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#include <config.h>
#include <glib.h>
#include <glib/gi18n.h>
#include "procman.h"
#include "util.h"
gboolean
cgroups_enabled(void)
{
static gboolean initialized = FALSE;
static gboolean has_cgroups;
if (!initialized) {
initialized = TRUE;
has_cgroups = g_file_test("/proc/cgroups", G_FILE_TEST_EXISTS);
}
return has_cgroups;
}
void
append_cgroup_name(char *line, gchar **current_cgroup_name)
{
gchar *controller, *path, *tmp, *path_plus_space;
int paren_offset, off, tmp_size;
controller = g_strstr_len(line, -1, ":") + 1;
if (!controller)
return;
path = g_strstr_len(controller, -1, ":") + 1;
if (!path)
return;
*(path - 1) = '\0';
g_strdelimit(controller, ",", '/');
if ((std::strcmp(path, "/") == 0) || (std::strncmp(controller, "name=", 5) == 0))
return;
if (*current_cgroup_name == NULL) {
*current_cgroup_name = g_strdup_printf("%s (%s)", path, controller);
return;
}
/* add a space to the end of the path string */
path_plus_space = g_strdup_printf("%s ", path);
if ((tmp = g_strstr_len(*current_cgroup_name, -1, path_plus_space))) {
tmp_size = strlen(*current_cgroup_name) + strlen(controller) + 1;
paren_offset = g_strstr_len(tmp + strlen(path), -1, ")") - *current_cgroup_name;
*(*current_cgroup_name + paren_offset) = '\0';
tmp = (gchar *)g_strnfill(tmp_size, '\0');
off = g_strlcat(tmp, *current_cgroup_name, tmp_size);
*(tmp + off) = '/';
off++;
off += g_strlcat(tmp + off, controller, tmp_size);
*(tmp + off) = ')';
off++;
g_strlcat(tmp + off, *current_cgroup_name + paren_offset + 1, tmp_size);
} else
tmp = g_strdup_printf("%s, %s(%s)", *current_cgroup_name, path_plus_space, controller);
g_free(path_plus_space);
g_free(*current_cgroup_name);
*current_cgroup_name = tmp;
}
int
check_cgroup_changed(gchar *line, gchar *current_cgroup_set)
{
/* check if line is contained in current_cgroup_set */
gchar *controller, *path, *tmp, *found, *close_paren, *open_paren;
int ret = 0;
controller = g_strstr_len(line, -1, ":") + 1;
if (!controller)
return 1;
path = g_strstr_len(controller, -1, ":") + 1;
if (!path)
return 1;
*(path - 1) = '\0';
if (std::strncmp(controller, "name=", 5) == 0)
goto out;
/* if there are multiple controllers just report string has changed */
if (g_strstr_len(controller, -1, ",")) {
ret = 1;
goto out;
}
if (!current_cgroup_set) {
if (std::strcmp(path, "/") != 0)
ret = 1;
goto out;
}
/* special case for root cgroup */
tmp = current_cgroup_set;
if (std::strcmp(path, "/") == 0) {
while ((found = g_strstr_len(tmp, -1, controller))) {
close_paren = g_strstr_len(found, -1, ")");
open_paren = g_strstr_len(found, -1, "(");
if (close_paren) {
if (!open_paren || (close_paren < open_paren)) {
ret = 1;
goto out;
}
}
tmp = found + strlen(controller);
}
goto out;
}
tmp = current_cgroup_set;
while ((found = g_strstr_len(tmp, -1, path))) {
found = found + strlen(path);
close_paren = g_strstr_len(found, -1, ")");
if (*found == ' ') {
if (g_strstr_len(found + 1, close_paren - found, controller))
goto out;
}
tmp = close_paren + 1;
}
ret = 1;
out:
*(path - 1) = ':';
return ret;
}
void
get_process_cgroup_info(ProcInfo *info)
{
gchar *path;
gchar *cgroup_name = NULL;
int cgroups_changed = 0;
gchar *text;
char **lines;
int i;
if (!cgroups_enabled())
return;
/* read out of /proc/pid/cgroup */
path = g_strdup_printf("/proc/%d/cgroup", info->pid);
if (!path)
return;
if(!g_file_get_contents(path, &text, NULL, NULL))
goto out;
lines = g_strsplit(text, "\n", -1);
g_free(text);
if (!lines)
goto out;
for (i = 0; lines[i] != NULL; i++) {
if (lines[i][0] == '\0')
continue;
if (check_cgroup_changed(lines[i], info->cgroup_name)) {
cgroups_changed = 1;
break;
}
}
if (cgroups_changed) {
for (i = 0; lines[i] != NULL; i++) {
if (lines[i][0] == '\0')
continue;
append_cgroup_name(lines[i], &cgroup_name);
}
if (info->cgroup_name)
g_free(info->cgroup_name);
if (!cgroup_name)
info->cgroup_name = g_strdup("");
else
info->cgroup_name = cgroup_name;
}
g_strfreev(lines);
out:
g_free(path);
}
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