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Message-ID: <20200623150345.GA26230@kernel.org>
Date: Tue, 23 Jun 2020 12:03:45 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Jiri Olsa <jolsa@...hat.com>
Cc: Alexey Budankov <alexey.budankov@...ux.intel.com>,
Namhyung Kim <namhyung@...nel.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Andi Kleen <ak@...ux.intel.com>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 03/13] perf evlist: implement control command handling
functions
Em Tue, Jun 23, 2020 at 04:56:01PM +0200, Jiri Olsa escreveu:
> On Wed, Jun 17, 2020 at 11:36:46AM +0300, Alexey Budankov wrote:
>
> SNIP
>
> > + memset(cmd_data, 0, data_size--);
> > +
> > + do {
> > + err = read(evlist->ctl_fd.fd, &c, 1);
> > + if (err > 0) {
> > + if (c == '\n' || c == '\0')
> > + break;
> > + cmd_data[bytes_read++] = c;
> > + if (bytes_read == data_size)
> > + break;
> > + } else {
> > + if (err == -1)
> > + pr_err("Failed to read from ctlfd %d: %m\n", evlist->ctl_fd.fd);
> > + break;
> > + }
> > + } while (1);
> > +
> > + pr_debug("Message from ctl_fd: \"%s%s\"\n", cmd_data,
> > + bytes_read == data_size ? "" : c == '\n' ? "\\n" : "\\0");
> > +
> > + if (err > 0) {
> > + if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_TAG,
> > + strlen(EVLIST_CTL_CMD_ENABLE_TAG))) {
>
> you could use sizeof(EVLIST_CTL_CMD_ENABLE_TAG) instead, no function call
-1, as sizeof will get the \0, right?
>
> > + *cmd = EVLIST_CTL_CMD_ENABLE;
> > + } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_DISABLE_TAG,
> > + strlen(EVLIST_CTL_CMD_DISABLE_TAG))) {
>
> ditto
>
> jirka
>
--
- Arnaldo
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