#include <ftw.h>
#include "cgroup-util.h"
-#include "log.h"
#include "set.h"
#include "macro.h"
#include "util.h"
#include "path-util.h"
-#include "strv.h"
#include "unit-name.h"
#include "fileio.h"
#include "special.h"
}
static int check_hierarchy(const char *p) {
- char *cc;
+ const char *cc;
assert(p);
+ if (!filename_is_valid(p))
+ return 0;
+
/* Check if this controller actually really exists */
- cc = alloca(strlen("/sys/fs/cgroup/") + strlen(p) + 1);
- strcpy(stpcpy(cc, "/sys/fs/cgroup/"), p);
- if (access(cc, F_OK) < 0)
+ cc = strjoina("/sys/fs/cgroup/", p);
+ if (laccess(cc, F_OK) < 0)
return -errno;
return 0;
/* Skip slices, if there are any */
e = skip_slices(path);
- /* Skip the session scope... */
+ /* Skip the session scope or user manager... */
t = skip_session(e);
- if (t)
- /* ... and skip more slices if there's one */
- e = skip_slices(t);
- else {
- /* ... or require a user manager unit to be there */
- e = skip_user_manager(e);
- if (!e)
- return -ENOENT;
- }
+ if (!t)
+ t = skip_user_manager(e);
+ if (!t)
+ return -ENOENT;
+
+ /* ... and skip more slices if there are any */
+ e = skip_slices(t);
return cg_path_decode_unit(e, unit);
}
return write_string_file_no_create(p, value);
}
+int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) {
+ _cleanup_free_ char *p = NULL;
+ int r;
+
+ r = cg_get_path(controller, path, attribute, &p);
+ if (r < 0)
+ return r;
+
+ return read_one_line_file(p, ret);
+}
+
static const char mask_names[] =
"cpu\0"
"cpuacct\0"
return mask;
}
+
+int cg_kernel_controllers(Set *controllers) {
+ _cleanup_fclose_ FILE *f = NULL;
+ char buf[LINE_MAX];
+ int r;
+
+ assert(controllers);
+
+ f = fopen("/proc/cgroups", "re");
+ if (!f) {
+ if (errno == ENOENT)
+ return 0;
+ return -errno;
+ }
+
+ /* Ignore the header line */
+ (void) fgets(buf, sizeof(buf), f);
+
+ for (;;) {
+ char *controller;
+ int enabled = 0;
+
+ errno = 0;
+ if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) {
+
+ if (feof(f))
+ break;
+
+ if (ferror(f) && errno)
+ return -errno;
+
+ return -EBADMSG;
+ }
+
+ if (!enabled) {
+ free(controller);
+ continue;
+ }
+
+ if (!filename_is_valid(controller)) {
+ free(controller);
+ return -EBADMSG;
+ }
+
+ r = set_consume(controllers, controller);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}