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Message-ID: <20200623145601.GH2619137@krava>
Date: Tue, 23 Jun 2020 16:56:01 +0200
From: Jiri Olsa <jolsa@...hat.com>
To: Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
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
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
> + *cmd = EVLIST_CTL_CMD_ENABLE;
> + } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_DISABLE_TAG,
> + strlen(EVLIST_CTL_CMD_DISABLE_TAG))) {
ditto
jirka
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