I've uploaded a pre-pre-pre-preliminary hack-around of something I'm hoping will eventually become hurd-init. I'd appreciate it if a couple of people could cast beady eyes over it just to make sure I've not done anything reaaally stupid.
Currently it: - Attempts to open a FIFO for writing and write to it. It sets a dummy SIGALRM handler and set a 2-second alarm. If, for whatever reason, the write failed, it assumes it's the primary init (i.e., the one started by the boot sequence). - If the write succeeds, it does nothing *grin* (It does check that the file it's writing to is in fact a FIFO before attempting to write to it - if it's not, it's treated as a failed write - this is to make sure that 'touch /dev/scm' or something equally silly won't break things). - If it failed, it tries to unlink whatever's there already, then creates a new FIFO and opens it for reading. If this fails, a big warning message is printed on the console (can't create FIFO, something's very wrong, etc), and /bin/sh is exec'd. If the exec of /bin/sh fails, the user's notified that things are *very* wrong, and they'll have to rescue things some other way, and init exits (under HURD, we could use the exit code of init and try and run some sort of emergency console or something - under Linux, this would be kludgy, without a linuxrc or something). - If the creation succeeds, a banner message is printed to the console, and the FIFO is closed and unlinked (this alleviates the 2-second pause if the system was shut down cleanly. Clever pre-init scripts could use this to produce some sort of "thou shalt shut down thine system properly in future" for lusers, which I'm sure Mandrake and Corel would love. :) All in all, a productive couple of hours work. The URL is: http://www.ekto.org/~mckinlay/hurd-init.tar.gz Before anybody picks up on it from the sources, I've deliberately missed out the if(getuid()) check for two reasons: - I'm writing all this in non-superuser-land at the moment - One might want to be able to chown root.admin ; chmod /dev/scm 660 in the future, allowing anybody in a particular group to telinit the system. I'd like to get this as right as possible from the start; so if anybody has any improvements for the existing code, they're greatly appreciated. The contents of scm.c will eventually become part of libscm, which will provide a nice high-level interface to the FIFO operations. Oh, and I'll get around to writing a header file for it. RSN. :) Mo. -- Mo McKinlay Chief Software Architect inter/open Labs ------------------------------------------------------------------------- GnuPG Key: pub 1024D/76A275F9 2000-07-22 Mo McKinlay <[EMAIL PROTECTED]>
