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app.cpp
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app.cpp
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/* SLiM - Simple Login Manager
Copyright (C) 1997, 1998 Per Liden
Copyright (C) 2004-06 Simone Rota <[email protected]>
Copyright (C) 2004-06 Johannes Winkelmann <[email protected]>
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
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <cstring>
#include <cstdio>
#include <iostream>
#include <fstream>
#include <sstream>
#include <vector>
#include <algorithm>
#include "app.h"
#include "numlock.h"
#ifdef HAVE_SHADOW
#include <shadow.h>
#endif
using namespace std;
#ifdef USE_PAM
#include <string>
int conv(int num_msg, const struct pam_message **msg,
struct pam_response **resp, void *appdata_ptr){
*resp = (struct pam_response *) calloc(num_msg, sizeof(struct pam_response));
Panel* panel = *static_cast<Panel**>(appdata_ptr);
int result = PAM_SUCCESS;
for (int i=0; i<num_msg; i++){
resp[i]->resp=0;
resp[i]->resp_retcode=0;
switch(msg[i]->msg_style){
case PAM_PROMPT_ECHO_ON:
// We assume PAM is asking for the username
panel->EventHandler(Panel::Get_Name);
switch(panel->getAction()){
case Panel::Suspend:
case Panel::Halt:
case Panel::Reboot:
resp[i]->resp=strdup("root");
break;
case Panel::Console:
case Panel::Exit:
case Panel::Login:
resp[i]->resp=strdup(panel->GetName().c_str());
break;
}
break;
case PAM_PROMPT_ECHO_OFF:
// We assume PAM is asking for the password
switch(panel->getAction()){
case Panel::Console:
case Panel::Exit:
// We should leave now!
result=PAM_CONV_ERR;
break;
default:
panel->EventHandler(Panel::Get_Passwd);
resp[i]->resp=strdup(panel->GetPasswd().c_str());
break;
}
break;
case PAM_ERROR_MSG:
case PAM_TEXT_INFO:
// We simply write these to the log
// TODO: Maybe we should simply ignore them
cerr << APPNAME << ": " << msg[i]->msg << endl;
break;
}
if (result!=PAM_SUCCESS) break;
}
if (result!=PAM_SUCCESS){
for (int i=0; i<num_msg; i++){
if (resp[i]->resp==0) continue;
free(resp[i]->resp);
resp[i]->resp=0;
};
free(*resp);
*resp=0;
};
return result;
}
#endif
extern App* LoginApp;
void CatchSignal(int sig) {
cerr << APPNAME << ": unexpected signal " << sig << endl;
LoginApp->StopServer();
LoginApp->RemoveLock();
exit(ERR_EXIT);
}
void AlarmSignal(int sig) {
int pid = LoginApp->GetServerPID();
if(waitpid(pid, NULL, WNOHANG) == pid) {
LoginApp->StopServer();
LoginApp->RemoveLock();
exit(OK_EXIT);
}
signal(sig, AlarmSignal);
alarm(2);
}
void User1Signal(int sig) {
signal(sig, User1Signal);
}
#ifdef USE_PAM
App::App(int argc, char** argv):
pam(conv, static_cast<void*>(&LoginPanel)){
#else
App::App(int argc, char** argv){
#endif
int tmp;
ServerPID = -1;
testing = false;
mcookie = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
daemonmode = false;
force_nodaemon = false;
firstlogin = true;
Dpy = NULL;
cfgfile = (char *)CFGFILE;
// Parse command line
// Note: we force a option for nodaemon switch to handle "-nodaemon"
while((tmp = getopt(argc, argv, "vhf:p:n:d?")) != EOF) {
switch (tmp) {
case 'p': // Test theme
testtheme = optarg;
testing = true;
if (testtheme == NULL) {
