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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2017 Red Hat Inc.
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
// essentially the same as ceph's PrCtl.h, copied into the dmclock library
#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
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