/*
* Populates the reception buffer with the next complete message.
* The caller must acquire the client's lock.
*/
static
int receive_message(struct lttng_notification_channel *channel)
{
ssize_t ret;
struct lttng_notification_channel_message msg;
ret = lttng_dynamic_buffer_set_size(&channel->reception_buffer, 0);
if (ret) {
goto error;
}
ret = lttcomm_recv_unix_sock(channel->socket, &msg, sizeof(msg));
if (ret <= 0) {
ret = -1;
goto error;
}
if (msg.size > DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE) {
ret = -1;
goto error;
}
/* Add message header at buffer's start. */
ret = lttng_dynamic_buffer_append(&channel->reception_buffer, &msg,
sizeof(msg));
if (ret) {
goto error;
}
/* Reserve space for the payload. */
ret = lttng_dynamic_buffer_set_size(&channel->reception_buffer,
channel->reception_buffer.size + msg.size);
if (ret) {
goto error;
}
/* Receive message payload. */
ret = lttcomm_recv_unix_sock(channel->socket,
channel->reception_buffer.data + sizeof(msg), msg.size);
if (ret < (ssize_t) msg.size) {
ret = -1;
goto error;
}
ret = 0;
end:
return ret;
error:
if (lttng_dynamic_buffer_set_size(&channel->reception_buffer, 0)) {
ret = -1;
}
goto end;
}
static
int run_as_cmd(struct run_as_worker *worker,
enum run_as_cmd cmd,
struct run_as_data *data,
uid_t uid, gid_t gid)
{
ssize_t readlen, writelen;
struct run_as_ret recvret;
/*
* If we are non-root, we can only deal with our own uid.
*/
if (geteuid() != 0) {
if (uid != geteuid()) {
recvret.ret = -1;
recvret._errno = EPERM;
ERR("Client (%d)/Server (%d) UID mismatch (and sessiond is not root)",
(int) uid, (int) geteuid());
goto end;
}
}
data->cmd = cmd;
data->uid = uid;
data->gid = gid;
writelen = lttcomm_send_unix_sock(worker->sockpair[0], data,
sizeof(*data));
if (writelen < sizeof(*data)) {
PERROR("Error writing message to run_as");
recvret.ret = -1;
recvret._errno = errno;
goto end;
}
/* receive return value */
readlen = lttcomm_recv_unix_sock(worker->sockpair[0], &recvret,
sizeof(recvret));
if (!readlen) {
ERR("Run-as worker has hung-up during run_as_cmd");
recvret.ret = -1;
recvret._errno = EIO;
goto end;
} else if (readlen < sizeof(recvret)) {
PERROR("Error reading response from run_as");
recvret.ret = -1;
recvret._errno = errno;
}
if (do_recv_fd(worker, cmd, &recvret.ret)) {
recvret.ret = -1;
recvret._errno = EIO;
}
end:
errno = recvret._errno;
return recvret.ret;
}
/*
* Receive data from the sessiond socket.
*
* On success, returns the number of bytes received (>=0)
* On error, returns -1 (recvmsg() error) or -ENOTCONN
*/
static int recv_data_sessiond(void *buf, size_t len)
{
int ret;
if (!connected) {
ret = -LTTNG_ERR_NO_SESSIOND;
goto end;
}
ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
if (ret < 0) {
ret = -LTTNG_ERR_FATAL;
}
end:
return ret;
}
/*
* Check session daemon health for a specific health component.
*
* Return 0 if health is OK or else 1 if BAD.
*
* Any other negative value is a lttng error code which can be translated with
* lttng_strerror().
*/
int lttng_health_check(enum lttng_health_component c)
{
int sock, ret;
struct lttcomm_health_msg msg;
struct lttcomm_health_data reply;
/* Connect to the sesssion daemon */
sock = lttcomm_connect_unix_sock(health_sock_path);
if (sock < 0) {
ret = -LTTNG_ERR_NO_SESSIOND;
goto error;
}
msg.cmd = LTTNG_HEALTH_CHECK;
msg.component = c;
ret = lttcomm_send_unix_sock(sock, (void *)&msg, sizeof(msg));
if (ret < 0) {
ret = -LTTNG_ERR_FATAL;
goto close_error;
}
ret = lttcomm_recv_unix_sock(sock, (void *)&reply, sizeof(reply));
if (ret < 0) {
ret = -LTTNG_ERR_FATAL;
goto close_error;
}
ret = reply.ret_code;
close_error:
close(sock);
error:
return ret;
}
/*
* Thread managing health check socket.
