On Tue, Apr 14, 2015 at 02:27:26PM -0700, Andy Zhou wrote:
> Gcc complains about:
> lib/perf-counter.c:43:13: error: ignoring return value of 'read',
> declared with attribute warn_unused_result [-Werror=unused-result]
> read(fd__, counter, sizeof(*counter));
>
> Signed-off-by: Andy Zhou <az...@nicira.com>
Thanks for the fixing the problem. I have some comments below.
> diff --git a/lib/perf-counter.c b/lib/perf-counter.c
> index 7bd7834..10cc97f 100644
> --- a/lib/perf-counter.c
> +++ b/lib/perf-counter.c
> @@ -39,8 +39,10 @@ static int fd__ = 0;
> uint64_t
> perf_counter_read(uint64_t *counter)
> {
> - if (fd__ > 0) {
> - read(fd__, counter, sizeof(*counter));
> + if (fd__ <= 0) {
The new test on fd__ looks wrong. Shouldn't it be >0 or >=0?
> + if (read(fd__, counter, sizeof(*counter)) < 0) {
Usually we don't use () on the operand of sizeof.
I'd be inclined to test for "< sizeof *counter" instead of < 0 here.
> + *counter = 0;
> + }
> } else {
> *counter = 0;
> }
I guess that you could actually combine the two "if"s into one?
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