exec: drop process group kill mode since it has little use and confuses the user

TODO

@@ -12,8 +12,6 @@ F15:
 
 * hook emergency.target into local-fs.target in some way as OnFailure with isolate
 
-* drop SIGHUP handling from rsyslog.service upstream (PENDING)
-
 * teach dbus to activate all services it finds in /etc/systemd/services/org-*.service
 
 * save/restore tool for SysV as requested by FPC (PENDING)
@@ -27,8 +25,6 @@ F15:
 
 * document default dependencies
 
-* remove KillMode=process-group
-
 * kernel patch wegen kmsg prio nach f15
 
 * LOG_DAEMON/LOG_USER für kmsg messages schreiben
@@ -41,8 +37,6 @@ Features:
 
 * when key file cannot be found, read it from kbd in cryptsetup
 
-* hide passwords on TAB
-
 * get rid of random file name in generator directory?
     /run/systemd/generator-IH1vFu
 

man/systemctl.xml

@@ -304,13 +304,11 @@
                                 <command>kill</command>, choose the
                                 mode how to kill the selected
                                 processes. Must be one of
-                                <option>control-group</option>,
+                                <option>control-group</option> or
-                                <option>process-group</option> or
                                 <option>process</option> to select
                                 whether to kill the entire control
-                                group, the process group or only the
+                                group or only the selected process
-                                selected process itself. If omitted
+                                itself. If omitted defaults to
-                                defaults to
                                 <option>control-group</option> if
                                 <option>--kill-who=all</option> is
                                 set, or <option>process</option>

man/systemd.mount.xml

@@ -221,7 +221,6 @@
                                 processes of this mount shall be
                                 killed. One of
                                 <option>control-group</option>,
-                                <option>process-group</option>,
                                 <option>process</option>,
                                 <option>none</option>.</para>
 

man/systemd.service.xml

@@ -558,7 +558,6 @@
                                 processes of this service shall be
                                 killed. One of
                                 <option>control-group</option>,
-                                <option>process-group</option>,
                                 <option>process</option>,
                                 <option>none</option>.</para>
 
@@ -570,10 +569,6 @@
                                 stop command (as configured with
                                 <varname>ExecStop=</varname>) is
                                 executed. If set to
-                                <option>process-group</option> only
-                                the members of the process group of
-                                the main service process are
-                                killed. If set to
                                 <option>process</option> only the main
                                 process itself is killed. If set to
                                 <option>none</option> no process is

man/systemd.socket.xml

@@ -519,7 +519,6 @@
                                 processes of this socket unit shall be
                                 killed. One of
                                 <option>control-group</option>,
-                                <option>process-group</option>,
                                 <option>process</option>,
                                 <option>none</option>.</para>
 

man/systemd.swap.xml

@@ -175,7 +175,6 @@
                                 processes of this swap shall be
                                 killed. One of
                                 <option>control-group</option>,
-                                <option>process-group</option>,
                                 <option>process</option>,
                                 <option>none</option>.</para>
 

src/execute.c

@@ -1933,7 +1933,6 @@ DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
 
 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
         [KILL_CONTROL_GROUP] = "control-group",
-        [KILL_PROCESS_GROUP] = "process-group",
         [KILL_PROCESS] = "process",
         [KILL_NONE] = "none"
 };

src/execute.h

@@ -43,7 +43,6 @@ struct CGroupBonding;
 
 typedef enum KillMode {
         KILL_CONTROL_GROUP = 0,
-        KILL_PROCESS_GROUP,
         KILL_PROCESS,
         KILL_NONE,
         _KILL_MODE_MAX,

src/mount.c

@@ -747,9 +747,7 @@ static void mount_enter_signal(Mount *m, MountState state, bool success) {
                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 
                 if (m->control_pid > 0) {
-                        if (kill_and_sigcont(m->exec_context.kill_mode == KILL_PROCESS_GROUP ?
+                        if (kill_and_sigcont(m->control_pid, sig) < 0 && errno != ESRCH)
-                                             -m->control_pid :
-                                             m->control_pid, sig) < 0 && errno != ESRCH)
 
                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
                         else
@@ -1684,7 +1682,7 @@ static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError
         }
 
         if (m->control_pid > 0)
-                if (kill(mode == KILL_PROCESS_GROUP ? -m->control_pid : m->control_pid, signo) < 0)
+                if (kill(m->control_pid, signo) < 0)
                         r = -errno;
 
         if (mode == KILL_CONTROL_GROUP) {

src/service.c

@@ -828,7 +828,7 @@ static int service_load_sysv_path(Service *s, const char *path) {
         s->exec_context.std_output =
                 (s->meta.manager->sysv_console || s->exec_context.std_input == EXEC_INPUT_TTY)
                 ? EXEC_OUTPUT_TTY : s->meta.manager->default_std_output;
-        s->exec_context.kill_mode = KILL_PROCESS_GROUP;
+        s->exec_context.kill_mode = KILL_PROCESS;
 
