1 files changed, 68 insertions, 0 deletions
diff --git a/gl/m4/sys_random_h.m4 b/gl/m4/sys_random_h.m4
new file mode 100644
index 0000000..a5ba85c
--- /dev/null
+++ b/gl/m4/sys_random_h.m4
@@ -0,0 +1,68 @@
+# sys_random_h.m4 serial 8
+dnl Copyright (C) 2020-2022 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_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])
+])