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According to the docs on opegroup.org, the function can return EINVAL if: The len argument is less than zero, or the offset argument is less than zero, or the underlying file system does not support this operation. I'd say it's a peculiar choice (when EONOTSUPP is right there), but let's keep POSIX happy for now. This was independently discovered by Mark Millard (on FreeBSD/ZFS). Quickly ack'ed by Rui on IRC. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317535 91177308-0d34-0410-b5e6-96231b3b80d8
llvm/lib/Support/Unix README =========================== This directory provides implementations of the lib/System classes that are common to two or more variants of UNIX. For example, the directory structure underneath this directory could look like this: Unix - only code that is truly generic to all UNIX platforms Posix - code that is specific to Posix variants of UNIX SUS - code that is specific to the Single Unix Specification SysV - code that is specific to System V variants of UNIX As a rule, only those directories actually needing to be created should be created. Also, further subdirectories could be created to reflect versions of the various standards. For example, under SUS there could be v1, v2, and v3 subdirectories to reflect the three major versions of SUS.