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Top Forums UNIX for Advanced & Expert Users O argv, argv, wherefore art thou argv? Post 302804657 by Don Cragun on Thursday 9th of May 2013 04:20:13 AM
Old 05-09-2013
I have a vague recollection of the address space layout shifting a few times with changes in CPU architectures. First there was the IBM 360 architecture, then the 16-bit address space PDP-11, then the 17-bit address space PDP-11, then the VAX, then the 3B20, 3B2, 3B5, M68K, SPARC, PA RISC, etc., and the segmented address space of the various x86 and similar processors. The people that did the ports to each new architecture decided at that time where code, text, heap, and stack would be placed for that architecture. For various reasons, they were not all in the same order. But, once an order was chosen for a particular processor type, ABI considerations tended to use the same layout for all systems based on that architecture. (Some companies (e.g., Intel) caused some unnecessary incompatibilities by not letting various contractors working on different OSes for the same architecture talk to each other and giving different answers to trivial questions like whether some numbers were presented in decimal or octal in tables that Intel created and then shared with the contractors.)
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machid(1)							   User Commands							 machid(1)

NAME
machid, sun, iAPX286, i286, i386, i486, i860, pdp11, sparc, u3b, u3b2, u3b5, u3b15, vax, u370 - get processor type truth value SYNOPSIS
sun iAPX286 i386 pdp11 sparc u3b u3b2 u3b5 u3b15 vax u370 DESCRIPTION
The following commands will return a true value (exit code of 0) if you are using an instruction set that the command name indicates. sun True if you are on a Sun system. iAPX286 True if you are on a computer using an iAPX286 processor. i386 True if you are on a computer using an iAPX386 processor. pdp11 True if you are on a PDP-11/45tm or PDP-11/70tm. sparc True if you are on a computer using a SPARC-family processor. u3b True if you are on a 3B20 computer. u3b2 True if you are on a 3B2 computer. u3b5 True if you are on a 3B5 computer. u3b15 True if you are on a 3B15 computer. vax True if you are on a VAX-11/750tm or VAX-11/780tm. u370 True if you are on an IBM(R) System/370tm computer. The commands that do not apply will return a false (non-zero) value. These commands are often used within makefiles (see make(1S)) and shell scripts (see sh(1)) to increase portability. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
make(1S), sh(1), test(1), true(1), uname(1), attributes(5) NOTES
The machid family of commands is obsolete. Use uname -p and uname -m instead. SunOS 5.11 5 Jul 1990 machid(1)
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