*/
void *thread_manage_health(void *data)
{
int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
uint32_t revents, nb_fd;
struct lttng_poll_event events;
struct health_comm_msg msg;
struct health_comm_reply reply;
int is_root;
DBG("[thread] Manage health check started");
setup_health_path();
rcu_register_thread();
/* We might hit an error path before this is created. */
lttng_poll_init(&events);
/* Create unix socket */
sock = lttcomm_create_unix_sock(health_unix_sock_path);
if (sock < 0) {
ERR("Unable to create health check Unix socket");
ret = -1;
goto error;
}
is_root = !getuid();
if (is_root) {
/* lttng health client socket path permissions */
ret = chown(health_unix_sock_path, 0,
utils_get_group_id(tracing_group_name));
if (ret < 0) {
ERR("Unable to set group on %s", health_unix_sock_path);
PERROR("chown");
ret = -1;
goto error;
}
ret = chmod(health_unix_sock_path,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
if (ret < 0) {
ERR("Unable to set permissions on %s", health_unix_sock_path);
PERROR("chmod");
ret = -1;
goto error;
}
}
/*
* Set the CLOEXEC flag. Return code is useless because either way, the
* show must go on.
*/
(void) utils_set_fd_cloexec(sock);
ret = lttcomm_listen_unix_sock(sock);
if (ret < 0) {
goto error;
}
/* Size is set to 1 for the consumer_channel pipe */
ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
if (ret < 0) {
ERR("Poll set creation failed");
goto error;
}
ret = lttng_poll_add(&events, health_quit_pipe[0], LPOLLIN);
if (ret < 0) {
goto error;
}
/* Add the application registration socket */
ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI);
if (ret < 0) {
goto error;
}
/* Perform prior memory accesses before decrementing ready */
cmm_smp_mb__before_uatomic_dec();
uatomic_dec(<tng_consumer_ready);
while (1) {
DBG("Health check ready");
/* Inifinite blocking call, waiting for transmission */
restart:
ret = lttng_poll_wait(&events, -1);
if (ret < 0) {
/*
* Restart interrupted system call.
*/
if (errno == EINTR) {
goto restart;
}
goto error;
}
nb_fd = ret;
for (i = 0; i < nb_fd; i++) {
/* Fetch once the poll data */
revents = LTTNG_POLL_GETEV(&events, i);
pollfd = LTTNG_POLL_GETFD(&events, i);
if (!revents) {
/* No activity for this FD (poll implementation). */
continue;
}
/* Thread quit pipe has been closed. Killing thread. */
ret = check_health_quit_pipe(pollfd, revents);
if (ret) {
err = 0;
goto exit;
}
/* Event on the registration socket */
if (pollfd == sock) {
if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)
&& !(revents & LPOLLIN)) {
ERR("Health socket poll error");
goto error;
}
}
}
new_sock = lttcomm_accept_unix_sock(sock);
if (new_sock < 0) {
goto error;
}
/*
* Set the CLOEXEC flag. Return code is useless because either way, the
* show must go on.
*/
(void) utils_set_fd_cloexec(new_sock);
DBG("Receiving data from client for health...");
ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg));
if (ret <= 0) {
DBG("Nothing recv() from client... continuing");
ret = close(new_sock);
if (ret) {
PERROR("close");
}
new_sock = -1;
continue;
}
rcu_thread_online();
assert(msg.cmd == HEALTH_CMD_CHECK);
memset(&reply, 0, sizeof(reply));
for (i = 0; i < NR_HEALTH_CONSUMERD_TYPES; i++) {
/*
* health_check_state return 0 if thread is in
* error.
