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perf tools: Handle read errors from ctl_fd 

Handle read errors from ctl_fd such as EINTR, EAGAIN and EWOULDBLOCK.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/20200901093758.32293-3-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2020-09-01 12:37:54 +03:00 committed by Arnaldo Carvalho de Melo
parent 9864a66def
commit 40db8ff59e
1 changed files with 11 additions and 5 deletions
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16
tools/perf/util/evlist.c
View File

@ -1802,6 +1802,7 @@ static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
char c;
size_t bytes_read = 0;
*cmd = EVLIST_CTL_CMD_UNSUPPORTED;
memset(cmd_data, 0, data_size);
data_size--;
@ -1813,17 +1814,22 @@ static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
cmd_data[bytes_read++] = c;
if (bytes_read == data_size)
break;
} else {
if (err == -1)
continue;
} else if (err == -1) {
if (errno == EINTR)
continue;
if (errno == EAGAIN || errno == EWOULDBLOCK)
err = 0;
else
pr_err("Failed to read from ctlfd %d: %m\n", evlist->ctl_fd.fd);
break;
}
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 (bytes_read > 0) {
if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_TAG,
(sizeof(EVLIST_CTL_CMD_ENABLE_TAG)-1))) {
*cmd = EVLIST_CTL_CMD_ENABLE;
@ -1833,7 +1839,7 @@ static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
}
}
return err;
return bytes_read ? (int)bytes_read : err;
}
static int evlist__ctlfd_ack(struct evlist *evlist)