[bug #66499] Parameter for option -j seems not to be validated and can cause hangs

[Paul D. Smith]

Follow-up Comment #1, bug #66499 (group make):

The problem is that we are trying to write that many tokens into the jobserver
pipe, and it's hanging because there is nothing reading from the pipe.

The number of jobs that can be managed depends on how large a pipe the system
supports.  Unfortunately I know of no way to determine how large a pipe a
system supports short of filling one up.

I expect to fix this we'll need to write nonblocking until we get back an
error.


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