qix@ihlpa.ATT.COM (Puckett) (06/27/87)
There was a bug in P: version 1.2 as posted. Included is the new "ph.uue" (version 1.2.1) along with "phl.uue", "README" and "tap_demo". Change the sources as follows: File "pipecreate.c", line 102: PIPEKEY *pipekey; Change to: PIPEKEY *pipekey = NULL; Thanks to Mitsu (mitsuharu hadeishi) for reporting the bug: > Minor problem, however; I accidentally typed p: at the command line > and the system crashed. What should happen is "Unable to load p:: > Error code 212". Otherwise, a great thing! > > -Mitsu This reminds me of a novel use for pipes, reminiscent of "Mission Impossible". Copy an executable file to a pipe. Now, you can execute it ONCE. -Ed Puckett. # This is a shell archive. # Remove everything above and including the cut line. # Then run the rest of the file through sh. #----cut here-----cut here-----cut here-----cut here----# #!/bin/sh # shar: Shell Archiver # Run the following text with /bin/sh to create: # README # tap_demo # phl.uue # ph.uue # This archive created: Sat Jun 27 09:00:08 1987 cat << \SHAR_EOF > README README file for pipe-handler (version 1.2 13-Jun-87) ==================================================== This program and source are freely distributable, provided the file headers remain intact (i.e., my name is on them!!!). Ed Puckett accepts no responsibility for others' use of this program. ...but you shouldn't have any problems! WHAT IS THIS? ------------- Pipe-handler is an AmigaDOS device. It supports OPEN, CLOSE, READ and WRITE (of course), and also LOCK, EXAMINE, EXNEXT. Therefore, you can CD to the handler, use Dir and List on it, and ASSIGN to it as well as to individual pipes in it. Here is a complete list of the packet types it supports: MODE_READWRITE ACTION_FINDINPUT (syn: MODE_READONLY, MODE_OLDFILE) ACTION_FINDOUTPUT (syn: MODE_NEWFILE) ACTION_END ACTION_READ ACTION_WRITE ACTION_LOCATE_OBJECT ACTION_COPY_DIR ACTION_FREE_LOCK ACTION_EXAMINE_OBJECT ACTION_EXAMINE_NEXT ACTION_PARENT You cannot Seek() pipes nor can you create pipe subdirectories. INSTALLATION ------------ 1. Perform the following: <uudecode phl.uue to produce pipe-handler-l> <uudecode ph.uue to produce pipe-handler> Copy pipe-handler-l L:pipe-handler-loader Copy pipe-handler L:pipe-handler 2. Add to S:Startup-Sequence (do not include !'s - they denote start of line): !Mount P: !Dir >NIL: P: 3. Add to DEVS:Mountlist (do not include !'s - they denote start of line): !P: Handler = L:pipe-handler-loader ! Stacksize = 3000 ! Priority = 5 !# 4. Reboot NOTES ON INSTALLATION --------------------- * The handler, once installed, requires approximately 18k of memory. This memory cannot be reclaimed (unless you reboot and do not load the handler). Each pipe requires additional memory while it exists (its buffer size + about 100 bytes or so). * You can skip the reboot, and just perform the "Mount" and "Dir" from the startup-sequence manually. * After the "Dir", the pipe-handler is loaded into the system, and the files "L:pipe-handler-loader" and "L:pipe-handler" will not be accessed until the next reboot. This means you may remove them from L: if you want (until next reboot). I do this because I copy L: into Ram:. * TO CHANGE THE HANDLER NAME: change "P:" to whatever you want (e.g., "PIPE:") in the following 2 files: DEVS:Mountlist (1 occurrence) S:Startup-Sequence (2 occurrences) * Feel free to shorten or otherwise change the names "pipe-handler-loader" and "pipe-handler". Just be sure to reflect those changes in "S:Startup-Sequence" and "DEVS:Mountlist". TAPS ---- The handler also supports "taps". These are essentially tees off of the pipe, and can specify any destination to which a copy of the pipe's stream is to be sent. One interesting application of this is tapping to a CON: window; you can then see what is going through the pipe, and you can also stop pipe throughput by typing a character into this window. Taps can also be other pipes. For an interesting demo of taps, EXECUTE the file "tap_demo". All pipe I/O is asynchronous, so you will not be able to lock up the handler by stopping one of its pipes. A single reader / single writer discipline in enforced. Pipe buffers are dynamically allocated. A pipe is removed from memory when all