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cgroup-util: Don't send SIGCONT after SIGKILL
[elogind.git] / src / shared / cgroup-util.c
diff --git a/src/shared/cgroup-util.c b/src/shared/cgroup-util.c
index f2af8dcfda57ccde25b92c77fff40f91efa9f6b4..e595d895d29afe94cbb71bd9e7c5d41dc95e2ace 100644 (file)
--- a/src/shared/cgroup-util.c
+++ b/src/shared/cgroup-util.c
@@ -161,7 +161,7 @@ int cg_kill(const char *controller, const char *path, int sig, bool sigcont, boo
          * tasks list, to properly handle forking processes */
 
         if (!s) {
-                s = allocated_set = set_new(trivial_hash_func, trivial_compare_func);
+                s = allocated_set = set_new(NULL);
                 if (!s)
                         return -ENOMEM;
         }
@@ -194,12 +194,12 @@ int cg_kill(const char *controller, const char *path, int sig, bool sigcont, boo
                         if (kill(pid, sig) < 0) {
                                 if (ret >= 0 && errno != ESRCH)
                                         ret = -errno;
-                        } else if (ret == 0) {
-
-                                if (sigcont)
+                        } else {
+                                if (sigcont && sig != SIGKILL)
                                         kill(pid, SIGCONT);
 
-                                ret = 1;
+                                if (ret == 0)
+                                        ret = 1;
                         }
 
                         done = false;
@@ -239,7 +239,7 @@ int cg_kill_recursive(const char *controller, const char *path, int sig, bool si
         assert(sig >= 0);
 
         if (!s) {
-                s = allocated_set = set_new(trivial_hash_func, trivial_compare_func);
+                s = allocated_set = set_new(NULL);
                 if (!s)
                         return -ENOMEM;
         }
@@ -290,7 +290,7 @@ int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char
         assert(cto);
         assert(pto);
 
-        s = set_new(trivial_hash_func, trivial_compare_func);
+        s = set_new(NULL);
         if (!s)
                 return -ENOMEM;
 
@@ -472,9 +472,7 @@ static int join_path(const char *controller, const char *path, const char *suffi
         if (!t)
                 return -ENOMEM;
 
-        path_kill_slashes(t);
-
-        *fs = t;
+        *fs = path_kill_slashes(t);
         return 0;
 }
 
@@ -509,7 +507,7 @@ static int check_hierarchy(const char *p) {
         assert(p);
 
         /* Check if this controller actually really exists */
-        cc = alloca(sizeof("/sys/fs/cgroup/") + strlen(p));
+        cc = alloca(strlen("/sys/fs/cgroup/") + strlen(p) + 1);
         strcpy(stpcpy(cc, "/sys/fs/cgroup/"), p);
         if (access(cc, F_OK) < 0)
                 return -errno;
@@ -643,9 +641,9 @@ int cg_attach(const char *controller, const char *path, pid_t pid) {
         if (pid == 0)
                 pid = getpid();
 
-        snprintf(c, sizeof(c), "%lu\n", (unsigned long) pid);
+        snprintf(c, sizeof(c), PID_FMT"\n", pid);
 
-        return write_string_file(fs, c);
+        return write_string_file_no_create(fs, c);
 }
 
 int cg_attach_fallback(const char *controller, const char *path, pid_t pid) {
@@ -684,7 +682,7 @@ int cg_set_group_access(
 
         assert(path);
 
-        if (mode != (mode_t) -1)
+        if (mode != MODE_INVALID)
                 mode &= 0777;
 
         r = cg_get_path(controller, path, NULL, &fs);
@@ -706,10 +704,10 @@ int cg_set_task_access(
 
         assert(path);
 
-        if (mode == (mode_t) -1 && uid == (uid_t) -1 && gid == (gid_t) -1)
+        if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID)
                 return 0;
 
-        if (mode != (mode_t) -1)
+        if (mode != MODE_INVALID)
                 mode &= 0666;
 
         r = cg_get_path(controller, path, "cgroup.procs", &fs);
@@ -746,10 +744,7 @@ int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
         } else
                 controller = SYSTEMD_CGROUP_CONTROLLER;
 
-        if (pid == 0)
-                fs = "/proc/self/cgroup";
-        else
-                fs = procfs_file_alloca(pid, "cgroup");
+        fs = procfs_file_alloca(pid, "cgroup");
 
         f = fopen(fs, "re");
         if (!f)
@@ -758,9 +753,9 @@ int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
         cs = strlen(controller);
 
         FOREACH_LINE(line, f, return -errno) {
-                char *l, *p, *w, *e;
+                char *l, *p, *e;
                 size_t k;
-                char *state;
+                const char *word, *state;
                 bool found = false;
 
                 truncate_nl(line);
@@ -776,16 +771,16 @@ int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
 
                 *e = 0;
 
-                FOREACH_WORD_SEPARATOR(w, k, l, ",", state) {
+                FOREACH_WORD_SEPARATOR(word, k, l, ",", state) {
 
-                        if (k == cs && memcmp(w, controller, cs) == 0) {
+                        if (k == cs && memcmp(word, controller, cs) == 0) {
                                 found = true;
                                 break;
                         }
 
                         if (k == 5 + cs &&
-                            memcmp(w, "name=", 5) == 0 &&
-                            memcmp(w+5, controller, cs) == 0) {
+                            memcmp(word, "name=", 5) == 0 &&
+                            memcmp(word+5, controller, cs) == 0) {
                                 found = true;
                                 break;
                         }
@@ -822,7 +817,7 @@ int cg_install_release_agent(const char *controller, const char *agent) {
 
         sc = strstrip(contents);
         if (sc[0] == 0) {
-                r = write_string_file(fs, agent);
+                r = write_string_file_no_create(fs, agent);
                 if (r < 0)
                         return r;
         } else if (!streq(sc, agent))
@@ -842,7 +837,7 @@ int cg_install_release_agent(const char *controller, const char *agent) {
 
         sc = strstrip(contents);
         if (streq(sc, "0")) {
-                r = write_string_file(fs, "1");
+                r = write_string_file_no_create(fs, "1");
                 if (r < 0)
                         return r;
 
