restructure build to separate the 3 main components into 3 subdirectories

libi2pd for core libs

libi2pd_client for i2pd client libs

daemon for i2pd daemon libs

daemon/UnixDaemon.cpp

@@ -0,0 +1,197 @@
+#include "Daemon.h"
+
+#ifndef _WIN32
+
+#include <signal.h>
+#include <stdlib.h>
+#include <thread>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/resource.h>
+
+#include "Config.h"
+#include "FS.h"
+#include "Log.h"
+#include "RouterContext.h"
+#include "ClientContext.h"
+
+void handle_signal(int sig)
+{
+	switch (sig)
+	{
+		case SIGHUP:
+			LogPrint(eLogInfo, "Daemon: Got SIGHUP, reopening tunnel configuration...");
+			i2p::client::context.ReloadConfig();
+		break;
+		case SIGUSR1:
+			LogPrint(eLogInfo, "Daemon: Got SIGUSR1, reopening logs...");
+			i2p::log::Logger().Reopen ();
+		break;
+		case SIGINT:
+			if (i2p::context.AcceptsTunnels () && !Daemon.gracefulShutdownInterval)
+			{
+				i2p::context.SetAcceptsTunnels (false);
+				Daemon.gracefulShutdownInterval = 10*60; // 10 minutes
+				LogPrint(eLogInfo, "Graceful shutdown after ", Daemon.gracefulShutdownInterval, " seconds");
+			}
+			else
+				Daemon.running = 0;
+		break;
+		case SIGABRT:
+		case SIGTERM:
+			Daemon.running = 0; // Exit loop
+		break;
+		case SIGPIPE:
+			LogPrint(eLogInfo, "SIGPIPE received");
+		break;
+	}
+}
+
+namespace i2p
+{
+	namespace util
+	{
+		bool DaemonLinux::start()
+		{
+			if (isDaemon)
+			{
+				pid_t pid;
+				pid = fork();
+				if (pid > 0) // parent
+					::exit (EXIT_SUCCESS);
+
+				if (pid < 0) // error
+				{
+					LogPrint(eLogError, "Daemon: could not fork: ", strerror(errno));
+					return false;
+				}
+
+				// child
+				umask(S_IWGRP | S_IRWXO); // 0027
+				int sid = setsid();
+				if (sid < 0)
+				{
+					LogPrint(eLogError, "Daemon: could not create process group.");
+					return false;
+				}
+				std::string d = i2p::fs::GetDataDir();
+				if (chdir(d.c_str()) != 0)
+				{
+					LogPrint(eLogError, "Daemon: could not chdir: ", strerror(errno));
+					return false;
+				}
+
+				// point std{in,out,err} descriptors to /dev/null
+				freopen("/dev/null", "r", stdin);
+				freopen("/dev/null", "w", stdout);
+				freopen("/dev/null", "w", stderr);
+			}
+
+			// set proc limits
+			struct rlimit limit;
+			uint16_t nfiles; i2p::config::GetOption("limits.openfiles", nfiles);
+			getrlimit(RLIMIT_NOFILE, &limit);
+			if (nfiles == 0) {
+				LogPrint(eLogInfo, "Daemon: using system limit in ", limit.rlim_cur, " max open files");
+			} else if (nfiles <= limit.rlim_max) {
+				limit.rlim_cur = nfiles;
+				if (setrlimit(RLIMIT_NOFILE, &limit) == 0) {
+					LogPrint(eLogInfo, "Daemon: set max number of open files to ",
+						nfiles, " (system limit is ", limit.rlim_max, ")");
+				} else {
+					LogPrint(eLogError, "Daemon: can't set max number of open files: ", strerror(errno));
+				}
+			} else {
+				LogPrint(eLogError, "Daemon: limits.openfiles exceeds system limit: ", limit.rlim_max);
+			}
+			uint32_t cfsize; i2p::config::GetOption("limits.coresize", cfsize);
+			if (cfsize) // core file size set
+			{
+				cfsize *= 1024;
+				getrlimit(RLIMIT_CORE, &limit);
+				if (cfsize <= limit.rlim_max) {
+					limit.rlim_cur = cfsize;
+					if (setrlimit(RLIMIT_CORE, &limit) != 0) {
+						LogPrint(eLogError, "Daemon: can't set max size of coredump: ", strerror(errno));
+					} else if (cfsize == 0) {
+						LogPrint(eLogInfo, "Daemon: coredumps disabled");
+					} else {
+						LogPrint(eLogInfo, "Daemon: set max size of core files to ", cfsize / 1024, "Kb");
+					}
+				} else {
+					LogPrint(eLogError, "Daemon: limits.coresize exceeds system limit: ", limit.rlim_max);
+				}
+			}
+
+			// Pidfile
+			// this code is c-styled and a bit ugly, but we need fd for locking pidfile
+			std::string pidfile; i2p::config::GetOption("pidfile", pidfile);
+			if (pidfile == "") {
+				pidfile = i2p::fs::DataDirPath("i2pd.pid");
+			}
+			if (pidfile != "") {
+				pidFH = open(pidfile.c_str(), O_RDWR | O_CREAT, 0600);
+				if (pidFH < 0)
+				{
+					LogPrint(eLogError, "Daemon: could not create pid file ", pidfile, ": ", strerror(errno));
+					return false;
+				}
+				if (lockf(pidFH, F_TLOCK, 0) != 0)
+				{
+					LogPrint(eLogError, "Daemon: could not lock pid file ", pidfile, ": ", strerror(errno));
+					return false;
+				}
+				char pid[10];
+				sprintf(pid, "%d\n", getpid());
+				ftruncate(pidFH, 0);
+				if (write(pidFH, pid, strlen(pid)) < 0)
+				{
+					LogPrint(eLogError, "Daemon: could not write pidfile: ", strerror(errno));
+					return false;
+				}
+			}
+			gracefulShutdownInterval = 0; // not specified
+
+			// Signal handler
+			struct sigaction sa;
+			sa.sa_handler = handle_signal;
+			sigemptyset(&sa.sa_mask);
+			sa.sa_flags = SA_RESTART;
+			sigaction(SIGHUP, &sa, 0);
+			sigaction(SIGUSR1, &sa, 0);
+			sigaction(SIGABRT, &sa, 0);
+			sigaction(SIGTERM, &sa, 0);
+			sigaction(SIGINT, &sa, 0);
+			sigaction(SIGPIPE, &sa, 0);			
+
+			return Daemon_Singleton::start();
+		}
+
+		bool DaemonLinux::stop()
+		{
+			i2p::fs::Remove(pidfile);
+
+			return Daemon_Singleton::stop();
+		}
+
+		void DaemonLinux::run ()
+		{
+			while (running)
+			{
+				std::this_thread::sleep_for (std::chrono::seconds(1));
+				if (gracefulShutdownInterval)
+				{
+					gracefulShutdownInterval--; // - 1 second
+					if (gracefulShutdownInterval <= 0)
+					{
+						LogPrint(eLogInfo, "Graceful shutdown");
+						return;
+					}
+				}
+			}
+		}
+	}
+}
+
+#endif