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Diffstat (limited to 'trace.c')
-rw-r--r--trace.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/trace.c b/trace.c
index b3ef0e627f..f726686fd9 100644
--- a/trace.c
+++ b/trace.c
@@ -29,7 +29,7 @@ struct trace_key trace_perf_key = TRACE_KEY_INIT(PERFORMANCE);
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;
@@ -37,7 +37,7 @@ static int get_trace_fd(struct trace_key *key)
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"))
@@ -68,6 +68,18 @@ static int get_trace_fd(struct trace_key *key)
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)
@@ -112,7 +124,7 @@ static int prepare_trace_line(const char *file, int line,
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);
@@ -383,7 +395,7 @@ void trace_repo_setup(const char *prefix)
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)