X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fcgroup.c;h=8b2ad5b0e9704715afcbca784055ee45e979e365;hp=7397b5298119d156f36dfe2e0724ae7914441861;hb=b363ca6f206258acff8bc0a27dc72a99210011a8;hpb=c6c18be35bb1d300d0b62a568783cc1c477f7151

diff --git a/src/cgroup.c b/src/cgroup.c
index 7397b5298..8b2ad5b0e 100644
--- a/src/cgroup.c
+++ b/src/cgroup.c
@@ -1,4 +1,4 @@
-/*-*- Mode: C; c-basic-offset: 8 -*-*/
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
 /***
   This file is part of systemd.
@@ -138,7 +138,7 @@ int cgroup_bonding_install_list(CGroupBonding *first, pid_t pid) {
         return 0;
 }
 
-int cgroup_bonding_kill(CGroupBonding *b, int sig) {
+int cgroup_bonding_kill(CGroupBonding *b, int sig, Set *s) {
         int r;
 
         assert(b);
@@ -149,25 +149,36 @@ int cgroup_bonding_kill(CGroupBonding *b, int sig) {
 
         assert(b->realized);
 
-        return cg_kill_recursive(b->controller, b->path, sig, true);
+        return cg_kill_recursive(b->controller, b->path, sig, true, false, s);
 }
 
-int cgroup_bonding_kill_list(CGroupBonding *first, int sig) {
+int cgroup_bonding_kill_list(CGroupBonding *first, int sig, Set *s) {
         CGroupBonding *b;
-        int r = -EAGAIN;
+        Set *allocated_set = NULL;
+        int ret = -EAGAIN, r;
+
+        if (!s)
+                if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func)))
+                        return -ENOMEM;
 
         LIST_FOREACH(by_unit, b, first) {
-                if ((r = cgroup_bonding_kill(b, sig)) < 0) {
+                if ((r = cgroup_bonding_kill(b, sig, s)) < 0) {
                         if (r == -EAGAIN || r == -ESRCH)
                                 continue;
 
-                        return r;
+                        ret = r;
+                        goto finish;
                 }
 
-                return 0;
+                if (ret < 0 || r > 0)
+                        ret = r;
         }
 
-        return r;
+finish:
+        if (allocated_set)
+                set_free(allocated_set);
+
+        return ret;
 }
 
 /* Returns 1 if the group is empty, 0 if it is not, -EAGAIN if we
@@ -215,13 +226,7 @@ int manager_setup_cgroup(Manager *m) {
 
         assert(m);
 
-        /* 1. Initialize libcg */
-        if ((r = cg_init()) < 0) {
-                log_error("Failed to initialize libcg: %s", strerror(-r));
-                goto finish;
-        }
-
-        /* 2. Determine hierarchy */
+        /* 1. Determine hierarchy */
         if ((r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, &current)) < 0)
                 goto finish;
 
@@ -237,19 +242,19 @@ int manager_setup_cgroup(Manager *m) {
         } else {
                 /* We need a new root cgroup */
                 m->cgroup_hierarchy = NULL;
-                if ((r = asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix)) < 0) {
+                if (asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix) < 0) {
                         r = -ENOMEM;
                         goto finish;
                 }
         }
 
-        /* 3. Show data */
+        /* 2. Show data */
         if ((r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, NULL, &path)) < 0)
                 goto finish;
 
         log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path);
 
-        /* 4. Install agent */
+        /* 3. Install agent */
         if ((r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, CGROUP_AGENT_PATH)) < 0)
                 log_warning("Failed to install release agent, ignoring: %s", strerror(-r));
         else if (r > 0)
@@ -257,13 +262,13 @@ int manager_setup_cgroup(Manager *m) {
         else
                 log_debug("Release agent already installed.");
 
-        /* 5. Realize the group */
+        /* 4. Realize the group */
         if ((r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, 0)) < 0) {
                 log_error("Failed to create root cgroup hierarchy: %s", strerror(-r));
                 goto finish;
         }
 
-        /* 6. And pin it, so that it cannot be unmounted */
+        /* 5. And pin it, so that it cannot be unmounted */
         if (m->pin_cgroupfs_fd >= 0)
                 close_nointr_nofail(m->pin_cgroupfs_fd);
 
@@ -331,17 +336,31 @@ int cgroup_notify_empty(Manager *m, const char *group) {
 Unit* cgroup_unit_by_pid(Manager *m, pid_t pid) {
         CGroupBonding *l, *b;
         char *group = NULL;
-        int r;
 
         assert(m);
 
         if (pid <= 1)
                 return NULL;
 
-        if ((r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &group)))
+        if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &group) < 0)
                 return NULL;
 
         l = hashmap_get(m->cgroup_bondings, group);
+
+        if (!l) {
+                char *slash;
+
+                while ((slash = strrchr(group, '/'))) {
+                        if (slash == group)
+                                break;
+
+                        *slash = 0;
+
+                        if ((l = hashmap_get(m->cgroup_bondings, group)))
+                                break;
+                }
+        }
+
         free(group);
 
         LIST_FOREACH(by_path, b, l) {
@@ -378,3 +397,54 @@ char *cgroup_bonding_to_string(CGroupBonding *b) {
 
         return r;
 }
+
+pid_t cgroup_bonding_search_main_pid(CGroupBonding *b) {
+        FILE *f;
+        pid_t pid = 0, npid;
+        int r;
+
+        assert(b);
+
+        if (!b->only_us)
+                return 0;
+
+        if ((r = cg_enumerate_processes(b->controller, b->path, &f)) < 0)
+                return 0;
+
+        while ((r = cg_read_pid(f, &npid)) > 0)  {
+
+                if (npid == pid)
+                        continue;
+
+                if (pid != 0) {
+                        /* Dang, there's more than one PID in this
+                         * group, so we don't know what process is the
+                         * main process. */
+                        pid = 0;
+                        break;
+                }
+
+                pid = npid;
+        }
+
+        fclose(f);
+
+        return pid;
+}
+
+pid_t cgroup_bonding_search_main_pid_list(CGroupBonding *first) {
+        CGroupBonding *b;
+        pid_t pid;
+
+        /* Try to find a main pid from this cgroup, but checking if
+         * there's only one PID in the cgroup and returning it. Later
+         * on we might want to add additional, smarter heuristics
+         * here. */
+
+        LIST_FOREACH(by_unit, b, first)
+                if ((pid = cgroup_bonding_search_main_pid(b)) != 0)
+                        return pid;
+
+        return 0;
+
+}