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-rw-r--r--trace/control.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/trace/control.c b/trace/control.c
new file mode 100644
index 000000000..4c5527d20
--- /dev/null
+++ b/trace/control.c
@@ -0,0 +1,42 @@
+/*
+ * Interface for configuring and controlling the state of tracing events.
+ *
+ * Copyright (C) 2011 LluĂ­s Vilanova <vilanova@ac.upc.edu>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "trace/control.h"
+
+
+void trace_backend_init_events(const char *fname)
+{
+ if (fname == NULL) {
+ return;
+ }
+
+ FILE *fp = fopen(fname, "r");
+ if (!fp) {
+ fprintf(stderr, "error: could not open trace events file '%s': %s\n",
+ fname, strerror(errno));
+ exit(1);
+ }
+ char line_buf[1024];
+ while (fgets(line_buf, sizeof(line_buf), fp)) {
+ size_t len = strlen(line_buf);
+ if (len > 1) { /* skip empty lines */
+ line_buf[len - 1] = '\0';
+ if (!trace_event_set_state(line_buf, true)) {
+ fprintf(stderr,
+ "error: trace event '%s' does not exist\n", line_buf);
+ exit(1);
+ }
+ }
+ }
+ if (fclose(fp) != 0) {
+ fprintf(stderr, "error: closing file '%s': %s\n",
+ fname, strerror(errno));
+ exit(1);
+ }
+}