Read and parse all of /proc/net/dev_mcast#2565
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Reading from Linux procfs with a single read() does not guarantee reading of the full buffer length.
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Reading from Linux procfs with a single
read()does not guarantee reading of the full buffer length. Sometimes,read()returns with some data (less than the buffer length) but the file isn't completely consumed.This patch switches file reading to C++
fstreamand uses its line-reading API to ensure the file can be fully read, without doing any buffer offset dance ourselves.