-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Apr 13, 2007, at 10:57 AM, Jean-Paul Calderone wrote: >> I don't know if this is caused by a bug in the Mac's pty >> implementation or something we're doing wrong on that platform. I >> played around with several modifications to pty.fork() on the Mac, >> including letting it drop down to the openpty()/os.fork() code, even >> adding an explicit ioctl(slave_fd, TIOCSCTTY) call which Stevens >> chapter 19 recommends for 4.3+BSD. I can't get it to not block. > > What about reading from the child in the parent before calling > waitpid? Yep, this is what I suggested below. Porting the same change over to Linux produced an OSError, but that's probably just because I wasn't as careful as I should have been late last night. >> Barring a fix to pty.fork() (or possibly os.forkpty()) for the Mac, >> then I would like to at least make test_pty.py not block when run in >> verbose mode. A very simple hack would add something like this to >> the "if pid == pty.CHILD" stanza: "def debug(msg): pass", possibly >> protected by a "if verbose:". A less icky hack would be to read the >> output from the master_fd in the parent, though you have to be >> careful with that on Linux else the read can throw an input/output >> error. >> >> Disabling debug output is band-aid yes, and any application on the >> Mac like the above snippet will still fail. If anybody has any >> suggestions, I'm all ears, but I've reached the limit of my pty-fu. >> > > I don't think this is an OS X PTY bug. Writing to a blocking file > descriptor can block. Programs that do this need to account for the > possibility. Why doesn't it block on Linux then? - -Barry -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (Darwin) iQCVAwUBRh+banEjvBPtnXfVAQJxFQP+LRAdGVHuqquvGNT9fncGeJFuCjGm+dsS VnE8cirvfoSEdJ0nZ11wHMoMH2vtbXyfjLJJ4G/sROMmHKWJ2t5ieNIxmVutiiLa OPyls2bzuXL8IoyYh+c8tKRyBd76O5GN2EZABxGm2Tie5nt72ezVSEfiDovc6qEu 4lYERTD1YKA= =fZaZ -----END PGP SIGNATURE-----
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