The documentation gives an example for opening trace marker with write-only mode, but the flag WR_ONLY is not defined by glibc. Use O_WRONLY to replace it. Signed-off-by: Leo Yan <leo.yan@xxxxxxxxxx> --- Documentation/trace/ftrace.rst | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst index b37dc19e4d40..60bceb018d6a 100644 --- a/Documentation/trace/ftrace.rst +++ b/Documentation/trace/ftrace.rst @@ -564,7 +564,7 @@ of ftrace. Here is a list of some of the key files: start:: - trace_fd = open("trace_marker", WR_ONLY); + trace_fd = open("trace_marker", O_WRONLY); Note: Writing into the trace_marker file can also initiate triggers that are written into /sys/kernel/tracing/events/ftrace/print/trigger -- 2.34.1