make issues - duping jobs pipe

[danielhams]

Occasionally make is failing due to "duping jobs pipe".

It possibly open file limit or some other issue. Needs deeper investigation, might be related to IRIX select not working quite exactly like regular select.

[danielhams]

Added some additional tracing in what will be 0.0.7 info to try and help discover what error is actually being returned when this happens.

[danielhams]

Issue reproduced with jobserver_pre_acquire - looks like make_job_rfd returns -1 from make_job_rfd() call.

This is EINTRLOOP(job_rfd, dup(job_fds[0])) - at a guess irix occasionally return EMFILE for too many files or something like that.

To dig deeper later.

[danielhams]

And so I have my first occurence of this with the logging in place.

In posixos.c, jobserver_pre_acquire:

DH job_fds[0]=3 job_rfd=-1 and errno=2
DH job_rf_val=-1

Which is actually failing deeper down in the make_job_rfd code - which in turn is a call to EINTRLOOP that isn't giving back what it should.

[danielhams]

Another one:

DH job_fds[0]=3 job_rfd=-1 and errno=9
DH job_rf_val=-1
make: *** duping jobs pipe #2: Bad file number

[danielhams]

Massive hit this too:

DH job_fds[0]=6 job_rfd=-1 and errno=9
DH job_rf_val=-1
make[2]:  duping jobs pipe #2: Bad file number.  Stop.
make[2]:  Waiting for unfinished jobs....
  GEN      sys/time.h