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159 lines
3.6 KiB
C++
159 lines
3.6 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2012, 2013 Ripple Labs Inc.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#include <ripple/basics/safe_cast.h>
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#include <ripple/basics/Sustain.h>
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#include <ripple/beast/core/CurrentThreadName.h>
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#include <boost/format.hpp>
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// For Sustain Linux variants
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// VFALCO TODO Rewrite Sustain to use beast::Process
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#ifdef __linux__
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#include <sys/types.h>
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#include <sys/prctl.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#endif
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#ifdef __FreeBSD__
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#include <sys/types.h>
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#include <sys/wait.h>
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#endif
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namespace ripple {
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#ifdef __unix__
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static auto const sleepBeforeWaiting = 10;
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static auto const sleepBetweenWaits = 1;
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static pid_t pManager = safe_cast<pid_t> (0);
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static pid_t pChild = safe_cast<pid_t> (0);
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static void pass_signal (int a)
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{
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kill (pChild, a);
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}
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static void stop_manager (int)
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{
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kill (pChild, SIGINT);
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_exit (0);
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}
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bool HaveSustain ()
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{
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return true;
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}
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std::string StopSustain ()
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{
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if (getppid () != pManager)
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return "";
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kill (pManager, SIGHUP);
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return "Terminating monitor";
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}
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static
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bool checkChild(pid_t pid, int options)
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{
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int i;
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if (waitpid (pChild, &i, options) == -1)
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return false;
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return kill (pChild, 0) == 0;
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}
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std::string DoSustain ()
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{
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pManager = getpid ();
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signal (SIGINT, stop_manager);
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signal (SIGHUP, stop_manager);
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signal (SIGUSR1, pass_signal);
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signal (SIGUSR2, pass_signal);
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// Number of times the child has exited in less than
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// 15 seconds.
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int fastExit = 0;
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for (auto childCount = 1; ; ++childCount)
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{
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pChild = fork ();
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if (pChild == -1)
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_exit (0);
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auto cc = std::to_string (childCount);
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if (pChild == 0)
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{
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beast::setCurrentThreadName ("rippled: main");
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signal (SIGINT, SIG_DFL);
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signal (SIGHUP, SIG_DFL);
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signal (SIGUSR1, SIG_DFL);
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signal (SIGUSR2, SIG_DFL);
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return "Launching child " + cc;
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}
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beast::setCurrentThreadName (("rippled: #" + cc).c_str());
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sleep (sleepBeforeWaiting);
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// If the child has already terminated count this
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// as a fast exit and an indication that something
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// went wrong:
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if (!checkChild (pChild, WNOHANG))
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{
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if (++fastExit == 5)
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_exit (0);
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}
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else
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{
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fastExit = 0;
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while (checkChild (pChild, 0))
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sleep(sleepBetweenWaits);
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(void)rename ("core",
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("core." + std::to_string(pChild)).c_str());
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}
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}
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}
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#else
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bool HaveSustain ()
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{
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return false;
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}
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std::string DoSustain ()
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{
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return "";
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}
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std::string StopSustain ()
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{
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return "";
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}
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#endif
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} // ripple
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