atrace: use creat instead of truncate
Change-Id: Ie25c704f33c419c0c542249ae2841393862df0ab
diff --git a/cmds/atrace/atrace.cpp b/cmds/atrace/atrace.cpp
index 29838e4..d85a1d7 100644
--- a/cmds/atrace/atrace.cpp
+++ b/cmds/atrace/atrace.cpp
@@ -176,13 +176,18 @@
// Truncate a file.
static bool truncateFile(const char* path)
{
- int err = truncate(path, 0);
- if (err != 0) {
+ // This uses creat rather than truncate because some of the debug kernel
+ // device nodes (e.g. k_ftraceFilterPath) currently aren't changed by
+ // calls to truncate, but they are cleared by calls to creat.
+ int traceFD = creat(path, 0);
+ if (traceFD == -1) {
fprintf(stderr, "error truncating %s: %s (%d)\n", path,
- strerror(errno), errno);
+ strerror(errno), errno);
return false;
}
+ close(traceFD);
+
return true;
}