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#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include "zdtmtst.h"
const char *test_doc = "Check that empty cgroups are preserved";
const char *test_author = "Tycho Andersen <tycho.andersen@canonical.com>";
char *dirname;
TEST_OPTION(dirname, string, "cgroup directory name", 1);
static const char *cgname = "zdtmtst";
static const char *subname = "subcg01";
static const char *empty = "empty";
int main(int argc, char **argv)
{
int cgfd, l, ret = 1, i;
char aux[1024], paux[1024];
FILE *cgf;
struct stat st;
test_init(argc, argv);
if (mkdir(dirname, 0700) < 0) {
pr_perror("Can't make dir");
goto out;
}
sprintf(aux, "none,name=%s", cgname);
if (mount("none", dirname, "cgroup", 0, aux)) {
pr_perror("Can't mount cgroups");
goto out_rd;
}
sprintf(paux, "%s/%s", dirname, subname);
mkdir(paux, 0600);
l = sprintf(aux, "%d", getpid());
sprintf(paux, "%s/%s/tasks", dirname, subname);
cgfd = open(paux, O_WRONLY);
if (cgfd < 0) {
pr_perror("Can't open tasks");
goto out_rs;
}
l = write(cgfd, aux, l);
close(cgfd);
if (l < 0) {
pr_perror("Can't move self to subcg");
goto out_rs;
}
for (i = 0; i < 2; i++) {
sprintf(paux, "%s/%s/%s.%d", dirname, subname, empty, i);
if (mkdir(paux, 0600)) {
pr_perror("mkdir %s", paux);
goto out_rs;
}
}
test_daemon();
test_waitsig();
cgf = fopen("/proc/self/mountinfo", "r");
if (cgf == NULL) {
fail("No mountinfo file");
goto out_rs;
}
while (fgets(paux, sizeof(paux), cgf)) {
char *s;
s = strstr(paux, cgname);
if (!s)
continue;
sscanf(paux, "%*d %*d %*d:%*d %*s %s", aux);
test_msg("found cgroup at %s\n", aux);
for (i = 0; i < 2; i++) {
ssprintf(paux, "%s/%s/%s.%d", aux, subname, empty, i);
if (stat(paux, &st)) {
fail("couldn't stat %s", paux);
ret = -1;
goto out_close;
}
if (!S_ISDIR(st.st_mode)) {
fail("%s is not a directory", paux);
ret = -1;
goto out_close;
}
}
pass();
ret = 0;
goto out_close;
}
fail("empty cgroup not found!");
out_close:
fclose(cgf);
out_rs:
umount(dirname);
out_rd:
rmdir(dirname);
out:
return ret;
}
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