[CRIU] [PATCH 1/2] zdtm: add a new test case, which generate a random process tree
Andrey Vagin
avagin at openvz.org
Tue Apr 16 04:37:39 EDT 2013
From: Andrew Vagin <avagin at openvz.org>
Signed-off-by: Andrey Vagin <avagin at openvz.org>
---
test/zdtm/live/static/Makefile | 1 +
test/zdtm/live/static/session03.c | 377 ++++++++++++++++++++++++++++++++++++++
2 files changed, 378 insertions(+)
create mode 100644 test/zdtm/live/static/session03.c
diff --git a/test/zdtm/live/static/Makefile b/test/zdtm/live/static/Makefile
index 0ddb4fa..0750b6a 100644
--- a/test/zdtm/live/static/Makefile
+++ b/test/zdtm/live/static/Makefile
@@ -85,6 +85,7 @@ TST_NOFILE = \
netns \
session01 \
session02 \
+ session03 \
socket-ext \
unhashed_proc \
cow00 \
diff --git a/test/zdtm/live/static/session03.c b/test/zdtm/live/static/session03.c
new file mode 100644
index 0000000..6cb8e4d
--- /dev/null
+++ b/test/zdtm/live/static/session03.c
@@ -0,0 +1,377 @@
+#define _GNU_SOURCE
+#include <sys/mman.h>
+#include <sched.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <sys/prctl.h>
+#include <sys/user.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc = "Create a crazy process tree";
+const char *test_author = "Andrew Vagin <avagin at parallels.com>";
+
+struct process
+{
+ pid_t pid;
+ pid_t sid;
+ int sks[2];
+ int dead;
+ int wait;
+};
+
+#define MEM_SIZE (2 * PAGE_SIZE)
+#define PR_MAX (MEM_SIZE / sizeof(struct process))
+
+struct process *processes;
+int nr_processes = 0;
+int current = 0;
+
+static void sigchld_handler(int signal, siginfo_t *siginfo, void *data)
+{
+ pid_t pid = siginfo->si_pid;
+ if (siginfo->si_status == 2)
+ waitpid(pid, NULL, WNOHANG);
+}
+
+static void cleanup()
+{
+ int i, ret;
+
+ for (i = 0; i < nr_processes; i++) {
+ if (processes[i].dead)
+ continue;
+ if (processes[i].pid <= 0)
+ continue;
+
+ kill(processes[i].pid, SIGKILL);
+ }
+
+ while (1) {
+ ret = wait(NULL);
+ if (ret == -1) {
+ if (errno == ECHILD)
+ break;
+ err("wait");
+ exit(1);
+ }
+ }
+}
+
+enum commands
+{
+ TEST_FORK,
+ TEST_DIE_WAIT,
+ TEST_DIE,
+ TEST_SUBREAPER,
+ TEST_SETSID,
+ TEST_MAX
+};
+
+int cmd_weght[TEST_MAX] = {10, 3, 1, 10, 7};
+int sum_weight = 0;
+static int get_rnd_op()
+{
+ int i, m;
+ if (sum_weight == 0) {
+ for (i = 0; i < TEST_MAX; i++)
+ sum_weight += cmd_weght[i];
+ }
+ m = lrand48() % sum_weight;
+ for (i = 0; i < TEST_MAX; i++) {
+ if (m > cmd_weght[i]) {
+ m -= cmd_weght[i];
+ continue;
+ }
+ return i;
+ }
+ return -1;
+}
+
+struct command
+{
+ enum commands cmd;
+ int arg1;
+ int arg2;
+};
+
+static void handle_command();
+
+static void mainloop()
+{
+ while (1)
+ handle_command();
+}
+
+#define CLONE_STACK_SIZE PAGE_SIZE
+/* All arguments should be above stack, because it grows down */
+struct clone_args {
+ char stack[CLONE_STACK_SIZE];
+ char stack_ptr[0];
+ int id;
+};
+
+static int clone_func(void *_arg)
+{
+ struct clone_args *args = (struct clone_args *) _arg;
+
+ current = args->id;
+
+ test_msg("%3d: Hello. My pid is %d\n", args->id, getpid());
+ mainloop();
+ exit(0);
+}
+
+static int make_child(int id, int flags)
+{
+ struct clone_args args;
+ pid_t cid;
+
+ args.id = id;
+
+ cid = clone(clone_func, args.stack_ptr,
+ flags | SIGCHLD, &args);
+
+ if (cid < 0)
+ err("clone(%d, %d)", id, flags);
+
+ processes[id].pid = cid;
+
+ return cid;
+}
+
+static void handle_command()
+{
+ int sk = processes[current].sks[0], ret, status = 0;
+ struct command cmd;
+
+ ret = read(sk, &cmd, sizeof(cmd));
+ if (ret != sizeof(cmd)) {
+ err("Unable to get command");
+ goto err;
+ }
+
+ switch (cmd.cmd) {
+ case TEST_FORK:
+ {
+ pid_t pid;
+
+ pid = make_child(cmd.arg1, cmd.arg2 ? CLONE_PARENT : 0);
+ if (pid < 0) {
+ status = -1;
+ goto err;
+ }
+
+ test_msg("%3d: fork(%d, %x) = %d\n",
+ current, cmd.arg1, cmd.arg2, pid);
+ processes[cmd.arg1].pid = pid;
+ }
+ break;
+ case TEST_SUBREAPER:
+ test_msg("%3d: subreaper(%d)\n", current, cmd.arg1);