cerr << "The -p option requires an argument" << endl;
exit(ERR_EXIT);
}
break;
case 'd': // Daemon mode
daemonmode = true;
break;
case 'n': // Daemon mode
daemonmode = false;
force_nodaemon = true;
break;
case 'f': // Config file
cfgfile = optarg;
break;
case 'v': // Version
std::cout << APPNAME << " version " << VERSION << endl;
exit(OK_EXIT);
break;
case '?': // Illegal
cerr << endl;
case 'h': // Help
cerr << "usage: " << APPNAME << " [option ...]" << endl
<< "options:" << endl
<< " -d: daemon mode" << endl
<< " -nodaemon: no-daemon mode" << endl
<< " -v: show version" << endl
<< " -f /path/to/config: config file" << endl
<< " -p /path/to/theme/dir: preview theme" << endl;
exit(OK_EXIT);
break;
}
}
#ifndef XNEST_DEBUG
if (getuid() != 0 && !testing) {
cerr << APPNAME << ": only root can run this program" << endl;
exit(ERR_EXIT);
}
#endif
}
void App::Run() {
DisplayName = DISPLAY;
#ifdef XNEST_DEBUG
char* p = getenv("DISPLAY");
if (p && p[0]) {
DisplayName = p;
cout << "Using display name " << DisplayName << endl;
}
#endif
// Read configuration and theme
cfg = new Cfg;
cfg->readConf(cfgfile);
string themebase = "";
string themefile = "";
string themedir = "";
themeName = "";
if (testing) {
themeName = testtheme;
} else {
themebase = string(THEMESDIR) + "/";
themeName = cfg->getOption("current_theme");
string::size_type pos;
if ((pos = themeName.find(",")) != string::npos) {
// input is a set
themeName = findValidRandomTheme(themeName);
if (themeName == "") {
themeName = "default";
}
}
}
#ifdef USE_PAM
try{
pam.start("slim");
pam.set_item(PAM::Authenticator::TTY, DisplayName);
pam.set_item(PAM::Authenticator::Requestor, "root");
pam.set_item(PAM::Authenticator::Host, "localhost");
}
catch(PAM::Exception& e){
cerr << APPNAME << ": " << e << endl;
exit(ERR_EXIT);
};
#endif
bool loaded = false;
while (!loaded) {
themedir = themebase + themeName;
themefile = themedir + THEMESFILE;
if (!cfg->readConf(themefile)) {
if (themeName == "default") {
cerr << APPNAME << ": Failed to open default theme file "
<< themefile << endl;
exit(ERR_EXIT);
} else {
cerr << APPNAME << ": Invalid theme in config: "
<< themeName << endl;
themeName = "default";
}
} else {
loaded = true;
}
}
if (!testing) {
// Create lock file
LoginApp->GetLock();
// Start x-server
setenv("DISPLAY", DisplayName, 1);
signal(SIGQUIT, CatchSignal);
signal(SIGTERM, CatchSignal);
signal(SIGKILL, CatchSignal);
signal(SIGINT, CatchSignal);
signal(SIGHUP, CatchSignal);
signal(SIGPIPE, CatchSignal);
signal(SIGUSR1, User1Signal);
signal(SIGALRM, AlarmSignal);
#ifndef XNEST_DEBUG
OpenLog();
if (!force_nodaemon && cfg->getOption("daemon") == "yes") {
daemonmode = true;
}
// Daemonize
if (daemonmode) {
if (daemon(0, 1) == -1) {
cerr << APPNAME << ": " << strerror(errno) << endl;
exit(ERR_EXIT);
}
UpdatePid();
}
CreateServerAuth();
StartServer();
alarm(2);
#endif
}
// Open display
if((Dpy = XOpenDisplay(DisplayName)) == 0) {
cerr << APPNAME << ": could not open display '"
<< DisplayName << "'" << endl;
if (!testing) StopServer();
exit(ERR_EXIT);
}
// Get screen and root window
Scr = DefaultScreen(Dpy);
Root = RootWindow(Dpy, Scr);
// for tests we use a standard window
