On 12/3/19 8:46 AM, Jerry Geis wrote:
I am experiencing an issue that my process does not wake out of a select()
call when a single character is received in an input file descriptor when
running as a VMware guest.
Anyone ever experienced this ?
I can run tshark and see the character arrive, but my process does not wake
up and see that character. Most times it works - but once in a while it
does not.
So I made a change on my code - and did not just wait on select() - but
just try to read the buffer all the time and print the results. once in a
while that character is "delayed" getting to my input buffer. Top reports
the machine is 99% idle.
Any thoughts?
Jerry
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You don't say what the app is written in but I ran into this with perl.
perl apps can either be line buffered or character buffered ($| if I
remember right is the switch). Line buffered means the buffer is not
delivered until a newline character is received. If nothing else, try
"<char>\n" and see if that gets consistently delivered.
Cheers,
Dave
--
"They that can give up essential liberty to obtain a little temporary safety deserve neither safety nor liberty."
-- Benjamin Franklin
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