From: Lennart Poettering Date: Thu, 3 Mar 2011 22:55:30 +0000 (+0100) Subject: kill: always send SIGCONT after SIGTERM X-Git-Tag: v20~32 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=430c18ed7f576fd9041b0a02e7c4210bdd020a25;p=systemd kill: always send SIGCONT after SIGTERM When we kill a process to terminate it make sure to send SIGCONT to ensure it is unpaused and processes the signal. --- diff --git a/TODO b/TODO index 848ea213..820391db 100644 --- a/TODO +++ b/TODO @@ -20,13 +20,11 @@ F15: * hook emergency.target into local-fs.target in some way as OnFailure with isolate -* convince Karel to give us our own mount option prefix - Features: -* show failure error string in "systemctl status" +* introduce "x-systemd-automount" as alternative to the "comment=systemd.automount" mount option -* send SIGCONT before SIGTERM +* show failure error string in "systemctl status" * make sure timeouts are applied to Type=oneshot services. diff --git a/src/cgroup-util.c b/src/cgroup-util.c index b68b9ad3..055c9061 100644 --- a/src/cgroup-util.c +++ b/src/cgroup-util.c @@ -166,7 +166,7 @@ int cg_rmdir(const char *controller, const char *path) { return r < 0 ? -errno : 0; } -int cg_kill(const char *controller, const char *path, int sig, bool ignore_self, Set *s) { +int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s) { bool done = false; int r, ret = 0; pid_t my_pid; @@ -211,8 +211,13 @@ int cg_kill(const char *controller, const char *path, int sig, bool ignore_self, if (kill(pid, sig) < 0) { if (ret >= 0 && errno != ESRCH) ret = -errno; - } else if (ret == 0) + } else if (ret == 0) { + + if (sigcont) + kill(pid, SIGCONT); + ret = 1; + } done = false; @@ -250,7 +255,7 @@ finish: return ret; } -int cg_kill_recursive(const char *controller, const char *path, int sig, bool ignore_self, bool rem, Set *s) { +int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) { int r, ret = 0; DIR *d = NULL; char *fn; @@ -264,7 +269,7 @@ int cg_kill_recursive(const char *controller, const char *path, int sig, bool ig if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func))) return -ENOMEM; - ret = cg_kill(controller, path, sig, ignore_self, s); + ret = cg_kill(controller, path, sig, sigcont, ignore_self, s); if ((r = cg_enumerate_subgroups(controller, path, &d)) < 0) { if (ret >= 0 && r != -ENOENT) @@ -286,7 +291,7 @@ int cg_kill_recursive(const char *controller, const char *path, int sig, bool ig goto finish; } - r = cg_kill_recursive(controller, p, sig, ignore_self, rem, s); + r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s); free(p); if (r != 0 && ret >= 0) @@ -336,7 +341,7 @@ int cg_kill_recursive_and_wait(const char *controller, const char *path, bool re else sig = 0; - if ((r = cg_kill_recursive(controller, path, sig, true, rem, NULL)) <= 0) + if ((r = cg_kill_recursive(controller, path, sig, true, true, rem, NULL)) <= 0) return r; usleep(200 * USEC_PER_MSEC); diff --git a/src/cgroup-util.h b/src/cgroup-util.h index 2cb6ede4..73df9697 100644 --- a/src/cgroup-util.h +++ b/src/cgroup-util.h @@ -37,8 +37,8 @@ int cg_read_pid(FILE *f, pid_t *_pid); int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d); int cg_read_subgroup(DIR *d, char **fn); -int cg_kill(const char *controller, const char *path, int sig, bool ignore_self, Set *s); -int cg_kill_recursive(const char *controller, const char *path, int sig, bool ignore_self, bool remove, Set *s); +int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s); +int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool remove, Set *s); int cg_kill_recursive_and_wait(const char *controller, const char *path, bool remove); int cg_migrate(const char *controller, const char *from, const char *to, bool ignore_self); diff --git a/src/cgroup.c b/src/cgroup.c index 729cc75e..b75fe0be 100644 --- a/src/cgroup.c +++ b/src/cgroup.c @@ -140,7 +140,7 @@ int cgroup_bonding_install_list(CGroupBonding *first, pid_t pid) { return 0; } -int cgroup_bonding_kill(CGroupBonding *b, int sig, Set *s) { +int cgroup_bonding_kill(CGroupBonding *b, int sig, bool sigcont, Set *s) { assert(b); assert(sig >= 0); @@ -148,10 +148,10 @@ int cgroup_bonding_kill(CGroupBonding *b, int sig, Set *s) { if (!b->realized || !b->ours) return 0; - return cg_kill_recursive(b->controller, b->path, sig, true, false, s); + return cg_kill_recursive(b->controller, b->path, sig, sigcont, true, false, s); } -int cgroup_bonding_kill_list(CGroupBonding *first, int sig, Set *s) { +int cgroup_bonding_kill_list(CGroupBonding *first, int sig, bool sigcont, Set *s) { CGroupBonding *b; Set *allocated_set = NULL; int ret = -EAGAIN, r; @@ -161,7 +161,7 @@ int cgroup_bonding_kill_list(CGroupBonding *first, int sig, Set *s) { return -ENOMEM; LIST_FOREACH(by_unit, b, first) { - if ((r = cgroup_bonding_kill(b, sig, s)) < 0) { + if ((r = cgroup_bonding_kill(b, sig, sigcont, s)) < 