if (testing) {
Window RealRoot = RootWindow(Dpy, Scr);
Root = XCreateSimpleWindow(Dpy, RealRoot, 0, 0, 1280, 1024, 0, 0, 0);
XMapWindow(Dpy, Root);
XFlush(Dpy);
} else {
blankScreen();
}
int screenCount;
XineramaScreenInfo *screens = XineramaQueryScreens(Dpy, &screenCount);
if (screens != NULL) {
bool ok;
int screen = Cfg::string2int(cfg->getOption("xinerama_screen").c_str(), &ok);
if (!ok || screen >= screenCount)
screen = 0;
screenInfo = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo));
if (screenInfo == NULL) {
fprintf(stderr, "Can't allocate memory for Xinerama screeninfo.\n");
exit(ERR_EXIT);
}
memcpy(screenInfo, &screens[screen], sizeof(XineramaScreenInfo));
XFree(screens);
}
HideCursor();
if (!testing && XineramaIsActive(Dpy)) {
Root = XCreateSimpleWindow(Dpy, Root, ScreenLeft(), ScreenTop(), ScreenWidth(), ScreenHeight(), 0, 0, 0);
XMapWindow(Dpy, Root);
XFlush(Dpy);
}
// Create panel
LoginPanel = new Panel(Dpy, Scr, Root, cfg, themedir);
bool firstloop = true; // 1st time panel is shown (for automatic username)
bool focuspass = cfg->getOption("focus_password")=="yes";
bool autologin = cfg->getOption("auto_login")=="yes";
if (firstlogin && cfg->getOption("default_user") != "") {
LoginPanel->SetName(cfg->getOption("default_user") );
#ifdef USE_PAM
pam.set_item(PAM::Authenticator::User, cfg->getOption("default_user").c_str());
#endif
firstlogin = false;
if (autologin) {
Login();
}
}
// Start looping
int panelclosed = 1;
Panel::ActionType Action;
while(1) {
if(panelclosed) {
// Init root
setBackground(themedir);
// Close all clients
if (!testing) {
KillAllClients(False);
KillAllClients(True);
}
// Show panel
LoginPanel->OpenPanel();
}
LoginPanel->Reset();
if (firstloop && cfg->getOption("default_user") != "") {
LoginPanel->SetName(cfg->getOption("default_user") );
}
if (!AuthenticateUser(focuspass && firstloop)){
panelclosed = 0;
firstloop = false;
LoginPanel->ClearPanel();
XBell(Dpy, 100);
continue;
}
firstloop = false;
Action = LoginPanel->getAction();
// for themes test we just quit
if (testing) {
Action = Panel::Exit;
}
panelclosed = 1;
LoginPanel->ClosePanel();
switch(Action) {
case Panel::Login:
Login();
break;
case Panel::Console:
Console();
break;
case Panel::Reboot:
Reboot();
break;
case Panel::Halt:
Halt();
break;
case Panel::Suspend:
Suspend();
break;
case Panel::Exit:
Exit();
break;
}
}
}
#ifdef USE_PAM
bool App::AuthenticateUser(bool focuspass){
// Reset the username
try{
if (!focuspass)
pam.set_item(PAM::Authenticator::User, 0);
pam.authenticate();
}
catch(PAM::Auth_Exception& e){
switch(LoginPanel->getAction()){
case Panel::Exit:
case Panel::Console:
return true; // <--- This is simply fake!
default:
break;
};
cerr << APPNAME << ": " << e << endl;
return false;
}
catch(PAM::Exception& e){
cerr << APPNAME << ": " << e << endl;
exit(ERR_EXIT);
};
return true;
}
#else
bool App::AuthenticateUser(bool focuspass){
if (!focuspass){
LoginPanel->EventHandler(Panel::Get_Name);
switch(LoginPanel->getAction()){
case Panel::Exit:
case Panel::Console:
cerr << APPNAME << ": Got a special command (" << LoginPanel->GetName() << ")" << endl;
return true; // <--- This is simply fake!
