Add os390.c and z/OS startup code #23715
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tonycoz
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Sep 17, 2025
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Otherwise looks good to me |
z/OS has extra startup needs like a couple other platforms, e.g. cygwin. This adds a file that handles them. Principally, z/OS files have extra status fields regarding "tags". Files on this system may be encoded in different character sets, and these fields describe them. Hence the OS has within it the knowledge of a file's encoding. A file is "tagged" as being in a particular encoding (or encodings plural; I have no idea how that works). This file adds a function to deal with them.
The previous commit added a file and functions for specially dealing with z/OS. This commit actually calls the start up one.
z/OS has extra fields which give the character set associated with the object. Previously, there were a bunch of functions called to deal with these. This all falls away if we #ifdef these fields when accessing the structure.
IBM has an initiative underway to port various open source projects to work on z/OS, running under ASCII. But its native character set is IBM 1047. This requires a bunch of fancy footwork that they have undertaken. One of the necessary things is to be able to set the character set of a file descriptor. The __setfdccsid() function does that, but it and its header file, zos.h, are only defined in ASCII builds. This commit allows perl to work in both modes.
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z/OS has extra startup needs like a couple other platforms, e.g. cygwin.
This series of commits, mostly from IBM, adds z/OS startup code
Principally, z/OS files have extra status fields regarding "tags".
Files on this system may be encoded in different character sets, and
these fields describe them. Hence the OS has within it the knowledge of
a file's encoding. A file is "tagged" as being in a particular encoding
(or encodings plural; I have no idea how that works).