*/
if (!health_check_state(health_consumerd, i)) {
reply.ret_code |= 1ULL << i;
}
}
DBG("Health check return value %" PRIx64, reply.ret_code);
ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply));
if (ret < 0) {
ERR("Failed to send health data back to client");
}
/* End of transmission */
ret = close(new_sock);
if (ret) {
PERROR("close");
}
new_sock = -1;
}
exit:
error:
if (err) {
ERR("Health error occurred in %s", __func__);
}
DBG("Health check thread dying");
unlink(health_unix_sock_path);
if (sock >= 0) {
ret = close(sock);
if (ret) {
PERROR("close");
}
}
lttng_poll_clean(&events);
rcu_unregister_thread();
return NULL;
}
static
int run_as_create_worker_no_lock(const char *procname,
post_fork_cleanup_cb clean_up_func,
void *clean_up_user_data)
{
pid_t pid;
int i, ret = 0;
ssize_t readlen;
struct run_as_ret recvret;
struct run_as_worker *worker;
assert(!global_worker);
if (!use_clone()) {
/*
* Don't initialize a worker, all run_as tasks will be performed
* in the current process.
*/
ret = 0;
goto end;
}
worker = zmalloc(sizeof(*worker));
if (!worker) {
ret = -ENOMEM;
goto end;
}
worker->procname = strdup(procname);
if (!worker->procname) {
ret = -ENOMEM;
goto error_procname_alloc;
}
/* Create unix socket. */
if (lttcomm_create_anon_unix_socketpair(worker->sockpair) < 0) {
ret = -1;
goto error_sock;
}
/* Fork worker. */
pid = fork();
if (pid < 0) {
PERROR("fork");
ret = -1;
goto error_fork;
} else if (pid == 0) {
/* Child */
reset_sighandler();
set_worker_sighandlers();
if (clean_up_func) {
if (clean_up_func(clean_up_user_data) < 0) {
ERR("Run-as post-fork clean-up failed, exiting.");
exit(EXIT_FAILURE);
}
}
/* Just close, no shutdown. */
if (close(worker->sockpair[0])) {
PERROR("close");
exit(EXIT_FAILURE);
}
/*
* Close all FDs aside from STDIN, STDOUT, STDERR and sockpair[1]
* Sockpair[1] is used as a control channel with the master
*/
for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
if (i != worker->sockpair[1]) {
(void) close(i);
}
}
worker->sockpair[0] = -1;
ret = run_as_worker(worker);
if (lttcomm_close_unix_sock(worker->sockpair[1])) {
PERROR("close");
ret = -1;
}
worker->sockpair[1] = -1;
free(worker->procname);
free(worker);
LOG(ret ? PRINT_ERR : PRINT_DBG, "run_as worker exiting (ret = %d)", ret);
exit(ret ? EXIT_FAILURE : EXIT_SUCCESS);
} else {
/* Parent */
/* Just close, no shutdown. */
if (close(worker->sockpair[1])) {
PERROR("close");
ret = -1;
goto error_fork;
}
worker->sockpair[1] = -1;
worker->pid = pid;
/* Wait for worker to become ready. */
readlen = lttcomm_recv_unix_sock(worker->sockpair[0],
&recvret, sizeof(recvret));
if (readlen < sizeof(recvret)) {
ERR("readlen: %zd", readlen);
PERROR("Error reading response from run_as at creation");
ret = -1;
goto error_fork;
}
global_worker = worker;
}
end:
return ret;
/* Error handling. */
error_fork:
for (i = 0; i < 2; i++) {
if (worker->sockpair[i] < 0) {
continue;
}
if (lttcomm_close_unix_sock(worker->sockpair[i])) {
PERROR("close");
}
worker->sockpair[i] = -1;
}
error_sock:
free(worker->procname);
error_procname_alloc:
free(worker);
return ret;
}
static
int run_as_cmd(struct run_as_worker *worker,
enum run_as_cmd cmd,
struct run_as_data *data,
struct run_as_ret *ret_value,
uid_t uid, gid_t gid)
{
int ret = 0;
ssize_t readlen, writelen;
/*
* If we are non-root, we can only deal with our own uid.
