X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fprocess.c;h=680d3179297e3bfbdf5032a87d54992391f57d3d;hb=d917c8cb6b69475d568ccbe82389b9f2b3eb5e80;hp=babdf43653de17636a30e82de4768f41812b5345;hpb=62a7fa9a7bfd1cd1592fd7c381ea28aac0ed7936;p=tinc

diff --git a/src/process.c b/src/process.c
index babdf436..680d3179 100644
--- a/src/process.c
+++ b/src/process.c
@@ -1,7 +1,7 @@
 /*
     process.c -- process management functions
-    Copyright (C) 1999-2003 Ivo Timmermans <ivo@o2w.nl>,
-                  2000-2003 Guus Sliepen <guus@sliepen.eu.org>
+    Copyright (C) 1999-2005 Ivo Timmermans,
+                  2000-2011 Guus Sliepen <guus@tinc-vpn.org>
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -13,22 +13,21 @@
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
 
-    You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-    $Id: process.c,v 1.1.2.63 2003/08/03 21:45:13 guus Exp $
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
 #include "system.h"
 
 #include "conf.h"
 #include "connection.h"
+#include "control.h"
 #include "device.h"
 #include "edge.h"
 #include "logger.h"
+#include "net.h"
 #include "node.h"
-#include "pidfile.h"
 #include "process.h"
 #include "subnet.h"
 #include "utils.h"
@@ -36,41 +35,14 @@
 
 /* If zero, don't detach from the terminal. */
 bool do_detach = true;
-bool sighup = false;
 bool sigalrm = false;
 
 extern char *identname;
-extern char *pidfilename;
 extern char **g_argv;
 extern bool use_logfile;
-extern volatile bool running;
-
-sigset_t emptysigset;
-
-static int saved_debug_level = -1;
-
-static void memory_full(int size)
-{
-	logger(LOG_ERR, _("Memory exhausted (couldn't allocate %d bytes), exitting."), size);
-	cp_trace();
-	exit(1);
-}
 
 /* Some functions the less gifted operating systems might lack... */
 
-#ifndef HAVE_FCLOSEALL
-static int fcloseall(void)
-{
-	fflush(stdin);
-	fflush(stdout);
-	fflush(stderr);
-	fclose(stdin);
-	fclose(stdout);
-	fclose(stderr);
-	return 0;
-}
-#endif
-
 #ifdef HAVE_MINGW
 extern char *identname;
 extern char *program_name;
@@ -81,127 +53,117 @@ static SC_HANDLE service = NULL;
 static SERVICE_STATUS status = {0};
 static SERVICE_STATUS_HANDLE statushandle = 0;
 
-bool install_service(void) {
-	char command[4096] = "";
-	char **argp;
+static bool install_service(void) {
+	char command[4096] = "\"";
+	SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
 
 	manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
 	if(!manager) {
-		logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError()));
+		logger(DEBUG_ALWAYS, LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
 		return false;
 	}
 
 	if(!strchr(program_name, '\\')) {
-		GetCurrentDirectory(sizeof(command), command);
-		strncat(command, "\\", sizeof(command));
+		GetCurrentDirectory(sizeof command - 1, command + 1);
+		strncat(command, "\\", sizeof command - strlen(command));
 	}
 
-	strncat(command, program_name, sizeof(command));
-	for(argp = g_argv + 1; *argp; argp++) {
-		strncat(command, " ", sizeof(command));
-		strncat(command, *argp, sizeof(command));
-	}
+	strncat(command, program_name, sizeof command - strlen(command));
 
-	service = CreateService(manager, identname, identname,
-			SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
-			command, "NDIS", NULL, NULL, NULL, NULL);
-	
-	if(!service) {
-		logger(LOG_ERR, _("Could not create %s service: %s"), identname, winerror(GetLastError()));
-		return false;
-	}
+	strncat(command, "\"", sizeof command - strlen(command));
 
-	logger(LOG_INFO, _("%s service installed"), identname);
+	for(char **argp = g_argv + 1; *argp; argp++) {
+		char &space = strchr(*argp, ' ');
+		strncat(command, " ", sizeof command - strlen(command));
 
-	if(!StartService(service, 0, NULL))
-		logger(LOG_WARNING, _("Could not start %s service: %s"), identname, winerror(GetLastError()));
-	else
-		logger(LOG_INFO, _("%s service started"), identname);
+		if(space)
+			strncat(command, "\"", sizeof command - strlen(command));
 
