--- /dev/null
+// essentially the same as ceph's PrCtl.h, copied into the dmclock library
+
+#include <dmtest-config.h>
+#ifdef HAVE_SYS_PRCTL_H
+#include <iostream>
+#include <sys/prctl.h>
+#include <errno.h>
+
+struct PrCtl {
+ int saved_state = -1;
+ int set_dumpable(int new_state) {
+ int r = prctl(PR_SET_DUMPABLE, new_state);
+ if (r) {
+ r = -errno;
+ std::cerr << "warning: unable to " << (new_state ? "set" : "unset")
+ << " dumpable flag: " << strerror(r)
+ << std::endl;
+ }
+ return r;
+ }
+ PrCtl(int new_state = 0) {
+ int r = prctl(PR_GET_DUMPABLE);
+ if (r == -1) {
+ r = errno;
+ std::cerr << "warning: unable to get dumpable flag: " << strerror(r)
+ << std::endl;
+ } else if (r != new_state) {
+ if (!set_dumpable(new_state)) {
+ saved_state = r;
+ }
+ }
+ }
+ ~PrCtl() {
+ if (saved_state < 0) {
+ return;
+ }
+ set_dumpable(saved_state);
+ }
+};
+#else
+struct PrCtl {};
+#endif