Implement --shm-path option for UST sessions (per-uid channels)

[lttng-tools.git] / src / bin / lttng-sessiond / ust-metadata.c

diff --git a/src/bin/lttng-sessiond/ust-metadata.c b/src/bin/lttng-sessiond/ust-metadata.c
index 379429285ad6af7f033ce3950c29190eacf706ac..f4f273b16cc7021e2f4869e52b42dfd7f14799dd 100644 (file)
--- a/src/bin/lttng-sessiond/ust-metadata.c
+++ b/src/bin/lttng-sessiond/ust-metadata.c
@@ -120,6 +120,23 @@ ssize_t metadata_reserve(struct ust_registry_session *session, size_t len)
        return ret;
 }
 
+static
+int metadata_file_append(struct ust_registry_session *session,
+               const char *str, size_t len)
+{
+       ssize_t written;
+
+       if (session->metadata_fd < 0) {
+               return 0;
+       }
+       /* Write to metadata file */
+       written = lttng_write(session->metadata_fd, str, len);
+       if (written != len) {
+               return -1;
+       }
+       return 0;
+}
+
 /*
  * We have exclusive access to our metadata buffer (protected by the
  * ust_lock), so we can do racy operations such as looking for
@@ -149,6 +166,11 @@ int lttng_metadata_printf(struct ust_registry_session *session,
                goto end;
        }
        memcpy(&session->metadata[offset], str, len);
+       ret = metadata_file_append(session, str, len);
+       if (ret) {
+               PERROR("Error appending to metadata file");
+               goto end;
+       }
        DBG3("Append to metadata: \"%s\"", str);
        ret = 0;
 
@@ -575,6 +597,15 @@ int ust_metadata_session_statedump(struct ust_registry_session *session,
                uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
                uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
 
+       /* For crash ABI */
+       ret = lttng_metadata_printf(session,
+               "/* CTF %u.%u */\n\n",
+               CTF_SPEC_MAJOR,
+               CTF_SPEC_MINOR);
+       if (ret) {
+               goto end;
+       }
+
        ret = lttng_metadata_printf(session,
                "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
                "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"