logind: support for hybrid sleep (i.e. suspend+hibernate at the same time)

[elogind.git] / src / shared / cgroup-util.c

diff --git a/src/shared/cgroup-util.c b/src/shared/cgroup-util.c
index 8d3bdce0f576fa2184cf317e4758259b1e22a9e2..b0d378de5ade1e577a0c7f86cd7b294b3e0ec709 100644 (file)
--- a/src/shared/cgroup-util.c
+++ b/src/shared/cgroup-util.c
@@ -522,16 +522,16 @@ static int join_path(const char *controller, const char *path, const char *suffi
 
         if (controller) {
                 if (path && suffix)
-                        t = join("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL);
+                        t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL);
                 else if (path)
-                        t = join("/sys/fs/cgroup/", controller, "/", path, NULL);
+                        t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL);
                 else if (suffix)
-                        t = join("/sys/fs/cgroup/", controller, "/", suffix, NULL);
+                        t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL);
                 else
-                        t = join("/sys/fs/cgroup/", controller, NULL);
+                        t = strjoin("/sys/fs/cgroup/", controller, NULL);
         } else {
                 if (path && suffix)
-                        t = join(path, "/", suffix, NULL);
+                        t = strjoin(path, "/", suffix, NULL);
                 else if (path)
                         t = strdup(path);
         }
@@ -1149,3 +1149,108 @@ char **cg_shorten_controllers(char **controllers) {
         *t = NULL;
         return controllers;
 }
+
+int cg_pid_get_cgroup(pid_t pid, char **root, char **cgroup) {
+        char *cg_process, *cg_init, *p;
+        int r;
+
+        assert(pid >= 0);
+
+        if (pid == 0)
+                pid = getpid();
+
+        r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &cg_process);
+        if (r < 0)
+                return r;
+
+        r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &cg_init);
+        if (r < 0) {
+                free(cg_process);
+                return r;
+        }
+
+        if (endswith(cg_init, "/system"))
+                cg_init[strlen(cg_init)-7] = 0;
+        else if (streq(cg_init, "/"))
+                cg_init[0] = 0;
+
+        if (startswith(cg_process, cg_init))
+                p = cg_process + strlen(cg_init);
+        else
+                p = cg_process;
+
+        free(cg_init);
+
+        if (cgroup) {
+                char* c;
+
+                c = strdup(p);
+                if (!c) {
+                        free(cg_process);
+                        return -ENOMEM;
+                }
+
+                *cgroup = c;
+        }
+
+        if (root) {
+                cg_process[p-cg_process] = 0;
+                *root = cg_process;
+        } else
+                free(cg_process);
+
+        return 0;
+}
+
+int cg_pid_get_unit(pid_t pid, char **unit) {
+        int r;
+        char *cgroup, *p, *at, *b;
+        size_t k;
+
+        assert(pid >= 0);
+        assert(unit);
+
+        r = cg_pid_get_cgroup(pid, NULL, &cgroup);
+        if (r < 0)
+                return r;
+
+        if (!startswith(cgroup, "/system/")) {
+                free(cgroup);
+                return -ENOENT;
+        }
+
+        p = cgroup + 8;
+        k = strcspn(p, "/");
+
+        at = memchr(p, '@', k);
+        if (at && at[1] == '.') {
+                size_t j;
+
+                /* This is a templated service */
+                if (p[k] != '/') {
+                        free(cgroup);
+                        return -EIO;
+                }
+
+                j = strcspn(p+k+1, "/");
+
+                b = malloc(k + j + 1);
+
+                if (b) {
+                        memcpy(b, p, at - p + 1);
+                        memcpy(b + (at - p) + 1, p + k + 1, j);
+                        memcpy(b + (at - p) + 1 + j, at + 1, k - (at - p) - 1);
+                        b[k+j] = 0;
+                }
+        } else
+                  b = strndup(p, k);
+
+        free(cgroup);
+
+        if (!b)
+                return -ENOMEM;
+
+        *unit = b;
+        return 0;
+
+}