+ if (!(major_version>2 || minor_version >= 4)) {
+#ifdef LISP_FEATURE_SPARC
+ FSHOW((stderr,"linux kernel %d.%d predates 2.4;\n enabling workarounds for SPARC kernel bugs in signal handling.\n", major_version,minor_version));
+ linux_sparc_siginfo_bug = 1;
+#endif
+ }
+#ifdef LISP_FEATURE_SB_THREAD
+ futex_wait(futex,-1);
+ if(errno==ENOSYS) {
+ lose("This version of sbcl is compiled with threading support, but your kernel is too old to support this.\n\
+Please use a more recent kernel or a version of sbcl without threading support.\n");
+ }
+ if(! isnptl()) {
+ lose("This version of sbcl only works correctly with the NPTL threading library. Please use a newer glibc, older sbcl or stop using LD_ASSUME_KERNEL");
+ }
+#endif
+ os_vm_page_size = getpagesize();
+
+ /* KLUDGE: Disable memory randomization on new Linux kernels
+ * by setting a personality flag and re-executing. (We need
+ * to re-execute, since the memory maps that can conflict with
+ * the SBCL spaces have already been done at this point).
+ */
+#if defined(LISP_FEATURE_X86)
+ if ((major_version == 2 && minor_version >= 6)
+ || major_version >= 3)
+ {
+ long pers = personality(-1);
+ /* 0x40000 aka. ADDR_NO_RANDOMIZE */
+ if (!(pers & 0x40000)) {
+ if (personality(pers | 0x40000) != -1) {
+ /* Use /proc/self/exe instead of trying to figure out the
+ * executable path from PATH and argv[0], since that's
+ * unreliable. We follow the symlink instead of executing
+ * the file directly to avoid top from displaying the
+ * name of the process as "exe".
+ */
+ char runtime[PATH_MAX+1];
+ int i = readlink("/proc/self/exe", runtime, PATH_MAX);
+ if (i != -1) {
+ runtime[i] = '\0';
+ execve(runtime, argv, envp);
+ }
+ }
+ /* Either changing the personality or execve() failed. Either
+ * way we might as well continue, and hope that the random
+ * memory maps are ok this time around.
+ */
+ fprintf(stderr, "WARNING: Couldn't re-execute SBCL with the proper personality flags (maybe /proc isn't mounted?). Trying to continue anyway.\n");
+ }
+ }
+#endif