@@ -863,7 +858,7 @@ int cg_uninstall_release_agent(const char *controller) {
         if (r < 0)
                 return r;
 
-        r = write_string_file(fs, "0");
+        r = write_string_file_no_create(fs, "0");
         if (r < 0)
                 return r;
 
@@ -874,7 +869,7 @@ int cg_uninstall_release_agent(const char *controller) {
         if (r < 0)
                 return r;
 
-        r = write_string_file(fs, "");
+        r = write_string_file_no_create(fs, "");
         if (r < 0)
                 return r;
 
@@ -960,8 +955,7 @@ int cg_split_spec(const char *spec, char **controller, char **path) {
                         if (!t)
                                 return -ENOMEM;
 
-                        path_kill_slashes(t);
-                        *path = t;
+                        *path = path_kill_slashes(t);
                 }
 
                 if (controller)
@@ -1044,19 +1038,18 @@ int cg_mangle_path(const char *path, char **result) {
         assert(path);
         assert(result);
 
-        /* First check if it already is a filesystem path */
+        /* First, check if it already is a filesystem path */
         if (path_startswith(path, "/sys/fs/cgroup")) {
 
                 t = strdup(path);
                 if (!t)
                         return -ENOMEM;
 
-                path_kill_slashes(t);
-                *result = t;
+                *result = path_kill_slashes(t);
                 return 0;
         }
 
-        /* Otherwise treat it as cg spec */
+        /* Otherwise, treat it as cg spec */
         r = cg_split_spec(path, &c, &p);
         if (r < 0)
                 return r;
@@ -1285,39 +1278,18 @@ int cg_pid_get_user_unit(pid_t pid, char **unit) {
 }
 
 int cg_path_get_machine_name(const char *path, char **machine) {
-        const char *e, *n, *x;
-        char *s, *r;
-        size_t l;
-
-        assert(path);
-        assert(machine);
-
-        /* Skip slices, if there are any */
-        e = skip_slices(path);
-
-        n = strchrnul(e, '/');
-        if (e == n)
-                return -ENOENT;
-
-        s = strndupa(e, n - e);
-        s = cg_unescape(s);
-
-        x = startswith(s, "machine-");
-        if (!x)
-                return -ENOENT;
-        if (!endswith(x, ".scope"))
-                return -ENOENT;
+        _cleanup_free_ char *u = NULL, *sl = NULL;
+        int r;
 
-        l = strlen(x);
-        if (l <= 6)
-                return -ENOENT;
+        r = cg_path_get_unit(path, &u);
+        if (r < 0)
+                return r;
 
-        r = strndup(x, l - 6);
-        if (!r)
+        sl = strjoin("/run/systemd/machines/unit:", u, NULL);
+        if (!sl)
                 return -ENOMEM;
 
-        *machine = r;
-        return 0;
+        return readlink_malloc(sl, machine);
 }
 
 int cg_pid_get_machine_name(pid_t pid, char **machine) {
@@ -1334,12 +1306,10 @@ int cg_pid_get_machine_name(pid_t pid, char **machine) {
 }
 
 int cg_path_get_session(const char *path, char **session) {
-        const char *e, *n, *x;
-        char *s, *r;
-        size_t l;
+        const char *e, *n, *x, *y;
+        char *s;
 
         assert(path);
-        assert(session);
 
         /* Skip slices, if there are any */
         e = skip_slices(path);
@@ -1354,18 +1324,20 @@ int cg_path_get_session(const char *path, char **session) {
         x = startswith(s, "session-");
         if (!x)
                 return -ENOENT;
-        if (!endswith(x, ".scope"))
+        y = endswith(x, ".scope");
+        if (!y || x == y)
                 return -ENOENT;
 
-        l = strlen(x);
-        if (l <= 6)
-                return -ENOENT;
+        if (session) {
+                char *r;
 
-        r = strndup(x, l - 6);
-        if (!r)
-                return -ENOMEM;
+                r = strndup(x, y - x);
+                if (!r)
+                        return -ENOMEM;
+
+                *session = r;
+        }
 
-        *session = r;
         return 0;
 }
 
@@ -1373,8 +1345,6 @@ int cg_pid_get_session(pid_t pid, char **session) {
         _cleanup_free_ char *cgroup = NULL;
         int r;
 
-        assert(session);
-
         r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
         if (r < 0)
                 return r;
@@ -1617,7 +1587,7 @@ int cg_set_attribute(const char *controller, const char *path, const char *attri
         if (r < 0)
                 return r;
 
-        return write_string_file(p, value);
+        return write_string_file_no_create(p, value);
 }
 
 static const char mask_names[] =
@@ -1690,7 +1660,7 @@ int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path,
         return r;
 }
 
-int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to) {
+int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) {
         CGroupControllerMask bit = 1;
         const char *n;
         int r;
@@ -1702,8 +1672,17 @@ int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, cons
         }
 
         NULSTR_FOREACH(n, mask_names) {
-                if (supported & bit)
-                        cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, to, false, false);
+                if (supported & bit) {
+                        const char *p = NULL;
+
+                        if (to_callback)
+                                p = to_callback(bit, userdata);
+
+                        if (!p)
+                                p = to;
+
+                        cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, p, false, false);
+                }
 
                 bit <<= 1;
         }
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