-	return true;
-}
+		strncat(command, *argp, sizeof command - strlen(command));
 
-bool remove_service(void) {
-	manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
-	if(!manager) {
-		logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError()));
-		return false;
+		if(space)
+			strncat(command, "\"", sizeof command - strlen(command));
 	}
 
-	service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
+	service = CreateService(manager, identname, identname,
+			SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
+			command, NULL, NULL, NULL, NULL, NULL);
 
 	if(!service) {
-		logger(LOG_ERR, _("Could not open %s service: %s"), identname, winerror(GetLastError()));
-		return false;
+		DWORD lasterror = GetLastError();
+		logger(DEBUG_ALWAYS, LOG_ERR, "Could not create %s service: %s", identname, winerror(lasterror));
+		if(lasterror != ERROR_SERVICE_EXISTS)
+			return false;
 	}
 
-	if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
-		logger(LOG_ERR, _("Could not stop %s service: %s"), identname, winerror(GetLastError()));
-	else
-		logger(LOG_INFO, _("%s service stopped"), identname);
-
-	if(!DeleteService(service)) {
-		logger(LOG_ERR, _("Could not remove %s service: %s"), identname, winerror(GetLastError()));
-		return false;
+	if(service) {
+		ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
+		logger(DEBUG_ALWAYS, LOG_INFO, "%s service installed", identname);
+	} else {
+		service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 	}
 
-	logger(LOG_INFO, _("%s service removed"), identname);
+	if(!StartService(service, 0, NULL))
+		logger(DEBUG_ALWAYS, LOG_WARNING, "Could not start %s service: %s", identname, winerror(GetLastError()));
+	else
+		logger(DEBUG_ALWAYS, LOG_INFO, "%s service started", identname);
 
 	return true;
 }
 
 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
 	switch(request) {
+		case SERVICE_CONTROL_INTERROGATE:
+			SetServiceStatus(statushandle, &status);
+			return NO_ERROR;
 		case SERVICE_CONTROL_STOP:
-			logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_STOP");
-			running = false;
+			logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
 			break;
 		case SERVICE_CONTROL_SHUTDOWN:
-			logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_SHUTDOWN");
-			running = false;
+			logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
 			break;
 		default:
-			logger(LOG_WARNING, _("Got unexpected request %d"), request);
+			logger(DEBUG_ALWAYS, LOG_WARNING, "Got unexpected request %d", request);
 			return ERROR_CALL_NOT_IMPLEMENTED;
 	}
 
-	if(!running) {
-		status.dwCurrentState = SERVICE_STOP_PENDING; 
-		SetServiceStatus(statushandle, &status);
-	}
-
+	event_loopexit(NULL);
+	status.dwWaitHint = 30000;
+	status.dwCurrentState = SERVICE_STOP_PENDING;
+	SetServiceStatus(statushandle, &status);
 	return NO_ERROR;
 }
 
-VOID WINAPI run_service(DWORD argc, LPTSTR* argv)
-{
+VOID WINAPI run_service(DWORD argc, LPTSTR* argv) {
 	int err = 1;
 	extern int main2(int argc, char **argv);
 
 
-	status.dwServiceType = SERVICE_WIN32; 
+	status.dwServiceType = SERVICE_WIN32;
 	status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
-	status.dwWin32ExitCode = 0; 
-	status.dwServiceSpecificExitCode = 0; 
-	status.dwCheckPoint = 0; 
-	status.dwWaitHint = 0; 
+	status.dwWin32ExitCode = 0;
+	status.dwServiceSpecificExitCode = 0;
+	status.dwCheckPoint = 0;
 
-	statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL); 
+	statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 
 	if (!statushandle) {
-		logger(LOG_ERR, _("System call `%s' failed: %s"), "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
+		logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 		err = 1;
 	} else {
-		status.dwCurrentState = SERVICE_START_PENDING; 
+		status.dwWaitHint = 30000;
+		status.dwCurrentState = SERVICE_START_PENDING;
 		SetServiceStatus(statushandle, &status);
 
+		status.dwWaitHint = 0;
 		status.dwCurrentState = SERVICE_RUNNING;
 		SetServiceStatus(statushandle, &status);
 
 		err = main2(argc, argv);
 