         /* We use the long description only if
          * no short description is set. */
@@ -1838,19 +1838,14 @@ static void service_enter_signal(Service *s, ServiceState state, bool success) {
                 int sig = (state == SERVICE_STOP_SIGTERM || state == SERVICE_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
 
                 if (s->main_pid > 0) {
-                        if (kill_and_sigcont(s->exec_context.kill_mode == KILL_PROCESS_GROUP ?
+                        if (kill_and_sigcont(s->main_pid, sig) < 0 && errno != ESRCH)
-                                             -s->main_pid :
-                                             s->main_pid, sig) < 0 && errno != ESRCH)
-
                                 log_warning("Failed to kill main process %li: %m", (long) s->main_pid);
                         else
                                 wait_for_exit = true;
                 }
 
                 if (s->control_pid > 0) {
-                        if (kill_and_sigcont(s->exec_context.kill_mode == KILL_PROCESS_GROUP ?
+                        if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH)
-                                             -s->control_pid :
-                                             s->control_pid, sig) < 0 && errno != ESRCH)
 
                                 log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
                         else
@@ -3212,11 +3207,11 @@ static int service_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusErro
         }
 
         if (s->control_pid > 0)
-                if (kill(mode == KILL_PROCESS_GROUP ? -s->control_pid : s->control_pid, signo) < 0)
+                if (kill(s->control_pid, signo) < 0)
                         r = -errno;
 
         if (s->main_pid > 0)
-                if (kill(mode == KILL_PROCESS_GROUP ? -s->main_pid : s->main_pid, signo) < 0)
+                if (kill(s->main_pid, signo) < 0)
                         r = -errno;
 
         if (mode == KILL_CONTROL_GROUP) {

src/socket.c

@@ -1040,9 +1040,7 @@ static void socket_enter_signal(Socket *s, SocketState state, bool success) {
                 int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
 
                 if (s->control_pid > 0) {
-                        if (kill_and_sigcont(s->exec_context.kill_mode == KILL_PROCESS_GROUP ?
+                        if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH)
-                                             -s->control_pid :
-                                             s->control_pid, sig) < 0 && errno != ESRCH)
 
                                 log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
                         else
@@ -1837,7 +1835,7 @@ static int socket_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError
         }
 
         if (s->control_pid > 0)
-                if (kill(mode == KILL_PROCESS_GROUP ? -s->control_pid : s->control_pid, signo) < 0)
+                if (kill(s->control_pid, signo) < 0)
                         r = -errno;
 
         if (mode == KILL_CONTROL_GROUP) {

src/swap.c

@@ -661,9 +661,7 @@ static void swap_enter_signal(Swap *s, SwapState state, bool success) {
                            state == SWAP_DEACTIVATING_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
 
                 if (s->control_pid > 0) {
-                        if (kill_and_sigcont(s->exec_context.kill_mode == KILL_PROCESS_GROUP ?
+                        if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH)
-                                             -s->control_pid :
-                                             s->control_pid, sig) < 0 && errno != ESRCH)
 
                                 log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
                         else
@@ -1286,7 +1284,7 @@ static int swap_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *
         }
 
         if (s->control_pid > 0)
-                if (kill(mode == KILL_PROCESS_GROUP ? -s->control_pid : s->control_pid, signo) < 0)
+                if (kill(s->control_pid, signo) < 0)
                         r = -errno;
 
         if (mode == KILL_CONTROL_GROUP) {

src/systemctl-bash-completion.sh

@@ -60,7 +60,7 @@ _systemctl () {
                                 comps='all control main'
                         ;;
                         --kill-mode)
-                                comps='control-group process process-group'
+                                comps='control-group process'
                         ;;
                         --property|-p)
                                 comps=''

units/console-shell.service.m4

@@ -31,7 +31,7 @@ WorkingDirectory=/root
 ExecStart=-/sbin/sulogin
 ExecStopPost=-/bin/systemctl poweroff
 StandardInput=tty-force
-KillMode=process-group
+KillMode=process
 
 # Bash ignores SIGTERM, so we send SIGHUP instead, to ensure that bash
 # terminates cleanly.

units/emergency.service

@@ -21,7 +21,7 @@ ExecStartPre=-/bin/echo 'Welcome to emergency mode. Use "systemctl default" or ^
 ExecStart=-/sbin/sulogin
 ExecStopPost=/bin/systemctl --fail default
 StandardInput=tty-force
-KillMode=process-group
+KillMode=process
 
 # Bash ignores SIGTERM, so we send SIGHUP instead, to ensure that bash
 # terminates cleanly.

units/getty@.service.m4

@@ -36,7 +36,7 @@ ExecStart=-/sbin/agetty %I 38400
 Restart=always
 RestartSec=0
 UtmpIdentifier=%I
-KillMode=process-group
+KillMode=process
 
 # Unset locale for the console getty since the console has problems
 # displaying some internationalized messages.

units/rescue.service.m4

@@ -28,7 +28,7 @@ ExecStart=-/bin/bash -c "exec ${SINGLE}"',
 `ExecStart=-/sbin/sulogin'))
 ExecStopPost=-/bin/systemctl --fail default
 StandardInput=tty-force
-KillMode=process-group
+KillMode=process
 
 # Bash ignores SIGTERM, so we send SIGHUP instead, to ensure that bash
 # terminates cleanly.

units/serial-getty@.service.m4

@@ -36,7 +36,7 @@ ExecStart=-/sbin/agetty -s %I 115200,38400,9600
 Restart=always
 RestartSec=0
 UtmpIdentifier=%I
-KillMode=process-group
+KillMode=process
 
 # Some login implementations ignore SIGTERM, so we send SIGHUP
 # instead, to ensure that login terminates cleanly.