RFR: 8268361: Fix the infinite loop in next_line [v5]

[UncleNine]

On Fri, 11 Jun 2021 06:10:22 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> Would it not be better to read the whole content of /proc/stat with a single read() call instead of line by line? I don't think proc fs guarantees any kind of consistency with separate reads.

yes, so fgetc's return value should need to be checked

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PR: https://git.openjdk.java.net/jdk/pull/4378