lphillips@lpami.wimsey.bc.ca (Larry Phillips) (12/10/89)
In <14752@boulder.Colorado.EDU>, hunt@boulder.Colorado.EDU (HUNT LEE CAMERON) writes: >I ran into what I perceived as a bug in ARP 1.3 a few months ago and >forgot about it until now (when your hard disk gets trashed you forget >about a lot of things). Anywho, has anybody been able to make a file or >directory called 'a' under ARP 1.3 and consequently tried to delete it? >Using ARP's delete the file won't go away, but ol' AmigaDOS's delete will >get rid of it. Has anybody else seen this? The letter 'a' is a keyword for 'ask'. Try... del "a" -larry -- " All I ask of my body is that it carry around my head." - Thomas Alva Edison - +-----------------------------------------------------------------------+ | // Larry Phillips | | \X/ lphillips@lpami.wimsey.bc.ca -or- uunet!van-bc!lpami!lphillips | | COMPUSERVE: 76703,4322 -or- 76703.4322@compuserve.com | +-----------------------------------------------------------------------+
hunt@boulder.Colorado.EDU (HUNT LEE CAMERON) (12/10/89)
I ran into what I perceived as a bug in ARP 1.3 a few months ago and forgot about it until now (when your hard disk gets trashed you forget about a lot of things). Anywho, has anybody been able to make a file or directory called 'a' under ARP 1.3 and consequently tried to delete it? Using ARP's delete the file won't go away, but ol' AmigaDOS's delete will get rid of it. Has anybody else seen this? --Lee uucp: ...!ncar!boulder!spot!hunt
lindwall@beowulf.ucsd.edu (John Lindwall) (12/10/89)
In article <14752@boulder.Colorado.EDU> hunt@spot.Colorado.EDU (HUNT LEE CAMERON) writes: >Anywho, has anybody been able to make a file or >directory called 'a' under ARP 1.3 and consequently tried to delete it? >Using ARP's delete the file won't go away, but ol' AmigaDOS's delete will >get rid of it. Has anybody else seen this? > The delete command is interpreting your a as the abreviation for the ASK keyword, instead of as a filename. The ASK keyword is neat - you could say delete #? a and delete will prompt you for each file or directory "Delete foo?" Like rm -i on Un*x. To get help with ARP commands, type CommandName ? and a short template is printed. A second ? gets you a second (more Un*x-like usage message). To get rid of the file called a, use delete "a". John Lindwall John Lindwall lindwall@cs.ucsd.edu
barrett@jhunix.HCF.JHU.EDU (Dan Barrett) (12/11/89)
In article <14752@boulder.Colorado.EDU> hunt@spot.Colorado.EDU (HUNT LEE CAMERON) writes: >has anybody been able to make a file or >directory called 'a' under ARP 1.3 and consequently tried to delete it? Try: 1> delete "a" I guess that the ARP delete program thinks "a" is the beginning of a keyword like "all" or "ask". This is a problem inherent in all command-line parsing in which special keywords are not preceded by some sort of switch character. For example, try creating a file called "dates" and then listing it: 1> list dates "dates" is a special keyword for the "list" program. Yuck!!! Dan //////////////////////////////////////\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ | Dan Barrett, Department of Computer Science Baltimore, MD 21218 | | INTERNET: barrett@cs.jhu.edu | UUCP: barrett@jhunix.UUCP | | COMPUSERVE: >internet:barrett@cs.jhu.edu | BITNET: barrett@jhuvms.bitnet | \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\/////////////////////////////////////
bill@NCoast.ORG (Bill Hogsett) (12/11/89)
I just deleted a directory and file named a using the arp 1.3 delete command. The only way to do it is to use the full path as the argument to delete rather than just "delete a". If I just did "delete a" the program responded "Nothing to delete". Looks like a minor bug to me. -- ************************************************************************ Bill Hogsett CLEVELAND AREA-AMIGA USERS' GROUP ncoast!bill (216) 292-4404 (BBS) ncoast!wfhami!bill 20876 Almar Dr. Shaker Heights, OH 44122 I get paid for my legal opinions, but
wfh58@leah.Albany.Edu (William F. Hammond) (12/11/89)
In article <1989Dec10.195003.10146@NCoast.ORG>, bill@NCoast.ORG (Bill Hogsett) writes: > > I just deleted a directory and file named a using the arp > 1.3 delete command. The only way to do it is to use the full path > as the argument to delete rather than just "delete a". If I just did > "delete a" the program responded "Nothing to delete". > *** "A=ASK" is a keyword for interactive-query deleting. Thus, the command delete a * will query you about deletion of every file in the current directory. If you simply want to delete a file in the current directory named "a", then enclose the filename in quotes: delete "a" ------------------------------------------------------------------------ William F. Hammond Dept. of Mathematics & Statistics 518-442-4625 SUNYA, Albany, NY 12222 wfh58@leah.albany.edu wfh58@albnyvms.bitnet -------------------------------------------------------------------------
castong@bucsb.UUCP (Paul Castonguay) (12/13/89)
What does the following line mean?