default:
break;
}
}
LoginPanel->EventHandler(Panel::Get_Passwd);
char *encrypted, *correct;
struct passwd *pw;
switch(LoginPanel->getAction()){
case Panel::Suspend:
case Panel::Halt:
case Panel::Reboot:
pw = getpwnam("root");
break;
case Panel::Console:
case Panel::Exit:
case Panel::Login:
pw = getpwnam(LoginPanel->GetName().c_str());
break;
}
endpwent();
if(pw == 0)
return false;
#ifdef HAVE_SHADOW
struct spwd *sp = getspnam(pw->pw_name);
endspent();
if(sp)
correct = sp->sp_pwdp;
else
#endif // HAVE_SHADOW
correct = pw->pw_passwd;
if(correct == 0 || correct[0] == '\0')
return true;
encrypted = crypt(LoginPanel->GetPasswd().c_str(), correct);
return ((strcmp(encrypted, correct) == 0) ? true : false);
}
#endif
int App::GetServerPID() {
return ServerPID;
}
// Hide the cursor
void App::HideCursor() {
if (cfg->getOption("hidecursor") == "true") {
XColor black;
char cursordata[1];
Pixmap cursorpixmap;
Cursor cursor;
cursordata[0]=0;
cursorpixmap=XCreateBitmapFromData(Dpy,Root,cursordata,1,1);
black.red=0;
black.green=0;
black.blue=0;
cursor=XCreatePixmapCursor(Dpy,cursorpixmap,cursorpixmap,&black,&black,0,0);
XDefineCursor(Dpy,Root,cursor);
}
}
void App::Login() {
struct passwd *pw;
pid_t pid;
#ifdef USE_PAM
try{
pam.open_session();
pw = getpwnam(static_cast<const char*>(pam.get_item(PAM::Authenticator::User)));
}
catch(PAM::Cred_Exception& e){
// Credentials couldn't be established
cerr << APPNAME << ": " << e << endl;
return;
}
catch(PAM::Exception& e){
cerr << APPNAME << ": " << e << endl;
exit(ERR_EXIT);
};
#else
pw = getpwnam(LoginPanel->GetName().c_str());
#endif
endpwent();
if(pw == 0)
return;
if (pw->pw_shell[0] == '\0') {
setusershell();
strcpy(pw->pw_shell, getusershell());
endusershell();
}
// Setup the environment
char* term = getenv("TERM");
string maildir = _PATH_MAILDIR;
maildir.append("/");
maildir.append(pw->pw_name);
string xauthority = pw->pw_dir;
xauthority.append("/.Xauthority");
#ifdef USE_PAM
// Setup the PAM environment
try{
if(term) pam.setenv("TERM", term);
pam.setenv("HOME", pw->pw_dir);
pam.setenv("SHELL", pw->pw_shell);
pam.setenv("USER", pw->pw_name);
pam.setenv("LOGNAME", pw->pw_name);
pam.setenv("PATH", cfg->getOption("default_path").c_str());
pam.setenv("DISPLAY", DisplayName);
pam.setenv("MAIL", maildir.c_str());
pam.setenv("XAUTHORITY", xauthority.c_str());
}
catch(PAM::Exception& e){
cerr << APPNAME << ": " << e << endl;
exit(ERR_EXIT);
}
#endif
// Create new process
pid = fork();
if(pid == 0) {
#ifdef USE_PAM
// Get a copy of the environment and close the child's copy
// of the PAM-handle.
char** child_env = pam.getenvlist();
pam.end();
#else
const int Num_Of_Variables = 10; // Number of env. variables + 1
char** child_env = static_cast<char**>(malloc(sizeof(char*)*Num_Of_Variables));
int n = 0;
if(term) child_env[n++]=StrConcat("TERM=", term);
child_env[n++]=StrConcat("HOME=", pw->pw_dir);
child_env[n++]=StrConcat("SHELL=", pw->pw_shell);
child_env[n++]=StrConcat("USER=", pw->pw_name);
child_env[n++]=StrConcat("LOGNAME=", pw->pw_name);
child_env[n++]=StrConcat("PATH=", cfg->getOption("default_path").c_str());
child_env[n++]=StrConcat("DISPLAY=", DisplayName);
child_env[n++]=StrConcat("MAIL=", maildir.c_str());
child_env[n++]=StrConcat("XAUTHORITY=", xauthority.c_str());
child_env[n++]=0;
#endif
// Login process starts here
SwitchUser Su(pw, cfg, DisplayName, child_env);
string session = LoginPanel->getSession();
