X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fcgroup-util.c;h=fd0ac98e28faad081e1b2faa17425b592f2e9ea7;hp=2167cdd6d052c2a8954747b6572f2d2e0793b095;hb=3bfc71846c3eac9011f0182b0c8d5639a9549228;hpb=ca949c9dcf17ea8d6512ac4c5c1a806ded9b8dc1;ds=sidebyside diff --git a/src/cgroup-util.c b/src/cgroup-util.c index 2167cdd6d..fd0ac98e2 100644 --- a/src/cgroup-util.c +++ b/src/cgroup-util.c @@ -166,7 +166,7 @@ int cg_rmdir(const char *controller, const char *path) { return r < 0 ? -errno : 0; } -int cg_kill(const char *controller, const char *path, int sig, bool ignore_self, Set *s) { +int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s) { bool done = false; int r, ret = 0; pid_t my_pid; @@ -188,7 +188,7 @@ int cg_kill(const char *controller, const char *path, int sig, bool ignore_self, my_pid = getpid(); do { - pid_t pid; + pid_t pid = 0; done = true; if ((r = cg_enumerate_processes(controller, path, &f)) < 0) { @@ -211,8 +211,13 @@ int cg_kill(const char *controller, const char *path, int sig, bool ignore_self, if (kill(pid, sig) < 0) { if (ret >= 0 && errno != ESRCH) ret = -errno; - } else if (ret == 0) + } else if (ret == 0) { + + if (sigcont) + kill(pid, SIGCONT); + ret = 1; + } done = false; @@ -250,7 +255,7 @@ finish: return ret; } -int cg_kill_recursive(const char *controller, const char *path, int sig, bool ignore_self, bool rem, Set *s) { +int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) { int r, ret = 0; DIR *d = NULL; char *fn; @@ -264,7 +269,7 @@ int cg_kill_recursive(const char *controller, const char *path, int sig, bool ig if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func))) return -ENOMEM; - ret = cg_kill(controller, path, sig, ignore_self, s); + ret = cg_kill(controller, path, sig, sigcont, ignore_self, s); if ((r = cg_enumerate_subgroups(controller, path, &d)) < 0) { if (ret >= 0 && r != -ENOENT) @@ -286,7 +291,7 @@ int cg_kill_recursive(const char *controller, const char *path, int sig, bool ig goto finish; } - r = cg_kill_recursive(controller, p, sig, ignore_self, rem, s); + r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s); free(p); if (r != 0 && ret >= 0) @@ -298,7 +303,9 @@ int cg_kill_recursive(const char *controller, const char *path, int sig, bool ig if (rem) if ((r = cg_rmdir(controller, path)) < 0) { - if (ret >= 0 && r != -ENOENT) + if (ret >= 0 && + r != -ENOENT && + r != -EBUSY) ret = r; } @@ -319,24 +326,25 @@ int cg_kill_recursive_and_wait(const char *controller, const char *path, bool re assert(controller); /* This safely kills all processes; first it sends a SIGTERM, - * then checks 8 times after 50ms whether the group is - * now empty, and finally kills everything that is left with - * SIGKILL */ + * then checks 8 times after 200ms whether the group is now + * empty, then kills everything that is left with SIGKILL and + * finally checks 5 times after 200ms each whether the group + * is finally empty. */ - for (i = 0; i < 10; i++) { + for (i = 0; i < 15; i++) { int sig, r; if (i <= 0) sig = SIGTERM; - else if (i >= 9) + else if (i == 9) sig = SIGKILL; else sig = 0; - if ((r = cg_kill_recursive(controller, path, sig, true, rem, NULL)) <= 0) + if ((r = cg_kill_recursive(controller, path, sig, true, true, rem, NULL)) <= 0) return r; - usleep(50 * USEC_PER_MSEC); + usleep(200 * USEC_PER_MSEC); } return 0; @@ -359,7 +367,7 @@ int cg_migrate(const char *controller, const char *from, const char *to, bool ig my_pid = getpid(); do { - pid_t pid; + pid_t pid = 0; done = true; if ((r = cg_enumerate_tasks(controller, from, &f)) < 0) { @@ -459,7 +467,9 @@ int cg_migrate_recursive(const char *controller, const char *from, const char *t if (rem) if ((r = cg_rmdir(controller, from)) < 0) { - if (ret >= 0 && r != -ENOENT) + if (ret >= 0 && + r != -ENOENT && + r != -EBUSY) ret = r; } @@ -472,12 +482,26 @@ finish: int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) { const char *p; - char *mp; - int r; + char *t; + static __thread bool good = false; assert(controller); assert(fs); + if (_unlikely_(!good)) { + int r; + + r = path_is_mount_point("/sys/fs/cgroup"); + if (r <= 0) + return r < 0 ? r : -ENOENT; + + /* Cache this to save a few stat()s */ + good = true; + } + + if (isempty(controller)) + return -EINVAL; + /* This is a very minimal lookup from controller names to * paths. Since we have mounted most hierarchies ourselves * should be kinda safe, but eventually we might want to @@ -491,29 +515,22 @@ int cg_get_path(const char *controller, const char *path, const char *suffix, ch else p = controller; - if (asprintf(&mp, "/sys/fs/cgroup/%s", p) < 0) - return -ENOMEM; - - if ((r = path_is_mount_point(mp)) <= 0) { - free(mp); - return r < 0 ? r : -ENOENT; - } - if (path && suffix) - r = asprintf(fs, "%s/%s/%s", mp, path, suffix); + t = join("/sys/fs/cgroup/", p, "/", path, "/", suffix, NULL); else if (path) - r = asprintf(fs, "%s/%s", mp, path); + t = join("/sys/fs/cgroup/", p, "/", path, NULL); else if (suffix) - r = asprintf(fs, "%s/%s", mp, suffix); - else { - path_kill_slashes(mp); - *fs = mp; - return 0; - } + t = join("/sys/fs/cgroup/", p, "/", suffix, NULL); + else + t = join("/sys/fs/cgroup/", p, NULL); + + if (!t) + return -ENOMEM; - free(mp); - path_kill_slashes(*fs); - return r < 0 ? -ENOMEM : 0; + path_kill_slashes(t); + + *fs = t; + return 0; } int cg_trim(const char *controller, const char *path, bool delete_root) { @@ -777,9 +794,9 @@ finish: } int cg_is_empty(const char *controller, const char *path, bool ignore_self) { - pid_t pid; + pid_t pid = 0; int r; - FILE *f; + FILE *f = NULL; bool found = false; assert(controller); @@ -957,3 +974,31 @@ int cg_fix_path(const char *path, char **result) { return r; } + +int cg_get_user_path(char **path) { + char *root, *p; + + assert(path); + + /* Figure out the place to put user cgroups below. We use the + * same as PID 1 has but with the "/system" suffix replaced by + * "/user" */ + + if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &root) < 0) + p = strdup("/user"); + else { + if (endswith(root, "/system")) + root[strlen(root) - 7] = 0; + else if (streq(root, "/")) + root[0] = 0; + + p = strappend(root, "/user"); + free(root); + } + + if (!p) + return -ENOMEM; + + *path = p; + return 0; +}