Error on PQputline()

The contents of the error message are:

conn->errorMessage.data    0x00312440 "pqFlush() --  couldn't send data:
errno=0
No error A non-blocking socket operation could not be completed
immediately.

for this:
         if (PQputline(conn, pszBCPdata[i++]) == EOF)          printf("Error inserting data on row %d\n",
i-1);

What is the correct recovery action?  Do I send the same buffer again?