(libc.info.gz) XPG

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(libc.info.gz) SVID

(libc.info.gz) Standards and Portability

 
 1.2.5 XPG (The X/Open Portability Guide)
 ----------------------------------------
 
 The X/Open Portability Guide, published by the X/Open Company, Ltd., is
 a more general standard than POSIX. X/Open owns the Unix copyright and
 the XPG specifies the requirements for systems which are intended to be
 a Unix system.
 
    The GNU C Library complies to the X/Open Portability Guide, Issue
 4.2, with all extensions common to XSI (X/Open System Interface)
 compliant systems and also all X/Open UNIX extensions.
 
    The additions on top of POSIX are mainly derived from functionality
 available in System V and BSD systems.  Some of the really bad mistakes
 in System V systems were corrected, though.  Since fulfilling the XPG
 standard with the Unix extensions is a precondition for getting the Unix
 brand chances are good that the functionality is available on commercial
 systems.
 

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(libc.info.gz) SVID

(libc.info.gz) Standards and Portability