+ if (prctl(PR_SET_CHILD_SUBREAPER, cmd.arg1, 0, 0, 0) == -1) {
+ err("PR_SET_CHILD_SUBREAPER");
+ status = -1;
+ }
+ break;
+ case TEST_SETSID:
+ if (getsid(getpid()) == getpid())
+ break;
+ test_msg("%3d: setsid()\n", current);
+ if(setsid() == -1) {
+ err("setsid");
+ status = -1;
+ }
+ break;
+ case TEST_DIE_WAIT:
+ test_msg("%3d: wait()\n", current);
+ case TEST_DIE:
+ test_msg("%3d: die()\n", current);
+ processes[current].dead = 1;
+ shutdown(sk, SHUT_RDWR);
+ if (cmd.cmd == TEST_DIE_WAIT)
+ exit(2);
+ exit(0);
+ default:
+ err("Unknown operation %d", cmd.cmd);
+ status = -1;
+ break;
+ }
+
+ ret = write(sk, &status, sizeof(status));
+ if (ret != sizeof(status)) {
+ err("Unable to answer");
+ goto err;
+ }
+
+ if (status < 0)
+ goto err;
+
+ return;
+err:
+ shutdown(sk, SHUT_RDWR);
+ exit(1);
+}
+
+static int send_command(int id, enum commands op, int arg)
+{
+ int sk = processes[id].sks[1], ret, status;
+ struct command cmd = {op, arg};
+
+ if (op == TEST_FORK) {
+ cmd.arg1 = nr_processes;
+ nr_processes++;
+ if (nr_processes > PR_MAX)
+ return -1;
+ cmd.arg2 = arg;
+ }
+
+ ret = write(sk, &cmd, sizeof(cmd));
+ if (ret != sizeof(cmd)) {
+ err("Unable to send command");
+ goto err;
+ }
+
+ status = 0;
+ ret = read(sk, &status, sizeof(status));
+ if (ret != sizeof(status) &&
+ !(status == 0 && (op == TEST_DIE || op == TEST_DIE_WAIT))) {
+ err("Unable to get answer");
+ goto err;
+ }
+
+ if (status) {
+ err("The command(%d, %d, %d) failed");
+ goto err;
+ }
+
+ return 0;
+err:
+ cleanup();
+ exit(1);
+}
+
+int main(int argc, char ** argv)
+{
+ struct sigaction act;
+ int pid, i, ret;
+ int fail_cnt = 0;
+
+ test_init(argc, argv);
+
+ if (prctl(PR_SET_CHILD_SUBREAPER, 1, 0, 0, 0) == -1) {
+ err("PR_SET_CHILD_SUBREAPER");
+ return -1;
+ }
+
+ ret = sigaction(SIGCHLD, NULL, &act);
+ if (ret < 0) {
+ err("sigaction() failed\n");
+ return -1;
+ }
+
+ act.sa_flags |= SA_NOCLDSTOP | SA_SIGINFO | SA_RESTART;
+ act.sa_sigaction = sigchld_handler;
+ sigemptyset(&act.sa_mask);
+ sigaddset(&act.sa_mask, SIGCHLD);
+
+ ret = sigaction(SIGCHLD, &act, NULL);
+ if (ret < 0) {
+ err("sigaction() failed\n");
+ return -1;
+ }
+
+ processes = mmap(NULL, MEM_SIZE, PROT_WRITE | PROT_READ,
+ MAP_SHARED | MAP_ANONYMOUS, 0, 0);
+ if (processes == NULL) {
+ err("Unable to map share memory");
+ return 1;
+ }
+
+ for (i = 0; i < PR_MAX; i++) {
+ if (socketpair(PF_UNIX, SOCK_STREAM, 0, processes[i].sks) == -1) {
+ err("socketpair");
+ return 1;
+ }
+ }
+
+ nr_processes++;
+ pid = make_child(0, 0);
+ if (pid < 0)
+ return -1;
+
+ while(nr_processes < PR_MAX) {
+ int op, id;
+ int flags = lrand48() % 2;
+
+ op = get_rnd_op();
+ if (op == TEST_DIE || op == TEST_DIE_WAIT || op == TEST_SUBREAPER) {
+ if (nr_processes == 1)
+ continue;
+ else
+ id = lrand48() % (nr_processes - 1) + 1;
+ } else if (op == TEST_FORK) {
+ id = nr_processes * 9 / 10 + lrand48() % nr_processes / 10;
+ while (processes[id].dead != 0)
+ id--;
+ } else
+ id = lrand48() % nr_processes;
+
+ if (processes[id].dead)
+ continue;
+
+ send_command(id, op, flags);
+ }
+
+ for (i = 0; i < nr_processes; i++) {
+ if (processes[i].dead)
+ continue;
+ if (processes[i].pid == 0)
+ continue;
+
+ processes[i].sid = getsid(processes[i].pid);
+ if (processes[i].sid == -1) {
+ err("getsid(%d)", i);
+ goto err;
+ }
+ }
+
+ test_daemon();
+
+ test_waitsig();
+
+ for (i = 0; i < nr_processes; i++) {
+ pid_t sid;
+
+ if (processes[i].dead)
+ continue;
+ if (processes[i].pid == 0)
+ continue;
+
+ sid = getsid(processes[i].pid);
+ if (sid == -1) {
+ err("getsid(%d)", i);
+ goto err;
+ }
+
+ if (sid != processes[i].sid) {
+ fail("%d, %d: wrong sid %d (expected %d)",
+ i, processes[i].pid, sid, processes[i].sid);
+ fail_cnt++;
+ }
+ }
+
+ if (fail_cnt)
+ goto err;
+
+ pass();
+
+ cleanup();
+ return 0;
+err:
+ cleanup();
+ return 1;
+}
--
1.8.2
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