Jeffrey Ebert <[EMAIL PROTECTED]> writes: [Reports a problem with diald and ppp-2.2.0c not working, and failing with "PPP not available" messages, yet pppd works fine from the command line.] >Eric Schenk wrote: >> (2) There were reports of a problem when starting pppd from inittab. >> This was a result of pppd relying on having a controlling terminal, >> which it does not when started from inittab. This problem may >> be related to what you are seeing. The way the test code is >> written the ppp_available routine would fail if it was run and it >> could not actually open /dev/cua0. >> >> Check the following: >> the permissions on /dev/cua0. >> that you are running diald as root. >> You might also try running diald with /dev/ttyS0 instead (this is >> a shot in the dark, but it's worth a try). > If any of this works I'll be happy to explain why :-) > >Thanks for the help, Eric. I am now executing diald with /dev/ttyS0 and >it works very nicely. Now, how about the explanation?
Ok. Here is what I think is happening (I haven't tested this yet, but it makes sense to me). Ppd needs to open up a terminal line at various times, just to be able to do various ioctl's. Most critically this occurs in ppp_available. Now, the way pppd gets a terminal is it opens the controling terminal /dev/tty. When pppd is invoked from the command line this doesn't cause a problem. But, when pppd is invoked by diald, the controling terminal IS /dev/cua0. Since /dev/cua0 can't be opened by multiple processes at once, and it is already open, the reopen fails. Panic ensues. In any case, I'll look further into this and see if I can't set things up so diald doesn't cause this problem to occur. In the worst case, if I can't avoid this problem, I'll at least document it in the FAQ (and change the manual page examples so they don't use /dev/cua*). Thanks for reporting this, -- eric --------------------------------------------------------------------------- Eric Schenk www: http://www.cs.toronto.edu/~schenk Department of Computer Science email: [EMAIL PROTECTED] University of Toronto
