEXT_HEADERS([sys/random.h])
if test $ac_cv_header_sys_random_h = yes; then
HAVE_SYS_RANDOM_H=1
else
HAVE_SYS_RANDOM_H=0
fi
AC_SUBST([HAVE_SYS_RANDOM_H])
m4_ifdef([gl_UNISTD_H_DEFAULTS], [AC_REQUIRE([gl_UNISTD_H_DEFAULTS])])
if test $ac_cv_header_sys_random_h = yes; then
UNISTD_H_HAVE_SYS_RANDOM_H=1
fi
dnl Check for declarations of anything we want to poison if the
dnl corresponding gnulib module is not in use.
gl_WARN_ON_USE_PREPARE([[
#if HAVE_SYS_RANDOM_H
/* Additional includes are needed before <sys/random.h> on uClibc
and Mac OS X. */
# include <sys/types.h>
# include <stdlib.h>
# include <sys/random.h>
#endif
]],
[getrandom])
])
# gl_SYS_RANDOM_MODULE_INDICATOR([modulename])
# sets the shell variable that indicates the presence of the given module
# to a C preprocessor expression that will evaluate to 1.
# This macro invocation must not occur in macros that are AC_REQUIREd.
AC_DEFUN([gl_SYS_RANDOM_MODULE_INDICATOR],
[
dnl Ensure to expand the default settings once only.
gl_SYS_RANDOM_H_REQUIRE_DEFAULTS
gl_MODULE_INDICATOR_SET_VARIABLE([$1])
dnl Define it also as a C macro, for the benefit of the unit tests.
gl_MODULE_INDICATOR_FOR_TESTS([$1])
])
# Initializes the default values for AC_SUBSTed shell variables.
# This macro must not be AC_REQUIREd. It must only be invoked, and only
# outside of macros or in macros that are not AC_REQUIREd.
AC_DEFUN([gl_SYS_RANDOM_H_REQUIRE_DEFAULTS],
[
m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_RANDOM_H_MODULE_INDICATOR_DEFAULTS], [
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETRANDOM])
])
m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_RANDOM_H_MODULE_INDICATOR_DEFAULTS])
AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
])
AC_DEFUN([gl_SYS_RANDOM_H_DEFAULTS],
[
dnl Assume proper GNU behavior unless another module says otherwise.
HAVE_GETRANDOM=1; AC_SUBST([HAVE_GETRANDOM])
REPLACE_GETRANDOM=0; AC_SUBST([REPLACE_GETRANDOM])
])
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