From: Tomas Hozza <thozza@redhat.com>
Date: Thu, 27 Jun 2013 11:52:49 +0000 (+0200)
Subject: tools: hv: Check return value of poll call
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=9561d479314f16b41563f73511fb61d91de4642f;p=deliverable%2Flinux.git

tools: hv: Check return value of poll call

Check return value of poll call and if it fails print error to the
system log. If errno is EINVAL then exit with non-zero value otherwise
continue the while loop and call poll again.

Signed-off-by: Tomas Hozza <thozza@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/tools/hv/hv_vss_daemon.c b/tools/hv/hv_vss_daemon.c
index 64112e193552..5febe3542f79 100644
--- a/tools/hv/hv_vss_daemon.c
+++ b/tools/hv/hv_vss_daemon.c
@@ -200,7 +200,16 @@ int main(void)
 		socklen_t addr_l = sizeof(addr);
 		pfd.events = POLLIN;
 		pfd.revents = 0;
-		poll(&pfd, 1, -1);
+
+		if (poll(&pfd, 1, -1) < 0) {
+			syslog(LOG_ERR, "poll failed; error:%d %s", errno, strerror(errno));
+			if (errno == EINVAL) {
+				close(fd);
+				exit(EXIT_FAILURE);
+			}
+			else
+				continue;
+		}
 
 		len = recvfrom(fd, vss_recv_buffer, sizeof(vss_recv_buffer), 0,
 				addr_p, &addr_l);