I am looking for the POSIX standard which describes the system call
interface. Is POSIX.1 the only and most recent standard describing
POSIX syscalls? I checked http://webstore.ansi.org/ and found
various POSIX standards, most of which are considerably more
expensive than the C and C++ standards. It seems like the
documents of interest are the four ISO/IEC 9945 documents
from 2002, especially Parts 1 and 2 available for USD50 each.
There are also older more expensive documents. What is the
difference between the verious POSIX documents? Do the ISO/IEC
9945 2002 POSIX documents outdate others like DIN EN 29945-1?