-		status.dwCurrentState = SERVICE_STOPPED; 
-		//status.dwWin32ExitCode = err; 
+		status.dwWaitHint = 0;
+		status.dwCurrentState = SERVICE_STOPPED;
+		//status.dwWin32ExitCode = err;
 		SetServiceStatus(statushandle, &status);
 	}
 
@@ -219,99 +181,22 @@ bool init_service(void) {
 			return false;
 		}
 		else
-			logger(LOG_ERR, _("System call `%s' failed: %s"), "StartServiceCtrlDispatcher", winerror(GetLastError()));
+			logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
 	}
 
 	return true;
 }
 #endif
 
-#ifndef HAVE_MINGW
 /*
-  check for an existing tinc for this net, and write pid to pidfile
+  Detach from current terminal
 */
-static bool write_pidfile(void)
-{
-	int pid;
-
-	cp();
-
-	pid = check_pid(pidfilename);
-
-	if(pid) {
-		if(netname)
-			fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
-					netname, pid);
-		else
-			fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
-		return false;
-	}
-
-	/* if it's locked, write-protected, or whatever */
-	if(!write_pid(pidfilename))
-		return false;
-
-	return true;
-}
-#endif
-
-/*
-  kill older tincd for this net
-*/
-bool kill_other(int signal)
-{
-#ifndef HAVE_MINGW
-	int pid;
-
-	cp();
-
-	pid = read_pid(pidfilename);
-
-	if(!pid) {
-		if(netname)
-			fprintf(stderr, _("No other tincd is running for net `%s'.\n"),
-					netname);
-		else
-			fprintf(stderr, _("No other tincd is running.\n"));
-		return false;
-	}
-
-	errno = 0;					/* No error, sometimes errno is only changed on error */
-
-	/* ESRCH is returned when no process with that pid is found */
-	if(kill(pid, signal) && errno == ESRCH) {
-		if(netname)
-			fprintf(stderr, _("The tincd for net `%s' is no longer running. "),
-					netname);
-		else
-			fprintf(stderr, _("The tincd is no longer running. "));
-
-		fprintf(stderr, _("Removing stale lock file.\n"));
-		remove_pid(pidfilename);
-	}
-
-	return true;
-#else
-	return remove_service();
-#endif
-}
-
-/*
-  Detach from current terminal, write pidfile, kill parent
-*/
-bool detach(void)
-{
-	cp();
-
-	setup_signals();
-
-	/* First check if we can open a fresh new pidfile */
-
+bool detach(void) {
 #ifndef HAVE_MINGW
-	if(!write_pidfile())
-		return false;
-
-	/* If we succeeded in doing that, detach */
+	signal(SIGPIPE, SIG_IGN);
+	signal(SIGUSR1, SIG_IGN);
+	signal(SIGUSR2, SIG_IGN);
+	signal(SIGWINCH, SIG_IGN);
 
 	closelogger();
 #endif
@@ -319,296 +204,90 @@ bool detach(void)
 	if(do_detach) {
 #ifndef HAVE_MINGW
 		if(daemon(0, 0)) {
-			fprintf(stderr, _("Couldn't detach from terminal: %s"),
+			fprintf(stderr, "Couldn't detach from terminal: %s",
 					strerror(errno));
 			return false;
 		}
-
-		/* Now UPDATE the pid in the pidfile, because we changed it... */
-
-		if(!write_pid(pidfilename))
-			return false;
 #else
 		if(!statushandle)
-			exit(install_service());
+			exit(!install_service());
 #endif
 	}
 
 	openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
 
-	logger(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
+	logger(DEBUG_ALWAYS, LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
 			   VERSION, __DATE__, __TIME__, debug_level);
 
-	xalloc_fail_func = memory_full;
-
 	return true;
 }
 
-#ifdef HAVE_FORK
-/*
-  Execute the program name, with sane environment.
-*/
-static void _execute_script(const char *scriptname, char **envp)
-	__attribute__ ((__noreturn__));
-static void _execute_script(const char *scriptname, char **envp)
-{
-	int save_errno;
-
-	cp();
-
-	while(*envp)
-		putenv(*envp++);
-
-	chdir("/");
-
-	closelogger();
-
-	/* Close all file descriptors */
-	fcloseall();
-
-	execl(scriptname, scriptname, NULL);
-	/* No return on success */
-
-	save_errno = errno;
-
-	openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
-	logger(LOG_ERR, _("Could not execute `%s': %s"), scriptname,
-		   strerror(save_errno));
-	exit(save_errno);
-}
-#endif
-
-/*
-  Fork and execute the program pointed to by name.
-*/
-bool execute_script(const char *name, char **envp)
-{
-#ifdef HAVE_FORK
-	pid_t pid;
-	int status;
-	struct stat s;
+bool execute_script(const char *name, char **envp) {
+#ifdef HAVE_SYSTEM
 	char *scriptname;
+	char *command;
 
