#define _LGPL_SOURCE
#include <sys/types.h>
#include <sys/socket.h>
-#include <sys/prctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <usterr-signal-safe.h>
#include "tracepoint-internal.h"
#include "ltt-tracer-core.h"
+#include "compat.h"
/*
* Has lttng ust comm constructor been called ?
int register_app_to_sessiond(int socket)
{
ssize_t ret;
- int prctl_ret;
struct {
uint32_t major;
uint32_t minor;
reg_msg.uid = getuid();
reg_msg.gid = getgid();
reg_msg.bits_per_long = CAA_BITS_PER_LONG;
- prctl_ret = prctl(PR_GET_NAME, (unsigned long) reg_msg.name, 0, 0, 0);
- if (prctl_ret) {
- ERR("Error executing prctl");
- return -errno;
- }
+ lttng_ust_getprocname(reg_msg.name);
ret = ustcomm_send_unix_sock(socket, ®_msg, sizeof(reg_msg));
if (ret >= 0 && ret != sizeof(reg_msg))
}
static
-void cleanup_sock_info(struct sock_info *sock_info)
+void cleanup_sock_info(struct sock_info *sock_info, int exiting)
{
int ret;
sock_info->root_handle = -1;
}
sock_info->constructor_sem_posted = 0;
- if (sock_info->wait_shm_mmap) {
+ /*
+ * When called from process exit, we allow this memory map to be
+ * released by the OS at exit(), because removing it prior to
+ * this can cause a segmentation fault when using the
+ * futex_async timer-based fallback. And we cannot join those
+ * threads because sys_futex does not react to the cancellation
+ * request.
+ *
+ * So we actually _do_ release it only after a fork, since all
+ * threads have vanished anyway.
+ */
+ if (!exiting && sock_info->wait_shm_mmap) {
ret = munmap(sock_info->wait_shm_mmap, sysconf(_SC_PAGE_SIZE));
if (ret) {
ERR("Error unmapping wait shm");
static
void lttng_ust_cleanup(int exiting)
{
- cleanup_sock_info(&global_apps);
+ cleanup_sock_info(&global_apps, exiting);
if (local_apps.allowed) {
- cleanup_sock_info(&local_apps);
+ cleanup_sock_info(&local_apps, exiting);
}
lttng_ust_abi_exit();
lttng_ust_events_exit();
ERR("Error cancelling local ust listener thread");
}
}
+ /*
+ * We cannot join the threads because they might be waiting on
+ * sys_futex. Simply let the OS exit() clean up those threads.
+ */
lttng_ust_cleanup(1);
}