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git.ipfire.org Git - thirdparty/systemd.git/blob - src/core/killall.c
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1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 ProFUSION embedded systems
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
28 #include "formats-util.h"
30 #include "parse-util.h"
31 #include "process-util.h"
33 #include "string-util.h"
34 #include "terminal-util.h"
37 #define TIMEOUT_USEC (10 * USEC_PER_SEC)
39 static bool ignore_proc(pid_t pid
) {
40 _cleanup_fclose_
FILE *f
= NULL
;
47 /* We are PID 1, let's not commit suicide */
51 r
= get_process_uid(pid
, &uid
);
53 return true; /* not really, but better safe than sorry */
55 /* Non-root processes otherwise are always subject to be killed */
59 p
= procfs_file_alloca(pid
, "cmdline");
62 return true; /* not really, but has the desired effect */
64 count
= fread(&c
, 1, 1, f
);
66 /* Kernel threads have an empty cmdline */
70 /* Processes with argv[0][0] = '@' we ignore from the killing
73 * http://www.freedesktop.org/wiki/Software/systemd/RootStorageDaemons */
74 if (count
== 1 && c
== '@')
80 static void wait_for_children(Set
*pids
, sigset_t
*mask
) {
85 if (set_isempty(pids
))
88 until
= now(CLOCK_MONOTONIC
) + TIMEOUT_USEC
;
96 /* First, let the kernel inform us about killed
97 * children. Most processes will probably be our
98 * children, but some are not (might be our
99 * grandchildren instead...). */
103 pid
= waitpid(-1, NULL
, WNOHANG
);
110 log_error_errno(errno
, "waitpid() failed: %m");
114 (void) set_remove(pids
, PID_TO_PTR(pid
));
117 /* Now explicitly check who might be remaining, who
118 * might not be our child. */
119 SET_FOREACH(p
, pids
, i
) {
121 /* We misuse getpgid as a check whether a
122 * process still exists. */
123 if (getpgid(PTR_TO_PID(p
)) >= 0)
132 if (set_isempty(pids
))
135 n
= now(CLOCK_MONOTONIC
);
139 timespec_store(&ts
, until
- n
);
140 k
= sigtimedwait(mask
, NULL
, &ts
);
143 if (k
< 0 && errno
!= EAGAIN
) {
144 log_error_errno(errno
, "sigtimedwait() failed: %m");
149 log_warning("sigtimedwait() returned unexpected signal.");
154 static int killall(int sig
, Set
*pids
, bool send_sighup
) {
155 _cleanup_closedir_
DIR *dir
= NULL
;
158 dir
= opendir("/proc");
162 while ((d
= readdir(dir
))) {
166 if (d
->d_type
!= DT_DIR
&&
167 d
->d_type
!= DT_UNKNOWN
)
170 if (parse_pid(d
->d_name
, &pid
) < 0)
173 if (ignore_proc(pid
))
176 if (sig
== SIGKILL
) {
177 _cleanup_free_
char *s
= NULL
;
179 get_process_comm(pid
, &s
);
180 log_notice("Sending SIGKILL to PID "PID_FMT
" (%s).", pid
, strna(s
));
183 if (kill(pid
, sig
) >= 0) {
185 r
= set_put(pids
, PID_TO_PTR(pid
));
189 } else if (errno
!= ENOENT
)
190 log_warning_errno(errno
, "Could not kill %d: %m", pid
);
193 /* Optionally, also send a SIGHUP signal, but
194 only if the process has a controlling
195 tty. This is useful to allow handling of
196 shells which ignore SIGTERM but react to
197 SIGHUP. We do not send this to processes that
198 have no controlling TTY since we don't want to
199 trigger reloads of daemon processes. Also we
200 make sure to only send this after SIGTERM so
201 that SIGTERM is always first in the queue. */
204 if (get_ctty_devnr(pid
, NULL
) >= 0)
209 return set_size(pids
);
212 void broadcast_signal(int sig
, bool wait_for_exit
, bool send_sighup
) {
213 sigset_t mask
, oldmask
;
214 _cleanup_set_free_ Set
*pids
= NULL
;
217 pids
= set_new(NULL
);
219 assert_se(sigemptyset(&mask
) == 0);
220 assert_se(sigaddset(&mask
, SIGCHLD
) == 0);
221 assert_se(sigprocmask(SIG_BLOCK
, &mask
, &oldmask
) == 0);
223 if (kill(-1, SIGSTOP
) < 0 && errno
!= ESRCH
)
224 log_warning_errno(errno
, "kill(-1, SIGSTOP) failed: %m");
226 killall(sig
, pids
, send_sighup
);
228 if (kill(-1, SIGCONT
) < 0 && errno
!= ESRCH
)
229 log_warning_errno(errno
, "kill(-1, SIGCONT) failed: %m");
232 wait_for_children(pids
, &mask
);
234 assert_se(sigprocmask(SIG_SETMASK
, &oldmask
, NULL
) == 0);