X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=manager.c;h=1691719a66b72bd48eea4dfa58331409c0070e09;hb=6e620becc8543e9ea8381fcd779dd932c2464749;hp=f10345b43a9b83563156fa2c4723b5960fb77343;hpb=701cc384c283206a29b21e4e7302e5cf5f2d9433;p=elogind.git diff --git a/manager.c b/manager.c index f10345b43..1691719a6 100644 --- a/manager.c +++ b/manager.c @@ -395,42 +395,70 @@ static unsigned manager_dispatch_cleanup_queue(Manager *m) { return n; } -static void unit_gc_sweep(Unit *u, int gc_marker) { +enum { + GC_OFFSET_IN_PATH, /* This one is on the path we were travelling */ + GC_OFFSET_UNSURE, /* No clue */ + GC_OFFSET_GOOD, /* We still need this unit */ + GC_OFFSET_BAD, /* We don't need this unit anymore */ + _GC_OFFSET_MAX +}; + +static void unit_gc_sweep(Unit *u, unsigned gc_marker) { Iterator i; Unit *other; + bool is_bad; assert(u); - if (u->meta.gc_marker == gc_marker || - u->meta.gc_marker == -gc_marker) + if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD || + u->meta.gc_marker == gc_marker + GC_OFFSET_BAD || + u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH) return; - if (!u->meta.in_cleanup_queue) + if (u->meta.in_cleanup_queue) goto bad; if (unit_check_gc(u)) goto good; + u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH; + + is_bad = true; + SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) { unit_gc_sweep(other, gc_marker); - if (other->meta.gc_marker == gc_marker) + if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD) goto good; + + if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD) + is_bad = false; } + if (is_bad) + goto bad; + + /* We were unable to find anything out about this entry, so + * let's investigate it later */ + u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE; + unit_add_to_gc_queue(u); + return; + bad: - /* So there is no reason to keep this unit around, hence let's get rid of it */ - u->meta.gc_marker = -gc_marker; + /* We definitely know that this one is not useful anymore, so + * let's mark it for deletion */ + u->meta.gc_marker = gc_marker + GC_OFFSET_BAD; + unit_add_to_cleanup_queue(u); return; good: - u->meta.gc_marker = gc_marker; + u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD; } static unsigned manager_dispatch_gc_queue(Manager *m) { Meta *meta; unsigned n = 0; - int gc_marker; + unsigned gc_marker; assert(m); @@ -441,21 +469,26 @@ static unsigned manager_dispatch_gc_queue(Manager *m) { log_debug("Running GC..."); + m->gc_marker += _GC_OFFSET_MAX; + if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX) + m->gc_marker = 1; + gc_marker = m->gc_marker; - m->gc_marker = MIN(0, m->gc_marker + 1); while ((meta = m->gc_queue)) { assert(meta->in_gc_queue); + unit_gc_sweep(UNIT(meta), gc_marker); + LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta); meta->in_gc_queue = false; n++; - unit_gc_sweep(UNIT(meta), gc_marker); - - if (meta->gc_marker == -gc_marker) { + if (meta->gc_marker == gc_marker + GC_OFFSET_BAD || + meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) { log_debug("Collecting %s", meta->id); + meta->gc_marker = gc_marker + GC_OFFSET_BAD; unit_add_to_cleanup_queue(UNIT(meta)); } } @@ -1002,7 +1035,7 @@ static void transaction_collect_garbage(Manager *m) { } while (again); } -static int transaction_is_destructive(Manager *m, JobMode mode) { +static int transaction_is_destructive(Manager *m) { Iterator i; Job *j; @@ -1081,7 +1114,7 @@ static void transaction_minimize_impact(Manager *m) { } while (again); } -static int transaction_apply(Manager *m, JobMode mode) { +static int transaction_apply(Manager *m) { Iterator i; Job *j; int r; @@ -1201,13 +1234,13 @@ static int transaction_activate(Manager *m, JobMode mode) { /* Ninth step: check whether we can actually apply this */ if (mode == JOB_FAIL) - if ((r = transaction_is_destructive(m, mode)) < 0) { + if ((r = transaction_is_destructive(m)) < 0) { log_debug("Requested transaction contradicts existing jobs: %s", strerror(-r)); goto rollback; } /* Tenth step: apply changes */ - if ((r = transaction_apply(m, mode)) < 0) { + if ((r = transaction_apply(m)) < 0) { log_debug("Failed to apply transaction: %s", strerror(-r)); goto rollback; } @@ -1381,6 +1414,38 @@ fail: return r; } +static int transaction_add_isolate_jobs(Manager *m) { + Iterator i; + Unit *u; + char *k; + int r; + + assert(m); + + HASHMAP_FOREACH_KEY(u, k, m->units, i) { + + /* ignore aliases */ + if (u->meta.id != k) + continue; + + if (UNIT_VTABLE(u)->no_isolate) + continue; + + /* No need to stop inactive jobs */ + if (unit_active_state(u) == UNIT_INACTIVE) + continue; + + /* Is there already something listed for this? */ + if (hashmap_get(m->transaction_jobs, u)) + continue; + + if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, NULL)) < 0) + log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r)); + } + + return 0; +} + int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, Job **_ret) { int r; Job *ret; @@ -1390,6 +1455,9 @@ int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool ove assert(unit); assert(mode < _JOB_MODE_MAX); + if (mode == JOB_ISOLATE && type != JOB_START) + return -EINVAL; + log_debug("Trying to enqueue job %s/%s", unit->meta.id, job_type_to_string(type)); if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, &ret)) < 0) { @@ -1397,6 +1465,12 @@ int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool ove return r; } + if (mode == JOB_ISOLATE) + if ((r = transaction_add_isolate_jobs(m)) < 0) { + transaction_abort(m); + return r; + } + if ((r = transaction_activate(m, mode)) < 0) return r; @@ -1462,15 +1536,15 @@ unsigned manager_dispatch_load_queue(Manager *m) { return n; } -int manager_load_unit(Manager *m, const char *name, const char *path, Unit **_ret) { +int manager_load_unit_prepare(Manager *m, const char *name, const char *path, Unit **_ret) { Unit *ret; int r; assert(m); assert(name || path); - /* This will load the service information files, but not actually - * start any services or anything. */ + /* This will prepare the unit for loading, but not actually + * load anything from disk. */ if (path && !is_path(path)) return -EINVAL; @@ -1503,6 +1577,24 @@ int manager_load_unit(Manager *m, const char *name, const char *path, Unit **_re unit_add_to_load_queue(ret); unit_add_to_dbus_queue(ret); + if (_ret) + *_ret = ret; + + return 0; +} + +int manager_load_unit(Manager *m, const char *name, const char *path, Unit **_ret) { + Unit *ret; + int r; + + assert(m); + + /* This will load the service information files, but not actually + * start any services or anything. */ + + if ((r = manager_load_unit_prepare(m, name, path, &ret)) < 0) + return r; + manager_dispatch_load_queue(m); if (_ret) @@ -1691,9 +1783,17 @@ static int manager_process_signal_fd(Manager *m) { sigchld = true; break; - case SIGINT: case SIGTERM: + if (m->running_as == MANAGER_INIT) + /* This is for compatibility with the + * original sysvinit */ + m->exit_code = MANAGER_REEXECUTE; + else + m->exit_code = MANAGER_EXIT; + + return 0; + case SIGINT: if (m->running_as == MANAGER_INIT) { manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET); break; @@ -1703,7 +1803,6 @@ static int manager_process_signal_fd(Manager *m) { return 0; case SIGWINCH: - if (m->running_as == MANAGER_INIT) manager_start_target(m, SPECIAL_KBREQUEST_TARGET); @@ -1717,12 +1816,7 @@ static int manager_process_signal_fd(Manager *m) { /* This is a nop on non-init */ break; - case SIGUSR1: - manager_dump_units(m, stdout, "\t"); - manager_dump_jobs(m, stdout, "\t"); - break; - - case SIGUSR2: { + case SIGUSR1: { Unit *u; u = manager_get_unit(m, SPECIAL_DBUS_SERVICE); @@ -1741,6 +1835,11 @@ static int manager_process_signal_fd(Manager *m) { break; } + case SIGUSR2: + manager_dump_units(m, stdout, "\t"); + manager_dump_jobs(m, stdout, "\t"); + break; + case SIGHUP: m->exit_code = MANAGER_RELOAD; break; @@ -1864,7 +1963,7 @@ int manager_loop(Manager *m) { if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) { - if (errno == -EINTR) + if (errno == EINTR) continue; return -errno;