X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fcore%2Funit.c;h=6e1c112124146f8f39f1dcfc46cf3981bf2ebc16;hp=0ad679ba622f6154f742a9cacee2a794c1872a24;hb=8190da36f71a887945297cd65d6426c78b466a50;hpb=58ea275a68cd242ad60161bcb7582614d1d89f13 diff --git a/src/core/unit.c b/src/core/unit.c index 0ad679ba6..6e1c11212 100644 --- a/src/core/unit.c +++ b/src/core/unit.c @@ -50,6 +50,7 @@ #include "bus-errors.h" #include "dbus.h" #include "execute.h" +#include "virt.h" const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = { [UNIT_SERVICE] = &service_vtable, @@ -481,6 +482,8 @@ void unit_free(Unit *u) { set_free_free(u->names); + unit_unwatch_all_pids(u); + condition_free_list(u->conditions); unit_ref_unset(&u->slice); @@ -1696,13 +1699,25 @@ void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_su } int unit_watch_pid(Unit *u, pid_t pid) { + int q, r; + assert(u); assert(pid >= 1); + r = set_ensure_allocated(&u->pids, trivial_hash_func, trivial_compare_func); + if (r < 0) + return r; + /* Watch a specific PID. We only support one unit watching * each PID for now. */ - return hashmap_put(u->manager->watch_pids, LONG_TO_PTR(pid), u); + r = set_put(u->pids, LONG_TO_PTR(pid)); + + q = hashmap_put(u->manager->watch_pids, LONG_TO_PTR(pid), u); + if (q < 0) + return q; + + return r; } void unit_unwatch_pid(Unit *u, pid_t pid) { @@ -1710,6 +1725,102 @@ void unit_unwatch_pid(Unit *u, pid_t pid) { assert(pid >= 1); hashmap_remove_value(u->manager->watch_pids, LONG_TO_PTR(pid), u); + set_remove(u->pids, LONG_TO_PTR(pid)); +} + +static int watch_pids_in_path(Unit *u, const char *path) { + _cleanup_closedir_ DIR *d = NULL; + _cleanup_fclose_ FILE *f = NULL; + int ret = 0, r; + + assert(u); + assert(path); + + /* Adds all PIDs from a specific cgroup path to the set of PIDs we watch. */ + + r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f); + if (r >= 0) { + pid_t pid; + + while ((r = cg_read_pid(f, &pid)) > 0) { + r = unit_watch_pid(u, pid); + if (r < 0 && ret >= 0) + ret = r; + } + if (r < 0 && ret >= 0) + ret = r; + + } else if (ret >= 0) + ret = r; + + r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d); + if (r >= 0) { + char *fn; + + while ((r = cg_read_subgroup(d, &fn)) > 0) { + _cleanup_free_ char *p = NULL; + + p = strjoin(path, "/", fn, NULL); + free(fn); + + if (!p) + return -ENOMEM; + + r = watch_pids_in_path(u, p); + if (r < 0 && ret >= 0) + ret = r; + } + if (r < 0 && ret >= 0) + ret = r; + + } else if (ret >= 0) + ret = r; + + return ret; +} + + +int unit_watch_all_pids(Unit *u) { + assert(u); + + if (!u->cgroup_path) + return -ENOENT; + + /* Adds all PIDs from our cgroup to the set of PIDs we watch */ + + return watch_pids_in_path(u, u->cgroup_path); +} + +void unit_unwatch_all_pids(Unit *u) { + Iterator i; + void *e; + + assert(u); + + SET_FOREACH(e, u->pids, i) + hashmap_remove_value(u->manager->watch_pids, e, u); + + set_free(u->pids); + u->pids = NULL; +} + +void unit_tidy_watch_pids(Unit *u, pid_t except1, pid_t except2) { + Iterator i; + void *e; + + assert(u); + + /* Cleans dead PIDs from our list */ + + SET_FOREACH(e, u->pids, i) { + pid_t pid = PTR_TO_LONG(e); + + if (pid == except1 || pid == except2) + continue; + + if (kill(pid, 0) < 0 && errno == ESRCH) + set_remove(u->pids, e); + } } bool unit_job_is_applicable(Unit *u, JobType j) { @@ -2921,7 +3032,7 @@ int unit_kill_context( pid_t control_pid, bool main_pid_alien) { - int sig, wait_for_exit = 0, r; + int sig, wait_for_exit = false, r; assert(u); assert(c); @@ -2938,12 +3049,12 @@ int unit_kill_context( _cleanup_free_ char *comm = NULL; get_process_comm(main_pid, &comm); - log_warning_unit(u->id, "Failed to kill main process %li (%s): %s", - (long) main_pid, strna(comm), strerror(-r)); + log_warning_unit(u->id, "Failed to kill main process " PID_FMT " (%s): %s", main_pid, strna(comm), strerror(-r)); } else { - wait_for_exit = !main_pid_alien; + if (!main_pid_alien) + wait_for_exit = true; - if (c->send_sighup) + if (c->send_sighup && !sigkill) kill(main_pid, SIGHUP); } } @@ -2955,13 +3066,11 @@ int unit_kill_context( _cleanup_free_ char *comm = NULL; get_process_comm(control_pid, &comm); - log_warning_unit(u->id, - "Failed to kill control process %li (%s): %s", - (long) control_pid, strna(comm), strerror(-r)); + log_warning_unit(u->id, "Failed to kill control process " PID_FMT " (%s): %s", control_pid, strna(comm), strerror(-r)); } else { wait_for_exit = true; - if (c->send_sighup) + if (c->send_sighup && !sigkill) kill(control_pid, SIGHUP); } } @@ -2979,16 +3088,17 @@ int unit_kill_context( if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) log_warning_unit(u->id, "Failed to kill control group: %s", strerror(-r)); } else if (r > 0) { + wait_for_exit = true; - if (c->send_sighup) { + if (c->send_sighup && !sigkill) { set_free(pid_set); pid_set = unit_pid_set(main_pid, control_pid); if (!pid_set) return -ENOMEM; - cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, SIGHUP, true, true, false, pid_set); + cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, SIGHUP, false, true, false, pid_set); } } }