author | martin.trojer@nokia.com |
Fri, 31 Jul 2009 15:01:17 +0100 | |
changeset 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
1
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1 |
IBM VisualAge C/C++ for OS/2 |
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============================ |
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To build Python for OS/2, change into ./os2vacpp and issue an 'NMAKE' |
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command. This will build a PYTHON15.DLL containing the set of Python |
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modules listed in config.c and a small PYTHON.EXE to start the |
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interpreter. |
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By changing the C compiler flag /Gd- in the makefile to /Gd+, you can |
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reduce the size of these by causing Python to dynamically link to the |
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C runtime DLLs instead of including their bulk in your binaries. |
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However, this means that any system on which you run Python must have |
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the VAC++ compiler installed in order to have those DLLs available. |
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During the build process you may see a couple of harmless warnings: |
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From the C Compiler, "No function prototype given for XXX", which |
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comes from the use of K&R parameters within Python for portability. |
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From the ILIB librarian, "Module Not Found (XXX)", which comes |
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from its attempt to perform the (-+) operation, which removes and |
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then adds a .OBJ to the library. The first time a build is done, |
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it obviously cannot remove what is not yet built. |
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This build includes support for most Python functionality as well as |
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TCP/IP sockets. It omits the Posix ability to 'fork' a process but |
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supports threads using OS/2 native capabilities. I have tried to |
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support everything possible but here are a few usage notes. |
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-- os.popen() Usage Warnings |
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With respect to my implementation of popen() under OS/2: |
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import os |
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fd = os.popen("pkzip.exe -@ junk.zip", 'wb') |
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fd.write("file1.txt\n") |
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fd.write("file2.txt\n") |
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fd.write("file3.txt\n") |
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fd.write("\x1a") # Should Not Be Necessary But Is |
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fd.close() |
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There is a bug, either in the VAC++ compiler or OS/2 itself, where the |
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simple closure of the write-side of a pipe -to- a process does not |
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send an EOF to that process. I find I must explicitly write a |
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control-Z (EOF) before closing the pipe. This is not a problem when |
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using popen() in read mode. |
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One other slight difference with my popen() is that I return None |
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from the close(), instead of the Unix convention of the return code |
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of the spawned program. I could find no easy way to do this under |
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OS/2. |
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-- BEGINLIBPATH/ENDLIBPATH |
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With respect to environment variables, this OS/2 port supports the |
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special-to-OS/2 magic names of 'BEGINLIBPATH' and 'ENDLIBPATH' to |
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control where to load conventional DLLs from. Those names are |
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intercepted and converted to calls on the OS/2 kernel APIs and |
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are inherited by child processes, whether Python-based or not. |
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A few new attributes have been added to the os module: |
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os.meminstalled # Count of Bytes of RAM Installed on Machine |
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os.memkernel # Count of Bytes of RAM Reserved (Non-Swappable) |
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os.memvirtual # Count of Bytes of Virtual RAM Possible |
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os.timeslice # Duration of Scheduler Timeslice, in Milliseconds |
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os.maxpathlen # Maximum Length of a Path Specification, in chars |
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os.maxnamelen # Maximum Length of a Single Dir/File Name, in chars |
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os.version # Version of OS/2 Being Run e.g. "4.00" |
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os.revision # Revision of OS/2 Being Run (usually zero) |
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os.bootdrive # Drive that System Booted From e.g. "C:" |
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# (useful to find the CONFIG.SYS used to boot with) |
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-- Using Python as the Default OS/2 Batch Language |
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Note that OS/2 supports the Unix technique of putting the special |
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comment line at the time of scripts e.g. "#!/usr/bin/python" in |
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a different syntactic form. To do this, put your script into a file |
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with a .CMD extension and added 'extproc' to the top as follows: |
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extproc C:\Python\Python.exe -x |
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import os |
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print "Hello from Python" |
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The '-x' option tells Python to skip the first line of the file |
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while processing the rest as normal Python source. |
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-- Suggested Environment Variable Setup |
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With respect to the environment variables for Python, I use the |
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following setup: |
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Set PYTHONHOME=E:\Tau\Projects\Python;D:\DLLs |
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Set PYTHONPATH=.;E:\Tau\Projects\Python\Lib; \ |
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E:\Tau\Projects\Python\Lib\plat-win |
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The EXEC_PREFIX (optional second pathspec on PYTHONHOME) is where |
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you put any Python extension DLLs you may create/obtain. There |
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are none provided with this release. |
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106 |
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107 |
-- Contact Info |
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108 |
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109 |
Jeff Rush is no longer supporting the VACPP port :-( |
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110 |
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I don't have the VACPP compiler, so can't reliably maintain this port. |
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112 |
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Anyone with VACPP who can contribute patches to keep this port buildable |
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should upload them to the Python Patch Manager at Sourceforge and |
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115 |
assign them to me for review/checkin. |
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116 |
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117 |
Andrew MacIntyre |
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118 |
aimacintyre at users.sourceforge.net |
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August 18, 2002. |