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tools/hv: terminate fcopy daemon if read from uio fails

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Terminate endless loop in reading fails, to avoid flooding syslog.

This happens if the state of "Guest services" integration service
is changed from "enabled" to "disabled" at runtime in the VM
settings. In this case pread returns EIO.

Also handle an interrupted system call, and continue in this case.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Reviewed-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Link: https://lore.kernel.org/r/20241105081437.15689-1-olaf@aepfle.de
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20241105081437.15689-1-olaf@aepfle.de>
This commit is contained in:
Olaf Hering 2024-11-05 09:14:04 +01:00 committed by Wei Liu
parent 67b5e1042d
commit a9640fcdd4
1 changed files with 3 additions and 1 deletions
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4
tools/hv/hv_fcopy_uio_daemon.c
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@ -466,8 +466,10 @@ int main(int argc, char *argv[])
*/ */
ret = pread(fcopy_fd, &tmp, sizeof(int), 0); ret = pread(fcopy_fd, &tmp, sizeof(int), 0);
if (ret < 0) { if (ret < 0) {
if (errno == EINTR || errno == EAGAIN)
continue;
syslog(LOG_ERR, "pread failed: %s", strerror(errno)); syslog(LOG_ERR, "pread failed: %s", strerror(errno));
continue; goto close;
} }
len = HV_RING_SIZE; len = HV_RING_SIZE;