*/
if (geteuid() != 0) {
if (uid != geteuid()) {
ret = -1;
ret_value->_errno = EPERM;
ERR("Client (%d)/Server (%d) UID mismatch (and sessiond is not root)",
(int) uid, (int) geteuid());
goto end;
}
}
data->cmd = cmd;
data->uid = uid;
data->gid = gid;
/*
* Stage 1: Send the run_as_data struct to the worker process
*/
writelen = lttcomm_send_unix_sock(worker->sockpair[0], data,
sizeof(*data));
if (writelen < sizeof(*data)) {
PERROR("Error writing message to run_as");
ret = -1;
ret_value->_errno = EIO;
goto end;
}
/*
* Stage 2: Send file descriptor to the worker process if needed
*/
ret = send_fd_to_worker(worker, data->cmd, data->fd);
if (ret) {
PERROR("do_send_fd error");
ret = -1;
ret_value->_errno = EIO;
goto end;
}
/*
* Stage 3: Wait for the execution of the command
*/
/*
* Stage 4: Receive the run_as_ret struct containing the return value and
* errno
*/
readlen = lttcomm_recv_unix_sock(worker->sockpair[0], ret_value,
sizeof(*ret_value));
if (!readlen) {
ERR("Run-as worker has hung-up during run_as_cmd");
ret = -1;
ret_value->_errno = EIO;
goto end;
} else if (readlen < sizeof(*ret_value)) {
PERROR("Error reading response from run_as");
ret = -1;
ret_value->_errno = errno;
goto end;
}
if (ret_value->_error) {
/* Skip stage 5 on error as there will be no fd to receive. */
goto end;
}
/*
* Stage 5: Receive file descriptor if needed
*/
ret = recv_fd_from_worker(worker, data->cmd, &ret_value->fd);
if (ret < 0) {
ERR("Error receiving fd");
ret = -1;
ret_value->_errno = EIO;
}
end:
return ret;
}
/*
* Return < 0 on error, 0 if OK, 1 on hangup.
*/
static
int handle_one_cmd(struct run_as_worker *worker)
{
int ret = 0;
struct run_as_data data;
ssize_t readlen, writelen;
struct run_as_ret sendret;
run_as_fct cmd;
uid_t prev_euid;
memset(&sendret, 0, sizeof(sendret));
sendret.fd = -1;
/*
* Stage 1: Receive run_as_data struct from the master.
* The structure contains the command type and all the parameters needed for
* its execution
*/
readlen = lttcomm_recv_unix_sock(worker->sockpair[1], &data,
sizeof(data));
if (readlen == 0) {
/* hang up */
ret = 1;
goto end;
}
if (readlen < sizeof(data)) {
PERROR("lttcomm_recv_unix_sock error");
ret = -1;
goto end;
}
cmd = run_as_enum_to_fct(data.cmd);
if (!cmd) {
ret = -1;
goto end;
}
/*
* Stage 2: Receive file descriptor from master.
* Some commands need a file descriptor as input so if it's needed we
* receive the fd using the Unix socket.
*/
ret = recv_fd_from_master(worker, data.cmd, &data.fd);
if (ret < 0) {
PERROR("recv_fd_from_master error");
ret = -1;
goto end;
}
prev_euid = getuid();
if (data.gid != getegid()) {
ret = setegid(data.gid);
if (ret < 0) {
sendret._error = true;
sendret._errno = errno;
PERROR("setegid");
goto write_return;
}
}
if (data.uid != prev_euid) {
ret = seteuid(data.uid);
if (ret < 0) {
sendret._error = true;
sendret._errno = errno;
PERROR("seteuid");
goto write_return;
}
}
/*
* Also set umask to 0 for mkdir executable bit.
*/
umask(0);
/*
* Stage 3: Execute the command
*/
ret = (*cmd)(&data, &sendret);
if (ret < 0) {
DBG("Execution of command returned an error");
}
write_return:
ret = cleanup_received_fd(data.cmd, data.fd);
if (ret < 0) {
ERR("Error cleaning up FD");
goto end;
}
/*
* Stage 4: Send run_as_ret structure to the master.
* This structure contain the return value of the command and the errno.
*/
writelen = lttcomm_send_unix_sock(worker->sockpair[1], &sendret,
sizeof(sendret));
if (writelen < sizeof(sendret)) {
PERROR("lttcomm_send_unix_sock error");
ret = -1;
goto end;
}
/*
* Stage 5: Send file descriptor to the master
* Some commands return a file descriptor so if it's needed we pass it back
* to the master using the Unix socket.
*/
ret = send_fd_to_master(worker, data.cmd, sendret.fd);
if (ret < 0) {
DBG("Sending FD to master returned an error");
goto end;
}
if (seteuid(prev_euid) < 0) {
PERROR("seteuid");
ret = -1;
goto end;
}
ret = 0;
end:
return ret;
}
LTTNG_HIDDEN
int run_as_create_worker(char *procname)
{
pid_t pid;
int i, ret = 0;
ssize_t readlen;
struct run_as_ret recvret;
struct run_as_worker *worker;
pthread_mutex_lock(&worker_lock);
assert(!global_worker);
if (!use_clone()) {
/*
* Don't initialize a worker, all run_as tasks will be performed
* in the current process.
