struct trace_key trace_setup_key = TRACE_KEY_INIT(SETUP);
/* Get a trace file descriptor from "key" env variable. */
-static int get_trace_fd(struct trace_key *key)
+static int get_trace_fd(struct trace_key *key, const char *override_envvar)
{
const char *trace;
if (key->initialized)
return key->fd;
- trace = getenv(key->key);
+ trace = override_envvar ? override_envvar : getenv(key->key);
if (!trace || !strcmp(trace, "") ||
!strcmp(trace, "0") || !strcasecmp(trace, "false"))
return key->fd;
}
+void trace_override_envvar(struct trace_key *key, const char *value)
+{
+ trace_disable(key);
+ key->initialized = 0;
+
+ /*
+ * Invoke get_trace_fd() to initialize key using the given value
+ * instead of the value of the environment variable.
+ */
+ get_trace_fd(key, value);
+}
+
void trace_disable(struct trace_key *key)
{
if (key->need_close)
static void trace_write(struct trace_key *key, const void *buf, unsigned len)
{
- if (write_in_full(get_trace_fd(key), buf, len) < 0) {
+ if (write_in_full(get_trace_fd(key, NULL), buf, len) < 0) {
warning("unable to write trace for %s: %s",
key->key, strerror(errno));
trace_disable(key);
int trace_want(struct trace_key *key)
{
- return !!get_trace_fd(key);
+ return !!get_trace_fd(key, NULL);
}
#if defined(HAVE_CLOCK_GETTIME) && defined(HAVE_CLOCK_MONOTONIC)