linux-kernel - [PATCH] tools: hv: handle EINTR in hv_fcopy

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Message-Id: <20170825110246.28397-1-olaf@aepfle.de>
Date:   Fri, 25 Aug 2017 13:02:46 +0200
From:   Olaf Hering <olaf@...fle.de>
To:     "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        devel@...uxdriverproject.org (open list:Hyper-V CORE AND DRIVERS),
        linux-kernel@...r.kernel.org (open list)
Cc:     Olaf Hering <olaf@...fle.de>
Subject: [PATCH] tools: hv: handle EINTR in hv_fcopy_daemon

If strace attaches to the daemon pread returns with EINTR, and the
process exits. Catch this case and continue with the next iteration.

Signed-off-by: Olaf Hering <olaf@...fle.de>
---
 tools/hv/hv_fcopy_daemon.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/hv/hv_fcopy_daemon.c b/tools/hv/hv_fcopy_daemon.c
index c273dd34d144..574e6bf5865c 100644
--- a/tools/hv/hv_fcopy_daemon.c
+++ b/tools/hv/hv_fcopy_daemon.c
@@ -201,6 +201,8 @@ int main(int argc, char *argv[])
 		ssize_t len;
 		len = pread(fcopy_fd, &buffer, sizeof(buffer), 0);
 		if (len < 0) {
+			if (errno == EINTR)
+				continue;
 			syslog(LOG_ERR, "pread failed: %s", strerror(errno));
 			exit(EXIT_FAILURE);
 		}