string loginCommand = cfg->getOption("login_cmd");
replaceVariables(loginCommand, SESSION_VAR, session);
replaceVariables(loginCommand, THEME_VAR, themeName);
string sessStart = cfg->getOption("sessionstart_cmd");
if (sessStart != "") {
replaceVariables(sessStart, USER_VAR, pw->pw_name);
system(sessStart.c_str());
}
Su.Login(loginCommand.c_str(), mcookie.c_str());
_exit(OK_EXIT);
}
#ifndef XNEST_DEBUG
CloseLog();
#endif
// Wait until user is logging out (login process terminates)
pid_t wpid = -1;
int status;
while (wpid != pid) {
wpid = wait(&status);
}
if (WIFEXITED(status) && WEXITSTATUS(status)) {
LoginPanel->Message("Failed to execute login command");
sleep(3);
} else {
string sessStop = cfg->getOption("sessionstop_cmd");
if (sessStop != "") {
replaceVariables(sessStop, USER_VAR, pw->pw_name);
system(sessStop.c_str());
}
}
#ifdef USE_PAM
try{
pam.close_session();
}
catch(PAM::Exception& e){
cerr << APPNAME << ": " << e << endl;
};
#endif
// Close all clients
KillAllClients(False);
KillAllClients(True);
// Send HUP signal to clientgroup
killpg(pid, SIGHUP);
// Send TERM signal to clientgroup, if error send KILL
if(killpg(pid, SIGTERM))
killpg(pid, SIGKILL);
HideCursor();
#ifndef XNEST_DEBUG
// Re-activate log file
OpenLog();
RestartServer();
#endif
}
void App::Reboot() {
// Stop alarm clock
alarm(0);
#ifdef USE_PAM
try{
pam.end();
}
catch(PAM::Exception& e){
cerr << APPNAME << ": " << e << endl;
};
#endif
// Write message
LoginPanel->Message((char*)cfg->getOption("reboot_msg").c_str());
sleep(3);
// Stop server and reboot
StopServer();
RemoveLock();
system(cfg->getOption("reboot_cmd").c_str());
exit(OK_EXIT);
}
void App::Halt() {
// Stop alarm clock
alarm(0);
#ifdef USE_PAM
try{
pam.end();
}
catch(PAM::Exception& e){
cerr << APPNAME << ": " << e << endl;
};
#endif
// Write message
LoginPanel->Message((char*)cfg->getOption("shutdown_msg").c_str());
sleep(3);
// Stop server and halt
StopServer();
RemoveLock();
system(cfg->getOption("halt_cmd").c_str());
exit(OK_EXIT);
}
void App::Suspend() {
sleep(1);
system(cfg->getOption("suspend_cmd").c_str());
}
void App::Console() {
int posx = 40;
int posy = 40;
int fontx = 9;
int fonty = 15;
int width = (ScreenWidth() - (posx * 2)) / fontx;
int height = (ScreenHeight() - (posy * 2)) / fonty;
// Execute console
const char* cmd = cfg->getOption("console_cmd").c_str();
char *tmp = new char[strlen(cmd) + 60];
sprintf(tmp, cmd, width, height, posx, posy, fontx, fonty);
system(tmp);
delete [] tmp;
}
void App::Exit() {
#ifdef USE_PAM
try{
pam.end();
}
catch(PAM::Exception& e){
cerr << APPNAME << ": " << e << endl;
};
#endif
if (testing) {
const char* testmsg = "This is a test message :-)";
LoginPanel->Message(testmsg);
sleep(3);
delete LoginPanel;
XCloseDisplay(Dpy);
} else {
delete LoginPanel;
StopServer();
RemoveLock();
}
delete cfg;
if (screenInfo != NULL)
free(screenInfo);
exit(OK_EXIT);
}
int CatchErrors(Display *dpy, XErrorEvent *ev) {
return 0;
}
void App::RestartServer() {
#ifdef USE_PAM
try{
pam.end();
}
catch(PAM::Exception& e){
cerr << APPNAME << ": " << e << endl;
};
#endif
StopServer();
RemoveLock();
Run();
}
void App::KillAllClients(Bool top) {
Window dummywindow;
Window *children;
unsigned int nchildren;
unsigned int i;
XWindowAttributes attr;
XSync(Dpy, 0);
XSetErrorHandler(CatchErrors);
nchildren = 0;
XQueryTree(Dpy, Root, &dummywindow, &dummywindow, &children, &nchildren);
if(!top) {
for(i=0; i<nchildren; i++) {
