shaba/systemd
1
0
Fork 0
mirror of https://github.com/systemd/systemd.git synced 2024-12-23 21:35:11 +03:00
Code

cgroup: make cg_pid_get_path() work properly for co-mounted controllers and normalized named hierarchies

Browse Source
This commit is contained in:
Lennart Poettering 2013-04-29 20:22:36 -03:00
parent 5f1dac6bf6
commit 8af8afd6b3
2 changed files with 34 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
TODO
View File

@ -26,8 +26,6 @@ Fedora 19:
Features:
* handle named vs controller hierarchies correctly in cg_pid_get_path()
* add nspawn@.service
* investigate endianess issues of UUID vs. GUID
@ -59,8 +57,6 @@ Features:
* cgtop: make cgtop useful in a container
* make sure cg_pid_get_path() works properly for co-mounted controllers
* test/:
- add 'set -e' to scripts in test/
- make stuff in test/ work with separate output dir

44
src/shared/cgroup-util.c
View File

@ -736,24 +736,27 @@ int cg_set_task_access(
}
int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
char fs[sizeof("/proc/") - 1 + DECIMAL_STR_MAX(pid_t) + sizeof("/cgroup")];
_cleanup_fclose_ FILE *f = NULL;
char line[LINE_MAX];
const char *fs;
size_t cs;
assert(path);
assert(pid >= 0);
if (controller && !cg_controller_is_valid(controller, true))
return -EINVAL;
if (controller) {
if (!cg_controller_is_valid(controller, true))
return -EINVAL;
if (!controller)
controller = normalize_controller(controller);
} else
controller = SYSTEMD_CGROUP_CONTROLLER;
if (pid == 0)
pid = getpid();
fs = "/proc/self/cgroup";
else
fs = procfs_file_alloca(pid, "cgroup");
sprintf(fs, "/proc/%lu/cgroup", (unsigned long) pid);
f = fopen(fs, "re");
if (!f)
return errno == ENOENT ? -ESRCH : -errno;
@ -761,7 +764,10 @@ 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;
char *l, *p, *w, *e;
size_t k;
char *state;
bool found = false;
truncate_nl(line);
@ -770,13 +776,31 @@ int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
continue;
l++;
if (!strneq(l, controller, cs))
e = strchr(l, ':');
if (!e)
continue;
if (l[cs] != ':')
*e = 0;
FOREACH_WORD_SEPARATOR(w, k, l, ",", state) {
if (k == cs && memcmp(w, controller, cs) == 0) {
found = true;
break;
}
if (k == 5 + cs &&
memcmp(w, "name=", 5) == 0 &&
memcmp(w+5, controller, cs) == 0) {
found = true;
break;
}
}
if (!found)
continue;
p = strdup(l + cs + 1);
p = strdup(e + 1);
if (!p)
return -ENOMEM;