Introduce file descriptor tracker

[lttng-ust.git] / liblttng-ust-comm / lttng-ust-comm.c

diff --git a/liblttng-ust-comm/lttng-ust-comm.c b/liblttng-ust-comm/lttng-ust-comm.c
index c01eb9dec37cc3d76b3dc32308c87519f401753c..9fe6d288d633a2ec67c8d78a82cf90d2e52dc2c2 100644 (file)
--- a/liblttng-ust-comm/lttng-ust-comm.c
+++ b/liblttng-ust-comm/lttng-ust-comm.c
@@ -33,6 +33,7 @@
 
 #include <lttng/ust-ctl.h>
 #include <ust-comm.h>
+#include <ust-fd.h>
 #include <helper.h>
 #include <lttng/ust-error.h>
 #include <lttng/ust-events.h>
@@ -94,6 +95,8 @@ const char *lttng_ust_strerror(int code)
  * ustcomm_connect_unix_sock
  *
  * Connect to unix socket using the path name.
+ *
+ * Caller handles FD tracker.
  */
 int ustcomm_connect_unix_sock(const char *pathname, long timeout)
 {
@@ -257,16 +260,22 @@ int ustcomm_listen_unix_sock(int sock)
  * ustcomm_close_unix_sock
  *
  * Shutdown cleanly a unix socket.
+ *
+ * Handles fd tracker internally.
  */
 int ustcomm_close_unix_sock(int sock)
 {
        int ret;
 
+       lttng_ust_lock_fd_tracker();
        ret = close(sock);
-       if (ret < 0) {
+       if (!ret) {
+               lttng_ust_delete_fd_from_tracker(sock);
+       } else {
                PERROR("close");
                ret = -errno;
        }
+       lttng_ust_unlock_fd_tracker();
 
        return ret;
 }
@@ -606,8 +615,10 @@ ssize_t ustcomm_recv_channel_from_sessiond(int sock,
                goto error_recv;
        }
        /* recv wakeup fd */
+       lttng_ust_lock_fd_tracker();
        nr_fd = ustcomm_recv_fds_unix_sock(sock, &wakeup_fd, 1);
        if (nr_fd <= 0) {
+               lttng_ust_unlock_fd_tracker();
                if (nr_fd < 0) {
                        len = nr_fd;
                        goto error_recv;
@@ -617,6 +628,8 @@ ssize_t ustcomm_recv_channel_from_sessiond(int sock,
                }
        }
        *_wakeup_fd = wakeup_fd;
+       lttng_ust_add_fd_to_tracker(wakeup_fd);
+       lttng_ust_unlock_fd_tracker();
        *_chan_data = chan_data;
        return len;
 
@@ -636,8 +649,10 @@ int ustcomm_recv_stream_from_sessiond(int sock,
        int fds[2];
 
        /* recv shm fd and wakeup fd */
+       lttng_ust_lock_fd_tracker();
        len = ustcomm_recv_fds_unix_sock(sock, fds, 2);
        if (len <= 0) {
+               lttng_ust_unlock_fd_tracker();
                if (len < 0) {
                        ret = len;
                        goto error;
@@ -648,6 +663,9 @@ int ustcomm_recv_stream_from_sessiond(int sock,
        }
        *shm_fd = fds[0];
        *wakeup_fd = fds[1];
+       lttng_ust_add_fd_to_tracker(fds[0]);
+       lttng_ust_add_fd_to_tracker(fds[1]);
+       lttng_ust_unlock_fd_tracker();
        return 0;
 
 error: