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-rw-r--r--api.c70
1 files changed, 62 insertions, 8 deletions
diff --git a/api.c b/api.c
index 647841f..72f8c69 100644
--- a/api.c
+++ b/api.c
@@ -49,6 +49,16 @@
#define VERSION(ver) #ver
/*
+ * The errno which happend the last time (have to be thread specific)
+ */
+__thread int last_errno;
+
+#define MAXLEN 256
+
+/* the value have to be thread specific */
+__thread char errtext[MAXLEN];
+
+/*
* Remember to bump this up for major API changes.
*/
const static char cg_version[] = VERSION(PACKAGE_VERSION);
@@ -94,6 +104,7 @@ char *cgroup_strerror_codes[] = {
"Cgroup parsing failed",
"Cgroup, rules file does not exist",
"Cgroup mounting failed",
+ "The config file can not be opend",
};
static int cg_chown_file(FTS *fts, FTSENT *ent, uid_t owner, gid_t group)
@@ -294,14 +305,15 @@ static int cgroup_parse_rules(bool cache, uid_t muid, gid_t mgid)
dbg("Failed to open configuration file %s with"
" error: %s\n", CGRULES_CONF_FILE,
strerror(errno));
- ret = errno;
+ last_errno = errno;
goto finish;
}
buff = calloc(CGROUP_RULE_MAXLINE, sizeof(char));
if (!buff) {
dbg("Out of memory? Error: %s\n", strerror(errno));
- ret = errno;
+ last_errno = errno;
+ ret = ECGOTHER;
goto close_unlock;
}
@@ -442,7 +454,8 @@ static int cgroup_parse_rules(bool cache, uid_t muid, gid_t mgid)
newrule = calloc(1, sizeof(struct cgroup_rule));
if (!newrule) {
dbg("Out of memory? Error: %s\n", strerror(errno));
- ret = errno;
+ last_errno = errno;
+ ret = ECGOTHER;
goto cleanup;
}
@@ -565,6 +578,7 @@ int cgroup_init()
*/
buf = malloc(FILENAME_MAX);
if (!buf) {
+ last_errno = errno;
ret = ECGOTHER;
goto unlock_exit;
}
@@ -777,11 +791,13 @@ int cgroup_attach_task_pid(struct cgroup *cgroup, pid_t tid)
dbg("Error writing tid %d to %s:%s\n",
tid, path, strerror(errno));
fclose(tasks);
+ last_errno = errno;
return ECGOTHER;
}
ret = fflush(tasks);
if (ret) {
+ last_errno = errno;
dbg("Error writing tid %d to %s:%s\n",
tid, path, strerror(errno));
fclose(tasks);
@@ -822,6 +838,7 @@ int cgroup_attach_task_pid(struct cgroup *cgroup, pid_t tid)
}
ret = fprintf(tasks, "%d", tid);
if (ret < 0) {
+ last_errno = errno;
dbg("Error writing tid %d to %s:%s\n",
tid, path, strerror(errno));
fclose(tasks);
@@ -829,6 +846,7 @@ int cgroup_attach_task_pid(struct cgroup *cgroup, pid_t tid)
}
ret = fflush(tasks);
if (ret) {
+ last_errno = errno;
dbg("Error writing tid %d to %s:%s\n",
tid, path, strerror(errno));
fclose(tasks);
@@ -872,12 +890,16 @@ static int cg_mkdir_p(const char *path)
buf = getcwd(cwd, FILENAME_MAX);
- if (!buf)
+ if (!buf) {
+ last_errno = errno;
return ECGOTHER;
+ }
real_path = strdup(path);
- if (!real_path)
+ if (!real_path) {
+ last_errno = errno;
return ECGOTHER;
+ }
do {
while (real_path[j] != '\0' && real_path[j] != '/')
@@ -892,6 +914,7 @@ static int cg_mkdir_p(const char *path)
ret = mkdir(str, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
wd = strdup(str);
if (!wd) {
+ last_errno = errno;
ret = ECGOTHER;
break;
}
@@ -1030,6 +1053,7 @@ int cgroup_modify_cgroup(struct cgroup *cgroup)
ret = asprintf(&path, "%s%s", base,
cgroup->controller[i]->values[j]->name);
if (ret < 0) {
+ last_errno = errno;
error = ECGOTHER;
goto err;
}
