Fix: add missing lttng-clock.c

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/liblttng-ust/lttng-clock.c b/liblttng-ust/lttng-clock.c
new file mode 100644 (file)
index 0000000..557fc6b
--- /dev/null
+++ b/liblttng-ust/lttng-clock.c
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2014  Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; version 2.1 of
+ * the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#define _GNU_SOURCE
+#include <error.h>
+#include <dlfcn.h>
+#include <stdlib.h>
+#include <usterr-signal-safe.h>
+#include <lttng/ust-clock.h>
+#include <urcu/system.h>
+#include <urcu/arch.h>
+
+#include "clock.h"
+
+struct lttng_trace_clock *lttng_trace_clock;
+
+static
+struct lttng_trace_clock user_tc;
+
+int lttng_ust_trace_clock_set_read64_cb(uint64_t (*read64)(void))
+{
+       if (CMM_LOAD_SHARED(lttng_trace_clock))
+               return -EBUSY;
+       user_tc.read64 = read64;
+       return 0;
+}
+
+int lttng_ust_trace_clock_set_freq_cb(uint64_t (*freq)(void))
+{
+       if (CMM_LOAD_SHARED(lttng_trace_clock))
+               return -EBUSY;
+       user_tc.freq = freq;
+       return 0;
+}
+
+int lttng_ust_trace_clock_set_uuid_cb(int (*uuid)(char *uuid))
+{
+       if (CMM_LOAD_SHARED(lttng_trace_clock))
+               return -EBUSY;
+       user_tc.uuid = uuid;
+       return 0;
+}
+
+int lttng_ust_trace_clock_set_name_cb(const char *(*name)(void))
+{
+       if (CMM_LOAD_SHARED(lttng_trace_clock))
+               return -EBUSY;
+       user_tc.name = name;
+       return 0;
+}
+
+int lttng_ust_trace_clock_set_description_cb(const char *(*description)(void))
+{
+       if (CMM_LOAD_SHARED(lttng_trace_clock))
+               return -EBUSY;
+       user_tc.description = description;
+       return 0;
+}
+
+int lttng_ust_enable_trace_clock_override(void)
+{
+       if (CMM_LOAD_SHARED(lttng_trace_clock))
+               return -EBUSY;
+       if (!user_tc.read64)
+               return -EINVAL;
+       if (!user_tc.freq)
+               return -EINVAL;
+       if (!user_tc.name)
+               return -EINVAL;
+       if (!user_tc.description)
+               return -EINVAL;
+       /* Use default uuid cb when NULL */
+       cmm_smp_mb();   /* Store callbacks before trace clock */
+       CMM_STORE_SHARED(lttng_trace_clock, &user_tc);
+       return 0;
+}
+
+void lttng_ust_clock_init(void)
+{
+       const char *libname;
+       void *handle;
+       void (*libinit)(void);
+
+
+       libname = secure_getenv("LTTNG_UST_CLOCK_PLUGIN");
+       if (!libname)
+               return;
+       handle = dlopen(libname, RTLD_NOW);
+       if (!handle) {
+               PERROR("Cannot load LTTng UST clock override library %s",
+                       libname);
+               return;
+       }
+       dlerror();
+       libinit = (void (*)(void)) dlsym(handle,
+               "lttng_ust_clock_plugin_init");
+       if (!libinit) {
+               PERROR("Cannot find LTTng UST clock override library %s initialization function lttng_ust_clock_plugin_init()",
+                       libname);
+               return;
+       }
+       libinit();
+}