libust ABI: export streams

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

diff --git a/libust/lttng-ust-comm.c b/libust/lttng-ust-comm.c
index 1507a65fcd588a3276d863d87f36a1ff1c22d295..d88c4afb2346c000dedd5a96c9fa5239f37bb265 100644 (file)
--- a/libust/lttng-ust-comm.c
+++ b/libust/lttng-ust-comm.c
@@ -184,10 +184,6 @@ int register_app_to_sessiond(int socket)
        ret = lttcomm_send_unix_sock(socket, &reg_msg, sizeof(reg_msg));
        if (ret >= 0 && ret != sizeof(reg_msg))
                return -EIO;
-       ret = fdatasync(socket);
-       if (ret) {
-               return -errno;
-       }
        return ret;
 }
 
@@ -195,17 +191,11 @@ static
 int send_reply(int sock, struct lttcomm_ust_reply *lur)
 {
        ssize_t len;
-       int ret;
 
        len = lttcomm_send_unix_sock(sock, lur, sizeof(*lur));
        switch (len) {
        case sizeof(*lur):
                DBG("message successfully sent");
-               ret = fdatasync(sock);
-               if (ret) {
-                       DBG("fdatasync error");
-                       return -1;
-               }
                return 0;
        case -1:
                if (errno == ECONNRESET) {
@@ -292,8 +282,33 @@ end:
        } else {
                lur.ret_code = LTTCOMM_SESSION_FAIL;
        }
+       if (lum->cmd == LTTNG_UST_STREAM) {
+               /*
+                * Special-case reply to send stream info.
+                * Use lum.u output.
+                */
+               lur.u.stream.memory_map_size = lum->u.stream.memory_map_size;
+       }
        ret = send_reply(sock, &lur);
 
+       if (lum->cmd == LTTNG_UST_STREAM && ret >= 0) {
+               /* we also need to send the file descriptors. */
+               ret = lttcomm_send_fds_unix_sock(sock,
+                       &lum->u.stream.shm_fd, &lum->u.stream.shm_fd,
+                       1, sizeof(int));
+               if (ret < 0) {
+                       perror("send shm_fd");
+                       goto error;
+               }
+               ret = lttcomm_send_fds_unix_sock(sock,
+                       &lum->u.stream.wait_fd, &lum->u.stream.wait_fd,
+                       1, sizeof(int));
+               if (ret < 0) {
+                       perror("send wait_fd");
+                       goto error;
+               }
+       }
+error:
        ust_unlock();
        return ret;
 }