On 04/14/2015 05:27 PM, 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>
> ---
> lib/perf-counter.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> 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) {
Did you mean to reverse this condition? It seems like it should be how
it was (fd__ > 0).
> + if (read(fd__, counter, sizeof(*counter)) < 0) {
> + *counter = 0;
> + }
> } else {
> *counter = 0;
> }
>
This isn't required by any means, but I'd be tempted to rework it so you
only have to set counter to 0 once, so something like:
{
int res = -1;
if (fd__ > 0) {
res = read(fd__, counter, sizeof(*counter));
}
if (res < 0) {
*counter = 0;
}
...
--
Russell Bryant
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