if(XGetWindowAttributes(Dpy, children[i], &attr) && (attr.map_state == IsViewable))
children[i] = XmuClientWindow(Dpy, children[i]);
else
children[i] = 0;
}
}
for(i=0; i<nchildren; i++) {
if(children[i])
XKillClient(Dpy, children[i]);
}
XFree((char *)children);
XSync(Dpy, 0);
XSetErrorHandler(NULL);
}
int App::ServerTimeout(int timeout, char* text) {
int i = 0;
int pidfound = -1;
static char *lasttext;
for(;;) {
pidfound = waitpid(ServerPID, NULL, WNOHANG);
if(pidfound == ServerPID)
break;
if(timeout) {
if(i == 0 && text != lasttext)
cerr << endl << APPNAME << ": waiting for " << text;
else
cerr << ".";
}
if(timeout)
sleep(1);
if(++i > timeout)
break;
}
if(i > 0)
cerr << endl;
lasttext = text;
return (ServerPID != pidfound);
}
int App::WaitForServer() {
int ncycles = 120;
int cycles;
for(cycles = 0; cycles < ncycles; cycles++) {
if((Dpy = XOpenDisplay(DisplayName))) {
return 1;
} else {
if(!ServerTimeout(1, (char *) "X server to begin accepting connections"))
break;
}
}
cerr << "Giving up." << endl;
return 0;
}
int App::StartServer() {
ServerPID = vfork();
static const int MAX_XSERVER_ARGS = 256;
static char* server[MAX_XSERVER_ARGS+2] = { NULL };
server[0] = (char *)cfg->getOption("default_xserver").c_str();
string argOption = cfg->getOption("xserver_arguments");
/* Add mandatory -xauth option */
argOption = argOption + " -auth " + cfg->getOption("authfile");
char* args = new char[argOption.length()+2]; // NULL plus vt
strcpy(args, argOption.c_str());
int argc = 1;
int pos = 0;
bool hasVtSet = false;
while (args[pos] != '\0') {
if (args[pos] == ' ' || args[pos] == '\t') {
*(args+pos) = '\0';
server[argc++] = args+pos+1;
} else if (pos == 0) {
server[argc++] = args+pos;
}
++pos;
if (argc+1 >= MAX_XSERVER_ARGS) {
// ignore _all_ arguments to make sure the server starts at
// all
argc = 1;
break;
}
}
for (int i=0; i<argc; i++) {
if (server[i][0] == 'v' && server[i][1] == 't') {
bool ok = false;
Cfg::string2int(server[i]+2, &ok);
if (ok) {
hasVtSet = true;
}
}
}
if (!hasVtSet && daemonmode) {
server[argc++] = (char*)"vt07";
}
server[argc] = NULL;
switch(ServerPID) {
case 0:
signal(SIGTTIN, SIG_IGN);
signal(SIGTTOU, SIG_IGN);
signal(SIGUSR1, SIG_IGN);
setpgid(0,getpid());
execvp(server[0], server);
cerr << APPNAME << ": X server could not be started" << endl;
exit(ERR_EXIT);
break;
case -1:
break;
default:
errno = 0;
if(!ServerTimeout(0, (char *)"")) {
ServerPID = -1;
break;
}
alarm(15);
pause();
alarm(0);
// Wait for server to start up
if(WaitForServer() == 0) {
cerr << APPNAME << ": unable to connect to X server" << endl;
StopServer();
ServerPID = -1;
exit(ERR_EXIT);
}
break;
}
string numlock = cfg->getOption("numlock");
if (numlock == "on") {
NumLock::setOn();
} else if (numlock == "off") {
NumLock::setOff();
}
delete args;
return ServerPID;
}
jmp_buf CloseEnv;
int IgnoreXIO(Display *d) {
cerr << APPNAME << ": connection to X server lost." << endl;
longjmp(CloseEnv, 1);
}
void App::StopServer() {
// Stop alars clock and ignore signals
alarm(0);
signal(SIGQUIT, SIG_IGN);
signal(SIGINT, SIG_IGN);
signal(SIGHUP, SIG_IGN);
signal(SIGPIPE, SIG_IGN);
signal(SIGTERM, SIG_DFL);
signal(SIGKILL, SIG_DFL);
signal(SIGALRM, SIG_DFL);
// Catch X error
XSetIOErrorHandler(IgnoreXIO);
if(!setjmp(CloseEnv) && Dpy)
XCloseDisplay(Dpy);
// Send HUP to process group
errno = 0;
if((killpg(getpid(), SIGHUP) != 0) && (errno != ESRCH))
cerr << APPNAME << ": can't send HUP to process group " << getpid() << endl;