xen console: update the "to be written" count #538
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looks fine to me, a regression test could be added here in the solo5 test suite (the behaviour should be reproducible without any mirageos / ocaml involved). |
avsm
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Thanks, the test is done by @hannesm, I will cut a release. |
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Previously we can get an infinite loop as
writtenis the number of bytes written to the console returned byconsole_write_some(from 0 to itslenargument) (l111), then it's compared against len for teminating the loop (l126).The issue is that if
lenis greater than the Xen buffer size (2048B), we have to loop over the buffer and useconsole_write_somemore than one time (and it will return something in the interval[0,len-written[which will never equalslen(l126).The proposed patch
lower theincrease the written count until it reacheslenwhich will stand for "how many bytes I still have to write", and stops the loop when it comes to 0len. This fix #537.