*/
ret = 0;
goto end;
}
worker = zmalloc(sizeof(*worker));
if (!worker) {
ret = -ENOMEM;
goto end;
}
worker->procname = procname;
/* Create unix socket. */
if (lttcomm_create_anon_unix_socketpair(worker->sockpair) < 0) {
ret = -1;
goto error_sock;
}
/* Fork worker. */
pid = fork();
if (pid < 0) {
PERROR("fork");
ret = -1;
goto error_fork;
} else if (pid == 0) {
/* Child */
reset_sighandler();
set_worker_sighandlers();
/* The child has no use for this lock. */
pthread_mutex_unlock(&worker_lock);
/* Just close, no shutdown. */
if (close(worker->sockpair[0])) {
PERROR("close");
exit(EXIT_FAILURE);
}
worker->sockpair[0] = -1;
ret = run_as_worker(worker);
if (lttcomm_close_unix_sock(worker->sockpair[1])) {
PERROR("close");
ret = -1;
}
worker->sockpair[1] = -1;
LOG(ret ? PRINT_ERR : PRINT_DBG, "run_as worker exiting (ret = %d)", ret);
exit(ret ? EXIT_FAILURE : EXIT_SUCCESS);
} else {
/* Parent */
/* Just close, no shutdown. */
if (close(worker->sockpair[1])) {
PERROR("close");
ret = -1;
goto error_fork;
}
worker->sockpair[1] = -1;
worker->pid = pid;
/* Wait for worker to become ready. */
readlen = lttcomm_recv_unix_sock(worker->sockpair[0],
&recvret, sizeof(recvret));
if (readlen < sizeof(recvret)) {
ERR("readlen: %zd", readlen);
PERROR("Error reading response from run_as at creation");
ret = -1;
goto error_fork;
}
global_worker = worker;
}
end:
pthread_mutex_unlock(&worker_lock);
return ret;
/* Error handling. */
error_fork:
for (i = 0; i < 2; i++) {
if (worker->sockpair[i] < 0) {
continue;
}
if (lttcomm_close_unix_sock(worker->sockpair[i])) {
PERROR("close");
}
worker->sockpair[i] = -1;
}
error_sock:
free(worker);
pthread_mutex_unlock(&worker_lock);
return ret;
}
/*
* Return < 0 on error, 0 if OK, 1 on hangup.
*/
static
int handle_one_cmd(struct run_as_worker *worker)
{
int ret = 0;
struct run_as_data data;
ssize_t readlen, writelen;
struct run_as_ret sendret;
run_as_fct cmd;
uid_t prev_euid;
/* Read data */
readlen = lttcomm_recv_unix_sock(worker->sockpair[1], &data,
sizeof(data));
if (readlen == 0) {
/* hang up */
ret = 1;
goto end;
}
if (readlen < sizeof(data)) {
PERROR("lttcomm_recv_unix_sock error");
ret = -1;
goto end;
}
cmd = run_as_enum_to_fct(data.cmd);
if (!cmd) {
ret = -1;
goto end;
}
prev_euid = getuid();
if (data.gid != getegid()) {
ret = setegid(data.gid);
if (ret < 0) {
PERROR("setegid");
goto write_return;
}
}
if (data.uid != prev_euid) {
ret = seteuid(data.uid);
if (ret < 0) {
PERROR("seteuid");
goto write_return;
}
}
/*
* Also set umask to 0 for mkdir executable bit.
*/
umask(0);
ret = (*cmd)(&data);
write_return:
sendret.ret = ret;
sendret._errno = errno;
/* send back return value */
writelen = lttcomm_send_unix_sock(worker->sockpair[1], &sendret,
sizeof(sendret));
if (writelen < sizeof(sendret)) {
PERROR("lttcomm_send_unix_sock error");
ret = -1;
goto end;
}
ret = do_send_fd(worker, data.cmd, ret);
if (ret) {
PERROR("do_send_fd error");
ret = -1;
goto end;
}
if (seteuid(prev_euid) < 0) {
PERROR("seteuid");
ret = -1;
goto end;
}
ret = 0;
end:
return ret;
}
/*
* Thread managing health check socket.
