Refs Tokutek/ft-index#28 Use prctl (on any linux) even if it is too old for PR_SET_PTRACER.

Ignore any error caused by this

cmake_modules/TokuFeatureDetection.cmake

@@ -62,6 +62,7 @@ check_symbol_exists(O_DIRECT "fcntl.h" HAVE_O_DIRECT)
 check_symbol_exists(F_NOCACHE "fcntl.h" HAVE_F_NOCACHE)
 check_symbol_exists(MAP_ANONYMOUS "sys/mman.h" HAVE_MAP_ANONYMOUS)
 check_symbol_exists(PR_SET_PTRACER "sys/prctl.h" HAVE_PR_SET_PTRACER)
+check_symbol_exists(PR_SET_PTRACER_ANY "sys/prctl.h" HAVE_PR_SET_PTRACER_ANY)
 
 include(CheckFunctionExists)
 

portability/toku_crash.cc

@@ -127,7 +127,7 @@ run_gdb(pid_t parent_pid, const char *gdb_path) {
 static void
 intermediate_process(pid_t parent_pid, const char *gdb_path) {
     // Disable generating of core dumps
-#if defined(HAVE_SYS_PRCTL_H) && defined(HAVE_PR_SET_PTRACER)
+#if defined(HAVE_SYS_PRCTL_H)
     prctl(PR_SET_DUMPABLE, 0, 0, 0);
 #endif
     pid_t worker_pid = fork();
@@ -180,7 +180,7 @@ intermediate_process(pid_t parent_pid, const char *gdb_path) {
 static void
 spawn_gdb(const char *gdb_path) {
     pid_t parent_pid = getpid();
-#if defined(HAVE_SYS_PRCTL_H) && defined(HAVE_PR_SET_PTRACER)
+#if defined(HAVE_SYS_PRCTL_H)
     // On systems that require permission for the same user to ptrace,
     // give permission for this process and (more importantly) all its children to debug this process.
     prctl(PR_SET_PTRACER, parent_pid, 0, 0, 0);

toku_include/toku_portability.h

@@ -208,6 +208,19 @@ typedef int64_t toku_off_t;
 
 #endif
 
+// Define some constants for Yama in case the build-machine's software is too old.
+#if !defined(HAVE_PR_SET_PTRACER)
+/*
+ * Set specific pid that is allowed to ptrace the current task.
+ * A value of 0 mean "no process".
+ */
+// Well defined ("Yama" in ascii)
+#define PR_SET_PTRACER 0x59616d61
+#endif
+#if !defined(HAVE_PR_SET_PTRACER_ANY)
+#define PR_SET_PTRACER_ANY ((unsigned long)-1)
+#endif
+
 #if defined(__cplusplus)
 // decltype() here gives a reference-to-pointer instead of just a pointer,
 // just use __typeof__