@@ -1175,6 +1199,7 @@ int cgroup_create_cgroup(struct cgroup *cgroup, int ignore_ownership)
base = strdup(path);
if (!base) {
+ last_errno = errno;
error = ECGOTHER;
goto err;
}
@@ -1191,6 +1216,7 @@ int cgroup_create_cgroup(struct cgroup *cgroup, int ignore_ownership)
ret = asprintf(&path, "%s%s", base,
cgroup->controller[k]->values[j]->name);
if (ret < 0) {
+ last_errno = errno;
error = ECGOTHER;
goto err;
}
@@ -1215,12 +1241,14 @@ int cgroup_create_cgroup(struct cgroup *cgroup, int ignore_ownership)
free(path);
ret = asprintf(&path, "%s/tasks", base);
if (ret < 0) {
+ last_errno = errno;
error = ECGOTHER;
goto err;
}
error = chown(path, cgroup->tasks_uid,
cgroup->tasks_gid);
if (error) {
+ last_errno = errno;
error = ECGOTHER;
goto err;
}
@@ -1403,6 +1431,7 @@ int cgroup_delete_cgroup(struct cgroup *cgroup, int ignore_migration)
cgroup->controller[i]->name))
continue;
error = rmdir(path);
+ last_errno = errno;
}
open_err:
if (ignore_migration) {
@@ -1411,8 +1440,10 @@ open_err:
cgroup->controller[i]->name))
continue;
error = rmdir(path);
- if (error < 0 && errno == ENOENT)
+ if (error < 0 && errno == ENOENT) {
+ last_errno = errno;
error = 0;
+ }
}
}
if (error)
@@ -1441,8 +1472,10 @@ static int cg_rd_ctrl_file(char *subsys, char *cgroup, char *file, char **value)
return ECGROUPVALUENOTEXIST;
*value = malloc(CG_VALUE_MAX);
- if (!*value)
+ if (!*value) {
+ last_errno = errno;
return ECGOTHER;
+ }
/*
* using %as crashes when we try to read from files like
@@ -1596,11 +1629,13 @@ int cgroup_get_cgroup(struct cgroup *cgroup)
ret = asprintf(&control_path, "%s/tasks", path);
if (ret < 0) {
+ last_errno = errno;
error = ECGOTHER;
goto unlock_error;
}
if (stat(control_path, &stat_buffer)) {
+ last_errno = errno;
free(control_path);
error = ECGOTHER;
goto unlock_error;
@@ -1620,6 +1655,7 @@ int cgroup_get_cgroup(struct cgroup *cgroup)
dir = opendir(path);
if (!dir) {
+ last_errno = errno;
error = ECGOTHER;
goto unlock_error;
}
@@ -1739,8 +1775,10 @@ static int cg_prepare_controller_array(char *cstr, char *controllers[])
if (temp) {
controllers[j] = strdup(temp);
- if (!controllers[j])
+ if (!controllers[j]) {
+ last_errno = errno;
return ECGOTHER;
+ }
}
j++;
} while (temp);
@@ -2137,6 +2175,7 @@ int cgroup_get_current_controller_path(pid_t pid, const char *controller,
*/
if (ret != 3 || ret == EOF) {
dbg("read failed for pid_cgroup_fd ret %d\n", ret);
+ last_errno = errno;
ret = ECGOTHER;
goto done;
}
@@ -2147,6 +2186,7 @@ int cgroup_get_current_controller_path(pid_t pid, const char *controller,
== 0) {
*current_path = strdup(cgroup_path);
if (!*current_path) {
+ last_errno = errno;
ret = ECGOTHER;
goto done;
}
@@ -2168,5 +2208,19 @@ cleanup_path:
char *cgroup_strerror(int code)
{
assert((code >= ECGROUPNOTCOMPILED) && (code < ECGSENTINEL));
+ if (code == ECGOTHER) {
+ snprintf(errtext, MAXLEN, "%s: error message: %s",
+ cgroup_strerror_codes[code % ECGROUPNOTCOMPILED],
+ strerror(cgroup_get_last_errno()));
+ return errtext;
+ }
return cgroup_strerror_codes[code % ECGROUPNOTCOMPILED];
}
+
+/**
+ * Return last errno, which caused ECGOTHER error.
+ */
+int cgroup_get_last_errno()
+{
+ return last_errno;
+}
generated by cgit (git 2.34.1) at 2024-05-12 06:06:09 +0000