+
+extern int getosreldate(void);
+
+char *
+os_get_runtime_executable_path()
+{
+ 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)
+char *
+os_get_runtime_executable_path()
+{
+ struct stat sb;
+ char *path = strdup("/proc/curproc/file");
+ if (path && ((stat(path, &sb)) == 0))
+ return path;
+ else {
+ fprintf(stderr, "Couldn't stat /proc/curproc/file; is /proc mounted?\n");
+ return NULL;
+ }