Red Hat Enterprise Linux, all versions
This is normal and expected, in the worst case this may indicate an issue with your application.
When recvfrom is used on a non-blocking socket, it returns
EAGAIN error if there are no pending data to be read.
As mentioned in
man 3 recvfrom:
ERRORS The recvfrom() function shall fail if: EAGAIN or EWOULDBLOCK The socket's file descriptor is marked O_NONBLOCK and no data is waiting to be received; or MSG_OOB is set and no out-of-band data is available and either the socket's file descriptor is marked O_NONBLOCK or the socket does not support blocking to await out-of-band data.
In case an application has opened non-blocking socket and there are no data on that socket to be read, the
recvfrom() call will return
EAGAIN error, as described.
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