openers have closed it and it is empty. The size of a pipe buffer may be specified as part of its name. Otherwise, pipe buffers have a default size of 4096 bytes. Pipes behave in most respects like ordinary files. Some differences follow: Pipes block for writing (i.e., the write request is suspended) when the pipe's buffer is full, and block for reading when the pipe's buffer is empty. Thus, pipes are sort of like bounded ram: files. EOF is returned for reading when the pipe's buffer is empty and no process has the pipe open for writing. NAME SYNTAX ----------- In addition to the pipe's identifier, its name can specify its size and a tap. The syntax is name[/size][/[tapname]] where the parts enclosed in "[]" are optional. The size must begin with a digit in the range 0-9. If first digit is not "0", the size is interpreted as decimal. If the size begins with "0x", it is interpreted as hexadecimal. Otherwise, if the size begins with "0" but not "0x", it is interpreted as octal. If an empty tapname is specified, the default tap CON:10/15/300/70/name is used (where "name" is the pipe's name given). EXAMPLES OF PIPE NAMES ---------------------- The following assume that the pipe-handler is mounted as device P: P:x Opens a pipe named "x" with buffer size 4096 P:x/100 Opens a pipe named "x" with buffer size 100 P:hold/ Opens a pipe named "hold" with buffer size 4096, and also opens a window which displays the data which passes through the pipe. P:xyzzy/plugh Opens a pipe named "xyzzy" with buffer size 4096, and also directs the data passing through into the file "plugh". (Note that taps may be specified without specifying a size.) P:thru/0x40/ram:thru-log Opens a pipe named "thru" with buffer size 64 (decimal), and also directs the data passing through the pipe into the file "ram:thru-log". WHAT IS THIS SILLY "LOADER" FILE? --------------------------------- According to _The_AmigaDOS_Manual_ (Bantam Books, Feb 1986), page 291: If you write your device handler in C, you cannot use the automatic load and process creation provided by the kernel. In this case you must load the code yourself . . . . Well, I know others have gotten around this, and I did, too. The "prelude" version of the handler (see the Makefile) does it all with one file. However, I noticed that doing it this way, the handler would take about 3 seconds to "Mount" (after first access to it). This made me very nervous - visions of wild linking through memory, etc. The loader version mounts almost immediately. Anyway, due to my (possibly unfounded) paranoia, I instead use the BCPL-like assembly module "pipe-handler-loader" which LoadSeg()'s pipe-handler. There are undoubtedly better ways of handling this, but this works and, for me, it is not too annoying to put up with the extra file. COMPILATION ----------- The supplied C source files were compiled with Lattice v3.03. The assembly programs were assembled using the Commodore Assembler. See the Makefile for information on creating a debugging version (this puts up a window and tells you what packets are received by the handler - fun!). Basically, you just compile with a -DDEBUG option and link in the debugging modules. The Makefile will make either a "prelude" version (no "loader file) or a "loader" version (the default). I use an EXECUTE file "cc" to driver the compiler. It is supplied. INQUIRIES / COMMENTS / SUGGESTIONS ---------------------------------- Ed Puckett US Mail: MIT Branch PO - PO Box 61 Cambridge, MA 02139 E Mail: ...!ihnp4!mit-eddie!mit-oz!qix SHAR_EOF cat << \SHAR_EOF > tap_demo dir >P:a/P:b/P:c/P:d/CON:0/0/400/100/a->b->c->d list P: dir >P:a/CON:10/10/100/50/a list P: dir >P:b/CON:20/20/100/50/b list P: dir >P:c/CON:30/30/100/50/c list P: dir >P:d/CON:40/40/100/50/d list P: type P:a list P: type P:b list P: type P:c list P: type P:d list P: SHAR_EOF cat << \SHAR_EOF > phl.uue begin 777 pipe-handler-l M #\P ! R #Z0 #( RG_P 0Y8DO M00 0J\ !$/Z (9"@"QX 1.KOW8+T "&8 XO? 'H !& %A#^@!P M(@DL;P (3J[_:B] QF .+WP #- 1@ J0_H /B*/("\ #.6(($ @ M+P +P!.J $+GH )B(O PL;P (3J[_9")O @L> $3J[^8B O 3?_ M !!.=0 !D;W,N;&EB<F%R>0!,.G!I<&4M:&%N9&QE<@ $ + $ 0 _(N end SHAR_EOF cat << \SHAR_EOF > ph.uue begin 777 pipe-handler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