*/
static void *thread_manage_health(void *data)
{
const bool is_root = (getuid() == 0);
int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
uint32_t revents, nb_fd;
struct lttng_poll_event events;
struct health_comm_msg msg;
struct health_comm_reply reply;
/* Thread-specific quit pipe. */
struct thread_notifiers *notifiers = data;
const int quit_pipe_read_fd = lttng_pipe_get_readfd(
notifiers->quit_pipe);
DBG("[thread] Manage health check started");
rcu_register_thread();
/*
* Created with a size of two for:
* - client socket
* - thread quit pipe
*/
ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
if (ret < 0) {
goto error;
}
/* Create unix socket */
sock = lttcomm_create_unix_sock(config.health_unix_sock_path.value);
if (sock < 0) {
ERR("Unable to create health check Unix socket");
goto error;
}
if (is_root) {
/* lttng health client socket path permissions */
gid_t gid;
ret = utils_get_group_id(config.tracing_group_name.value, true, &gid);
if (ret) {
/* Default to root group. */
gid = 0;
}
ret = chown(config.health_unix_sock_path.value, 0, gid);
if (ret < 0) {
ERR("Unable to set group on %s", config.health_unix_sock_path.value);
PERROR("chown");
goto error;
}
ret = chmod(config.health_unix_sock_path.value,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
if (ret < 0) {
ERR("Unable to set permissions on %s", config.health_unix_sock_path.value);
PERROR("chmod");
goto error;
}
}
/*
* Set the CLOEXEC flag. Return code is useless because either way, the
* show must go on.
*/
(void) utils_set_fd_cloexec(sock);
ret = lttcomm_listen_unix_sock(sock);
if (ret < 0) {
goto error;
}
ret = lttng_poll_add(&events, quit_pipe_read_fd, LPOLLIN | LPOLLERR);
if (ret < 0) {
goto error;
}
/* Add the application registration socket */
ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI);
if (ret < 0) {
goto error;
}
mark_thread_as_ready(notifiers);
while (1) {
DBG("Health check ready");
/* Infinite blocking call, waiting for transmission */
restart:
ret = lttng_poll_wait(&events, -1);
if (ret < 0) {
/*
* Restart interrupted system call.
*/
if (errno == EINTR) {
goto restart;
}
goto error;
}
nb_fd = ret;
for (i = 0; i < nb_fd; i++) {
/* Fetch once the poll data */
revents = LTTNG_POLL_GETEV(&events, i);
pollfd = LTTNG_POLL_GETFD(&events, i);
/* Event on the registration socket */
if (pollfd == sock) {
if (revents & LPOLLIN) {
continue;
} else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
ERR("Health socket poll error");
goto error;
} else {
ERR("Unexpected poll events %u for sock %d", revents, pollfd);
goto error;
}
} else {
/* Event on the thread's quit pipe. */
err = 0;
goto exit;
}
}
new_sock = lttcomm_accept_unix_sock(sock);
if (new_sock < 0) {
goto error;
}
/*
* Set the CLOEXEC flag. Return code is useless because either way, the
* show must go on.
*/
(void) utils_set_fd_cloexec(new_sock);
DBG("Receiving data from client for health...");
ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg));
if (ret <= 0) {
DBG("Nothing recv() from client... continuing");
ret = close(new_sock);
if (ret) {
PERROR("close");
}
continue;
}
rcu_thread_online();
memset(&reply, 0, sizeof(reply));
for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) {
/*
* health_check_state returns 0 if health is
* bad.
*/
if (!health_check_state(health_sessiond, i)) {
reply.ret_code |= 1ULL << i;
}
}
DBG2("Health check return value %" PRIx64, reply.ret_code);
ret = lttcomm_send_unix_sock(new_sock, (void *) &reply,
sizeof(reply));
if (ret < 0) {
ERR("Failed to send health data back to client");
}
/* End of transmission */
ret = close(new_sock);
if (ret) {
PERROR("close");
}
}
exit:
error:
if (err) {
ERR("Health error occurred in %s", __func__);
}
DBG("Health check thread dying");
unlink(config.health_unix_sock_path.value);
if (sock >= 0) {
ret = close(sock);
if (ret) {
PERROR("close");
}
}
lttng_poll_clean(&events);
rcu_unregister_thread();
return NULL;
}