Add '-s' option to simply display the number of bytes available for the rdroot
filesystem in the specified kernel.

No behaviour change to existing uses of rdsetroot.

Improved option handling & ok k

Add '-s' option to simply display the number of bytes available for the rdroot
filesystem in the specified kernel.

No behaviour change to existing uses of rdsetroot.

Improved option handling & ok kn@

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Sync usage with SYNOPSIS, mention that -x may use stdout

Feedback from jmc and Crystal Kolipe
OK jmc

For open/openat, if the flags parameter does not contain O_CREAT, the
3rd (variadic) mode_t parameter is irrelevant. Many developers in the past
have passed mode_t (0, 044, 0644, or such), which mig

For open/openat, if the flags parameter does not contain O_CREAT, the
3rd (variadic) mode_t parameter is irrelevant. Many developers in the past
have passed mode_t (0, 044, 0644, or such), which might lead future people
to copy this broken idiom, and perhaps even believe this parameter has some
meaning or implication or application. Delete them all.
This comes out of a conversation where tb@ noticed that a strange (but
intentional) pledge behaviour is to always knock-out high-bits from
mode_t on a number of system calls as a safety factor, and his bewilderment
that this appeared to be happening against valid modes (at least visually),
but no sorry, they are all irrelevant junk. They could all be 0xdeafbeef.
ok millert

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Rewrite using libelf(3).

Lots of help with build/tests on sparc64 from jsg@, thank you.
ok deraadt

take elfrdsetroot, clean it up for regular usage, and make it a full
citizen of base.
push from benno, ok mortimer ingo others