Wait(1 << Window->UserPort->mp_SigBit)
I know it causes my program to wait for a response in the IDCMP port,
but how exactly does this work?
-> means structure member notation for pointers
<< means shift left, a bitwise operator, which can also be enterpreted
as multiplication by 2
So, why should shifting the mp_SigBit member of the window's UserPort
one bit position to the left magically cause my application to wake up
from a sleeping condition and recognize the presence of an incoming message?
-Paul Castonguayguineau@wjg.enet.dec.com (12/14/89)
> What does the following line mean? > > Wait(1 << Window->UserPort->mp_SigBit) > > I know it causes my program to wait for a response in the IDCMP port, > but how exactly does this work? > > -> means structure member notation for pointers > > << means shift left, a bitwise operator, which can also be enterpreted > as multiplication by 2 > > So, why should shifting the mp_SigBit member of the window's UserPort > One bit position to the left magically cause my application to wake up > from a sleeping condition and recognize the presence of an incoming message? It doesn't. The << (and >>) C operators mean a << b Shift a left by b bit positions. (shift right for >> ) So Wait(1 << Window->UserPort->mp_SigBit) means shift a 1 left to the position corresponding to the signal number. So for example an mp_SigBit of 3 coresponds to a bit mask of binary 1000 (i.e. bit position 3). Wait needs a bit mask, while mp_SigBit is the signal number. > -Paul Castonguay John Guineau
bevis@EE.ECN.PURDUE.EDU (Jeff Bevis) (12/15/89)
In article <148@bucsb.UUCP>, castong@bucsb.bu.edu (paul castonguay) writes: >What does the following line mean? > > Wait(1 << Window->UserPort->mp_SigBit) > Actually, the '1<<N' means "shift 1 to the left by N bits," which can be interpreted as a multiplication by 2^N. Having said that, the result of this expression probably will be much clearer. The mp_SigBit is the bit *number* of the signal bit assigned to this message port, which you will Wait() on for messages. You can wait on one or many signals simultaneously by passing a bit *mask* (or, in exec-ese, a mask of *flags*) to Wait(). However, sing mp_SigBit is not a *mask* (ie, a single 1 in a longword of 0's), you need to convert it to such, and then pass it to Wait(). That is what the line in question does. Then, exec causes your task to be suspended until that signal bit becomes active (ie, a message is sent to your window's message port), and then you awaken. Hope this helps. +--------------------------------+--------------------------------------------+ | Jeff Bevis | "But I don't like spam!" | | bevis@en.ecn.purdue.edu | Give me Amiga or nothing at all. | +--------------------------------+--------------------------------------------+
aduncan@rhea.trl.oz.au (Allan Duncan) (12/18/89)
> "delete a" the program responded "Nothing to delete". > > Looks like a minor bug to me. > The filename a that you give is also a keyword for all. Try delete "a" and you will find that it works. Allan Duncan ACSnet aduncan@rhea.trl.oz ARPA aduncan%rhea.trl.oz.au@uunet.uu.net UUCP {uunet,hplabs,ukc}!munnari!rhea.trl.oz.au!aduncan Telecom Research Labs, PO Box 249, Clayton, Victoria, 3168, Australia.