0) { if (r == -EAGAIN || r == -ESRCH) continue; diff --git a/src/cgroup.h b/src/cgroup.h index 89854ff3..a6ac90fb 100644 --- a/src/cgroup.h +++ b/src/cgroup.h @@ -59,8 +59,8 @@ void cgroup_bonding_free_list(CGroupBonding *first); int cgroup_bonding_install(CGroupBonding *b, pid_t pid); int cgroup_bonding_install_list(CGroupBonding *first, pid_t pid); -int cgroup_bonding_kill(CGroupBonding *b, int sig, Set *s); -int cgroup_bonding_kill_list(CGroupBonding *first, int sig, Set *s); +int cgroup_bonding_kill(CGroupBonding *b, int sig, bool sigcont, Set *s); +int cgroup_bonding_kill_list(CGroupBonding *first, int sig, bool sigcont, Set *s); void cgroup_bonding_trim(CGroupBonding *first, bool delete_root); void cgroup_bonding_trim_list(CGroupBonding *first, bool delete_root); diff --git a/src/execute.c b/src/execute.c index d6f09e26..281d90da 100644 --- a/src/execute.c +++ b/src/execute.c @@ -894,8 +894,10 @@ fail: closelog(); - if (pam_pid > 1) + if (pam_pid > 1) { kill(pam_pid, SIGTERM); + kill(pam_pid, SIGCONT); + } return EXIT_PAM; } diff --git a/src/mount.c b/src/mount.c index 88b54bbb..8a9ab167 100644 --- a/src/mount.c +++ b/src/mount.c @@ -729,9 +729,9 @@ 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(m->exec_context.kill_mode == KILL_PROCESS_GROUP ? - -m->control_pid : - m->control_pid, sig) < 0 && errno != ESRCH) + if (kill_and_sigcont(m->exec_context.kill_mode == KILL_PROCESS_GROUP ? + -m->control_pid : + m->control_pid, sig) < 0 && errno != ESRCH) log_warning("Failed to kill control process %li: %m", (long) m->control_pid); else @@ -750,7 +750,7 @@ static void mount_enter_signal(Mount *m, MountState state, bool success) { if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) goto fail; - if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, pid_set)) < 0) { + if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, true, pid_set)) < 0) { if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) log_warning("Failed to kill control group: %s", strerror(-r)); } else if (r > 0) @@ -1678,7 +1678,7 @@ static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError goto finish; } - if ((q = cgroup_bonding_kill_list(m->meta.cgroup_bondings, signo, pid_set)) < 0) + if ((q = cgroup_bonding_kill_list(m->meta.cgroup_bondings, signo, false, pid_set)) < 0) if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) r = q; } diff --git a/src/service.c b/src/service.c index 39a46d6c..85175793 100644 --- a/src/service.c +++ b/src/service.c @@ -1830,9 +1830,9 @@ 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(s->exec_context.kill_mode == KILL_PROCESS_GROUP ? - -s->main_pid : - s->main_pid, sig) < 0 && errno != ESRCH) + if (kill_and_sigcont(s->exec_context.kill_mode == KILL_PROCESS_GROUP ? + -s->main_pid : + s->main_pid, sig) < 0 && errno != ESRCH) log_warning("Failed to kill main process %li: %m", (long) s->main_pid); else @@ -1840,9 +1840,9 @@ static void service_enter_signal(Service *s, ServiceState state, bool success) { } if (s->control_pid > 0) { - if (kill(s->exec_context.kill_mode == KILL_PROCESS_GROUP ? - -s->control_pid : - s->control_pid, sig) < 0 && errno != ESRCH) + if (kill_and_sigcont(s->exec_context.kill_mode == KILL_PROCESS_GROUP ? + -s->control_pid : + s->control_pid, sig) < 0 && errno != ESRCH) log_warning("Failed to kill control process %li: %m", (long) s->control_pid); else @@ -1865,7 +1865,7 @@ static void service_enter_signal(Service *s, ServiceState state, bool success) { if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) goto fail; - if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, pid_set)) < 0) { + if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, true, pid_set)) < 0) { if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) log_warning("Failed to kill control group: %s", strerror(-r)); } else if (r > 0) @@ -3230,7 +3230,7 @@ static int service_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusErro goto finish; } - if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, pid_set)) < 0) + if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, false, pid_set)) < 0) if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) r = q; } diff --git a/src/socket.c b/src/socket.c index 96c649b0..77bbe43e 100644 --- a/src/socket.c +++ b/src/socket.c @@ -1039,9 +1039,9 @@ 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(s->exec_context.kill_mode == KILL_PROCESS_GROUP ? - -s->control_pid : - s->control_pid, sig) < 0 && errno != ESRCH) + if (kill_and_sigcont(s->exec_context.kill_mode == KILL_PROCESS_GROUP ? + -s->control_pid : + s->control_pid, sig) < 0 && errno != ESRCH) log_warning("Failed to kill control process %li: %m", (long) s->control_pid); else @@ -1060,7 +1060,7 @@ static void socket_enter_signal(Socket *s, SocketState state, bool success) { if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) goto