make issues - duping jobs pipe about didbs

[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