-	cp();
-
-	asprintf(&scriptname, "%s/%s", confbase, name);
+	xasprintf(&scriptname, "%s" SLASH "%s%s", confbase, name, scriptextension);
 
 	/* First check if there is a script */
 
-	if(stat(scriptname, &s))
-		return true;
-
-	pid = fork();
-
-	if(pid < 0) {
-		logger(LOG_ERR, _("System call `%s' failed: %s"), "fork",
-			   strerror(errno));
-		return false;
-	}
-
-	if(pid) {
-		ifdebug(STATUS) logger(LOG_INFO, _("Executing script %s"), name);
-
+	if(access(scriptname, F_OK)) {
 		free(scriptname);
-
-		if(waitpid(pid, &status, 0) == pid) {
-			if(WIFEXITED(status)) {	/* Child exited by itself */
-				if(WEXITSTATUS(status)) {
-					logger(LOG_ERR, _("Process %d (%s) exited with non-zero status %d"),
-						   pid, name, WEXITSTATUS(status));
-					return false;
-				} else
-					return true;
-			} else if(WIFSIGNALED(status)) {	/* Child was killed by a signal */
-				logger(LOG_ERR, _("Process %d (%s) was killed by signal %d (%s)"), pid,
-					   name, WTERMSIG(status), strsignal(WTERMSIG(status)));
-				return false;
-			} else {			/* Something strange happened */
-				logger(LOG_ERR, _("Process %d (%s) terminated abnormally"), pid,
-					   name);
-				return false;
-			}
-		} else if (errno != EINTR) {
-			logger(LOG_ERR, _("System call `%s' failed: %s"), "waitpid",
-				   strerror(errno));
-			return false;
-		}
-
-		/* Why do we get EINTR? */
 		return true;
 	}
 
-	/* Child here */
+	logger(DEBUG_STATUS, LOG_INFO, "Executing script %s", name);
 
-	_execute_script(scriptname, envp);
-#else
-	return true;
-#endif
-}
-
-
-/*
-  Signal handlers.
-*/
-
-#ifndef HAVE_MINGW
-static RETSIGTYPE sigterm_handler(int a)
-{
-	logger(LOG_NOTICE, _("Got %s signal"), "TERM");
-	running = false;
-}
+#ifdef HAVE_PUTENV
+	/* Set environment */
 
-static RETSIGTYPE sigquit_handler(int a)
-{
-	logger(LOG_NOTICE, _("Got %s signal"), "QUIT");
-	running = false;
-}
+	for(int i = 0; envp[i]; i++)
+		putenv(envp[i]);
+#endif
 
-static RETSIGTYPE fatal_signal_square(int a)
-{
-	logger(LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a,
-		   strsignal(a));
-	cp_trace();
-	exit(1);
-}
+	if(scriptinterpreter)
+		xasprintf(&command, "%s \"%s\"", scriptinterpreter, scriptname);
+	else
+		xasprintf(&command, "\"%s\"", scriptname);
 
-static RETSIGTYPE fatal_signal_handler(int a)
-{
-	struct sigaction act;
-	logger(LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a));
-	cp_trace();
+	int status = system(command);
 
-	if(do_detach) {
-		logger(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
+	free(command);
+	free(scriptname);
 
-		act.sa_handler = fatal_signal_square;
-		act.sa_mask = emptysigset;
-		act.sa_flags = 0;
-		sigaction(SIGSEGV, &act, NULL);
+	/* Unset environment */
 
-		close_network_connections();
-		sleep(5);
-		remove_pid(pidfilename);
-		execvp(g_argv[0], g_argv);
-	} else {
-		logger(LOG_NOTICE, _("Not restarting."));
-		exit(1);
+	for(int i = 0; envp[i]; i++) {
+		char *e = strchr(envp[i], '=');
+		if(e) {
+			char p[e - envp[i] + 1];
+			strncpy(p, envp[i], e - envp[i]);
+			p[e - envp[i]] = '\0';
+			putenv(p);
+		}
 	}
-}
-
-static RETSIGTYPE sighup_handler(int a)
-{
-	logger(LOG_NOTICE, _("Got %s signal"), "HUP");
-	sighup = true;
-}
-
-static RETSIGTYPE sigint_handler(int a)
-{
-	logger(LOG_NOTICE, _("Got %s signal"), "INT");
 