fail; - if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, pid_set)) < 0) { + if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, true, pid_set)) < 0) { if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) log_warning("Failed to kill control group: %s", strerror(-r)); } else if (r > 0) @@ -1852,7 +1852,7 @@ static int socket_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError goto finish; } - if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, pid_set)) < 0) + if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, false, pid_set)) < 0) if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) r = q; } diff --git a/src/swap.c b/src/swap.c index 4ffe19f1..f59b0fb1 100644 --- a/src/swap.c +++ b/src/swap.c @@ -660,9 +660,9 @@ 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(s->exec_context.kill_mode == KILL_PROCESS_GROUP ? - -s->control_pid : - s->control_pid, sig) < 0 && errno != ESRCH) + if (kill_and_sigcont(s->exec_context.kill_mode == KILL_PROCESS_GROUP ? + -s->control_pid : + s->control_pid, sig) < 0 && errno != ESRCH) log_warning("Failed to kill control process %li: %m", (long) s->control_pid); else @@ -681,7 +681,7 @@ static void swap_enter_signal(Swap *s, SwapState state, bool success) { if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) goto fail; - if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, pid_set)) < 0) { + if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, true, pid_set)) < 0) { if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) log_warning("Failed to kill control group: %s", strerror(-r)); } else if (r > 0) @@ -1301,7 +1301,7 @@ static int swap_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError * goto finish; } - if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, pid_set)) < 0) + if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, false, pid_set)) < 0) if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) r = q; } diff --git a/src/systemctl.c b/src/systemctl.c index c3f47a13..2e8d1073 100644 --- a/src/systemctl.c +++ b/src/systemctl.c @@ -5532,6 +5532,7 @@ static void pager_close(void) { /* Inform pager that we are done */ fclose(stdout); + kill(pager_pid, SIGCONT); wait_for_terminate(pager_pid, &dummy); pager_pid = 0; } @@ -5544,6 +5545,7 @@ static void agent_close(void) { /* Inform agent that we are done */ kill(agent_pid, SIGTERM); + kill(agent_pid, SIGCONT); wait_for_terminate(agent_pid, &dummy); agent_pid = 0; } diff --git a/src/test-cgroup.c b/src/test-cgroup.c index 486656b4..eb189374 100644 --- a/src/test-cgroup.c +++ b/src/test-cgroup.c @@ -61,16 +61,16 @@ int main(int argc, char*argv[]) { assert_se(cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, "/test-a", false) > 0); assert_se(cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, "/test-b", false) == 0); - assert_se(cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, "/test-a", 0, false, false, NULL) == 0); - assert_se(cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, "/test-b", 0, false, false, NULL) > 0); + assert_se(cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, "/test-a", 0, false, false, false, NULL) == 0); + assert_se(cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, "/test-b", 0, false, false, false, NULL) > 0); assert_se(cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, "/test-b", "/test-a", false, false) > 0); assert_se(cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, "/test-a", false) == 0); assert_se(cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, "/test-b", false) > 0); - assert_se(cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, "/test-a", 0, false, false, NULL) > 0); - assert_se(cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, "/test-b", 0, false, false, NULL) == 0); + assert_se(cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, "/test-a", 0, false, false, false, NULL) > 0); + assert_se(cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, "/test-b", 0, false, false, false, NULL) == 0); cg_trim(SYSTEMD_CGROUP_CONTROLLER, "/", false); diff --git a/src/util.c b/src/util.c index e2859faf..23d7e221 100644 --- a/src/util.c +++ b/src/util.c @@ -3977,6 +3977,17 @@ finish: hashmap_free_free(pids); } +int kill_and_sigcont(pid_t pid, int sig) { + int r; + + r = kill(pid, sig) < 0 ? -errno : 0; + + if (r >= 0) + kill(pid, SIGCONT); + + return r; +} + static const char *const ioprio_class_table[] = { [IOPRIO_CLASS_NONE] = "none", [IOPRIO_CLASS_RT] = "realtime", diff --git a/src/util.h b/src/util.h index 7f2cc080..3f3347d5 100644 --- a/src/util.h +++ b/src/util.h @@ -383,6 +383,8 @@ int detect_virtualization(const char **id); void execute_directory(const char *directory, DIR *_d, char *argv[]); +int kill_and_sigcont(pid_t pid, int sig); + #define NULSTR_FOREACH(i, l) \ for ((i) = (l); (i) && *(i); (i) = strchr((i), 0)+1)