+#ifdef LISP_FEATURE_DARWIN
+/* defined in ppc-darwin-os.c instead */
+#elif defined(LISP_FEATURE_FREEBSD)
+#ifndef KERN_PROC_PATHNAME
+#define KERN_PROC_PATHNAME 12
+#endif
+
+char *
+os_get_runtime_executable_path(int external)
+{
+ char path[PATH_MAX + 1];
+
+ if (getosreldate() >= 600024) {
+ /* KERN_PROC_PATHNAME is available */
+ size_t len = PATH_MAX + 1;
+ int mib[4];
+
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_PROC;
+ mib[2] = KERN_PROC_PATHNAME;
+ mib[3] = -1;
+ if (sysctl(mib, 4, &path, &len, NULL, 0) != 0)
+ return NULL;
+ } else {
+ int size;
+ size = readlink("/proc/curproc/file", path, sizeof(path) - 1);
+ if (size < 0)
+ return NULL;
+ path[size] = '\0';
+ }
+ if (strcmp(path, "unknown") == 0)
+ return NULL;
+ return copied_string(path);
+}
+#elif defined(LISP_FEATURE_NETBSD) || defined(LISP_FEATURE_OPENBSD)
+char *
+os_get_runtime_executable_path(int external)
+{
+ struct stat sb;
+ if (!external && stat("/proc/curproc/file", &sb) == 0)
+ return copied_string("/proc/curproc/file");
+ return NULL;
+}
+#else /* Not DARWIN or FREEBSD or NETBSD or OPENBSD */
+char *
+os_get_runtime_executable_path(int external)
+{
+ return NULL;
+}
+#endif
+
+#ifdef __OpenBSD__
+
+int openbsd_use_fxsave = 0;
+
+void
+openbsd_init()
+{
+#ifdef LISP_FEATURE_X86
+ int mib[2];
+ size_t size;
+#endif
+ /*
+ * Show a warning if it looks like the memory available after
+ * allocating the spaces won't be at least this much.
+ */
+#ifdef LISP_FEATURE_X86_64
+ const int wantfree = 64 * 1024 * 1024;