-	if(saved_debug_level != -1) {
-		logger(LOG_NOTICE, _("Reverting to old debug level (%d)"),
-			saved_debug_level);
-		debug_level = saved_debug_level;
-		saved_debug_level = -1;
+#ifdef WEXITSTATUS
+	if(status != -1) {
+		if(WIFEXITED(status)) {          /* Child exited by itself */
+			if(WEXITSTATUS(status)) {
+				logger(DEBUG_ALWAYS, LOG_ERR, "Script %s exited with non-zero status %d",
+					   name, WEXITSTATUS(status));
+				return false;
+			}
+		} else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
+			logger(DEBUG_ALWAYS, LOG_ERR, "Script %s was killed by signal %d (%s)",
+				   name, WTERMSIG(status), strsignal(WTERMSIG(status)));
+			return false;
+		} else {                         /* Something strange happened */
+			logger(DEBUG_ALWAYS, LOG_ERR, "Script %s terminated abnormally", name);
+			return false;
+		}
 	} else {
-		logger(LOG_NOTICE,
-			_("Temporarily setting debug level to 5.  Kill me with SIGINT again to go back to level %d."),
-			debug_level);
-		saved_debug_level = debug_level;
-		debug_level = 5;
+		logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "system", strerror(errno));
+		return false;
 	}
-}
-
-static RETSIGTYPE sigalrm_handler(int a)
-{
-	logger(LOG_NOTICE, _("Got %s signal"), "ALRM");
-	sigalrm = true;
-}
-
-static RETSIGTYPE sigusr1_handler(int a)
-{
-	dump_connections();
-}
-
-static RETSIGTYPE sigusr2_handler(int a)
-{
-	dump_device_stats();
-	dump_nodes();
-	dump_edges();
-	dump_subnets();
-}
-
-static RETSIGTYPE sigwinch_handler(int a)
-{
-	do_purge = true;
-}
-
-static RETSIGTYPE unexpected_signal_handler(int a)
-{
-	logger(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
-	cp_trace();
-}
-
-static RETSIGTYPE ignore_signal_handler(int a)
-{
-	ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
-}
-
-static struct {
-	int signal;
-	void (*handler)(int);
-} sighandlers[] = {
-	{SIGHUP, sighup_handler},
-	{SIGTERM, sigterm_handler},
-	{SIGQUIT, sigquit_handler},
-	{SIGSEGV, fatal_signal_handler},
-	{SIGBUS, fatal_signal_handler},
-	{SIGILL, fatal_signal_handler},
-	{SIGPIPE, ignore_signal_handler},
-	{SIGINT, sigint_handler},
-	{SIGUSR1, sigusr1_handler},
-	{SIGUSR2, sigusr2_handler},
-	{SIGCHLD, ignore_signal_handler},
-	{SIGALRM, sigalrm_handler},
-	{SIGWINCH, sigwinch_handler},
-	{0, NULL}
-};
 #endif
-
-void setup_signals(void)
-{
-#ifndef HAVE_MINGW
-	int i;
-	struct sigaction act;
-
-	sigemptyset(&emptysigset);
-	act.sa_handler = NULL;
-	act.sa_mask = emptysigset;
-	act.sa_flags = 0;
-
-	/* Set a default signal handler for every signal, errors will be
-	   ignored. */
-	for(i = 0; i < NSIG; i++) {
-		if(!do_detach)
-			act.sa_handler = SIG_DFL;
-		else
-			act.sa_handler = unexpected_signal_handler;
-		sigaction(i, &act, NULL);
-	}
-
-	/* If we didn't detach, allow coredumps */
-	if(!do_detach)
-		sighandlers[3].handler = SIG_DFL;
-
-	/* Then, for each known signal that we want to catch, assign a
-	   handler to the signal, with error checking this time. */
-	for(i = 0; sighandlers[i].signal; i++) {
-		act.sa_handler = sighandlers[i].handler;
-		if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
-			fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
-					sighandlers[i].signal, strsignal(sighandlers[i].signal),
-					strerror(errno));
-	}
 #endif
+	return true;
 }